74HC221D NXP Semiconductors, 74HC221D Datasheet - Page 4

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74HC221D

Manufacturer Part Number
74HC221D
Description
IC, 74HC CMOS, SMD, 74HC221, SOIC16
Manufacturer
NXP Semiconductors
Datasheet

Specifications of 74HC221D

Multivibrator Type
Non Retriggerable Monostable
Output Current
5.2mA
Logic Case Style
SOIC
No. Of Pins
16
Supply Voltage Range
2V To 6V
Operating Temperature
RoHS Compliant
Propagation Delay
21ns
Philips Semiconductors
December 1990
Dual non-retriggerable monostable
multivibrator with reset
Fig.4 Functional diagram.
4
FUNCTION TABLE
Notes
1. H = HIGH voltage level
2. If the monostable was triggered before this condition
3. For this combination the reset input must be LOW and
nR
L = LOW voltage level
X = don’t care
was established the pulse will continue as
programmed.
the following sequence must be used:
pin 1 (or 9) must be set HIGH or pin 2 (or 10) set LOW;
then pin 1 (or 9) must be LOW and pin 2 (or 10) set
HIGH. Now the reset input goes from LOW-to-HIGH
and the device will be triggered.
H
H
L
X
X
= LOW-to-HIGH level
= HIGH-to-LOW level
D
= one HIGH-level output pulse
= one LOW-level output pulse
INPUTS
nA
X
X
H
L
L
nB
X
X
H
H
L
74HC/HCT221
nQ
L
L
L
Product specification
(2)
(2)
OUTPUTS
(3)
nQ
H
H
H
(2)
(2)
(3)

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