74HC423
description
The 74HC423 is a dual retriggerable monostable multivibrator with output pulse width control by two methods. The basic pulse time is programmed by selection of an external resistor (REXT) and capacitor (CEXT). Once triggered, the basic output pulse width may be extended by retriggering (n A) or (n B). By repeating this process, the output pulse period (n Q = HIGH, n Q = LOW) can be made as long as desired. When n RD is LOW, it forces the n Q output LOW, the n Q output HIGH and also inhibits the triggering. Schmitt-trigger action in the n A and n B inputs, makes the circuit highly tolerant to slower input rise and fall times. The '423' is identical to the '123' but cannot be triggered via the reset input. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.
2. Features and benefits
- DC triggered from active HIGH or active LOW inputs
- Retriggerable for very long pulses up to 100 % duty factor
- Direct...
