HD74HC221
Dual Monostable Multivibrators (with Schmitt Trigger Input)
REJ03D0591–0200
(Previous ADE-205-468)
Rev.2.00
Jan 31, 2006
Description
Each multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which can be used
as an inhibit. Also included is a clear input that when taken low resets the one shot. The HD74HC221 can be triggered
on the positive transition of the clear while A is held low and B is held high.
This device is a non-retriggerable, and therefore cannot be retriggered until the output pulse times out.
The output pulse equation is simply:
t
W
= 0.7·(Rext)·(Cext)
Features
•
•
•
•
•
•
High Speed Operation
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current
Ordering Information
Part Name
HD74HC221P
HD74HC221FPEL
Package Type
DILP-16 pin
SOP-16 pin (JEITA)
Package Code
(Previous Code)
PRDP0016AE-B
(DP-16FV)
Package
Abbreviation
P
—
EL (2,000 pcs/reel)
Taping Abbreviation
(Quantity)
PRSP0016DH-B
FP
(FP-16DAV)
Note: Please consult the sales office for the above package availability.
Function Table
Clear
L
X
X
H
H
H : high level (steady state)
L : low level (steady state)
X : don’t care
: transition from low to high level.
: transition from high to low level.
Inputs
A
X
H
X
L
L
Outputs
B
X
X
L
H
H
Q
L
L
L
Q
H
H
H
Rev.2.00 Jan 31, 2006 page 1 of 7
RENESAS [ RENESAS TECHNOLOGY CORP ]
