74VHC221ASJX

Overview

The onsemi 74VHC221ASJX is a dual non-retriggerable monostable multivibrator fabricated with advanced silicon gate CMOS technology. It operates within a supply voltage range of 2.0 V to 5.5 V and supports an operating temperature range of -40°C to +85°C. The device features two independent circuits, each providing both negative (A) and positive (B) transition triggered inputs, along with a clear input for reset functionality. Propagation delay is typically 8.1 ns at VCC = 5 V. Output drive capability includes ±8 mA current levels. The 'X' suffix indicates tape and reel packaging.

Feature Summary

• Dual non-retriggerable monostable multivibrator architecture
• Negative and positive transition trigger inputs per circuit
• Active state power down protection on all inputs
• Pin and function compatible with 74HC221A

Applications

• Timing pulse generation
• Debouncing switches
• Pulse width modulation
• Timer applications

Procurement Notes

Verify the specific ordering code against the manufacturer's official documentation to confirm package type and revision status. Ensure that the application environment remains within the recommended operating conditions regarding supply voltage and temperature limits. Confirm compatibility with existing PCB footprints if replacing legacy components. Check for any updated compliance or material composition statements prior to final procurement decisions.

Selection Notes

Select this component when high-speed operation similar to Bipolar Schottky TTL is required alongside low CMOS power dissipation. Consider the device for interfacing between 5V and 3V systems due to its input protection circuit allowing 0 to 7V input tolerance. Evaluate the external resistor and capacitor requirements to determine the precise output pulse width needed for the specific timing application.

Part Context

This part belongs to the 74VHC series of logic integrated circuits, which are designed for high-speed applications. The 74VHC221A specifically provides dual monostable multivibrator functions in a single package. It maintains compatibility with previous generations like the 74HC221A while offering improved speed characteristics typical of the VHC family.

Replacement Considerations

Direct substitutes include parts from other manufacturers that match the 74VHC221A logical function and pinout. Verify that any replacement component meets the same electrical specifications, particularly propagation delay and supply voltage ranges, to ensure system compatibility.