74HC85D,653

Overview

The Nexperia 74HC85D,653 is a 4-bit magnitude comparator housed in a 16-SO package. It compares two 4-bit binary or BCD codes to determine if input A is greater than, less than, or equal to input B. The device operates on a supply voltage range of 2 V to 6 V with a maximum quiescent current of 8 µA. Propagation delays are specified at 33 ns (6 V), 39 ns, and 195 ns depending on conditions. It supports surface mount installation and functions within an operating temperature range of -40 °C to +125 °C.

Feature Summary

• Performs magnitude comparison of two 4-bit binary, BCD, or monotonic codes
• Provides three distinct output states indicating A>B, A=B, or A<B relationships
• Supports cascading expansion for comparing words longer than 4 bits via dedicated expander inputs
• Features high noise immunity and latch-up performance exceeding 100 mA per JESD 78 Class II Level B

Applications

• Process controllers
• Servo-motor control systems
• Digital logic circuits requiring magnitude decision making

Procurement Notes

Verify the specific suffix '653' corresponds to the SO-16 package and reel/cut-tape availability when ordering. Confirm RoHS compliance status as indicated in official documentation. Ensure interface voltages align with CMOS level requirements for the HC series. Check manufacturing lead times as they may vary based on production schedules.

Selection Notes

Select this component when a 4-bit magnitude comparison function is required in CMOS logic designs. It is suitable for applications needing expansion capabilities through cascading outputs. Consider the 16-SO package for surface mount assembly constraints. Verify that the operating voltage range of 2 V to 6 V matches the system power supply.

Part Context

This part belongs to the Nexperia 74HC family of high-speed CMOS logic devices. The 74HC85 series specifically addresses magnitude comparison needs. It complies with JEDEC standards JESD8C and JESD7A. The device includes clamp diodes on inputs to allow interfacing with voltages exceeding VCC using current-limiting resistors.

Replacement Considerations

Compatible substitutes include other 4-bit magnitude comparators from the 74HC85 series. Cross-reference pinouts and electrical characteristics before substitution. Ensure equivalent propagation delay and supply voltage ranges match design requirements.