MAX220/MAX232/MAX232A

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1 -Powered, Multichannel General Description The MAX0 MAX family of line drivers/receivers is intended for all EIA/TIA-E and V./V. communications interfaces, particularly applications where ±V is not available. The MAX, MAX, MAX, and MAX/MAX/ MAX use no external components and are recommended for applications where printed circuit board space is critical. The MAX0-MAX are offered in different packages with temperatures from 0 to 0 C up to - C to C. See ordering information table at the end of the data sheet for all package and temperature options. Applications Interface Translation Multidrop RS- Networks Portable Diagnostics Equipment Benefits and Features Saves Board Space Integrated Charge Pump Circuitry Eliminates the Need for a Bipolar ±V Supply Enables Single Supply Operation from Supply Integrated Capacitors (MAX, MAX, MAX, MAX-MAX) Saves Power for Reduced Power Requirements µw Shutdown Mode Ordering Information and Selection Table appears at end of data sheet. AutoShutdown and UCSP are trademarks of Maxim Integrated Products, Inc. MAX0/MAX/MAXA Pin Configuration and Typical Operating Circuit MAX0 MAX MAXA TOUT RIN ROUT TIN TIN ROUT C C INPUT C C- TOUT RIN C V CC V TO V VOLTAGE DOUBLER C V TO -V -V C- VOLTAGE INVERTER C TIN TOUT RS- TIN TOUT C DIP/SO ROUT RIN DEVICE MAX0 MAX MAXA CAPACITANCE (μf) C C C C C ROUT RIN RS- -; Rev ; /

2 -Powered, Multichannel Absolute Maximum Ratings MAX0//A/A// (Voltages referenced to.)...-0.v to V (Note )...( - 0.V) to V (Note )...0.V to -V Input Voltages TIN...-0.V to ( - 0.V) RIN (Except MAX0)...±0V RIN (MAX0)...±V TOUT (Except MAX0) (Note )...±V TOUT (MAX0)...±.V Output Voltages TOUT...±V ROUT...-0.V to ( 0.V) Driver/Receiver Output Short Circuited to...continuous Continuous Power Dissipation (T A = 0 C) -Pin Plastic DIP (derate.mw/ C above 0 C)..mW -Pin Plastic DIP (derate.mw/ C above 0 C)..mW 0-Pin Plastic DIP (derate.00mw/ C above 0 C)..0mW Note : For the MAX0, and can have a maximum magnitude of V, but their absolute difference cannot exceed V. Note : Input voltage measured with TOUT in high-impedance state, V SHDN or = 0V. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics MAX0//A/A// ( = ±%, C C = 0.µF MAX0, C = 0.0µF, C C = 0.µF, T A = T MIN to T MAX unless otherwise noted.) (Note ) RS- TRANSMITTERS -Pin Narrow SO (derate.0mw/ C above 0 C)...mW -Pin Wide SO (derate.mw/ C above 0 C)...mW -Pin Wide SO (derate.mw/ C above 0 C)...mW 0-Pin Wide SO (derate.00mw/ C above 0 C)...00mW 0-Pin SSOP (derate.00mw/ C above 0 C)...0mW -Pin CERDIP (derate.00mw/ C above 0 C)...00mW -Pin CERDIP (derate.mw/ C above 0 C)...mW Operating Temperature Ranges MAX AC, MAX C...0 C to 0 C MAX AE, MAX E...-0 C to C MAX AM, MAX M...- C to C Storage Temperature Range...- C to 0 C Lead Temperature (soldering, s)...00 C Soldering Temperature (reflow) 0 PDIP (P0M)... C All other lead(pb)-free packages...0 C All other packages containing lead(pb)...0 C PARAMETER CONDITIONS MIN TYP MAX UNITS Output Voltage Swing All transmitter outputs loaded with k to ± ± V Input Logic-Low Voltage. 0. V Input Logic-High Voltage Logic Pullup/lnput Current Output Leakage Current All devices except MAX0. MAX0: =.0V. All except MAX0, normal operation 0 V SHDN = 0V, MAX/MAX, shutdown, MAX0 =.V, V SHDN = 0V, V OUT = ±V, MAX/MAX = V SHDN = 0V ±0.0 ± ±0.0 ± V OUT = ±V ±0.0 ± MAX0, V OUT = ±V ± Data Rate 00 kbps Transmitter Output Resistance = = = 0V, V OUT = ±V 00 M Output Short-Circuit Current RS- RECEIVERS RS- Input Voltage Operating Range V OUT = 0V RS- Input Threshold Low = RS- Input Threshold High = V OUT = 0V ± ± MAX0 ±0 ±0 MAX0 ± All except MAX RIN 0.. MAX RIN (Note ) - All except MAX RIN.. MAX RIN (Note ) V μa μa ma V V V Maxim Integrated

