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SN54AHCT123A Datasheet Preview

SN54AHCT123A Datasheet

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

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SN54AHCT123A, SN74AHCT123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
D Inputs Are TTL-Voltage Compatible
D Schmitt-Trigger Circuitry On A, B, and CLR
Inputs for Slow Input Transition Rates
D Edge Triggered From Active-High or
Active-Low Gated Logic Inputs
D Retriggerable for Very Long Output Pulses
D Overriding Clear Terminates Output Pulse
D Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
D ESD 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
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.
The output pulse duration is programmed by
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
Rext/Cext and VCC. To obtain variable pulse
durations, connect an external variable resistance
between Rext/Cext and VCC. The output pulse
duration also can be reduced by taking CLR low.
SCLS420G – JUNE 1998 – REVISED APRIL 2003
SN54AHCT123A . . . J OR W PACKAGE
SN74AHCT123A . . . D, DB, DGV, N, OR PW PACKAGE
(TOP VIEW)
1A
1B
1CLR
1Q
2Q
2Cext
2Rext/Cext
GND
1
2
3
4
5
6
7
8
16 VCC
15 1Rext/Cext
14 1Cext
13 1Q
12 2Q
11 2CLR
10 2B
9 2A
SN54AHCT123A . . . FK PACKAGE
(TOP VIEW)
1CLR
1Q
NC
2Q
2Cext
3 2 1 20 19
4 18
5 17
6 16
7 15
8 14
9 10 11 12 13
1Cext
1Q
NC
2Q
2CLR
NC – No internal connection
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP – N
Tube
SN74AHCT123AN
SN74AHCT123AN
–40°C to 85°C
SOIC – D
SSOP – DB
Tube
Tape and reel
Tape and reel
SN74AHCT123AD
SN74AHCT123ADR
SN74AHCT123ADBR
AHCT123A
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.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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.
1




etcTI

SN54AHCT123A Datasheet Preview

SN54AHCT123A Datasheet

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

No Preview Available !

SN54AHCT123A, SN74AHCT123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS420G JUNE 1998 REVISED APRIL 2003
description/ordering information(continued)
Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input
pulse. The A, B, and CLR inputs have Schmitt triggers with sufficient hysteresis to handle slow input transition
rates with jitter-free triggering at the outputs.
Once triggered, the basic pulse duration can be extended by retriggering the gated low-level-active (A) or
high-level-active (B) input. Pulse duration can be reduced by taking CLR low. CLR input can be used to override
A or B inputs. The input/output timing diagram illustrates pulse control by retriggering the inputs and early
clearing.
The variance in output pulse duration from device to device typically is less than ±0.5% for given external timing
components. An example of this distribution for the AHCT123A is shown in Figure 10. Variations in output pulse
duration versus supply voltage and temperature are shown in Figure 6.
During power up, Q outputs are in the low state, and Q outputs are in the high state. The outputs are glitch free,
without applying a reset pulse.
For additional application information on multivibrators, see the application report, Designing With the
SN74AHC123A and SN74AHCT123A, literature number SCLA014.
FUNCTION TABLE
(each multivibrator)
INPUTS
OUTPUTS
CLR A B Q Q
LXXLH
X H X LH
X X L LH
HL
H#H
LH
These outputs are based on the
assumption that the indicated
steady-state conditions at the A and
B inputs have been set up long enough to
complete any pulse started before the
setup.
logic diagram, each multivibrator (positive logic)
A
Rext/Cext
Cext
BQ
CLR
RQ
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265


Part Number SN54AHCT123A
Description DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
Maker etcTI
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