10/100/1000 Base-T Ethernet LAN Switch

Transcription

1 19-377; Rev 2; 8/7 1/1/1 Base-T Ethernet LAN Switch General Description The MAX89/MAX891/MAX892 high-speed analog switches meet the needs of 1/1/1 Base-T applications. These devices switch the signals from two interface transformers and connect the signals to a single 1/1/1 Base-T Ethernet PHY, simplifying docking station design and reducing manufacturing costs. The MAX89/MAX891/MAX892 can also route signals from a common interface transformer to two different boards in board-redundancy applications. The MAX89/MAX891/MAX892 switches provide an extremely low capacitance and on-resistance to meet Ethernet insertion and return-loss specifications. The MAX891/MAX892 feature one and three built-in LED switches, respectively. The MAX89/MAX891/MAX892 are available in space-saving 32- and 36-lead TQFN packages, significantly reducing the required PC board area. These devices operate over the - C to +8 C temperature range. Applications Notebooks and Docking Stations Servers and Routers with Ethernet Interfaces Board-Level Redundancy Protection SONET/SDH Signal Routing T3/E3 Redundancy Protection Video Switching Features Single +3.V to +3.6V Power-Supply Voltage Low On-Resistance (R ON ): Ω (typ), 6.Ω (max) Ultra-Low On-Capacitance (C ON ): 6.pF (typ) Low < 2ps Bit-to-Bit Skew -3dB Bandwidth: 1GHz Optimized Pin-Out for Easy Transformer and PHY Interface Built-In LED Switches for Switching Indicators to Docking Station Low µa (max) Quiescent Current Bidirectional 8 to 16 Multiplexer/Demultiplexer Space-Saving Packages 32-Pin, mm x mm, TQFN Package 36-Pin, 6mm x 6mm, TQFN Package Ordering Information PART PIN-PACKAGE LED SWITCHES MAX89ETJ 32 TQFN-EP* MAX891ETJ 32 TQFN-EP* 1 MAX892ETX 36 TQFN-EP* 3 Note: All devices are specified for operation in the - C to +8 C temperature range. *EP = Exposed pad. Pin Configurations MAX89/MAX891/MAX892 TOP VIEW A1 A V+ B1 1B1 B2 1B A B1 A N.C B2 N.C. 21 3B2 N.C. MAX89 2 B1 N.C B1 A 7 *EP 18 B2 A 8 17 B A6 A7 GND N.C. 7B2 6B2 7B1 6B1 Functional Diagrams and Typical Operating Circuit appear at end of data sheet. TQFN *EP = EXPOSED PAD. CONNECT EP TO GND OR LEAVE UNCONNECTED Pin Configurations continued at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at , or visit Maxim s website at