3 -Powered, Multichannel Electrical Characteristics MAX0//A/A// (continued) ( = ±%, C C = 0.µF MAX0, C = 0.0µF, C C = 0.µF, T A = T MIN to T MAX unless otherwise noted.) (Note ) RS- Input Hysteresis RS- Input Resistance PARAMETER CONDITIONS MIN TYP MAX UNITS Output Voltage Low All except MAX0/MAX, =, no hysteresis in shutdown MAX0 0. MAX T A = C (MAX0) I OUT =.ma I OUT =.ma (MAX0) 0. Output Voltage High I OUT = -.0mA V Output Short-Circuit Current Output Leakage Current Sourcing V OUT = V - - Sinking V OUT = 0 V SHDN = or V EN = (V SHDN = 0V for MAX), 0V V OUT ±0.0 ± μa EN Input Threshold Low MAX. 0. V EN Input Threshold High MAX.0. V Supply Voltage Range.. V Supply Current (V SHDN = ), Figures,,, Shutdown Supply Current No load k load both inputs MAX/ MAX MAX0 0. MAX/MAXA/MAXA/ MAX/MAX MAX0 MAX/MAXA/MAXA/ MAX/MAX T A = C 0. T A = 0 C to 0 C 0 T A = -0 C to C 0 T A = - C to C 0 SHDN Input Leakage Current MAX/MAX ± μa SHDN Threshold Low MAX/MAX. 0. V SHDN Threshold High MAX/MAX.0. V Transition Slew Rate Transmitter Propagation Delay TLL to RS- (Normal Operation) C L = 0pF to 00pF, R L = k to k, =, T A = C, measured from V to -V or -V to V t PHLT, Figure t PLHT, Figure MAX/MAXA/ MAX/MAX/MAX 0 MAX MAX/MAXA/ MAX/MAX/MAX.. MAX0 MAX/MAXA/ MAX/MAX/MAX.. MAX0 V k V ma ma μa V/μs μs Maxim Integrated

4 -Powered, Multichannel Electrical Characteristics MAX0//A/A// (continued) ( = ±%, C C = 0.µF MAX0, C = 0.0µF, C C = 0.µF, T A = T MIN to T MAX unless otherwise noted.) (Note ) PARAMETER CONDITIONS MIN TYP MAX UNITS Receiver Propagation Delay RS- to TLL (Normal Operation) t PHLR, Figure t PLHR, Figure MAX/MAXA/MAX/ MAX/MAX 0. MAX0 0. MAX/MAXA/MAX/ MAX/MAX 0. MAX0 0. Receiver Propagation Delay RS- to t PHLS, Figure MAX 0. TLL (Shutdown) t PHLS, Figure MAX. μs Receiver-Output Enable Time t ER MAX, Figure 00 ns Receiver-Output Disable Time t DR MAX, Figure 0 00 ns Transmitter-Output Enable Time (SHDN Goes High) Transmitter-Output Disable Time (SHDN Goes Low) Transmitter to - Propagation Delay Difference (Normal Operation) t ET t DT MAX/MAX, 0.μF caps (includes charge-pump start-up), Figure MAX/MAX, 0.μF caps, Figure t PHLT - t PLHT MAX/MAXA/MAX/ MAX/MAX 00 MAX0 000 μs 0 μs 00 ns ns Receiver to - Propagation Delay Difference (Normal Operation) t PHLR - t PLHR MAX/MAXA/MAX/ MAX/MAX 0 MAX0 ns Note : All units are production tested at hot. Specifications over temperature are guaranteed by design. Note : MAX ROUT is guaranteed to be low when RIN 0V or is unconnected. Typical Operating Characteristics MAX0/MAX/MAXA/MAXA/MAX/MAX OUTPUT VOLTAGE (V) OUTPUT VOLTAGE vs. LOAD CURRENT EITHER OR LOADED = NO LOAD ON TRANSMITTER (EXCEPT MAX0, MAXA) LOADED, NO LOAD ON 0.μF μf 0.μF μf LOADED, NO LOAD ON 0 0 LOAD CURRENT (ma) MAX0-0 OUTPUT CURRENT (ma) AVAILABLE OUTPUT CURRENT vs. DATA RATE ALL CAPS μf ALL CAPS 0.μF OUTPUT LOAD CURRENT FLOWS FROM TO =.V =.V DATA RATE (kb/s) MAX0-0, VOLTAGE (V) V 0V 0V -V MAX/MAX ON-TIME EXITING SHUTDOWN SHDN 0.μF CAPS μf CAPS μf CAPS 0.μF CAPS 00μs/div MAX0-0 Maxim Integrated

