7485 IC 4-Bit Magnitude Comparator DIP-16
The IC 7485 is a 4-bit magnitude comparator that evaluates the relationship between two 4-bit binary numbers, labeled A (A0–A3) and B (B0–B3). It compares the two inputs and outputs three signals: A > B, A = B, and A < B, each indicating the result of the comparison.
The device also features cascading inputs and outputs, allowing designers to connect multiple 7485s together to compare numbers larger than 4 bits. You can chain them to create 8-bit, 12-bit, or even 16-bit comparators by feeding the cascading outputs of one IC into the cascading inputs of the next.
This IC supports high-speed logic-level comparisons and integrates seamlessly with other TTL components. It eliminates the need for extra logic gates when comparing binary values in digital circuits.
Key Features
Compares two 4-bit binary values
Outputs signals for A > B, A = B, and A < B
Includes cascading inputs and outputs for multi-bit comparison
Fast response time with TTL-level compatibility
Works reliably with 5V logic systems
Packaged in standard 16-pin DIP or SOIC formats
Simple interface with microprocessors and control units
Applications
Compare binary values in digital control systems
Build 8-bit or higher comparators using cascading
Determine priority in binary-coded decision logic
Implement sorting logic in embedded systems
Use in memory address comparators
Create digital selectors based on value comparison
Detect matching or mismatching digital signals
Perform conditional branching in hardware logic
Compare counter outputs in automation circuits
Teach binary comparison in digital electronics labs
Specifications Table
| Parameter | Value |
|---|---|
| Logic Family | TTL |
| Comparison Type | 4-bit Binary Magnitude |
| Input A | A0–A3 |
| Input B | B0–B3 |
| Outputs | A > B, A = B, A < B |
| Cascading Capability | Yes (via cascading inputs/outputs) |
| Input HIGH Voltage | ≥ 2.0V |
| Input LOW Voltage | ≤ 0.8V |
| Output HIGH Voltage | ≥ 2.4V |
| Output LOW Voltage | ≤ 0.4V |
| Supply Voltage (Vcc) | 4.75V to 5.25V |
| Typical Operating Voltage | 5V ‘ |
| Propagation Delay | ~18–30 ns |
| Power Consumption | ~22 mW |
| Operating Temperature | 0°C to 70°C |
| Package Type | DIP-16 / SOIC-16 |
| Number of Pins | 16 |
