74HC85D,652

Comparators Overview

The Nexperia 74HC85D,652 is a 4-bit magnitude comparator in the 74HC series. It compares two 4-bit binary, BCD, or monotonic codes to determine magnitude relationships. The device provides three active-high outputs indicating A>B, A=B, and A<B conditions. It supports expansion for multi-bit comparisons via dedicated cascade inputs. Operating from a supply voltage range of 2.0 V to 6.0 V, it features CMOS low power dissipation and high noise immunity. The component is housed in a 16-pin SOIC package.

Comparators Feature Summary

• Performs comparison of two 4-bit binary, BCD, or other monotonic codes
• Provides three distinct magnitude result outputs for A>B, A=B, and A<B
• Supports cascading for expansion to larger bit widths using expander inputs
• Features input clamp diodes for interfacing with voltages exceeding VCC

Comparators Applications

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

Comparators Procurement Notes

Verify the specific suffix 652 against official Nexperia documentation to confirm packaging and tape-and-reel specifications. Ensure compatibility with system voltage requirements within the 2.0 V to 6.0 V operating range. Confirm that the SOIC-16 package dimensions meet PCB layout constraints. Check for any recent product change notices regarding marking or assembly updates.

Comparators 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 dedicated cascade pins. Consider the wide supply voltage range and high noise immunity for robust operation. Verify that the HC logic family voltage levels align with the rest of the system interface requirements.

Comparators Part Context

This part belongs to the 74HC (High-speed CMOS) logic family manufactured by Nexperia. The 74HC85 series specifically addresses magnitude comparison needs in digital electronics. It complies with JEDEC standards JESD8C and JESD7A for voltage ranges. The device offers latch-up performance exceeding 100 mA per JESD 78 Class II Level B.

Comparators FAQ

How are the expander inputs configured for proper comparison operation?

For proper comparison, the expander inputs at the least significant position must be connected as follows: I_A<B and I_A>B should be LOW, and I_A=B should be HIGH.

Can this comparator be expanded to compare words greater than 4 bits?

Yes, units can be cascaded by connecting the outputs Q_A>B, Q_A=B, and Q_A<B to the corresponding expander inputs of the more significant comparator.