Dual Retriggerable Monostable Multivibrator IC - 74HC123
The 74HC Series 74HC123 is a 16 Pin Dual Retriggerable Monostable Multivibrator IC having 4.75V to 5.25V Operating Voltage with an output current of 8mA. It can generate output pulses from a few nano-seconds to extremely long duration up to 100% duty cycle. It contains internal timing resistors that allow the circuits to be used with only an external capacitor.
The 74HC123 contains two independent monostable multivibrators, each with two inputs and two outputs. When triggered, the output of the multivibrator goes high for a fixed period of time, after which it returns to its original state. The duration of the output pulse is determined by the values of an external resistor and capacitor connected to the IC.
check out : CD4538 - Dual Precision Monostable Multivibrator IC
Pinout:
Pinout Of 74HC123 IC