Overview
The SN74HC688PWRE4, produced by Texas Instruments, is an 8-bit identity comparator integrated circuit. This device is designed to compare two 8-bit binary or BCD words and provide an output based on the comparison. It features an output-enable (OE) input that can force the output to a high level when necessary. The SN74HC688 is part of the HC688 family, known for its wide operating voltage range and low power consumption, making it suitable for a variety of digital logic applications.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC (Supply Voltage) | V | 2 | 5 | 6 |
| VIH (High-Level Input Voltage) | V | 1.5 (VCC=2V), 3.15 (VCC=4.5V), 4.2 (VCC=6V) | ||
| VIL (Low-Level Input Voltage) | V | 0.5 (VCC=2V), 1.35 (VCC=4.5V), 1.8 (VCC=6V) | ||
| ICC (Quiescent Current) | μA | 8 | 80 | 160 |
| tpd (Propagation Delay) | ns | 24 (VCC=6V), 30 (VCC=4.5V), 113 (VCC=2V) | 36 (VCC=6V), 42 (VCC=4.5V), 210 (VCC=2V) | 53 (VCC=6V), 63 (VCC=4.5V), 313 (VCC=2V) |
| IOH (High-Level Output Current) | mA | -20 | -4 (VCC=4.5V), -5.2 (VCC=6V) | |
| IOL (Low-Level Output Current) | mA | 20 | 4 (VCC=4.5V), 5.2 (VCC=6V) | |
| TJ (Junction Temperature) | ℃ | 150 | ||
| Tstg (Storage Temperature Range) | ℃ | -65 | 150 | |
| TA (Operating Free-Air Temperature) | ℃ | -40 | 85 |
Key Features
- Wide operating voltage range of 2 V to 6 V
- High-current outputs drive up to 10 LSTTL loads
- Low power consumption, with a maximum ICC of 80 μA
- Typical propagation delay of 14 ns at VCC = 6 V
- ±4-mA output drive at 5 V
- Low input current of 1 μA max
- Ability to compare two 8-bit binary or BCD words
- Output-enable (OE) input to force the output to a high level
Applications
The SN74HC688PWRE4 is suitable for various digital logic applications, including:
- Digital comparators in microprocessor systems
- Data validation and error detection circuits
- Binary and BCD code comparison in digital systems
- Automated control systems requiring precise data comparison
- Embedded systems where low power consumption is crucial
Q & A
- What is the primary function of the SN74HC688PWRE4?
The primary function is to compare two 8-bit binary or BCD words and provide an output based on the comparison.
- What is the operating voltage range of the SN74HC688PWRE4?
The operating voltage range is from 2 V to 6 V.
- What is the maximum propagation delay at VCC = 6 V?
The maximum propagation delay at VCC = 6 V is 53 ns.
- How much current can the outputs drive?
The outputs can drive up to 10 LSTTL loads.
- What is the maximum quiescent current (ICC) of the device?
The maximum quiescent current (ICC) is 80 μA.
- What is the purpose of the output-enable (OE) input?
The output-enable (OE) input can force the output to a high level when necessary.
- What are the typical applications of the SN74HC688PWRE4?
Typical applications include digital comparators in microprocessor systems, data validation and error detection circuits, and binary and BCD code comparison in digital systems.
- What is the storage temperature range for the SN74HC688PWRE4?
The storage temperature range is from -65℃ to 150℃.
- What is the operating free-air temperature range for the SN74HC688PWRE4?
The operating free-air temperature range is from -40℃ to 85℃.
- What package types are available for the SN74HC688?
The device is available in SOIC, PDIP, TSSOP, CDIP, and LCCC packages.
