The TC74HC123AF(ELNEW) is a high-speed CMOS dual retriggerable monostable multivibrator. This device provides two independent one-shot pulses when triggered. The output pulse width is determined by the external timing components, R<sub>EXT and C<sub>EXT. The device features a wide operating voltage range and high noise immunity, making it suitable for various timing and pulse generation applications.

Applications

• Timing circuits
• Pulse generation
• Delay circuits
• Missing pulse detection
• Pulse width modulation
• Time delay applications

Features

• Dual monostable multivibrator
• Retriggerable operation
• High-speed CMOS logic
• Wide operating voltage range (2V to 6V)
• Low power consumption
• High noise immunity
• Schmitt-trigger inputs

Benefits

• Provides two independent timing functions in a single package.
• Retriggerable operation allows for extending the output pulse width.
• High-speed operation enables precise timing control.
• Wide operating voltage range provides flexibility in system design.
• Low power consumption minimizes power requirements.
• High noise immunity ensures reliable operation in noisy environments.

Additional Details

The TC74HC123AF(ELNEW) utilizes external resistors and capacitors to determine the output pulse width. The pulse width can be calculated using the formula: Pulse Width ≈ R<sub>EXT * C<sub>EXT. The device features clear (CLR) and trigger (A, B) inputs for controlling the output pulses. The CLR input, when low, terminates the output pulse. The A input is triggered by a positive-going transition, while the B input is triggered by a negative-going transition. The device is available in a SOIC package.

This device is commonly used in applications requiring precise timing, pulse shaping, or delay functions. The retriggerable feature makes it particularly useful in missing pulse detection applications, where the output pulse is maintained as long as input pulses are received within a certain time interval.