Overview
The SN74HC688DWR, 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. The SN74HC688DWR is part of the 74HC series, known for its high performance and low power consumption, making it suitable for a variety of digital logic applications.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | 5 | 6 | V |
| High-Level Input Voltage (VIH) | 1.5 (VCC=2V), 3.15 (VCC=4.5V), 4.2 (VCC=6V) | V | ||
| Low-Level Input Voltage (VIL) | 0.5 (VCC=2V), 1.35 (VCC=4.5V), 1.8 (VCC=6V) | V | ||
| Output Voltage (VO) | 0 | VCC | V | |
| Input Transition Time (tt) | 400ns (VCC=2V), 500ns (VCC=4.5V), 400ns (VCC=6V) | ns | ||
| Propagation Delay (tpd) | 24ns (VCC=6V, CL=50pF) | 36ns (VCC=6V, CL=50pF) | ns | |
| Quiescent Current (ICC) | 8 | 80 | μA | |
| Operating Temperature Range | -40 | 85 | °C | |
| Package Type | 20-SOIC (0.295", 7.50mm Width) |
Key Features
- Wide operating voltage range of 2 V to 6 V
- High-current outputs drive up to 10 LSTTL loads
- Low power consumption, 80-μA max ICC
- Typical propagation delay of 14 ns
- ±4-mA output drive at 5 V
- Low input current of 1 μA max
- Compare two 8-bit binary or BCD words
- Output-enable (OE) input to force output to high level
Applications
The SN74HC688DWR is versatile and can be used in various digital logic applications, including:
- Digital comparators in microprocessor systems
- Data validation and error detection circuits
- Binary or BCD code comparison in digital systems
- Automated control systems requiring precise data comparison
- Embedded systems where low power consumption is critical
Q & A
- What is the primary function of the SN74HC688DWR?
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 SN74HC688DWR?
The operating voltage range is from 2 V to 6 V.
- How much current can the outputs drive?
The outputs can drive up to 10 LSTTL loads.
- What is the typical propagation delay of the SN74HC688DWR?
The typical propagation delay is 14 ns.
- What is the maximum quiescent current consumption?
The maximum quiescent current consumption 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.
- What are the package options available for the SN74HC688DWR?
Available packages include SOIC (20), PDIP (20), TSSOP (20), CDIP (20), and LCCC (20).
- What is the operating temperature range of the SN74HC688DWR?
The operating temperature range is from -40°C to 85°C.
- Can the SN74HC688DWR be used in safety-critical applications?
No, it is not recommended for use in safety-critical applications without proper evaluation and testing.
- Where can I find detailed specifications and documentation for the SN74HC688DWR?
Detailed specifications and documentation can be found on the Texas Instruments website and in the datasheet provided.