5 -Powered, Multichannel Absolute Maximum Ratings MAX/MAX0 MAX (Voltages referenced to.)...-0.v to V...( - 0.V) to V...0.V to -V Input Voltages TIN...-0.V to ( 0.V) RIN...±0V Output Voltages TOUT...( 0.V) to ( - 0.V) ROUT...-0.V to ( 0.V) Short-Circuit Duration, TOUT to...continuous Continuous Power Dissipation (T A = 0 C) -Pin Plastic DIP (derate.00mw/ C above 0 C)...00mW -Pin Plastic DIP (derate.mw/ C above 0 C)...mW 0-Pin Plastic DIP (derate.mw/ C above 0 C)...mW -Pin Narrow Plastic DIP (derate.mw/ C above 0 C)...0W -Pin Plastic DIP (derate.0mw/ C above 0 C)...00mW -Pin Wide SO (derate.mw/ C above 0 C)...mW 0-Pin Wide SO (derate.00mw/ C above 0 C)...00mW -Pin Wide SO (derate.mw/ C above 0 C)...mW -Pin Wide SO (derate.0mw/ C above 0 C)...W -Pin Plastic FP (derate.mw/ C above 0 C)...mW -Pin CERDIP (derate.0mw/ C above 0 C)...mW -Pin CERDIP (derate.00mw/ C above 0 C)...00mW 0-Pin CERDIP (derate.mw/ C above 0 C)...mW -Pin Narrow CERDIP (derate.0mw/ C above 0 C)...W -Pin Sidebraze (derate 0.0mW/ C above 0 C)...W -Pin SSOP (derate.mw/ C above 0 C)...mW Operating Temperature Ranges MAX C...0 C to 0 C MAX E...-0 C to C MAX M...- C to C Storage Temperature Range...- C to 0 C Lead Temperature (soldering, s)...00 C Soldering Temperature (reflow) 0 PDIP (P0M)... C PDIP (PM-)... C All other lead(pb)-free packages...0 C All other packages containing lead(pb)...0 C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics MAX/MAX0 MAX (MAX/0//////0/, = ±%; MAX/MAX, = ±% C C =.0µF; MAX/MAX, = ±%; =.V to.v; T A = T MIN to T MAX ; unless otherwise noted.) (Note ) PARAMETER CONDITIONS MIN TYP MAX UNITS Output Voltage Swing All transmitter outputs loaded with kω to ground ±.0 ±. V MAX/ Supply Current No load, T A = C MAX/0/ /0/ ma MAX/ 0. Supply Current MAX. MAX ma Shutdown Supply Current T A = C MAX 0 MAX0///0/ µa Input Logic-Low Voltage TIN, EN, SHDN (MAX); EN, SHDN (MAX0/ ) 0. V TIN.0 Input Logic-High Voltage EN, SHDN (MAX); V. EN, SHDN (MAX0///0/) Logic Pullup Current V TIN =0V. 00 µa Receiver Input Voltage Operating Range -0 0 V Maxim Integrated

6 -Powered, Multichannel Electrical Characteristics MAX/MAX0 MAX (continued) (MAX/0//////0/, = ±%; MAX/MAX, = ±% C C =.0µF; MAX/MAX, = ±%; =.V to.v; T A = T MIN to T MAX ; unless otherwise noted.) (Note ) PARAMETER CONDITIONS MIN TYP MAX UNITS RS- Input Logic-Low Voltage RS- Input Logic-High Voltage T A = C, = T A = C, = Normal operation V SHDN = (MAX) V SHDN = 0V (MAX//0/) Shutdown (MAX) V SHDN = 0V, V EN = (RIN, RIN) Normal operation V SHDN = V (MAX) V SHDN = 0V (MAX//0/) Shutdown (MAX) V SHDN = 0V, V EN = (RIN RIN) RS- Input Hysteresis =, no hysteresis in shutdown V RS- Input Resistance T A = C, = kω Output Voltage Low I OUT =.ma (MAX//, I OUT =.ma) 0. V Output Voltage High I OUT = -ma V Output Leakage Current Receiver Output Enable Time 0V R OUT ; V EN = 0V (MAX); V EN = (MAX ) Normal MAX 00 operation MAX///0/ 00 V V ±0.0 ± µa ns Receiver Output Disable Time Normal MAX 00 operation MAX///0/ 0 ns Propagation Delay Transition Region Slew Rate RS- IN to OUT, C L = 0pF Normal operation 0. V SHDN = 0V (MAX) MAX/MAX/MAX, T A = C, =, R L = kω to kω, C L = 0pF to 00pF, measured from V to -V or -V to V Transmitter Output Resistance = = = 0V, V OUT = ±V 00 Ω Transmitter Output Short-Circuit Current t PHLS t PLHS MAX/MAX0/MAX, T A = C, =, R L = kω to kω C L = 0pF to 00pF, measured from V to -V or -V to V µs V/µs ± ma ma Note : All units are production tested at hot except for the MAX0, which is production tested at T A = C. Specifications over temperature are guaranteed by design. Maxim Integrated

