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7485 4-bit Magnitude Comparator – Product Overview
The 7485 is a high-speed, 4-bit magnitude comparator IC that compares two 4-bit binary numbers and indicates whether one is greater than, less than, or equal to the other. It is commonly used in digital systems requiring number comparison, sorting, and decision-making operations.
⚙️ Key Features
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✅ Compares two 4-bit binary words (A and B) simultaneously
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✅ Provides outputs for A > B, A = B, and A < B conditions
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✅ Can be cascaded to compare numbers longer than 4 bits
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✅ High-speed operation with typical propagation delay of ~22 ns
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✅ TTL compatible inputs and outputs
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✅ Operates at standard 5V TTL logic levels
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✅ Available in DIP-16 package for easy breadboard use
📋 Specifications
| Parameter | Description |
|---|---|
| IC Number | 7485 |
| Comparison Bits | 4 bits |
| Outputs | A > B, A = B, A < B |
| Operating Voltage | 4.75V to 5.25V (Typical 5V) |
| Propagation Delay | Approx. 22 ns |
| Logic Family | TTL (Transistor-Transistor Logic) |
| Package Type | DIP-16 |
🎯 Applications
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Digital sorting and priority circuits
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Arithmetic logic units (ALUs)
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Data processing and decision circuits
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Digital communication systems
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Microprocessor and microcontroller interfacing
📦 Package Includes
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1 × 7485 4-bit Magnitude Comparator IC (DIP-16)
Pin Layout
Pin Description
| Pin Number | Description |
|---|---|
| 1 | B3 Input |
| 2 | A |
| 3 | A=B Input |
| 4 | A>B Input |
| 5 | A>B Output |
| 6 | A=B Output |
| 7 | A |
| 8 | Ground |
| 9 | B0 Input |
| 10 | A0 Input |
| 11 | B1 Input |
| 12 | A1 Input |
| 13 | A2 Input |
| 14 | B2 Input |
| 15 | A3 Input |
| 16 | Vcc – Positive Supply |
Dimensional Drawing
Technical Data
Absolute Maximum Ratings
| Supply Voltage | 7V |
| Input Voltage | 5.5V |
| Operating Free Air Temperature | 0°C to +70°C |
| Storage Temperature Range | -65°C to +150°C |
Recommended Operating Conditions
| Symbol | Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Vcc | Supply Voltage | 4.75 | 5 | 5.25 | V |
| Vih | HIGH Level Input Voltage | 2 | V | ||
| Vil | LOW Level Input Voltage | 0.8 | V | ||
| Ioh | HIGH Level Output Current | -0.4 | mA | ||
| Iol | LOW Level Output Current | 16 | mA | ||
| Ta | Free Air Operating Temperature | 0 | 70 | °C |
Electrical Characteristics
| Symbol | Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|---|
| Vi | Input Clamp Voltage | Vcc=Min Ii=-12mA | -1.5 | V | ||
| Voh | HIGH Level Output Voltage | Vcc=Min Ioh=MAX Vil=MAX | 2.4 | 3.4 | V | |
| Vol | LOW Level Output Voltage | Vcc=Min Iol=MAX Vih=MAX | 0.2 | 0.4 | V | |
| Ii | Input Current@MAX Input Voltage | Vcc=Max Vi=5.5V | 1 | mA | ||
| Iih | HIGH Level Input Current | Vcc=Max Vi=2.4V | 40 | µA | ||
| Iil | LOW Level Input Current | Vcc=Max Vi=0.4V | -1.6 | mA | ||
| Ios | Short Circuit Output Current | Vcc=Max | -18 | -55 | mA | |
| Icch | Supply Current with Outputs HIGH | Vcc=Max | 4 | 8 | mA | |
| Iccl | Supply Current with Outputs LOW | Vcc=Max | 12 | 22 | mA |
Switching Characteristics at Vcc=5V,Ta=25°C
| Symbol | Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|---|
| tplh | Propagation Delay Time LOW-to-HIGH Level Output | Cl=15pF Rl=400R | 22 | nS | ||
| tphl | Propagation Delay Time HIGH-to-LOW Level Output | Cl=15pF Rl=400R | 15 | nS |