2 1/1/1 Base-T Ethernet LAN Switch MAX89/MAX891/MAX892 ABSOLUTE MAXIMUM RATINGS V V to +V (Note 1)...-.3V to (V+ +.3V) A_, _B_, LED_, _LED_...-.3V to (V+ +.3V) Continuous Current (A_ to _B_)...±12mA Continuous Current (LED_ to _LED_)...±3mA Peak Current (A_ to _B_) (pulsed at 1ms, 1% duty cycle)...±2ma Continuous Power Dissipation (T A = +7 C) 32-Pin TQFN (derate 3.mW/ C above +7 C) W 36-Pin TQFN (derate 26.3mW/ C above +7 C) W Operating Temperature Range...- C to +8 C Junction Temperature...+1 C Storage Temperature Range...-6 C to +1 C Lead Temperature (soldering, 1s)...+3 C Note 1: Signals on, exceeding V+ or GND, are clamped by internal diodes. Limit forward-diode current to maximum current rating. 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 (V+ = +3V to +3.6V, T A = T MIN to T MAX, unless otherwise noted. Typical values are at V+ = 3.3V, T A = +2 C.) (Note 2) ANALOG SWITCH PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS On-Resistance R ON I A_ = -ma, V+ = 3V, T A = +2 C. 1.V V A_ V+ T MIN to T MAX 6. On-Resistance LED Switches R ONLED V+ = 3V, I _LED_ = -ma, 1.V V A_ V+, MAX891/MAX892 Ω Ω On-Resistance Match Between Channels V+ = 3V, T A = +2 C. 1. I A_ = -ma, ΔR ON 1.V V A_ V+ (Note 3) T MIN to T MAX 2 On-Resistance Flatness R FLAT(ON) V+ = 3V, I A_ = -ma, V A_ = 1.V, 2.7V.1 Ω Off-Leakage Current I LA_(OFF) V+ = 3.6V, V A_ =.3V, 3.3V V _B1 or V _B2 = 3.3V,.3V On-Leakage Current I LA_(ON) V+ = 3.6V, V A_ =.3V, 3.3V V _B1 or V _B2 =.3V, 3.3V or floating ESD PROTECTION ESD Protection Human Body Model ±2 kv SWITCH AC PERFORMANCE Insertion Loss I LOS R L = 1Ω, 1MHz < f < 1MHz, Figure 1 Insertion loss with typical transformer, (Note 3) Ω µa.6 db Return Loss R LOS1 Return loss with typical transformer, 1MHz < f < MHz -19 R L = 1Ω, return -13 R LOS2 loss, f in MHz, MHz < f < 1MHz +2log Figure 2 (Note 3) (f/8) db 2

3 1/1/1 Base-T Ethernet LAN Switch ELECTRICAL CHARACTERISTICS (continued) (V+ = +3V to +3.6V, T A = T MIN to T MAX, unless otherwise noted. Typical values are at V+ = 3.3V, T A = +2 C.) (Note 2) Crosstalk PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Differential Crosstalk SWITCH DYNAMICS V CT1 Any switch to any 1MHz < f < 3MHz - V CT2 switch R L = 1Ω, 3MHz < f < 6MHz - V CT3 Figure 3 6MHz < f < 1MHz -3 V DCT1 1MHz < f < 3MHz -6 R L = 1Ω, V DCT2 3MHz < f < 6MHz - Figure V DCT3 6MHz < f < 1MHz - On-Channel -3dB Bandwidth BW R L = 1Ω, Differential pair 1 MHz Off-Capacitance C OFF f = 1MHz, _B_ inputs 3. pf On-Capacitance C ON f = 1MHz, _B_ inputs 6. pf Off-Capacitance, LED Switches C OFFLED f = 1MHz, _LED inputs 2 pf On-Capacitance, LED Switches C ONLED f = 1MHz, _LED inputs 22 pf Turn-On Time t ON V A_ = 1V, Figure 2 ns Turn-Off Time t OFF V A_ = 1V, Figure 2 ns Propagation Delay t PLH, t PHL C L = 1pF, Figure 6.1 ns Output Skew Between Ports t SK(o) Skew between A and A and any other port, Figure 7 Output Skew Same Port t SK(p) Skew between opposite transitions in same port SWITCH LOGIC db db.1 ns.7 ns Input-Voltage Low V IL.8 Input-Voltage High V IH 2. Input-Logic Hysteresis V HYST 1 mv Input Leakage Current I V+ = 3.6V, V = or V+ - + ua Operating Supply-Voltage Range V V Quiescent Supply Current I+ V+ = 3.6V, V = or V+ 28 µa V MAX89/MAX891/MAX892 Note 2: Specifications at - C are guaranteed by design. Note 3: Guaranteed by design. 3

