MM54HCT192 MM74HCT192 Synchronous Decade Up Down Counters
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1 MM54HCT192 MM74HCT192 Synchronous Decade Up Down Counters General Description These high speed synchronous counters utilize advanced silicon-gate CMOS technology to achieve the high noise immunity and low power consumption of CMOS technology along with the speeds of low power Schottky TTL The MM54HCT192 MM74HCT192 is a decade counter having two separate clock inputs an COUNT UP input and a COUNT DOWN input All outputs of the flip-flops are simultaneously triggered on the low-to-high transition of either clock while the other input is held high The direction of counting is determined by which input is clocked This device has TTL compatible inputs It can drive 15 LS- TTL loads This counter may be preset by entering the desired data on the DATA A DATA B DATA C and DATA D inputs When the LOAD input is taken low the data is loaded independently of either clock input This feature allows the counter to be used as a divide-by-n counter by modifying the count length with the preset inputs In addition the HCT192 can also be cleared This is accomplished by inputting a high on the CLEAR input All 4 internal stages are set to a low level independently of either COUNT input Connection Diagram Dual-In-Line Package January 1988 Both a BORROW and CARRY output are provided to enable cascading of both up and down counting functions The BORROW output produces a negative-going pulse when the counter underflows and the CARRY outputs a pulse when the counter overflows The counter can be cascaded by connecting the CARRY and BORROW outputs of one device to the COUNT UP and COUNT DOWN inputs respectively of the next device All inputs are protected from damage due to static discharge by diodes to V CC and ground Features Y Y Y Low quiescent supply current 80 ma maximum (74HCT Series) Low input current 1 ma maximum TTL compatible inputs Truth Table Up Count Down Clear Load Function u H L H Count Up H u L H Count Down X X H X Clear X X L L Load H e high level L e low level ue transition from low-to-high X e don t care MM54HCT192 MM74HCT192 Synchronous Decade Up Down Counters Order Number MM54HCT192 or MM74HCT192 TL F C1995 National Semiconductor Corporation TL F 9400 RRD-B30M105 Printed in U S A
2 Absolute Maximum Ratings (Notes 1 and 2) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage (V CC ) b0 5V to a7 0V DC Input Voltage (V IN ) b1 5V to V CC a 1 5V DC Output Voltage (V OUT ) b0 5V to V CC a 0 5V Clamp Diode Current (I IK I OK ) g20 ma DC Output Current per Pin (I OUT ) g25 ma DC V CC or GND Current per Pin(I CC ) g50 ma Storage Temperature Range (T STG ) b65 Ctoa150 C Power Dissipation (P D ) (Note 3) 600 mw S O Package only 500 mw Lead Temperature (T L ) (Soldering 10 seconds) 260 C Operating Conditions Min Max Units Supply Voltage (V CC ) V DC Input or Output Voltage (V IN V OUT ) 0 V CC V Operating Temp Range (T A ) MM74HCT b40 a85 C MM54HCT b55 a125 C Input Rise or Fall Times (t r t f ) 500 ns DC Electrical Characteristics V CC e 5Vg10% unless otherwise specified 74HCT 54HCT T A e25 C Symbol Parameter Conditions T A eb40 Ctoa85 C T A eb55 Ctoa125 C Units Typ Guaranteed Limits V IH Minimum High Level Input Voltage V V IL Maximum Low Level Input Voltage V V OH Minimum High Level V IN e V IH or V IL Output Voltage li OUTl e 20 ma V CC V CC b0 1 V CC b0 1 V CC b0 1 V li OUTl e 4 0 ma V CC e 4 5V V li OUTl e 4 8 ma V CC e 5 5V V V OL Maximum Low Level V IN e V IH or V IL Voltage li OUTl e 20 ma V li OUTl e 4 0 ma V CC e 4 5V V li OUTl e 4 8 ma V CC e 5 5V V I IN Maximum Input V IN e V CC or GND Current V IH or V IL g0 1 g1 0 g1 0 ma I CC Maximum Quiescent V IN e V CC or GND Supply Current I OUT e 0 ma ma V IN e 2 4V or 0 5V (Note 4) ma Note 1 Absolute Maximum Ratings are those values beyond which damage to the device may occur Note 2 Unless otherwise specified all voltages are referenced to ground Note 3 Power dissipation temperature derating plastic N package b12 mw C from 65 C to85 C ceramic J package b 12 mw C from 100 C to125 C Note 4 Measured per pin all other inputs held at V CC or GND 2
