74ls688 8-bit Magnitude Comparators
The 74LS688 is a powerful 8-bit magnitude comparator that determines whether two 8-bit binary inputs (A0–A7 and B0–B7) are exactly equal. Built using Low Power Schottky TTL technology, it offers fast, reliable, and consistent logic-level comparisons with minimal power consumption. It’s widely used in memory address decoding, bus comparators, and other digital control logic circuits where real-time data comparison is crucial.
With a single active-low output (P=Q), the IC simplifies equality checking in address decoding and enables precise control flow in programmable logic systems.
🛠 Technical Details
| Specification | Details |
|---|---|
| IC Type | 8-bit Magnitude Comparator |
| Logic Family | TTL (Low Power Schottky) |
| Supply Voltage (Vcc) | 4.75V – 5.25V |
| Inputs | A0–A7, B0–B7, Enable Inputs |
| Output | P = Q (active-low) |
| Propagation Delay | ~25ns |
| Package Type | DIP-20 / SOIC-20 |
| Operating Temperature | 0°C to 70°C |
| Mount Type | Through-hole or SMD |
💡 Use Cases & Applications
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Address Matching in Microprocessors
Quickly compares CPU addresses for memory selection or data routing. -
Memory Decoding Logic
Determines when an address matches a predefined range or device ID. -
Digital Multiplexing Control
Helps select output channels based on exact binary conditions. -
Programmable Logic Controllers (PLCs)
Used in industrial automation for conditional logic operations. -
Digital Logic Learning Kits
A valuable part of logic trainer kits and educational platforms. -
Embedded Systems Comparators
Provides condition control between peripheral inputs and microcontroller outputs.
🛠️ Pair With
🎥 YouTube Tutorial
📺 Explore how equality comparator circuits work with 74LS688:
👉 Watch Video Tutorial
⚠️ Precautions & Tips
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🔋 Ensure all inputs are properly pulled up/down to avoid floating logic states.
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⚠️ Match TTL voltage levels for compatibility with other ICs.
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🧪 Test input conditions under real-time logic conditions before final circuit implementation.
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📘 Review datasheet before combining with memory or bus systems.
🏁 Summary & Call-to-Action
The 74LS688 8-bit Comparator delivers fast, precise logic-level matching for address decoding and digital logic control. Whether you’re working on a memory interface or an embedded automation solution, this IC is a cornerstone for equality-based logic decisions.
🛒 Get it now at Electroway and streamline your next digital logic design.
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