Dual Monostable Multivibrators (with Schmitt Trigger Input)
Jan 31, 2006
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:
tW = 0.7·(Rext)·(Cext)
• High Speed Operation
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current
• Ordering Information
HD74HC221FPEL SOP-16 pin (JEITA)
Note: Please consult the sales office for the above package availability.
EL (2,000 pcs/reel)
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.
Rev.2.00 Jan 31, 2006 page 1 of 7