3 AC Electrical Characteristics (Note 6) V CC e 5V T A e 25 C C L e 15 pf t r e t f e 6 ns (unless otherwise specified) Symbol f MAX Parameter Maximum Clock Frequency From To Guaranteed Conditions Typ (Input) (Output) Limit Load QA QB Data A QA QB B C D Count-Up QA QB or -Down Units 35 MHz 26 ns 25 ns 26 ns Count-Up Carry 22 ns Count-Down Borrow 22 ns Clear QA QB 25 ns AC Electrical Characteristics (Note 6) V CC e 5V g10% C L e 50 pf (unless otherwise specified) 74HC 54HC From To Te25 C Te25 C Symbol Parameter Teb40 Ctoa85 C Teb55 Ctoa125 C (Input) (Output) Units Typ Guaranteed Limits f MAX Maximum Clock Frequency MHz QA QB Load ns Data A QA QB ns Count-Up QA QB or -Down ns Count-Up Carry ns Count- Down Borrow ns QA QB Clear ns t W t S t H t REM t REM t W t W Minimum Clock Pulse Width ns Minimum Setup Time Data before Load-LH ns Minimum Hold Time Data after Load-LH b ns Minimum Removal Time Load to Count b ns Minimum Removal Time Clear to Count ns Minimum Load Pulse Width ns Minimum Clear ns Pulse Width t TLH THL Output Rise or Fall Time ns C PD Power Dissipation Capacitance 40 pf C IN Maximum Input Capacitance pf Note 5 C PD determines the no load dynamic power consumption P D ec PD V 2 CC fai CC V CC and the no load dynamic current consumption I s ec PD V CC fai CC Note 6 Refer to Section 1 for Typical MM54 74HCT AC Switchforms and Test Circuits 3
4 Logic Diagram HCT192 Synchronous 4-Bit Up Down Decade Counter TL F
5 Logic Waveforms HCT192 Synchronous Decade Counters Typical Clear Load and Count Sequences Sequences (1) Clear outputs to zero (2) Load (preset) to BCD seven (3) Count up to eight nine carry zero one and two (4) Count down to one zero borrow nine eight and seven TL F Physical Dimensions inches (millimeters) Ceramic Dual-In-Line Package (J) Order Number MM54HCT192J or MM74HCT192J NS Package Number J16A 5
6 MM54HCT192 MM74HCT192 Synchronous Decade Up Down Counters Physical Dimensions inches (millimeters) (Continued) LIFE SUPPORT POLICY Molded Dual-In-Line Package (N) Order Number MM74HCT192N NS Package Number N16E NATIONAL S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or 2 A critical component is any component of a life systems which (a) are intended for surgical implant support device or system whose failure to perform can into the body or (b) support or sustain life and whose be reasonably expected to cause the failure of the life failure to perform when properly used in accordance support device or system or to affect its safety or with instructions for use provided in the labeling can effectiveness be reasonably expected to result in a significant injury to the user National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd Japan Ltd 1111 West Bardin Road Fax (a49) th Floor Straight Block Tel Arlington TX cnjwge tevm2 nsc com Ocean Centre 5 Canton Rd Fax Tel 1(800) Deutsch Tel (a49) Tsimshatsui Kowloon Fax 1(800) English Tel (a49) Hong Kong Fran ais Tel (a49) Tel (852) Italiano Tel (a49) Fax (852) National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications
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