Philips Semiconductors
Product specification
Dual non-retriggerable monostable
multivibrator with reset
AC WAVEFORMS
74HC/HCT221
Fig.7 Output pulse control; nR
D
= HIGH.
(1) HC : V
M
= V
M
= 50%; V
I
= GND to V
CC
.
HCT : V
M
= V
M
= 1.3 V; V
I
= GND to 3 V.
Fig.8
Output pulse control using reset input nR
D
;
nA = LOW.
Fig.10 Waveforms showing the triggering of One
Shot by input nA or input nB for one period
(t
W
) and minimum pulse widths of the trigger
inputs nA and nB.
(1) HC : V
M
= V
M
= 50%; V
I
= GND to V
CC
.
HCT : V
M
= V
M
= 1.3 V; V
I
= GND to 3 V.
(1) HC : V
M
= V
M
= 50%; V
I
= GND to V
CC
.
HCT : V
M
= V
M
= 1.3 V; V
I
= GND to 3 V.
Fig.9
Waveforms showing the removal times;
nR
D
to nA or nB.
11
Fig.11 Waveforms showing the reset to nQ and nQ
output propagation delays.
December 1990
PHILIPS [ NXP SEMICONDUCTORS ]
