BUY 74121N https://www.utsource.net/itm/p/1741955.html

Description: The 74121N is a monostable multivibrator with a retriggerable output. Features: High Accuracy Triggering: 0.5% Low Power Consumption: 10μA Max High Output Current: 25mA Wide Operating Voltage Range: 2V to 18V Retriggerable Output Applications: Pulse Generation Time Delay Generation Pulse Width Modulation Frequency Division Pulse Position Modulation Pulse Stretching (For reference only)