74HC123M

The 74HC123M is a versatile dual retriggerable monostable multivibrator IC manufactured by Texas Instruments. This component is designed to generate output pulses with durations determined by external R and C components, following the formula Tвых=R*C. Each of the two monostable multivibrators within the 74HC123M features both a non-inverted (Q) and an inverted (_Q) output, a low-active reset input (CLR), and two trigger inputs: a direct (B) and an inverted (A).

The device supports a wide operating voltage range from 2V to 6V. It offers a maximum output current of 25mA for a logic '0' state and a minimum output voltage greater than Vcc-0.1V for a logic '1' state. The operating temperature range is specified from -40°C to +85°C, making it suitable for various environmental conditions. The 74HC123M is available in two common package types: DIP-16 for through-hole mounting and SO-16 for surface mounting.

This integrated circuit is compatible with other standard CMOS logic ICs in terms of input and output signal levels. The retriggerable nature allows the output pulse duration to be extended by applying a new voltage transition to the trigger input while the pulse is active. Conversely, the output pulse can be terminated prematurely by applying a low-level voltage to the reset input. When both multivibrators are connected in a ring configuration, they can function as an astable multivibrator.