74HC221DB,112

Overview

The 74HC221DB,112 is a dual non-retriggerable monostable multivibrator manufactured by NXP USA Inc. It belongs to the HC (High-speed CMOS) logic family and operates within a supply voltage range of 2 V to 6 V. The device features two independent monostable circuits, each with active LOW-going edge input (nA) and active HIGH-going edge input (nB). It utilizes an external resistor and capacitor for pulse width setting and includes an overriding reset function to terminate output pulses. The component is housed in a 16-pin SSOP package.

Feature Summary

• Dual non-retriggerable monostable multivibrator architecture
• Active LOW-going edge input (nA) and active HIGH-going edge input (nB)
• Overriding reset function terminates output pulse
• External timing components for pulse width control

Applications

• Pulse generation and shaping
• Timing delays
• Debouncing switches
• Frequency division

Procurement Notes

Verify the exact ordering code 74HC221DB,112 against official NXP documentation to ensure compatibility with the SSOP-16 package and HC series specifications. Confirm RoHS compliance status and check for any specific handling requirements related to ESD protection during assembly. Ensure the design supports the required external RC timing network configuration.

Selection Notes

Select this component when a dual non-retriggerable monostable multivibrator is required in a high-speed CMOS environment. It is suitable for designs needing precise timing intervals controlled by external resistors and capacitors. Consider the operating temperature range and supply voltage constraints of the target application to ensure reliable performance within the specified limits.

Part Context

This part is part of the widely used 74HC series of high-speed Si-gate CMOS logic devices. These devices are pin-compatible with low-power Schottky TTL (LSTTL) standards, facilitating easy upgrades from older logic families. The 74HC221 specifically addresses applications requiring stable single-shot pulse generation without retriggering capabilities.

Replacement Considerations

Compatible substitutes include the 74HCT221D for TTL-compatible input levels. Other generic equivalents may exist but require verification of pinout and electrical characteristics against the original datasheet.