4 1/1/1 Base-T Ethernet LAN Switch MAX89/MAX891/MAX892 (V+ = 3.3V, T A = +2 C, unless otherwise noted.) RON (Ω) RONLED (Ω) ON-RESISTANCE vs. V A_ V+ = 3.V, 3.3V, 3.6V V A_ (V) LED_ ON-RESISTANCE vs. TEMPERATURE T A = +8 C T A = - C V A_ (V) T A = +2 C MAX89 toc1 MAX89 toc RON (Ω) LEAKAGE CURRENT (pa) ON-RESISTANCE vs. V A_ T A = +8 C T A = - C V A_ (V) Typical Operating Characteristics T A = +2 C LEAKAGE CURRENT vs. TEMPERATURE I LA_(OFF) TEMPERATURE ( C) I LA_(ON) MAX89 toc2 MAX89 toc RONLED (Ω) CHARGE INJECTION (pc) LED_ ON-RESISTANCE vs. V A_ V+ = 3.V V+ = 3.3V V A_ (V) V+ = 3.6V CHARGE INJECTION vs. V A_ V A_ (V) MAX89 toc3 MAX89 toc6 QUIESCENT SUPPLY CURRENT (μa) QUIESCENT SUPPLY CURRENT vs. TEMPERATURE MAX89 toc7 QUIESCENT SUPPLY CURRENT (μa) QUIESCENT SUPPLY CURRENT vs. LOGIC LEVEL MAX89 toc8 LOGIC THRESHOLD (V) LOGIC THRESHOLD vs. SUPPLY VOLTAGE 1.8 V TH V TH MAX89 toc TEMPERATURE ( C) LOGIC LEVEL (V) SUPPLY VOLTAGE (V)

5 1/1/1 Base-T Ethernet LAN Switch Typical Operating Characteristics (continued) (V+ = 3.3V, T A = +2 C, unless otherwise noted.) ton/toff (ns) OUTPUT RISE-/FALL-TIME DELAY (ps) TURN-ON/-OFF TIME vs. SUPPLY VOLTAGE t OFF t ON SUPPLY VOLTAGE (V) RISE-/FALL-TIME PROPAGATION DELAY vs. TEMPERATURE t PHL t PLH MAX89 toc1 MAX89 toc13 ton/toff (ns) PULSE SKEW (ps) TURN-ON/-OFF TIME vs. TEMPERATURE t ON t OFF TEMPERATURE ( C) PULSE SKEW vs. SUPPLY VOLTAGE t SK(p) MAX89 toc11 MAX89 toc1 OUTPUT RISE/FALL-TIME DELAY (ps) PULSE SKEW (ps) RISE-/FALL-TIME PROPAGATION DELAY vs. SUPPLY VOLTAGE t PHL t PLH SUPPLY VOLTAGE (V) PULSE SKEW vs. TEMPERATURE t SK(p) MAX89 toc12 MAX89 toc1 MAX89/MAX891/MAX TEMPERATURE ( C) SUPPLY VOLTAGE (V) TEMPERATURE ( C) OUTPUT SKEW (ps) OUTPUT SKEW vs. SUPPLY VOLTAGE t SK(o)_FALL t SK(o)_RISE MAX89 toc16 OUTPUT SKEW (ps) OUTPUT SKEW vs. TEMPERATURE t SK(o)_FALL t SK(o)_RISE MAX89 toc17 DIFFERENTIAL INSERTION LOSS (db) DIFFERENTIAL INSERTION LOSS vs. FREQUENCY MAX89 toc SUPPLY VOLTAGE (V) TEMPERATURE ( C) FREQUENCY (MHz)

6 1/1/1 Base-T Ethernet LAN Switch MAX89/MAX891/MAX892 Typical Operating Characteristics (continued) (V+ = 3.3V, T A = +2 C, unless otherwise noted.) DIFFERENTIAL RETURN LOSS (db) DIFFERENTIAL RETURN LOSS vs. FREQUENCY FREQUENCY (MHz) SINGLE-ENDED CROSSTALK (db) MAX89 toc19 DIFFERENTIAL CROSSTALK (db) SINGLE-ENDED CROSSTALK vs. FREQUENCY FREQUENCY (MHz) DIFFERENTIAL CROSSTALK vs. FREQUENCY FREQUENCY (MHz) MAX89 toc22 SINGLE-ENDED INSERTION LOSS (db) MAX89 toc2 SINGLE-ENDED OFF-ISOLATION (db) SINGLE-ENDED OFF-ISOLATION vs. FREQUENCY FREQUENCY (MHz) SINGLE-ENDED INSERTION LOSS vs. FREQUENCY FREQUENCY (MHz) MAX89 toc23 MAX89 toc21 6

