SN74LS280M

Overview

The onsemi SN74LS280M is a Low Power Schottky (LS) TTL integrated circuit functioning as a universal 9-bit parity generator and checker. It provides complementary odd and even parity outputs for nine data lines, enabling flexible system configuration. The device features buffered inputs to reduce drive requirements and supports cascading for expanded word lengths. It operates within a standard 4.75V to 5.25V supply voltage range and utilizes a 14-SOIC surface-mount package.

Feature Summary

• Generates or checks odd and even parity for nine independent data lines simultaneously
• Provides complementary outputs to facilitate either odd or even parity selection without external logic
• Designed with buffered inputs to lower drive requirements to one LS unit load
• Supports cascading configurations to expand parity checking capabilities beyond nine bits

Applications

• Universal 9-bit parity generation and checking in digital systems
• Cascaded multi-bit parity verification circuits
• System upgrades replacing MSI parity circuits such as the LS180

Procurement Notes

Verify the specific manufacturer designation carefully, as the SN74LS280 part number is historically associated with Texas Instruments. Confirm that the onsemi variant matches the required pinout and electrical characteristics for your design. Check RoHS compliance status and lead times due to potential end-of-life or legacy status of this logic family component.

Selection Notes

Select this component when a 9-bit parity solution is required with low power consumption typical of the LS series. Ensure the design accommodates the 33ns typical propagation delay. Consider the 14-SOIC package constraints for PCB layout. Verify compatibility with existing TTL logic levels and supply voltage stability within the specified range.

Part Context

This component belongs to the 74LS logic family, known for low power dissipation compared to standard TTL. It serves as a direct functional replacement for older MSI parity circuits like the 74LS180, offering improved performance through buffered inputs and standardized packaging. It is widely used in legacy industrial and computing applications requiring reliable parity error detection.

Replacement Considerations

Direct substitutes include other manufacturers' 74LS280 variants. Verify pin compatibility and electrical specifications before substitution.