STMicroelectronics M74HC123TTR Dual Retriggerable Monostable Multivibrator

The M74HC123TTR is a high-speed CMOS dual retriggerable monostable multivibrator fabricated with silicon gate C2MOS technology from STMicroelectronics. This integrated circuit is designed to produce precise timing pulses and has the capability to be retriggered, making it an ideal choice for a wide range of timing, pulse shaping, and delay applications in digital systems.

Each multivibrator of the M74HC123TTR features an active LOW trigger input (A), an active HIGH trigger input (B), an overriding active LOW direct clear input (CLR), a complementary output (Q and Q̅), and an external timing component connection for the RC network (Rext and Cext). The timing period is controlled by the external resistor and capacitor, offering flexibility and precision for the desired pulse width.

The device operates over a broad VCC range from 2V to 6V and offers symmetrical output impedance along with high noise immunity and low power consumption. These characteristics make the M74HC123TTR suitable for interfacing with TTL and CMOS logic levels. Additionally, its balanced propagation delays for all inputs provide consistent high-speed operation.

Available in a TSSOP16 package, the M74HC123TTR ensures a reduced footprint on printed circuit boards, facilitating compact and efficient designs. Its compliance with JEDEC standard no. 7A and the ability to drive 50pF loads without significant degradation in performance further enhance its utility in digital circuits.

Key features of the M74HC123TTR include:

• High-speed operation: fMAX = 80MHz (typ) at VCC = 5V
• Low power dissipation: ICC = 4µA (max) at TA = 25°C
• Two completely independent circuits with retriggerable capability
• Wide operating voltage range: VCC (opr) = 2V to 6V
• Pin and function compatible with 74 series 123
• ESD performance: HBM > 1KV; MM > 200V

Whether used in communication devices, instrumentation, microprocessor systems, or digital signal processing, the M74HC123TTR from STMicroelectronics provides reliability and performance for your critical timing applications.