Dual Monostable Multivibrators
(Previous ADE-205-271D (Z))
Jun. 23, 2004
The HD74LV221A features output pulse-duration control by three methods. In the first method, the A input is low and
the B input goes high. In the second method, the B input is high and the A input goes low. In the third method, the A
input is low, the B input is high, and the clear (CLR) input goes high.
The basic pulse duration is programmed by selecting external resistance and capacitance values. The external timing
capacitor must be connected between Cext and Rext/Cext (positive) and an external resistor connected between
Rext/Cext and VCC.
To obtain variable pulse durations, connect an external variable resistance between Rext/Cext and VCC. Pulse duration
can be reduced by taking CLR low.
• VCC = 2.0 V to 5.5 V operation
• All inputs VIH (Max.) = 5.5 V (@VCC = 0 V to 5.5 V)
• All outputs VO (Max.) = 5.5 V (@VCC = 0 V)
• Output current ±6 mA (@VCC = 3.0 V to 3.6 V), ±12 mA (@VCC = 4.5 V to 5.5 V)
• Ordering Information
SOP–16 pin (JEITA) FP–16DAV
SOP–16 pin (JEDEC) FP–16DNV
Note: Please consult the sales office for the above package availability.
EL (2,000 pcs/reel)
EL (2,500 pcs/reel)
ELL (2,000 pcs/reel)
Note: H: High level
L: Low level
↑: Low to high transition
↓: High to low transition
: High level pulse
: Low level pulse
Rev.6.00 Jun. 23, 2004 page 1 of 13