The TC74HC4538AFN is a high-speed CMOS dual retriggerable precision monostable multivibrator manufactured by Toshiba Semiconductor and Storage. This device utilizes advanced silicon-gate CMOS technology to achieve high-speed operation combined with CMOS low power consumption. Each multivibrator features a negative transition triggered input (A) and a positive transition triggered input (B), allowing for versatile triggering options. The clear input (CLR) permits the device to be reset, terminating the output pulse width.

Applications

• Timing circuits
• Pulse delay circuits
• Pulse stretching circuits
• Missing pulse detection
• Frequency discrimination
• Sequential timing

Features

• High-Speed Operation: tpd = 16 ns (typ.) at VCC = 5V
• Low Power Dissipation: ICC = 4 µA (max.) at VCC = 5V
• Wide Operating Voltage Range: VCC = 2 to 6 V
• High Noise Immunity: VNIH = VNIL = 28 % VCC (min.)
• Symmetrical Output Impedance: |IOH| = IOL = 4 mA (min.)
• Balanced Propagation Delays: tPLH ≈ tPHL
• Retriggerable capability
• Clear function to terminate the output pulse

Benefits

• Precise timing control in various applications due to the stable and accurate pulse width generation.
• Reduced power consumption making it suitable for battery-powered and energy-efficient systems.
• Reliable operation across a wide range of voltage levels, increasing design flexibility.
• Improved noise performance ensures consistent behavior in noisy environments.
• Simplified system design with symmetrical output impedance and propagation delays, minimizing signal distortion.
• Versatile triggering options with both positive and negative edge triggering inputs.

Additional Details

The TC74HC4538AFN comes in a surface-mount package (SO-16). The output pulse width is determined by the external timing components, resistor (RT) and capacitor (CT). The device is temperature rated for industrial applications. The device is commonly used in applications requiring precise and adjustable timing intervals.