74HC684P-E

Overview

The 74HC684P-E is an 8-bit magnitude comparator manufactured by Renesas Electronics Corporation, belonging to the 74HC series. It performs comparisons of two eight-bit binary or BCD words, providing P=Q and P>Q outputs. The device utilizes CMOS technology in a 20-pin SOIC package. It supports a wide operating voltage range from 2V to 6V. Key electrical characteristics include high-speed operation, a fanout capability of 10 LSTTL loads, maximum input current of 1 µA, and a maximum static quiescent supply current of 4 µA at 25°C.

Feature Summary

• Performs magnitude comparison of two 8-bit binary or BCD words
• Provides dedicated P=Q and P>Q output signals
• Features high-speed operation with significant fanout capability
• Operates within a wide voltage range suitable for various logic families

Applications

• Digital systems requiring 8-bit data magnitude comparison
• Binary coded decimal (BCD) word comparison circuits
• Logic interfaces involving LSTTL load driving requirements

Procurement Notes

Verify the specific package variant, as the suffix 'P' typically denotes a plastic small outline package. Confirm RoHS compliance status directly with the manufacturer or authorized distributors, as environmental declarations may vary by production batch. Ensure the ordering information matches the exact part number including all suffixes to guarantee correct pinout and electrical specifications.

Selection Notes

Select this component when an 8-bit magnitude comparison function is required within a 74HC logic family design. It is suitable for applications needing both equality and greater-than outputs. Consider the 2V to 6V operating range for power supply compatibility. Verify that the 20-pin SOIC package fits the available board space and manufacturing capabilities.

Part Context

This component is part of the HD74HC682/HD74HC684 series of 8-bit magnitude comparators. The HD74HC682 variant includes internal pullup resistors on the Q inputs for analog or switch data handling, whereas the 74HC684 does not. Both share similar performance characteristics regarding speed and power consumption within the HC/UH series.

Replacement Considerations

The HD74HC682 is a related part within the same series but includes 20 kΩ pullup termination resistors on the Q inputs, which are absent in the 74HC684. Direct substitution requires verifying if the additional pullups affect the specific circuit design.