CD74HCT280E

Overview

The CD74HCT280E is a single 9-bit odd/even parity generator and checker from the HCT logic series, manufactured by Harris Corporation. It operates within a supply voltage range of 4.5 V to 5.5 V and features complementary outputs for parity status indication. The device is housed in a PDIP-14 package and supports an operating temperature range from -55 °C to +125 °C. Key electrical specifications include a propagation delay of 45 ns, with output drive capabilities of -4 mA at high level and 4 mA at low level.

Feature Summary

• Performs 9-bit odd or even parity generation and checking functions
• Provides complementary outputs indicating parity status
• Compatible with standard CMOS logic families via HCT input structure

Applications

• Data integrity verification in digital communication systems
• Memory error detection circuits
• Parity checking in microprocessor-based data buses

Procurement Notes

Verify manufacturer origin as Harris Corporation, noting that Texas Instruments acquired Harris Semiconductor assets. Confirm package type is PDIP-14 and check RoHS compliance status, as older Harris production may differ from current TI standards. Ensure the specific part number matches the HCT series requirements for your system voltage levels.

Selection Notes

Select this component when a 9-bit parity solution is required with wide industrial temperature tolerance. The HCT series ensures compatibility with TTL-driven systems while maintaining CMOS power efficiency. Verify that the 45 ns propagation delay meets the timing constraints of the target application bus speed.

Part Context

This component belongs to the CD74HCTxx family of logic integrated circuits. Originally produced by Harris Semiconductor before its acquisition by Texas Instruments, these parts are widely used in legacy and industrial designs requiring robust parity checking capabilities across extreme environmental conditions.

Replacement Considerations

CD74HC280E96 (Renesas) offers similar functionality but with a slower 300 ns propagation delay. Other HCT-series equivalents from different manufacturers may be considered if pin compatibility and electrical characteristics align with the original Harris specification.