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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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4.4 ★★★★★
Based on 13 reviews
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Product Reviews
★★★★★ 4
Good and sturdy but needs better squaker.
Color: Bunny (Red), Size: One-Size
My Boxer loves these but she kills the squakers in them.
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Reviewed in the United States on April 10, 2026
★★★★★ 5
Best ball for best dogs
Color: Tennis Ball (Green), Size: 1 Count (Pack of 1)
This is my dogs favorite toy I have to buy 4 at a time and keep them on hand. Please do not stop making these it will break his heart. He loves the sound and even after he breaks(hes a very hard chewer no fault to the ball) them hell play with them
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Reviewed in the United States on May 16, 2026
★★★★★ 1
Don’t waste your money on this one!
Color: Tennis Ball (Green), Size: 1 Count (Pack of 1)
Not durable. Grunter squeaker came out of the ball within an hour of supervised fetch.
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Reviewed in the United States on January 20, 2026
★★★★★ 3
Great for the price
Color: Football, Size: One-Size
The reason that I am giving this purchase 3 stars instead of 5, isn't because of the product being faulty. The fault is my own. I didn't think this was a squeaky toy. I thought it was solid. I took it out of its package and gave it to my dog. And when he chomped down on it and it squeaked. He dropped it, barked at it and won't touch it. My dog hates squeaky toys. But it's tough but soft and chewy. The price is nice, the size is perfect for a big dog and the playability is great. Just not for a dog who doesn't like squeaky toys.
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Reviewed in the United States on January 31, 2026
★★★★★ 5
This is Some Bunny!!
Color: Bunny (Red), Size: One-Size, Color: Bunny (Red), Size: One-Size
We have dubbed this THE BUNNY. Our fur baby doesn’t go anywhere without his support Bunny and loves it more than his cat sister. Bowie is a big boy and an aggressive chewer yet Bunny has stood up to him. Bunny can never go away!
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Reviewed in the United States on June 8, 2026