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Product Detailed Parameters
- Description：IC COMPARATOR MAG 4BIT 16SOIC
- Series：74HCT
- Mfr：Texas Instruments
- Package：Bulk,Tube
- Type：Magnitude Comparator
- Number of Bits：4
- Output：Active High
- Output Function：A<B, A=B, A>B
- Voltage - Supply：4.5V ~ 5.5V
- Current - Output High, Low：4mA, 4mA
- Max Propagation Delay @ V, Max CL：40ns @ 4.5V, 50pF
- Current - Quiescent (Iq)：8 µA
- Operating Temperature：-55°C ~ 125°C
- Package / Case：16-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：16-SOIC
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
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Overview
The CD74HCT85M is a high-speed CMOS logic component manufactured by Texas Instruments, functioning as a 4-bit magnitude comparator. It operates within a supply voltage range of 4.5V to 5.5V and features active-high outputs for A<B, A=B, and A>B conditions. The device utilizes a 16-SOIC package with a maximum propagation delay of 40ns at 4.5V and 50pF load. It supports a wide operating temperature range from -55°C to +125°C and maintains a quiescent current of 8µA.
Feature Summary
- Provides four-bit magnitude comparison capabilities with distinct active-high outputs indicating less than, equal to, or greater than relationships between two binary inputs.
Applications
- Digital data processing systems requiring binary value comparison
- Address decoding circuits in microprocessor-based designs
- Control logic for arithmetic units
Procurement Notes
Verify the specific suffix 'M' corresponds to the 16-SOIC package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure input voltage levels align with HCT logic thresholds for reliable operation within the specified temperature range.
Selection Notes
Select this component when a 4-bit comparator is required in a surface-mount design. The HCT series ensures compatibility with standard TTL logic levels while offering CMOS power efficiency. Consider the 16-SOIC footprint for PCB layout constraints and verify thermal requirements for high-temperature environments up to 125°C.
Part Context
This part belongs to the CD74HCT family of high-speed CMOS logic devices. It serves as a functional equivalent to standard 74HCT85 integrated circuits, providing industry-standard pinouts and electrical characteristics for legacy system upgrades or new designs utilizing HCT logic families.
Replacement Considerations
Compatible substitutes include CD74HC85M and CD74HCT85MT. Verify package compatibility and logic level tolerances when substituting HC series parts, as they may differ in noise immunity compared to HCT variants.
