DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

These edge-triggered multivibrators feature

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 output 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. The output pulse duration also can be

reduced by taking CLR

low.