7 -Powered, Multichannel Typical Operating Characteristics MAX/MAX0 MAX VOH (V) TRANSMITTER OUTPUT VOLTAGE (V OH ) vs. TRANSMITTER LOADED TRANSMITTERS LOADED TRANSMITTERS LOADED..0. (V) TRANS- MITTERS LOADED T A = C C C = μf TRANSMITTER LOADS = kω 00pF MAX0-0 VOH (V) TRANSMITTER OUTPUT VOLTAGE (V OH ) vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES 0kb/s 0kb/s 0kb/s T A = C = TRANSMITTERS LOADED R L = kω C C = μf LOAD CAPACITANCE (pf) MAX0-0 SLEW RATE (V/μs) TRANSMITTER SLEW RATE vs. LOAD CAPACITANCE TRANSMITTER LOADED TRANSMITTERS LOADED TRANSMITTERS LOADED T A = C = LOADED, R L = kω C C = μf TRANSMITTERS LOADED LOAD CAPACITANCE (pf) MAX0-0 VOL (V) TRANS- MITTER LOADED TRANS- MITTERS LOADED TRANSMITTER OUTPUT VOLTAGE (V OL ) vs. TRANS- MITTERS LOADED TRANS- MITTERS LOADED..0. (V) T A = C C C = μf TRANSMITTER LOADS = kω 00pF MAX0-0 VOL (V) TRANSMITTER OUTPUT VOLTAGE (V OL ) vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES T A = C = TRANSMITTERS LOADED R L = kω C C = μf 0kb/s 0kb/s 0kb/s LOAD CAPACITANCE (pf) MAX0-0, (V) TRANSMITTER OUTPUT VOLTAGE (, ) vs. LOAD CURRENT AND EQUALLY LOADED T A = C = C C = μf LOADED, NO LOAD ON LOADED, NO LOAD ON ALL TRANSMITTERS UNLOADED CURRENT (ma) MAX0-0, WHEN EXITING SHUTDOWN (μf CAPACITORS) MAX0- O V SHDN * 00ms/div *SHUTDOWN POLARITY IS REVERSED FOR NON MAX PARTS Maxim Integrated

8 -Powered, Multichannel Absolute Maximum Ratings MAX/MAX MAX (Voltages referenced to.) Supply Voltage ( )...-0.V to V Input Voltages TIN ENA, ENB, ENR, ENT, ENRA, ENRB, ENTA, ENTB...-0.V to ( 0.V) RIN...±V TOUT (Note )...±V ROUT...-0.V to ( 0.V) Short Circuit Duration (one output at a time) TOUT to...continuous ROUT to...continuous Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics MAX/MAX MAX (MAX, =.0V ±%; MAX MAX, =.0V ±%, external capacitors C C = µf; T A = T MIN to T MAX ; unless otherwise noted.) (Note ) PARAMETER RS- TRANSMITTERS Input Logic-Low Voltage Input Logic-High Voltage Data Rate Output Voltage Swing Output Leakage Current (Shutdown) Transmitter Output Resistance Output Short-Circuit Current RS- RECEIVERS RS- Input Voltage Operating Range RS- Input Logic-Low Voltage RS- Input Logic-High Voltage RS- Input Hysteresis RS- Input Resistance Output Voltage Low Output Voltage High Output Short-Circuit Current Output Leakage Current Normal operation Tables a d Shutdown Tables a d, normal operation All transmitter outputs loaded with kω to V ENA, V ENB, V ENT, V ENTA, V ENTB =, V OUT = ±V Tables a d = 0V, V OUT = ±V = = = 0V, V OUT = ±V (Note ) V OUT = 0V = = = I OUT =.ma I OUT = -.0mA Sourcing V OUT = V Sinking V OUT = Normal operation, outputs disabled, Tables a d, 0V V OUT, V ENR_ = Continuous Power Dissipation (T A = 0 C) -Pin Wide SO (derate.0mw/ C above 0 C)...W 0-Pin Plastic DIP (derate.mw/ C above 0 C)...mW -Pin PLCC (derate.mw/ C above 0 C)...0W Operating Temperature Ranges MAXC, MAX_C...0 C to 0 C MAXE, MAX_E...-0 C to C Storage Temperature Range...- C to 0 C Lead Temperature (soldering,s))...00 C Soldering Temperature (reflow) 0 PDIP (P0M-)... C All other lead(pb)-free packages...0 C All other packages containing lead(pb)...0 C Note : Input voltage measured with transmitter output in a high-impedance state, shutdown, or = 0V. Logic Pullup/lnput Current CONDITIONS MIN TYP MAX UNITS. 0. V. V 0 ±0.0 ± µa 0 kbps ± ±. V 00 M ± ±0 ±0.0 ± ±0.0 ± ± ±0.0 ±0. µa Ω ma V V V V kω V V ma µa Maxim Integrated

