Overview
The SN74HC688N is an 8-bit identity comparator produced by Texas Instruments. This component 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 SN74HC688N is part of the HC688 series, known for its wide operating voltage range and low power consumption, making it suitable for various digital logic applications.
Key Specifications
| Parameter | Unit | Min | Nom | Max |
|---|---|---|---|---|
| Supply Voltage (VCC) | V | 2 | 5 | 6 |
| High-Level Input Voltage (VIH) | V | 1.5 (VCC=2V), 3.15 (VCC=4.5V), 4.2 (VCC=6V) | ||
| Low-Level Input Voltage (VIL) | V | 0.5 (VCC=2V), 1.35 (VCC=4.5V), 1.8 (VCC=6V) | ||
| Input Transition Time | ns | 1000 (VCC=2V), 500 (VCC=4.5V), 400 (VCC=6V) | ||
| Operating Free-Air Temperature | °C | -40 | 85 | |
| Output Drive Current | mA | -4 (VCC=4.5V), -5.2 (VCC=6V) | ||
| Propagation Delay Time (tpd) | ns | 113 (VCC=2V), 30 (VCC=4.5V), 24 (VCC=6V) | ||
| Power Dissipation Capacitance | pF | 40 |
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 time (tpd) 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
Applications
The SN74HC688N is suitable for various digital logic applications, including data processing, digital control systems, and any scenario where the comparison of two 8-bit words is necessary. It is particularly useful in environments requiring low power consumption and high reliability.
Q & A
- What is the primary function of the SN74HC688N?
The primary function of the SN74HC688N 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 SN74HC688N?
The operating voltage range is from 2 V to 6 V. - What is the maximum propagation delay time for the SN74HC688N at 5 V?
The maximum propagation delay time at 5 V is approximately 63 ns. - How much current can the outputs drive?
The outputs can drive up to 10 LSTTL loads. - What is the typical power consumption of the SN74HC688N?
The typical power consumption is 80 μA. - What is the input transition time at 5 V?
The input transition time at 5 V is 500 ns. - What is the operating temperature range for the SN74HC688N?
The operating temperature range is from -40°C to 85°C. - Can the SN74HC688N be used in safety-critical applications?
No, it is not recommended for use in safety-critical applications without proper evaluation and testing. - What packages are available for the SN74HC688N?
The SN74HC688N is available in PDIP (N), SOIC (DW), TSSOP (PW), and other packages. - How does the output-enable (OE) input function?
The output-enable (OE) input can force the output to a high level.
