HD74HC221 Datasheet, PDF (1/8 Pages) Hitachi Semiconductor – Dual Monostable Multivibrators (with Schmitt Trigger Input)

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
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74HC221P
DILP-16 pin
PRDP0016AE-B _P
(DP-16FV)
HD74HC221FPEL SOP-16 pin (JEITA)
PRSP0016DH-B
(FP-16DAV)
FP
Note: Please consult the sales office for the above package availability.
Taping Abbreviation
(Quantity)
—
EL (2,000 pcs/reel)
Function Table
Inputs
Clear
A
B
L
X
X
X
H
X
X
X
L
H
L
H
H
L
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.
Outputs
Q
Q
L
H
L
H
L
H
Rev.2.00 Jan 31, 2006 page 1 of 7