MM74HC280MX

Overview

The MM74HC280MX is a high-speed silicon-gate CMOS logic device manufactured by onsemi, functioning as a 9-bit odd/even parity generator and checker. It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range from -40 °C to +85 °C. The component features a propagation delay of 20 ns and provides standard output capability with low input current. It is housed in a 14-pin SOIC-Narrow package, designed for surface-mount installation.

Feature Summary

• Generates or checks odd or even parity for nine data bits
• Word-length expansion through cascading capability
• Pin-compatible with low power Schottky TTL (LSTTL)
• High-speed silicon-gate CMOS technology

Applications

• 25-line parity generator/checker systems
• 81-line parity generator/checker configurations
• Digital communication error detection circuits

Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor was acquired by onsemi. Ensure the datasheet corresponds to the current onsemi specification for the MM74HC280 series. Confirm the suffix 'MX' aligns with the required SOIC-14 package and tape-and-reel packaging format for your assembly process. Cross-reference RoHS compliance status with the latest product change notifications.

Selection Notes

Select this component when a 9-bit parity solution is required that maintains compatibility with legacy LSTTL pinouts. The HC series offers higher speed than standard 74HC devices while maintaining CMOS power efficiency. Consider the 2V to 6V supply range flexibility for mixed-voltage systems. Verify that the 20 ns propagation delay meets the timing requirements of the target application bus speeds.

Part Context

This part belongs to the 74HC280 family of parity generators and checkers. It serves as a digital logic interface for ensuring data integrity in multi-bit transmission lines. The device simplifies system design by integrating parity calculation directly into the signal path without requiring external microcontroller intervention for basic error checking functions.

Replacement Considerations

Direct substitutes include the 74HC280D from Nexperia and the CD74AC280 from Texas Instruments. These alternatives share the same logical function and pinout but may differ in specific electrical characteristics such as propagation delay or supply voltage limits. Verify package dimensions and thermal performance before substitution.