Dual Retriggerable Monostable Multivibrators
(Previous ADE-205-258D (Z))
Jun. 02, 2004
The HD74LV123A 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.
Once triggered, the basic pulse duration can be extended by retriggering the gated low-level-active (A) or high-level-
active (B) input. 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)
Rev.6.00 Jun. 02, 2004 page 1 of 15