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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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4.1 ★★★★★
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Product Reviews
★★★★★ 5
Perfect for heatpresses
Number of Items: 6
Game changer when making sublimation mugs or pressing shirts. Will always keep this in hand
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Reviewed in the United States on May 30, 2026
★★★★★ 4
Tape small
Number of Items: 6
The tape rollers are much smaller than expected 2 in circles with little tape. WTf moment
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Reviewed in the United States on May 2, 2026
★★★★★ 5
Must have
Number of Items: 2
This heat tape works beautifully, really holds the shirt in place.. It's a definite must have for your heat press
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Reviewed in the United States on April 12, 2026
★★★★★ 5
Sublimation tape that works.
Number of Items: 2
Very strong and sticky tape. Great to use for sublimation on tumblers. No residual left on tumblers. Holds amazing. Stretch is just enough to help you get things nice and tight.
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Reviewed in the United States on February 15, 2026
★★★★★ 5
Durable, Odorless, and Reliable — A Must‑Have 3‑Pack
Size: 3Pack 16"x20" Black
I’m really impressed with this 3 Pack PTFE Teflon Sheet for Heat Press (16 x 20"). The quality is excellent, and the non‑stick surface makes every press come out clean and smooth. One thing I really appreciate is that there’s absolutely no smell, even when using high heat. It makes the whole process more comfortable and professional.
These sheets offer great protection for both the heat press and the materials. They prevent scorching, keep the plates clean, and stop any vinyl or ink from sticking. My projects come out more consistent because the sheets help distribute heat evenly and act as a reliable barrier.
The 3‑pack is a huge bonus. I keep one on my press, one as a backup, and one for different materials like HTV or sublimation. It saves time and keeps everything cleaner when I’m working on multiple items.
The 16 x 20 size is perfect for shirts, tote bags, and larger designs, and the sheets stay flat without curling. If you want something that protects your equipment, has no smell, and delivers clean results every time, this set is definitely worth it.
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Reviewed in the United States on December 18, 2025