9 -Powered, Multichannel Electrical Characteristics MAX/MAX MAX (continued) (MAX, =.0V ±%; MAX MAX, =.0V ±%, external capacitors C C = µf; T A = T MIN to T MAX ; unless otherwise noted.) (Note ) PARAMETER POWER SUPPLY AND CONTROL LOGIC Supply Voltage Range.... MAX 0 No load Supply Current MAX MAX 0 ma (Normal Operation) kω loads on MAX 0 all outputs MAX MAX T A = C Shutdown Supply Current µa T A = T MIN to T MAX 0 Leakage current ± µa Control Input Logic-low voltage. 0. V Logic-high voltage.. AC CHARACTERISTICS Transition Slew Rate CONDITIONS MAX MAX MAX C L = 0pF to 00pF, R L = kω to kω, =, T A = C, measured from V to -V or -V to V MIN TYP MAX 0 UNITS V V/µs Transmitter Propagation Delay TLL to RS- (Normal Operation) Receiver Propagation Delay TLL to RS- (Normal Operation) Receiver Propagation Delay TLL to RS- (Low-Power Mode) t PHLT, Figure.. t PLHT, Figure.. t PHLR, Figure 0.. t PLHR, Figure 0.. t PHLS, Figure 0. t PLHS, Figure.0 µs µs µs Transmitter to - Propagation Delay Difference (Normal Operation) t PHLT - t PLHT 0 ns Receiver to - Propagation Delay Difference (Normal Operation) t PHLR - t PLHR 0 ns Receiver-Output Enable Time t ER, Figure 0 00 ns Receiver-Output Disable Time t DR, Figure 0 00 ns Transmitter Enable Time t ET MAX MAX (excludes charge-pump startup) MAX/MAX MAX (includes charge-pump startup) Transmitter Disable Time t DT, Figure 0 ns Note : All units production tested at hot. Specifications over temperature are guaranteed by design. Note : The 00Ω minimum specification complies with EIA/TIA-E, but the actual resistance when in shutdown mode or = 0V is MΩ as is implied by the leakage specification. µs ms Maxim Integrated

10 -Powered, Multichannel Typical Operating Characteristics MAX/MAX MAX TRANSMITTER SLEW RATE (V/μs) TRANSMITTER SLEW RATE vs. LOAD CAPACITANCE EXTERNAL POWER SUPPLY μf CAPACITORS = 0kb/s DATA RATE TRANSMITTERS LOADED WITH kω 0 LOAD CAPACITANCE (nf) MAX0- OUTPUT VOLTAGE (V) OUTPUT VOLTAGE vs. LOAD CURRENT FOR AND AND LOADED = EXTERNAL CHARGE PUMP μf CAPACITORS TRANSMITTERS DRIVING AND 000pF AT 0kb/s AND LOADED EITHER OR LOADED LOADED LOADED LOAD CURRENT (ma) MAX0-, (V) TRANSMITTER OUTPUT VOLTAGE (, ) vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES = WITH ALL TRANSMITTERS DRIVEN LOADED WITH kb/s 0kb/s 00kb/s ALL CAPACITIORS μf 0 LOAD CAPACITANCE (nf) 0kb/s 0kb/s 0kb/s MAX0- Maxim Integrated

11 -Powered, Multichannel Test Circuits/Timing Diagrams V V INPUT 0V* 0% 0% INPUT 0V OUTPUT 0% 0% OUTPUT 0V t PHLR t PHLS t PLHR t PLHS t PLHT t PHLT *EXCEPT FOR R ON THE MAX WHERE -V IS USED. Figure. Transmitter Propagation-Delay Timing Figure. Receiver Propagation-Delay Timing EN R X IN a) TEST CIRCUIT EN INPUT R X V R X OUT kω 0pF 0V - V EN SHDN V 0V OUTPUT DISABLE TIME (t DT ) OUTPUT ENABLE TIME (t ER ) 0V RECEIVER.V 0.V -V a) TIMING DIAGRAM b) ENABLE TIMING EN INPUT 0V V EN OR 0 T X V OH OUTPUT DISABLE TIME (t DR ) V OH - 0.V kω 0pF RECEIVER V OL V OL 0.V - V b) TEST CIRCUIT c) DISABLE TIMING Figure. Receiver-Output Enable and Disable Timing Figure. Transmitter-Output Disable Timing Maxim Integrated

12 -Powered, Multichannel Control Pin Configuration Tables Table a. MAX Control Pin Configurations ENT ENR OPERATION STATUS TRANSMITTERS RECEIVERS 0 0 Normal Operation All Active All Active 0 Normal Operation All Active All High-Z 0 Shutdown All High-Z All Low-Power Receive Mode Shutdown All High-Z All High-Z Table b. MAX Control Pin Configurations ENT ENR OPERATION STATUS TRANSMITTERS RECEIVERS TA TA TB TB RA RA RB RB 0 0 Normal Operation All Active All Active All Active All Active 0 Normal Operation All Active All Active 0 Shutdown All High-Z All High-Z Shutdown All High-Z All High-Z RA RA High-Z, RA Active All Low-Power Receive Mode RA RA High-Z, RA Low-Power Receive Mode RB RB High-Z, RB Active All Low-Power Receive Mode RB RB High-Z, RB Low-Power Receive Mode Table c. MAX Control Pin Configurations ENA ENB OPERATION STATUS TRANSMITTERS RECEIVERS TA TA TB TB RA RA RB RB 0 0 Normal Operation All Active All Active All Active All Active 0 Normal Operation All Active All High-Z All Active RB RB High-Z, RB Active 0 Shutdown All High-Z All Active Shutdown All High-Z All High-Z RA RA High-Z, RA Active RA RA High-Z, RA Low-Power Receive Mode All Active RB RB High-Z, RA Low-Power Receive Mode Maxim Integrated

