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74HC423BQ Datasheet Preview

74HC423BQ Datasheet

Dual retriggerable monostable multivibrator

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74HC423
Dual retriggerable monostable multivibrator with reset
Rev. 7 — 11 February 2016
Product data sheet
1. General description
The 74HC423 is a dual retriggerable monostable multivibrator with output pulse width
control by two methods. The basic pulse time is programmed by selection of an external
resistor (REXT) and capacitor (CEXT). Once triggered, the basic output pulse width may be
extended by retriggering (nA) or (nB). By repeating this process, the output pulse period
(nQ = HIGH, nQ = LOW) can be made as long as desired. When nRD is LOW, it forces
the nQ output LOW, the nQ output HIGH and also inhibits the triggering. Schmitt-trigger
action in the nA and nB inputs, makes the circuit highly tolerant to slower input rise and fall
times. The '423' is identical to the '123' but cannot be triggered via the reset input. Inputs
include clamp diodes. This enables the use of current limiting resistors to interface inputs
to voltages in excess of VCC.
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
Complies with JEDEC standard no. 7A
Input levels:
For 74HC423: CMOS level
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
3. Ordering information
Table 1. Ordering information
Type number Package
Temperature range Name
Description
Version
74HC423D 40 C to +125 C SO16
plastic small outline package; 16 leads;
body width 3.9 mm
SOT109-1
74HC423BQ 40 C to +125 C
DHVQFN16 plastic dual in-line compatible thermal enhanced very thin SOT763-1
quad flat package; no leads; 16 terminals;
body 2.5 3.5 0.85 mm




nexperia

74HC423BQ Datasheet Preview

74HC423BQ Datasheet

Dual retriggerable monostable multivibrator

No Preview Available !

Nexperia
4. Functional diagram
74HC423
Dual retriggerable monostable multivibrator with reset
$ 
% 
5' 
$ 
% 
5' 
Fig 1. Functional Diagram
6
4
7
4
5'
6
4
7
4
5'
 &(;7
 5(;7&(;7
 4
 4
 &(;7
 5(;7&(;7
 4
 4
DDK
 $
 $
 %
 %
 5'
 5'
Fig 2. Logic symbol
&(;7 
&(;7 
5(;7&(;7 
5(;7&(;7 
6
4
7
4
5'
4 
4 
4 
4 
DDK

&;

5&;





5

&;

5&;





5
DDK
Fig 3. IEC Logic symbol
74HC423
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 11 February 2016
.
2 of 19
© Nexperia B.V. 2017. All rights reserved


Part Number 74HC423BQ
Description Dual retriggerable monostable multivibrator
Maker nexperia
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