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74HCT85DB

4-bit magnitude comparator

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.

This product has been discontinued, click here for discontinuation information and replacement parts.

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 standards:

    • 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

Applications

  • Process controllers

  • Servo-motor control

Parametrics

Type number Product status Package name
74HCT85DB End of life SSOP16

PCB Symbol, Footprint and 3D Model

Model Name Description

Package

All type numbers in the table below are discontinued. See the table Discontinuation information for more information.

Type number Orderable part number, (Ordering code (12NC)) Status Marking Package Package information Reflow-/Wave soldering Packing
74HCT85DB 74HCT85DB,112
(935190310112)
Obsolete no package information
74HCT85DB,118
(935190310118)
Obsolete

Environmental information

All type numbers in the table below are discontinued. See the table Discontinuation information for more information.

Type number Orderable part number Chemical content RoHS RHF-indicator
74HCT85DB 74HCT85DB,112 74HCT85DB rohs rhf rhf
74HCT85DB 74HCT85DB,118 74HCT85DB rohs rhf rhf
Quality and reliability disclaimer

Documentation (3)

File name Title Type Date
74HC_HCT85 4-bit magnitude comparator Data sheet 2021-08-04
AN11044 Pin FMEA 74HC/74HCT family Application note 2019-01-09
HCT_USER_GUIDE HC/T User Guide User manual 1997-10-31

Support

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Models

No documents available

PCB Symbol, Footprint and 3D Model

Model Name Description

How does it work?

The interactive datasheets are based on the Nexperia MOSFET precision electrothermal models. With our interactive datasheets you can simply specify your own conditions interactively. Start by changing the values of the conditions. You can do this by using the sliders in the condition fields. By dragging the sliders you will see how the MOSFET will perform at the new conditions set.