Texas Instruments SN54AHCT123A, SN74AHCT123A Data Sheet

查询5962-9861601Q2A供应商 SN54AHCT123A, SN74AHCT123A

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

SCLS420G – JUNE 1998 – REVISED APRIL 2003

Inputs Are TTL-Voltage Compatible SN54AHCT123A J OR W PACKAGE SN74AHCT123A D, DB, DGV, N, OR PW PACKAGE

Schmitt-Trigger Circuitry On A, B, and CLR

(TOP VIEW)

Inputs for Slow Input Transition Rates

Edge Triggered From Active-High or 1A VCC

Active-Low Gated Logic Inputs 1B 1Rext/Cext 1CLR 1Cext

Retriggerable for Very Long Output Pulses

Overriding Clear Terminates Output Pulse

Latch-Up Performance Exceeds 100 m A Per

2Cext 2CLR

JESD 78, Class II

2Rext/Cext 2B

ESD Protection Exceeds JESD 22

GND 2A

– 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A)

– 1000-V Charged-Device Model (C101) SN54AHCT123A FK PACKAGE

(TOP VIEW)

description/ordering information These edge-triggered multivibrators feature output pulse-duration control by three methods. In the first method, the A input is low, and the B input goes high. In the second method, the B input is

1CLR 1Cext

high, and the A input goes low. In the third method,

the A input is low, the B input is high, and the clear

NC NC

(CLR) input goes high.

The output pulse duration is programmed by

2Cext 2CLR

selecting external resistance and capacitance values. The external timing capacitor must be connected between Cext and Rext/Cext (positive) and an external resistor connected between 2R 1B

ex t/ ex

Rext/Cext and VCC. To obtain variable pulse 1A durations, connect an external variable resistance

between Rext/Cext and VCC. The output pulse NC – No internal connection 2A

duration also can be reduced by taking CLR low.

2B 1R ex t/ ex

ORDERING INFORMATION

ORDERABLE TOP-SIDE

TA PACKAGE†

PART NUMBER MARKING

PDIP – N Tube SN74AHCT123AN SN74AHCT123AN

Tube SN74AHCT123AD

SOIC AHCT123A

Tape and reel SN74AHCT123ADR

40°C to 85°C

SSOP – DB Tape and reel SN74AHCT123ADBR HB123A TSSOP – PW Tape and reel SN74AHCT123APWR HB123A TVSOP – DGV Tape and reel SN74AHCT123ADGVR HB123A CDIP – J Tube SNJ54AHCT123AJ SNJ54AHCT123AJ

–55°C to 125°C CFP – W Tube SNJ54AHCT123AW SNJ54AHCT123AW

LCCC – FK Tube SNJ54AHCT123AFK SNJ54AHCT123AFK

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date. Copyright  2003, Texas Instruments Incorporated

Products conform to specifications per the terms of Texas Instruments On products compliant to MIL-PRF-38535, all parameters are tested standard warranty. Production processing does not necessarily include unless otherwise noted. On all other products, production testing of all parameters. processing does not necessarily include testing of all parameters.

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