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74HC85 4 bit Magnitude Comparator IC (7485) DIP 16 Package
The 74HC85 is a high-speed CMOS 4-bit magnitude comparator designed to compare two 4-bit binary or BCD numbers (A and B).
It determines whether A > B, A = B, or A < B and provides corresponding logic outputs.
This IC can also be cascaded with additional 74HC85 units to compare numbers larger than 4 bits (e.g., 8-bit or 16-bit comparisons).
It’s widely used in digital systems, arithmetic logic units (ALUs), and microprocessor-based circuits where fast numerical comparison is required.
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Features:-
- • Serial or parallel expansion without extra gating
- • Magnitude comparison of any binary words
- • Output capability: standard
- • ICC category: MSI
Specifications:-
| Symbol | Parameter | Conditions | Typical | Unit | |
| HC | HCT | ||||
| tPHL/ tPLH | Propagation Delay to QAB 15 15 ns IA=B to QA=B 11 15 ns | CL = 15 pF; VCC = 5 V | ns | ||
| An, Bn to QA>B , QAB | 20 | 22 | ns | ||
| An, Bn to QA=B | 18 | 20 | ns | ||
| IA<B,, IA=B, IA>B to QA<B, QA>B | 15 | 15 | ns | ||
| A=B to QA=B | 11 | 15 | ns | ||
| CI | Input Capacitance | 3.5 | 3.5 | Pf | |
| CPD | Power Dissipation Capacitance per package | notes 1 and 2 | 18 | 20 | Pf |
Applications
- Digital comparators in ALUs and CPUs
- Sorting and decision-making circuits
- Address decoding and priority encoders
- Binary and BCD magnitude comparison
- Data validation or verification systems
- Comparator-based control logic
- Microcontroller or FPGA logic interfacing
* Product image for illustration purposes only, actual product may vary.
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