SCLS352H − JULY 1997 − REVISED OCTOBER 2005
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DOperating Range 2-V to 5.5-V VCC
DSchmitt-Trigger Circuitry On A, B, and CLR
Inputs for Slow Input Transition Rates
DEdge Triggered From Active-High or
Active-Low Gated Logic Inputs
DRetriggerable for Very Long Output Pulses
DOverriding Clear Terminates Output Pulse
DGlitch-Free Power-Up Reset On Outputs
DLatch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
DESD Protection Exceeds JESD 22
− 2000-V Human-Body Model (A114-A)
− 200-V Machine Model (A115-A)
− 1000-V Charged-Device Model (C101)
description/ordering information
The ’AHC123A devices are dual retriggerable
monostable multivibrators designed for 2-V to
5.5-V VCC operation.
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
high, and the A input goes low. In the third method,
the A input is low, the B input is high, and the clear
(CLR) input goes high.
ORDERING INFORMATION
TAPACKAGE†ORDERABLE
PART NUMBER TOP-SIDE
MARKING
PDIP − N Tube SN74AHC123AN SN74AHC123AN
Tube SN74AHC123AD
SOIC − D Tape and reel SN74AHC123ADR AHC123A
−40°C to 85°CSSOP − DB Tape and reel SN74AHC123ADBR HA123A
TSSOP − PW Tape and reel SN74AHC123APWR HA123A
TVSOP − DGV Tape and reel SN74AHC123ADGVR HA123A
CDIP − J Tube SNJ54AHC123AJ SNJ54AHC123AJ
−55°C to 125°CCFP − W Tube SNJ54AHC123AW SNJ54AHC123AW
LCCC − FK Tube SNJ54AHC123AFK SNJ54AHC123AFK
†Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Copyright 2005, Texas Instruments Incorporated
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.
SN54AHC123A ...J OR W PACKAGE
SN74AHC123A . . . D, DB, DGV, N, OR PW PACKAGE
(TOP VIEW)
SN54AHC123A . . . FK PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1A
1B
1CLR
1Q
2Q
2Cext
2Rext/Cext
GND
VCC
1Rext/Cext
1Cext
1Q
2Q
2CLR
2B
2A
3212019
910111213
4
5
6
7
8
18
17
16
15
14
1Cext
1Q
NC
2Q
2CLR
1CLR
1Q
NC
2Q
2Cext
1B
1A
NC
2A
2B V
1R
2R GND
NC CC
NC − No internal connection
ext/Cext
ext/Cext
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