SN74LS280D

Overview

The SN74LS280D is a Universal 9-Bit Parity Generator/Checker from the Low Power Schottky (LS) logic family. It provides complementary odd and even parity outputs to facilitate either parity scheme. The device features buffered inputs that lower drive requirements to one LS unit load. Designed for cascading, it allows word length expansion. It serves as a direct substitute for the LS180, offering improved performance characteristics.

Feature Summary

• Generates odd or even parity for nine data lines
• Provides complementary odd/even outputs
• Cascadable for n-bit expansion
• Buffered inputs reduce drive requirements

Applications

• Data transmission error detection systems
• Memory system parity checking
• Upgrading systems using MSI parity circuits
• Universal parity generation and checking

Procurement Notes

Verify the manufacturer designation carefully, as the part number prefix 'SN' typically indicates Texas Instruments production, while the brand specified is onsemi. Confirm the datasheet source matches the actual component origin. Ensure the package type and pinout align with the specific design requirements before procurement.

Selection Notes

Select this component when a 9-bit parity solution is required within Low Power Schottky logic constraints. It is suitable for designs needing both odd and even parity outputs simultaneously. Consider its compatibility with existing TTL logic levels and its ability to replace older MSI parity circuits like the LS180 for performance improvements.

Part Context

This component belongs to the 74LS series of integrated circuits, known for low power consumption and high speed relative to standard TTL. It functions as a specialized logic gate dedicated to parity operations, distinct from general-purpose gates. The 'D' suffix denotes a surface-mount package variant.

Replacement Considerations

The SN74LS280 can be substituted for the SN74LS180. Verify pin compatibility and electrical specifications against the original circuit design to ensure seamless integration without hardware modifications.