The MC74LS123D is a dual retriggerable monostable multivibrator with clear manufactured by Freescale Semiconductor - NXP. This device is part of the LS family of low-power Schottky TTL logic, providing two independent one-shot pulse generators with timing controlled by external resistors and capacitors.

Applications

• Timing circuits
• Pulse generation
• Delay circuits
• Missing pulse detectors
• Sequential timing

Features

• Retriggerable Operation: Output pulse is extended if triggered during the pulse duration
• Variable Pulse Width: Adjustable by external R and C components
• Clear Input: Allows asynchronous termination of the output pulse
• TTL Compatible Inputs and Outputs
• Low Power Consumption: ICC = 14 mA (max)
• Operating Voltage: 4.75 V to 5.25 V

Benefits

• Versatile Timing: Can generate a wide range of pulse widths.
• Retriggerable: Allows for pulse extension in response to continuous or intermittent triggers.
• Clear Input: Provides immediate termination of the output pulse.
• Dual One-Shot: Two independent timers in a single package.
• Simplified Design: External components provide precise timing control.

Additional Details

The MC74LS123D provides two independent monostable multivibrators. The output pulse width is determined by the external resistor (RT) and capacitor (CT) values connected to the timing pins. A low-going trigger pulse on the A input or a high-going trigger pulse on the B input initiates the timing cycle. The clear input, when low, terminates the output pulse. This device is typically found in a 16-Pin SOIC package. Storage temperature is -65°C to +150°C.