7 1/1/1 Base-T Ethernet LAN Switch PIN MAX89 MAX891 MAX892 31, 32, 1, 2, , 32, 1, 2, , 1, 2, 3, 7 1 NAME A A7 3 LED LED Input FUNCTION Differential PHY Interface Pair. Connects to the Ethernet PHY. LED1 LED1 Output. Connects LED to LED1 when =. 6 LED2 LED2 Output. Connects LED to LED2 when = , 12 6, 12 N.C. No Connection. Not internally connected GND Ground 12 LED1 LED1 Input 13 1LED1 1LED1 Output. Connects LED1 to 1LED1 when =. 1 1LED2 1LED2 Output. Connects LED1 to 1LED2 when = 1. 13, 1, 17, 18, 21, 22, 2, 26 1, 16, 19, 2, 23, 2, 27, 28 13, 1, 17, 18, 21, 22, 2, 26 1, 16, 19, 2, 23, 2, 27, 28 1, 16, 19, 2, 23, 2, 28, 29 17, 18, 21, 22, 2, 26, 3, 31 7B2 B2 7B1 B1 B2 Differential Transformer Pair B1 Differential Transformer Pair Pin Description Select Input. Selects switch connection. See the Truth Table (Table 1). 32 2LED2 2LED2 Output. Connects LED2 to 2LED2 when = LED1 2LED1 Output. Connects LED2 to 2LED1 when =. 3 LED2 LED2 Input V+ Positive Supply-Voltage Input EP Exposed Paddle. Not internally connected. Leave EP unconnected or connect to ground. MAX89/MAX891/MAX892 7

8 1/1/1 Base-T Ethernet LAN Switch MAX89/MAX891/MAX892 INSERTION LOSS Ω 1 3 MAX TQFN MINI CKT BALUN Ω B1 6 A :1 CB1 Figure 1. Differential Insertion Loss RETURN LOSS R16 9.9Ω R17 9.9Ω A2 2 A3 3 MAX TQFN 2 Ω A1 1 Ω Ω 6 3 C2.1μF Ω Ω 6 C2.1μF PULSE H7 2-PIN PACKAGE PULSE H7 2-PIN PACKAGE Ω Ω R1 7Ω C3 1pF CB3 Ω Ω R1 7Ω C3 1pF MINI CKT BALUN 3 1: 1 CB3 Test Circuits MINI CKT BALUN 3 Ω 6 1 1: Ω Figure 2. Differential Return Loss 8

9 1/1/1 Base-T Ethernet LAN Switch SINGLE-ENDED BANDWIDTH Ω SINGLE-ENDED CROSSTALK Ω Ω SINGLE-ENDED OFF-ISOLATION Ω R1 9.9Ω Figure 3. Single-Ended Bandwidth, Crosstalk and Off-Isolation A 36 A2 2 A3 3 A 7 MAX TQFN B1 31 2B B1 22 Ω R13 9.9Ω R1 9.9Ω Ω Test Circuits (continued) MAX89/MAX891/MAX892 Detailed Description The MAX89/MAX891/MAX892 are high-speed analog switches targeted for 1/1/1 Base-T applications. In a typical application, the MAX89/MAX891/ MAX892 switch the signals from two separate interface transformers and connect the signals to a single 1/1/1 Base-T Ethernet PHY (see the Typical Operating Circuit). This configuration simplifies docking station design by avoiding signal reflections associated with unterminated transmission lines in a T configuration. The MAX891 and MAX892 also include LED switches that allow the LED output signals to be routed to a docking station along with the Ethernet signals. See the Functional Diagrams. The MAX89/MAX891/MAX892 switches provide an extremely low capacitance and on-resistance to meet Ethernet insertion and return-loss specifications. The MAX891/MAX892 feature one and three built-in LED switches, respectively. The MAX89/MAX891/MAX892 incorporate a unique architecture design utilizing only n-channel switches within the main Ethernet switch, reducing I/O capacitance and channel resistance. An internal two-stage charge pump with a nominal output of 7.V provides the high voltage needed to drive the gates of the n-channel switches, while maintaining a consistently low R ON throughout the input signal range. An internal bandgap reference set to 1.23V and an internal oscillator running at 2.MHz provide proper charge-pump operation. Unlike other charge-pump circuits, the MAX89/ MAX891/MAX892 include internal flyback capacitors, reducing design time, board space, and cost. Digital Control Inputs The MAX89/MAX891/MAX892 provide a single digital control. controls the switches as well as the LED switches as shown in Table 1. Table 1. Truth Table CONNECTION A_ to _B1, LED_ to _LED1 1 A_ to _B2, LED_ to _LED2 9

