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Description
74HC688Comparator ID 8 BIT 20PD(18) Feature Basic Information: Type: Parallel Priority Encoder Family: 74HC (High Speed CMOS) Function: Converts 8 input lines into a 3 bit binary output, providing priority to the highest order active input. Pin Configuration: Inputs: A0 to A7 (8 inputs) Outputs: Y0, Y1, Y2 (3 bit binary output) Control Inputs: G (Enable): Activates the device. A (Active Low): When low, it allows the encoder to function. Operation: The
Comparator ID 8-BIT 20PD(18)
Feature
Basic Information:
- Type: Parallel Priority Encoder
- Family: 74HC (High-Speed CMOS)
- Function: Converts 8 input lines into a 3-bit binary output, providing priority to the highest-order active input.
Pin Configuration:
- Inputs: A0 to A7 (8 inputs)
- Outputs: Y0, Y1, Y2 (3-bit binary output)
Control Inputs:
- G (Enable): Activates the device.
- A (Active Low): When low, it allows the encoder to function.
Operation:
- The 74HC688 encodes the highest priority active input (from A0 to A7) into a binary output.
- If no inputs are active, the outputs are set to a predefined state (usually all low).
Electrical Characteristics:
- Supply Voltage (Vcc): Typically operates at 2V to 6V.
- High Level Input Voltage (VIH): Minimum value required for a high logic level.
- Low Level Input Voltage (VIL): Maximum value for a low logic level.
- Output High Voltage (VOH): Minimum value for a high output.
- Output Low Voltage (VOL): Maximum value for a low output.
Additional Information
| Device | Comparator |
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4.6 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 5
Great Buy
Works perfect and didn't short out in 2 days like some others. Charges fast too.
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Reviewed in the United States on May 25, 2026
★★★★★ 5
Great laptop replacement charger
Works for my chromebook was a perfect replacement for my old charger does get a little warm
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Reviewed in the United States on May 18, 2026
★★★★★ 4
Fairly reliable
Doesn't always negotiate correctly and sometimes cuts out.
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Reviewed in the United States on March 2, 2026
★★★★★ 5
Good buy
Compatible with my Lenovo thinkpad. Good cable quality. Doesn't get hot while charging. Charges at a good speed.
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Reviewed in the United States on June 3, 2026
★★★★★ 5
Laptop Charger
Was exactly what i needed for my laptop i have had it for a few months and its perfect works great no issues with overheating i use it to charge a bunch of other things also very versatile and super durable love the length
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Reviewed in the United States on May 7, 2026