74VHC221AN

Overview

The onsemi 74VHC221AN 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 provides two independent circuits, each featuring negative (A) and positive (B) transition triggered inputs, as well as a clear input for reset functionality. Output pulse width is determined by external resistor and capacitor values using the equation PW = Rx(Cx). Typical propagation delay is 8.1 ns at 5 V.

Feature Summary

• Dual non-retriggerable monostable multivibrator configuration
• Negative and positive transition triggered inputs per circuit
• Power-down protection provided on all inputs
• Pin and function compatible with 74HC221A

Applications

• Timing generation in digital systems
• Pulse width modulation circuits
• Debouncing switches
• Frequency division applications

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for specific ordering suffixes that may indicate tape and reel packaging versus tube packaging. Ensure the part number matches the exact logic family requirements for your design.

Selection Notes

Select this component when high-speed operation similar to Bipolar Schottky TTL is required alongside low power dissipation characteristics. Consider the 74VHC221AN for designs requiring interface between 5V and 3V systems due to its wide input voltage tolerance. Evaluate external timing components to ensure they meet minimum resistance limits based on the chosen supply voltage.

Part Context

This device belongs to the 74VHC series of high-speed CMOS logic devices. It maintains pinout compatibility with the older 74HC221A while offering improved speed performance. The 74VHC series is designed to bridge the gap between standard CMOS and faster logic families, providing robust noise immunity and low static power consumption.

Replacement Considerations

SN74LV221ANSR from Texas Instruments is listed as a direct substitute.