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What is 74HC123?

This electronic component, produced by the manufacturer "NXP Semiconductors", performs the same function as "Dual retriggerable monostable multivibrator".


74HC123 Datasheet PDF - NXP Semiconductors

Part Number 74HC123
Description Dual retriggerable monostable multivibrator
Manufacturers NXP Semiconductors 
Logo NXP Semiconductors Logo 


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74HC123; 74HCT123
Dual retriggerable monostable multivibrator with reset
Rev. 10 — 3 December 2015
Product data sheet
1. General description
The 74HC123; 74HCT123 are high-speed Si-gate CMOS devices and are pin compatible
with Low-power Schottky TTL (LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC123; 74HCT123 are dual retriggerable monostable multivibrators with output
pulse width control by three methods:
1. The basic pulse is programmed by selection of an external resistor (REXT) and
capacitor (CEXT).
2. Once triggered, the basic output pulse width may be extended by retriggering the
gated active LOW-going edge input (nA) or the active HIGH-going edge input (nB). By
repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made
as long as desired. Alternatively an output delay can be terminated at any time by a
LOW-going edge on input nRD, which also inhibits the triggering.
3. An internal connection from nRD to the input gates makes it possible to trigger the
circuit by a HIGH-going signal at input nRD as shown in Table 3.
Schmitt-trigger action in the nA and nB inputs, makes the circuit highly tolerant to slower
input rise and fall times.
The 74HC123; 74HCT123 are identical to the 74HC423; 74HCT423 but can be triggered
via the reset input.
2. Features and benefits
DC triggered from active HIGH or active LOW inputs
Retriggerable for very long pulses up to 100 % duty factor
Direct reset terminates output pulse
Schmitt-trigger action on all inputs except for the reset input
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
Specified from 40 C to +85 C and from 40 C to +125 C

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74HC123 equivalent
NXP Semiconductors
74HC123; 74HCT123
Dual retriggerable monostable multivibrator with reset
6. Functional description
Table 3.
Input
nRD
L
X
X
H
Function table[1]
nA
X
H
X
L
H
L
nB
X
X
L
H
H
Output
nQ
L
L[2]
L[2]
nQ
H
H[2]
H[2]
[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care; = LOW-to-HIGH transition; = HIGH-to-LOW transition;
= one HIGH level output pulse;
= one LOW level output pulse.
[2] If the monostable was triggered before this condition was established, the pulse will continue as programmed.
7. Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol Parameter
Conditions
Min Max Unit
VCC supply voltage
IIK input clamping current
VI < 0.5 V or VI > VCC + 0.5 V
0.5 +7 V
- 20 mA
IOK output clamping current
IO output current
VO < 0.5 V or VO > VCC + 0.5 V
except for pins nREXT/CEXT;
VO = 0.5 V to (VCC + 0.5 V)
- 20 mA
- 25 mA
ICC
IGND
Tstg
Ptot
supply current
ground current
storage temperature
total power dissipation
SO16 package
SSOP16 package
-
-
65
[1] -
[2] -
50
50
+150
500
500
mA
mA
C
mW
mW
TSSOP16 package
[2] -
500 mW
DHVQFN16 package
[3] -
500 mW
[1] For SO16 package: Ptot derates linearly with 8 mW/K above 70 C.
[2] For SSOP16 and TSSOP16 packages: Ptot derates linearly with 5.5 mW/K above 60 C.
[3] For DHVQFN16 package: Ptot derates linearly with 4.5 mW/K above 60 C.
74HC_HCT123
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 10 — 3 December 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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74HC123


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