74ls688 8-bit Magnitude Comparators
The 74LS688 IC is a high-speed 8-bit magnitude comparator from the 74LS TTL logic family. It is primarily designed to compare two 8-bit binary words (A and B inputs). The output indicates whether the two inputs are equal.
It is widely used in address comparison, digital memory systems, CPU interfacing, and embedded logic circuits. The 74LS688 simplifies complex logic design by providing direct equality detection with minimal external circuitry.
🔹 Applications
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Address decoding in memory systems
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Equality checking in CPU and microcontroller systems
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Digital comparators in embedded electronics
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Data validation and matching circuits
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Robotics and automation control systems
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Educational projects and digital system design
🔹 Precautions
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Supply voltage must be regulated at +5V DC
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Do not exceed input voltage levels beyond Vcc or GND
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Protect inputs from electrostatic discharge (ESD)
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Avoid excessive fan-out loads on output pins
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Use proper grounding to reduce noise in high-speed circuits
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Solder carefully to avoid damaging the IC pins
🔹 Technical Specifications
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IC Type: 8-bit Magnitude Comparator
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Package: DIP-20
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Inputs: Two 8-bit binary words (A0–A7, B0–B7)
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Output: Equality output (low when A = B)
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Logic Family: TTL (74LS series)
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Supply Voltage (Vcc): 4.75V – 5.25V
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Propagation Delay: ~20 ns typical
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Fan-out: 10 LS-TTL loads
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Input Current: Low input leakage
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Pin Count: 20 pins
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Operating Temperature: 0°C to +70°C
📹 Tutorial Video
Watch 74LS688 Comparator Tutorial
🔹 Related Categories
🔹 Summary
The 74LS688 8-bit Magnitude Comparator IC (DIP-20) is a fast and reliable logic device for address decoding, data comparison, and equality detection in digital systems. With its TTL compatibility, low power consumption, and high-speed operation, it is widely used in embedded systems, robotics, and automation projects. A must-have component in your IC’s collection.
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