74HC123D,653-JSM

The 74HC/HCT123 are high-speed silicon gate CMOS devices with pin compatibility with Low-power Schottky TTL (LSTTL). The 74HC/HCT123 are dual retriggerable monostable multivibrators with output pulse width controlled by three methods: 1. The basic pulse is programmed by selecting external resistance (REXT) and capacitance (CEXT). 2. Once triggered, the basic output pulse width can be extended by retriggering via the active falling-edge input (nA) or active rising-edge input (nB). By repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made as long as desired. Alternatively, the output timing can be terminated at any time by a low-level transition on input nRD, which inhibits triggering. 3. The internal connection from nRD to the input gate makes it possible for a HIGH signal at input nRD to trigger the circuit.

Key features

• Retriggerable, suitable for very long pulses with duty cycle up to 100%
• Direct reset to terminate output pulse
• Operating temperature range: -40℃ ~ +125℃
• Package: DIP16/SOP16/TSSOP16