Overview
The CD74HCT688E from Texas Instruments is a high-speed CMOS logic 8-bit magnitude comparator designed for use in a wide range of digital applications. This component is part of the HCT family, which combines the low power consumption of CMOS technology with the high-speed operation of TTL. The CD74HCT688E is particularly suited for applications requiring high-speed data comparison, such as in microprocessors, digital signal processing, and communication systems. Its market positioning targets engineers and designers in the fields of industrial automation, consumer electronics, and automotive electronics who require reliable and efficient digital comparison solutions.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Supply Voltage | 4.5 to 5.5 | V | |
| Operating Temperature | -55 to 125 | °C | |
| Propagation Delay | 19 | ns | Max at 5V |
| Input Current | ±1 | µA | Max at 5.5V |
| Output Current | ±4 | mA | Max at 4.5V |
| Package Type | PDIP | 20-pin |
Key Features
- High-Speed Operation: The CD74HCT688E offers fast propagation delay times, making it ideal for high-speed digital applications.
- Low Power Consumption: As part of the HCT family, it combines the low power consumption of CMOS with the speed of TTL.
- Wide Operating Voltage Range: It operates reliably within a supply voltage range of 4.5V to 5.5V, ensuring compatibility with various digital systems.
- Robust Design: The component is designed to operate over a wide temperature range, from -55°C to 125°C, making it suitable for harsh environments.
Applications
The CD74HCT688E is widely used in various digital systems where high-speed data comparison is required. Typical applications include:
- Microprocessor Systems: Used for comparing data words in microprocessor-based systems.
- Digital Signal Processing: Essential in DSP applications for fast and accurate data comparison.
- Communication Systems: Employed in communication systems for error detection and correction.
- Industrial Automation: Utilized in control systems for monitoring and comparing digital signals.
- Automotive Electronics: Applied in automotive control units for efficient data processing and comparison.
Q & A
1. What is the operating voltage range of the CD74HCT688E?
The CD74HCT688E operates within a supply voltage range of 4.5V to 5.5V.
2. What is the maximum propagation delay of the CD74HCT688E?
The maximum propagation delay is 19 ns at 5V.
3. Can the CD74HCT688E operate in harsh environments?
Yes, it is designed to operate over a wide temperature range from -55°C to 125°C, making it suitable for harsh environments.
4. What is the package type of the CD74HCT688E?
The CD74HCT688E comes in a 20-pin PDIP package.
5. Is the CD74HCT688E compatible with TTL logic levels?
Yes, the CD74HCT688E is compatible with TTL logic levels, combining the low power consumption of CMOS with the speed of TTL.
6. What are the typical applications of the CD74HCT688E?
Typical applications include microprocessor systems, digital signal processing, communication systems, industrial automation, and automotive electronics.
7. What is the maximum input current of the CD74HCT688E?
The maximum input current is ±1 µA at 5.5V.
8. What is the maximum output current of the CD74HCT688E?
The maximum output current is ±4 mA at 4.5V.
9. How does the CD74HCT688E ensure low power consumption?
As part of the HCT family, it combines the low power consumption of CMOS technology with the high-speed operation of TTL.
10. Can the CD74HCT688E be used in automotive control units?
Yes, it is suitable for use in automotive control units for efficient data processing and comparison.
