M74HC85B1R

Comparators Overview

The M74HC85B1R is a high-speed CMOS 4-bit magnitude comparator fabricated using silicon gate C2MOS technology. It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range from -55 °C to +125 °C. The device features asynchronous reset functionality and is housed in a 16-pin PDIP package designed for through-hole installation. Typical propagation delay is specified at 20 ns or 22 ns depending on the specific datasheet revision.

Comparators Feature Summary

• Performs high-speed digital magnitude comparison between two 4-bit binary words
• Utilizes silicon gate C2MOS technology for low power consumption and high noise immunity
• Supports cascading operations via dedicated expansion inputs for multi-bit comparisons

Comparators Applications

• Digital arithmetic logic units requiring magnitude decision functions
• Address decoding systems comparing input addresses against set values
• Control logic circuits evaluating sensor data thresholds

Comparators Procurement Notes

Verify component authenticity by checking manufacturer markings and datasheet alignment. Confirm package integrity and pin configuration match the 16-pin DIP specification. Ensure environmental compliance documentation matches project requirements. Validate that the specific suffix corresponds to the intended packaging format before finalizing orders.

Comparators Selection Notes

Select this component when a 4-bit comparison function is required with wide voltage flexibility. The HC series offers compatibility with standard CMOS logic families. Consider the operating temperature range if the application involves extreme environmental conditions. Verify pinout compatibility with existing PCB layouts before integration.

Comparators Part Context

This part belongs to the STMicroelectronics M74HC family of high-speed CMOS logic devices. The M74HC85 series specifically provides magnitude comparison capabilities. It is distinct from multiplexers like the M74HC257 or shift registers like the M74HC164. The B1R suffix typically indicates a specific tape and reel or tube packaging variant within the broader product line.

Comparators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.