74HCT280D,653

Overview

The Nexperia 74HCT280D,653 is a 9-bit odd/even parity generator and checker housed in an SOIC-14 (SOT108-1) package. It operates within a supply voltage range of 4.5 V to 5.5 V. The device features TTL-compatible input levels and provides separate outputs for even (PE) and odd (PO) parity states. Static characteristics specify a maximum low-level output current of 4.0 mA at 4.5 V. Dynamic performance includes a typical propagation delay of 21 ns from input to PE and 26 ns from input to PO at 4.5 V.

Feature Summary

• Generates or checks both even and odd parity for nine data bits simultaneously
• Supports cascading expansion to larger word sizes by connecting parallel devices
• Features clamp diodes on inputs to allow interfacing with voltages exceeding VCC

Applications

• Data transmission systems requiring parity verification
• Memory modules utilizing error detection protocols
• Digital logic circuits implementing 9-bit data integrity checks

Procurement Notes

Verify the specific suffix '653' corresponds to the SOIC-14 plastic small outline package (SOT108-1). Confirm that the HCT designation ensures compatibility with TTL logic levels required by the target system interface. Ensure environmental specifications meet the -40 °C to +125 °C operating temperature range necessary for the application environment.

Selection Notes

Select this component when a 9-bit parity solution is required with TTL input thresholds. The wide supply voltage range allows flexibility in power distribution networks. Consider the SOIC-14 package dimensions for PCB layout constraints. Verify that the propagation delay meets the timing requirements of the data bus speed.

Part Context

This part belongs to the 74HCT series of high-speed CMOS logic devices manufactured by Nexperia. It functions as a single-function gate specialized for parity generation and checking. The device is designed for applications requiring robust noise immunity and low power dissipation while maintaining compatibility with standard TTL logic families.

Replacement Considerations

The 74HC280D,653 serves as a functional equivalent but utilizes CMOS input levels rather than TTL levels. Designers must ensure input voltage thresholds match the source logic family before substitution.