SN54AHCT123A, SN74AHCT123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS420G – JUNE 1998 – REVISED APRIL 2003
SN54AHCT123A . . . J OR W PACKAGE
SN74AHCT123A . . . D, DB, DGV, N, OR PW PACKAGE
(TOP VIEW)
Inputs Are TTL-Voltage Compatible
Schmitt-Trigger Circuitry On A, B, and CLR
Inputs for Slow Input Transition Rates
1A
1B
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
Edge Triggered From Active-High or
Active-Low Gated Logic Inputs
1R /C
ext ext
1CLR
1Q
1C
1Q
ext
Retriggerable for Very Long Output Pulses
Overriding Clear Terminates Output Pulse
2Q
12 2Q
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
11
10
9
2C
2CLR
2B
ext
2R /C
ext ext
GND
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
2A
SN54AHCT123A . . . FK PACKAGE
(TOP VIEW)
– 1000-V Charged-Device Model (C101)
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
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.
3
2
1 20 19
18
1C
1Q
1CLR
1Q
4
5
6
7
8
ext
17
16
NC
NC
15 2Q
14
9 10 11 12 13
2Q
The output pulse duration is programmed by
selecting external resistance and capacitance
values. The external timing capacitor must be
2CLR
2C
ext
connected between C and R /C (positive)
ext
ext ext
and an external resistor connected between
/C and V . To obtain variable pulse
R
ext ext
CC
durations, connectanexternalvariableresistance
between R /C and V . The output pulse
duration also can be reduced by taking CLR low.
NC – No internal connection
ext ext
CC
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
PDIP – N
SOIC – D
Tube
SN74AHCT123AN
SN74AHCT123AN
Tube
SN74AHCT123AD
AHCT123A
Tape and reel
Tape and reel
Tape and reel
Tape and reel
Tube
SN74AHCT123ADR
SN74AHCT123ADBR
SN74AHCT123APWR
SN74AHCT123ADGVR
SNJ54AHCT123AJ
SNJ54AHCT123AW
SNJ54AHCT123AFK
–40°C to 85°C
–55°C to 125°C
SSOP – DB
TSSOP – PW
TVSOP – DGV
CDIP – J
HB123A
HB123A
HB123A
SNJ54AHCT123AJ
SNJ54AHCT123AW
SNJ54AHCT123AFK
CFP – W
Tube
LCCC – FK
Tube
†
Packagedrawings, 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.
Copyright 2003, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
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