13 -Powered, Multichannel Table d. MAX/MAX/MAX Control Pin Configurations ENTA ENTB ENRA ENRB OPERATION STATUS TRANSMITTERS RECEIVERS MAX TA TA TB TB RA RA RB RB MAX TA TA TB TB RA RA RB RB MAX TA TA TB TB RA RA RB RB Normal Operation All Active All Active All Active All Active Normal Operation All Active All Active All Active All High-Z, except RB stays active on MAX Normal Operation All Active All Active All High-Z All Active 0 0 Normal Operation All Active All Active All High-Z All High-Z, except RB stays active on MAX Normal Operation All Active All High-Z All Active All Active 0 0 Normal Operation All Active All High-Z All Active All High-Z, except RB stays active on MAX 0 0 Normal Operation All Active All High-Z All High-Z All Active 0 Normal Operation All Active All High-Z All High-Z All High-Z, except RB stays active on MAX Normal Operation All High-Z All Active All Active All Active 0 0 Normal Operation All High-Z All Active All Active All High-Z, except RB stays active on MAX 0 0 Normal Operation All High-Z All Active All High-Z All Active 0 Normal Operation All High-Z All Active All High-Z All High-Z, except RB stays active on MAX 0 0 Shutdown All High-Z All High-Z Low-Power Receive Mode Low-Power Receive Mode 0 Shutdown All High-Z All High-Z Low-Power Receive Mode All High-Z, except RB stays active on MAX 0 Shutdown All High-Z All High-Z All High-Z Low-Power Receive Mode Shutdown All High-Z All High-Z All High-Z All High-Z, except RB stays active on MAX Maxim Integrated

14 -Powered, Multichannel Detailed Description The MAX0 MAX contain four sections: dual charge-pump DC-DC voltage converters, RS- drivers, RS- receivers, and receiver and transmitter enable control inputs. Dual Charge-Pump Voltage Converter The MAX0 MAX have two internal charge-pumps that convert to ±V (unloaded) for RS- driver operation. The first converter uses capacitor C to double the input to V on C at the output. The second converter uses capacitor C to invert V to -V on C at the output. A small amount of power may be drawn from the V () and -V () outputs to power external circuitry (see the Typical Operating Characteristics section), except on the MAX and MAX MAX, where these pins are not available. and are not regulated, so the output voltage drops with increasing load current. Do not load and to a point that violates the minimum ±V EIA/TIA-E driver output voltage when sourcing current from and to external circuitry. When using the shutdown feature in the MAX, MAX, MAX0, MAX, MAX, MAX0, MAX, and MAX MAX, avoid using and to power external circuitry. When these parts are shut down, falls to 0V, and falls to. For applications where a V external supply is applied to the pin (instead of using the internal charge pump to generate V), the C capacitor must not be installed and the SHDN pin must be connected to VCC. This is because is internally connected to VCC in shutdown mode. RS- Drivers The typical driver output voltage swing is ±V when loaded with a nominal RS- receiver and =. Output swing is guaranteed to meet the EIA/TIA- E and V. specification, which calls for ±V minimum driver output levels under worst-case conditions. These include a minimum kω load, VCC =.V, and maximum operating temperature. Unloaded driver output voltage ranges from ( -.V) to ( 0.V). Input thresholds are both TTL and CMOS compatible. The inputs of unused drivers can be left unconnected since input pullup resistors to VCC are built in (except for the MAX0). The pullup resistors force the outputs of unused drivers low because all drivers invert. The internal input pullup resistors typically source µa, except in shutdown mode where the pullups are disabled. Driver outputs turn off and enter a high-impedance state where leakage current is typically microamperes (maximum µa) when in shutdown mode, in three-state mode, or when device power is removed. Outputs can be driven to ±V. The powersupply current typically drops to µa in shutdown mode. The MAX0 does not have pullup resistors to force the outputs of the unused drivers low. Connect unused inputs to or. The MAX has a receiver three-state control line, and the MAX, MAX, MAX, MAX, MAX0, and MAX have both a receiver three-state control line and a low-power shutdown control. Table shows the effects of the shutdown control and receiver threestate control on the receiver outputs. The receiver outputs are in a high-impedance, three-state mode whenever the three-state enable line is high (for the MAX/MAX/MAX/MAX MAX), and are also high-impedance whenever the shutdown control line is high. When in low-power shutdown mode, the driver outputs are turned off and their leakage current is less than µa with the driver output pulled to ground. The driver output leakage remains less than µa, even if the transmitter output is backdriven between 0V and ( V). Below -0.V, the transmitter is diode clamped to ground with kω series impedance. The transmitter is also zener clamped to approximately VCC V, with a series impedance of kω. The driver output slew rate is limited to less than 0V/µs as required by the EIA/TIA-E and V. specifications. Typical slew rates are V/µs unloaded and V/µs loaded with Ω and 00pF. RS- Receivers EIA/TIA-E and V. specifications define a voltage level greater than V as a logic 0, so all receivers invert. Input thresholds are set at 0.V and.v, so receivers respond to TTL level inputs as well as EIA/TIA-E and V. levels. Table. Three-State Control of Receivers PART SHDN SHDN EN EN(R) RECEIVERS MAX Low High High MAX MAX MAX MAX0 Low Low High X Low High Low High Low High X High Impedance Active High Impedance High Impedance Active High Impedance Active High Impedance Maxim Integrated