10 1/1/1 Base-T Ethernet LAN Switch MAX89/MAX891/MAX892 Figure. Differential Crosstalk DIFFERENTIAL CROSSTALK TRANSMIT CKT Ω Analog Signal Levels The on-resistance of the MAX89/MAX891/MAX892 is very low and stable as the analog input signals are swept from ground to V+ (see the Typical Operating Characteristics). The switches are bidirectional, allowing A_ and _B_ to be configured as either inputs or outputs. ESD Protection The MAX89/MAX891/MAX892 are characterized using the Human Body Model for ±2kV of ESD protection. Figure 8 shows the Human Body Model, and Figure 9 shows the current waveform the Human Body Model generates when discharged into a low-impedance load. This model consists of a 1pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.kΩ resistor. Applications Information Typical Operating Circuit The Typical Operating Circuit depicts the MAX89/ MAX891/MAX892 in a 1/1/1 Base-T docking station application. 1 MINI CKT BALUN 6 3 :1 DIFFERENTIAL CROSSTALK RECEIVE CKT Ω 1 3 MINI CKT BALUN 6 :1 CB CB Ω Ω A 7 A 8 A6 9 A7 1 MAX TQFN AB1 22 B1 21 6B1 18 7B1 17 R3 9.9Ω R 9.9Ω R3 9.9Ω R 9.9Ω Line-Card Redundancy (Ethernet T3/E3) Figure 1 shows the MAX89/MAX891/MAX892 in a line-card redundancy configuration. Power-Supply Sequencing and Overvoltage Protection Caution: Do not exceed the absolute maximum ratings. Stresses beyond the listed ratings may cause permanent damage to the device. Proper power-supply sequencing is recommended for all CMOS devices. Always apply V+ before applying analog signals, especially if the analog signal is not current limited. Layout High-speed switches require proper layout and design procedures for optimum performance. Keep designcontrolled-impedance printed circuit board traces as short as possible. Ensure that bypass capacitors are as close to the device as possible. Use large ground planes where possible. 1

11 1/1/1 Base-T Ethernet LAN Switch 1.2V t ON 9% t OFF 1% Figure. ENABLE and DISABLE Times A_ t PLHX 1.2V t PHLX A_ V 2.V V t OFF 9% V t ON 9% 3.V 2.V 1.V A_ A B_ t PLH PULSE SKEW = t SK(p) = t PHL - t PLH THE MAX89/MAX891/MAX892 SWITCHES ARE FULLY BIDIRECTIONAL. Figure 6. Propagation Delay Times R C 1MΩ R D 1Ω t PHL 3.V 2.V 1.V V OH 2.V V OL MAX89/MAX891/MAX892 V OH CHARGE-CURRENT LIMIT RESISTOR DISCHARGE RESISTANCE _B_ 2.V V OL HIGH- VOLTAGE DC SOURCE Cs 1pF STORAGE CAPACITOR DEVICE UNDER TEST t PLHY t PHLY V OH 2.V _B_ V OL PULSE SKEW = t SK(p) = t PHLY - t PLHX OR t PHLy - t PHLx THE MAX89/MAX891/MAX892 SWITCHES ARE FULLY BIDIRECTIONAL. Figure 7. Output Skew Figure 8. Human Body ESD Test Model 11

