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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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Product Reviews
★★★★★ 3
Good looks but cheap fabric
Size: Large, Color: Light Blue
The sizing is about right, but the fabric is really cheap, flimsy and rough. Disappointed and this is going back
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Reviewed in the United States on March 29, 2026
★★★★★ 5
Nice!
Size: Medium, Color: Bright Blue
My husband loves these. He’s got black, navy, bright blue, burgundy, grey…. and I’m sure I may be missing some! They hold up nicely after repeated washings in cold water in the machine and I always hang to dry. For golf they are fabulous because they are non constricting and comfortable while playing in the hot Florida sun which he does on a daily basis. They run very true to size….he takes his usual medium and they fit perfectly. Highly recommend!
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Reviewed in the United States on February 21, 2026
★★★★★ 5
nice fit
I am thoroughly impressed with this Amazon Essentials white shirt. For the price, the quality is outstanding. The fabric feels soft, breathable, and has a good weight to it
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Reviewed in the United States on June 12, 2026
★★★★★ 5
Nice shirt, great price.
Fit Type: Regular Fit, Color: White, Size: Medium
Worn it twice and I find it very comfortable. I wear it outside and casually to protect my arms and neck from the sun and find it more comfortable than a long sleeve t-shirt. The price is comparable. If I was to wear it to the office it would have to be ironed. I bought one shirt to try it and I will be buying more.
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Reviewed in the United States on May 8, 2026
★★★★★ 4
Nice shirt!
Fit Type: Regular Fit, Color: White, Size: X-Large
I added one of these shirts to another order just to see if they were any good. I was pleasantly surprised by the quality. It fits perfectly and looks pretty nice for a low cost casual dress shirt. Materials seem decent quality. Comfortable, soft fabric. Didn’t shrink too much in the washer and dryer. We’ll see how it holds up long term but so far so good
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Reviewed in the United States on November 12, 2025