74HC85PW,112 View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

74HC85PW,112

4-bit magnitude comparator

NXP Semiconductors. 

74HC85; 74HCT85

4-bit magnitude comparator

Rev. 3 — 20 April 2018

Product data sheet

1 General description

The 74HC85; 74HCT85 is a 4-bit magnitude comparator that can be expanded to almost

any length. They perform comparison of two 4-bit binary, BCD or other monotonic codes

and present the three possible magnitude results at the outputs (QA>B, QA=B and QA<B).

The 4-bit inputs are weighted (A0 to A3 and B0 to B3), where A3 and B3 are the most

significant bits. For proper compare operation the expander inputs (IA>B, IA=B and IA<B)

to the least significant position must be connected as follows: IA<B = IA>B = LOW

and IA=B = HIGH. For words greater than 4-bits, units can be cascaded by connecting

outputs QA>B, QA=B and QA<B to the corresponding inputs of the significant comparator.

Inputs include clamp diodes. This enables the use of current limiting resistors to interface

inputs to voltages in excess of VCC.

2 Features and benefits

• Wide supply voltage range from 2.0 to 6.0 V

• CMOS low power dissipation

• High noise immunity

• Latch-up performance exceeds 100 mA per JESD 78 Class II Level B

• Input levels:

– For 74HC85: CMOS level

– For 74HCT85: TTL level

• Complies with JEDEC standard: no. 7A

– JESD8C (2.7 V to 3.6 V)

– JESD7A (2.0 V to 6.0 V)

• ESD protection:

– HBM JESD22-A114-A exceeds 2000 V

– MM JESD22-A115-A exceeds 200 V

• Specified from -40 °C to +85 °C and from -40 °C to +125 °C

3 Applications

• Process controllers

• Servo-motor control

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