12 1/1/1 Base-T Ethernet LAN Switch MAX89/MAX891/MAX892 AMPERES I P 1% 9% 36.8% 1% t RL Ir TIME t DL CURRENT WAVEFORM Figure 9. Human Body Model Current Waveform PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) ETHERNET PHYs OR T3/E3 LIUs PRIMARY CARD ETHERNET PHYs OR T3/E3 LIUs PROTECTION CARD MAX89 MAX891 MAX892 PROTECTION SWITCH TRANSFORMER SWITCHING CARD Figure 1. Typical Application for Line-Card Redundancy 12

13 1/1/1 Base-T Ethernet LAN Switch DOCKING STATION NOTEBOOK B2 1B2 2B2 3B2 CONNECTOR Typical Operating Circuit TRANSFORMER RJ- LED MAX89/MAX891/MAX892 ETHERNET PHY/MAC TRD_P TRD_N TRD1_P TRD1_N TRD2_P TRD2_N A A1 A2 A3 A A MAX89/MAX891/MAX892 B2 B2 6B2 7B2 _LED2 B1 1B1 TRD3_P TRD3_N A6 A7 2B1 B1 B1 TRANSFORMER RJ- LED_OUT LED_ 6B1 7B1 _LED1 _DOCK LED 13

14 1/1/1 Base-T Ethernet LAN Switch MAX89/MAX891/MAX892 A A1 A2 A3 A A A6 A7 MAX89 B1 1B1 B2 1B2 2B1 2B2 3B2 B1 B1 B2 B2 6B1 7B1 6B2 7B2 A A1 A2 A3 A A A6 A7 LED Functional Diagrams MAX891 B1 1B1 B2 1B2 2B1 2B2 3B2 B1 B1 B2 B2 6B1 7B1 6B2 7B2 LED1 LED2 1

15 1/1/1 Base-T Ethernet LAN Switch A A1 A2 A3 A A A6 A7 LED LED1 LED2 Functional Diagrams (continued) B1 1B1 B2 1B2 2B1 2B2 3B2 B1 B1 B2 B2 6B1 7B1 6B2 7B2 LED1 LED2 1LED1 1LED2 2LED1 2LED2 MAX89/MAX891/MAX892 MAX892 1

16 1/1/1 Base-T Ethernet LAN Switch MAX89/MAX891/MAX892 TOP VIEW TQFN *EP = EXPOSED PAD. CONNECT EP TO GND OR LEAVE UNCONNECTED PROCESS: BiCMOS A1 A V+ B1 1B1 B2 1B A B1 A LED B2 LED1 21 3B2 LED2 MAX891 2 B1 N.C B1 A 7 *EP 18 B2 A 8 17 B A6 A7 GND N.C. 7B2 6B2 7B1 6B1 Chip Information A1 1 A2 2 A3 3 LED LED1 LED2 6 A 7 A 8 A6 9 Pin Configurations (continued) A V+ LED2 2LED1 2LED2 B1 1B *EP MAX A7 GND LED1 1LED1 1LED2 7B2 6B2 TQFN B2 7B1 1B2 6B1 *EP = EXPOSED PAD. CONNECT EP TO GND OR LEAVE UNCONNECTED B1 2B2 3B2 B1 B1 B2 B2 Package Information For the latest package outline information and land patterns, go to PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 32 TQFN-EP T TQFN-EP T

17 1/1/1 Base-T Ethernet LAN Switch REVISION NUMBER REVISION DATE DESCRIPTION Revision History PAGES CHANGED 1 8/ Removed future product part number 2 8/7 Added exposed pad information 1, 7, 1, 1, 16 MAX89/MAX891/MAX892 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 12 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.