15 -Powered, Multichannel The receiver inputs withstand an input overvoltage up to ±V and provide input terminating resistors with nominal values. The receivers implement Type interpretation of the fault conditions of V. and EIA/TIA-E. The receiver input hysteresis is typically 0.V with a guaranteed minimum of 0.V. This produces clear output transitions with slow-moving input signals, even with moderate amounts of noise and ringing. The receiver propagation delay is typically 00ns and is independent of input swing direction. Low-Power Receive Mode The low-power receive mode feature of the MAX, MAX, and MAX MAX puts the IC into shutdown mode but still allows it to receive information. This is important for applications where systems are periodically awakened to look for activity. Using low-power receive mode, the system can still receive a signal that will activate it on command and prepare it for communication at faster data rates. This operation conserves system power. Negative Threshold MAX The MAX is pin compatible with the MAXA, differing only in that RS- cable fault protection is removed on one of the two receiver inputs. This means that control lines such as CTS and RTS can either be driven or left unconnected without interrupting communication. Different cables are not needed to interface with different pieces of equipment. The input threshold of the receiver without cable fault protection is -0.V rather than.v. Its output goes positive only if the input is connected to a control line that is actively driven negative. If not driven, it defaults to the 0 or OK to send state. Normally the MAX s other receiver (.V threshold) is used for the data line (TD or RD) while the negative threshold receiver is connected to the control line (DTR DTS CTS RTS, etc.). Other members of the RS- family implement the optional cable fault protection as specified by EIA/TIA- E specifications. This means a receiver output goes high whenever its input is driven negative left unconnected or shorted to ground. The high output tells the serial communications IC to stop sending data. To avoid this the control lines must either be driven or connected with jumpers to an appropriate positive voltage level. Shutdown MAX MAX On the MAX MAX MAX MAX0 and MAX all receivers are disabled during shutdown. On the MAX and MAX two receivers continue to operate in a reduced power mode when the chip is in shutdown. Under these conditions the propagation delay increases to about.µs for a high-to-low input transition. When in shutdown, the receiver acts as a CMOS inverter with no hysteresis. The MAX and MAX also have a receiver output enable input (EN for the MAX and EN for the MAX) that allows receiver output control independent of SHDN (SHDN for MAX). With all other devices SHDN (SHDN for MAX) also disables the receiver outputs. The MAX provides five transmitters and five receivers while the MAX provides ten receivers and eight transmitters. Both devices have separate receiver and transmitter-enable controls. The charge pumps turn off and the devices shut down when a logic high is applied to the ENT input. In this state, the supply current drops to less than µa and the receivers continue to operate in a low-power receive mode. Driver outputs enter a high-impedance state (three-state mode). On the MAX all five receivers are controlled by the ENR input. On the MAX eight of the receiver outputs are controlled by the ENR input while the remaining two receivers (RA and RB) are always active. RA RA and RB RB are put in a three-state mode when ENR is a logic high. Receiver and Transmitter Enable Control Inputs The MAX and MAX MAX feature transmitter and receiver enable controls. The receivers have three modes of operation: full-speed receive (normal active) three-state (disabled) and lowpower receive (enabled receivers continue to function at lower data rates). The receiver enable inputs control the full-speed receive and three-state modes. The transmitters have two modes of operation: full-speed transmit (normal active) and three-state (disabled). The transmitter enable inputs also control the shutdown mode. The device enters shutdown mode when all transmitters are disabled. Enabled receivers function in the low-power receive mode when in shutdown. Maxim Integrated

16 -Powered, Multichannel Tables a d define the control states. The MAX has no control pins and is not included in these tables. The MAX has ten receivers and eight drivers with two control pins, each controlling one side of the device. A logic high at the A-side control input (ENA) causes the four A-side receivers and drivers to go into a three-state mode. Similarly, the B-side control input (ENB) causes the four B-side drivers and receivers to go into a three-state mode. As in the MAX, one A- side and one B-side receiver (RA and RB) remain active at all times. The entire device is put into shutdown mode when both the A and B sides are disabled (ENA = ENB = ). The MAX provides nine receivers and eight drivers with four control pins. The ENRA and ENRB receiver enable inputs each control four receiver outputs. The ENTA and ENTB transmitter enable inputs each control four drivers. The ninth receiver (RB) is always active. The device enters shutdown mode with a logic high on both ENTA and ENTB. The MAX provides eight receivers and eight drivers with four control pins. The ENRA and ENRB receiver enable inputs each control four receiver outputs. The ENTA and ENTB transmitter enable inputs control four drivers each. This part does not have an always-active receiver. The device enters shutdown mode and transmitters go into a three-state mode with a logic high on both ENTA and ENTB. The MAX provides ten receivers and six drivers with four control pins. The ENRA and ENRB receiver enable inputs each control five receiver outputs. The ENTA and ENTB transmitter enable inputs control three drivers each. There is no always-active receiver. The device enters shutdown mode and transmitters go into a three-state mode with a logic high on both ENTA and ENTB. In shutdown mode, active receivers operate in a low-power receive mode at data rates up to 0kb/s. Applications Information Figures through show pin configurations and typical operating circuits. In applications that are sensitive to power-supply noise, VCC should be decoupled to ground with a capacitor of the same value as C and C connected as close as possible to the device. Maxim Integrated

