74HC280D,653

Overview

The Nexperia 74HC280D,653 is a 9-bit odd/even parity generator and checker housed in a 14-SO plastic small outline package (SOT108-1). It operates on a supply voltage range of 2.0 V to 6.0 V with an operating temperature range from -40 °C to +125 °C. The device provides complementary even parity output (PE) and odd parity output (PO), where PE is HIGH when an even number of data inputs are HIGH, and PO is HIGH when an odd number are HIGH. It features input clamp diodes for interfacing with voltages exceeding VCC.

Feature Summary

• Generates or checks both odd and even parity for nine data bits simultaneously
• Word-length expansion capability achieved by cascading multiple devices
• High noise immunity and low power CMOS dissipation characteristics

Applications

• Data transmission systems requiring parity verification
• Memory modules utilizing error detection protocols
• Digital communication interfaces ensuring data integrity

Procurement Notes

Verify the specific ordering suffix matches the required package type, as the base part number covers multiple variants. Confirm that the component meets RoHS3 compliance standards and JESD78 Class II Level B latch-up performance requirements before finalizing procurement specifications.

Selection Notes

Select this component when a 9-bit parity solution is required within standard logic families. Ensure the system voltage falls within the 2.0 V to 6.0 V range. Consider the 14-SO package dimensions if board space is constrained, and verify that the input levels align with the CMOS specifications of the driving circuitry.

Part Context

This component belongs to the 74HC series of high-speed CMOS logic devices manufactured by Nexperia. It serves as a specialized functional block for digital signal processing tasks involving error checking. The device is designed to integrate seamlessly into broader logic circuits requiring robust parity generation capabilities.

Replacement Considerations

Direct replacements include the 74HCT280D variant for TTL-compatible input levels. Other manufacturers may offer equivalent 9-bit parity generators, but pinout and electrical characteristics must be verified against the official datasheet.

FAQ

How does the 74HC280D handle word lengths larger than 9 bits?

Larger word sizes are supported by cascading up to nine parallel devices. This is accomplished by connecting the even parity outputs (PE) of preceding stages to the data inputs of the final stage.

What is the function of the input clamp diodes?

The input clamp diodes allow the use of current-limiting resistors to interface the inputs to voltages that exceed the supply voltage (VCC).