Description

The 74HC123 IC is designed as dual retriggerable monostable multivibrators, offering versatile output pulse width control through three methods:

Basic Pulse Programming: The output pulse width is determined by selecting an external resistor (REXT) and capacitor (CEXT).

Pulse Extension: The basic output pulse width can be extended by retriggering the gated active LOW-going edge input (nA) or the active HIGH-going edge input (nB). By repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be prolonged indefinitely. An output delay can be terminated at any time by a LOW-going edge on input nRD, which also inhibits further triggering.

Triggering via Reset Input: An internal connection from nRD to the input gates allows the circuit to be triggered by a HIGH-going signal at input nRD, as shown in the function table.

The Schmitt-trigger action on the nA and nB inputs makes the circuit highly tolerant to slower input rise and fall times.

Highlights

Specifications:

Package Includes:

Note: Product images are for illustrative purposes only and may differ from the actual product.

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