17 -Powered, Multichannel MAX0 MAX MAXA TOUT RIN ROUT TIN TIN ROUT C C INPUT C C- TOUT RIN C V CC V TO V VOLTAGE DOUBLER C V TO -V -V C- VOLTAGE INVERTER C TIN TOUT RS- TIN TOUT C DIP/SO ROUT RIN DEVICE MAX0 MAX MAXA CAPACITANCE (μf) C C C C C ROUT RIN RS- Figure. MAX0/MAX/MAXA Pin Configuration and Typical Operating Circuit INPUT C ALL CAPACITORS = 0.μF C MAX MAX SHDN TOUT RIN ROUT TIN MAX MAX 0 SHDN TOUT RIN ROUT C C () EN C C- () EN C C- TOUT VCC TO V V VOLTAGE DOUBLER C V TO -V -V C- VOLTAGE INVERTER C TIN TIN (EXCEPT MAX0) TOUT (EXCEPT MAX0) TOUT RS- TOUT RIN TIN ROUT DIP/SO RIN ROUT SSOP TIN TIN ROUT ROUT RIN RIN RS- ( ) ARE FOR MAX ONLY. PIN NUMBERS IN TYPICAL OPERATING CIRCUIT ARE FOR DIP/SO PACKAGES ONLY. () EN SHDN Figure. MAX/MAX Pin Configurations and Typical Operating Circuit Maxim Integrated

18 -Powered, Multichannel 0.μF ENR ENR TIN TIN ROUT ROUT ROUT RIN RIN RIN MAX 0 ENT TIN TIN TIN ROUT ROUT RIN RIN TIN TIN TIN TIN TIN TOUT TOUT TOUT TOUT TOUT TOUT TOUT TOUT TOUT ENT TOUT TOUT TOUT ROUT RIN SO ROUT RIN MAX FUNCTIONAL DESCRIPTION RECEIVERS TRANSMITTERS CONTROL PINS RECEIVER ENABLE (ENR) TRANSMITTER ENABLE (ENT) ROUT ROUT ROUT RIN RIN RIN 0 PINS (ENR,,, TOUT) ARE INTERNALLY CONNECTED. CONNECT EITHER OR BOTH EXTERNALLY. TOUT IS A SINGLE DRIVER. ENR ENR Figure. MAX Pin Configuration and Typical Operating Circuit Maxim Integrated

19 -Powered, Multichannel INPUT TOUT TOUT TOUT RIN ROUT TIN TIN ROUT RIN MAX MAX 0 TOUT RIN ROUT SHDN (SHDN) EN (EN) RIN* ROUT* TIN TIN C C- TIN TOUT T TIN TOUT T TO V VOLTAGE DOUBLER V TO -V VOLTAGE INVERTER 0 TIN T TOUT TIN T TOUT RS- ROUT* RIN* ROUT R RIN C- Wide SO/ SSOP C LOGIC ROUT R RIN ROUT R RIN RS- ROUT R RIN *R AND R IN MAX REMAIN ACTIVE IN SHUTDOWN. NOTE: PIN LABELS IN ( ) ARE FOR MAX. ROUT R RIN SHDN EN (EN) (SHDN) Figure. MAX/MAX Pin Configuration and Typical Operating Circuit Maxim Integrated

20 -Powered, Multichannel INPUT MAX0 DIP/SO 0 x TOUT TIN SHDN TOUT TIN TIN C- C TOUT TOUT TOUT TIN TIN C C- TIN TIN TIN TIN TIN VCC TO V VOLTAGE DOUBLER V TO -V VOLTAGE INVERTER T T T T T TOUT TOUT TOUT TOUT TOUT 0 RS- SHDN Figure. MAX0 Pin Configuration and Typical Operating Circuit INPUT.V TO V C C- TOUT RIN ROUT TIN C MAX TOUT RIN ROUT TIN C- TOUT RIN ROUT TIN DIP MAX SO TOUT RIN ROUT TIN () V TO -V VOLTAGE CONVERTER () () TIN TOUT T TIN TOUT T () () ROUT RIN R ROUT R RIN () C RS- RS- PIN NUMBERS IN ( ) ARE FOR SO PACKAGE. () Figure. MAX Pin Configurations and Typical Operating Circuit Maxim Integrated 0