74HC423 Datasheet, PDF (4/14 Pages) NXP Semiconductors – Dual retriggerable monostable multivibrator with reset

Philips Semiconductors
Dual retriggerable monostable
multivibrator with reset
Product specification
74HC/HCT423
Fig.4 Functional diagram.
FUNCTION TABLE
INPUTS
nR_D
nA
nB
L
X
X
X
H
X
X
X
L
H
L
↑
H
↓
H
Notes
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
OUTPUTS
nQ
nQ
L
H
L⁽²⁾
H⁽²⁾
L⁽²⁾
H⁽²⁾
= one LOW level output pulse
2. If the monostable was triggered before this condition was established, the pulse will continue as programmed.
1998 Jul 08
4