The TC74HC423AP is a high-speed CMOS dual retriggerable monostable multivibrator. Each multivibrator features a clear input and a trigger input, allowing for a variety of pulse generation applications. Its retriggerable capability extends the output pulse width when triggered again before the timeout period ends.

Applications:

• Timers
• Pulse generators
• Missing pulse detectors
• Frequency dividers
• Contact debouncing

Features:

• High-speed operation
• Dual monostable multivibrators in a single package
• Retriggerable capability
• Clear input for asynchronous reset
• Wide operating voltage range: 2V to 6V
• Low power dissipation
• Schmitt-trigger action on trigger inputs for improved noise immunity

Benefits:

• Reduced component count and board space due to dual multivibrators in one package.
• Flexible pulse width control through external resistor and capacitor.
• Stable output pulse width, even with variations in supply voltage and temperature.
• Simplified system design with the clear input for asynchronous reset.
• High noise immunity due to Schmitt-trigger inputs.
• Low power consumption for energy-efficient applications.
• Ability to detect missing pulses in digital systems.

Additional Details:

The TC74HC423AP requires an external resistor (Rext) and capacitor (Cext) to set the output pulse width. The pulse width is approximately equal to Rext * Cext. The device operates over the temperature range of -40°C to +85°C. The clear input, when low, forces the output to a low state, regardless of the trigger input. The trigger input is edge-triggered; a low-to-high transition triggers the monostable. Retriggering occurs if another trigger pulse arrives before the original output pulse times out, extending the output pulse width. The device is available in DIP and SOIC packages. The Schmitt-trigger inputs provide excellent noise immunity, making the device suitable for noisy environments. It is often used in industrial control systems, timing circuits, and other applications requiring precise pulse generation.