HGSEMI 74HC123LQ/TR

The 74HC123 are high-speed Si-gate CMOS devices and are pin compatible with Low-power Schottky TTL (LSTTL). The 74HC123 are dual retriggerable monostable multivibrators with output pulse width control by three methods:

1. The basic pulse is programmed by selection of an external resistor (R EX) and capacitor (C EXT).
2. Once triggered, the basic output pulse width may be extended by retriggering the gated active LOW-going edge input (n A) or the active HIGH-going edge input (nB). By repeating this process, the output pulse period (n Q = HIGH, n Q = LOW) can be made as long as desired. Alternatively an output delay can be terminated at any time by a LOW-going edge on input n R D, which also inhibits the triggering.
3. An internal connection from n R D to the input gates makes it possible to trigger the circuit by a HIGH-going signal at input n R D.

• DC triggered from active HIGH or active LOW inputs
• Retriggerable for very long pulses up to 100% duty factor
• Direct reset terminates output pulse
• Specified from -40 ℃ to +85 ℃
• Packaging information: DIP-16/SOP-16/TSSOP-16/QFN-16 3*3