Overview
The SN74HC257N is a quadruple 2-line to 1-line data selector/multiplexer integrated circuit produced by Texas Instruments. This device is designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. It features 3-state outputs, which do not load the data lines when the output-enable (G) input is at a high logic level. This component is widely used in high-performance systems to provide bus interface from multiple sources.
Key Specifications
| Specification | Value |
|---|---|
| Package | 16-DIP (0.300", 7.62mm) |
| Pins | 16 |
| Operating Temperature Range | -40°C to 85°C |
| Voltage Supply Source | Single Supply |
| Voltage - Supply | 2 V to 6 V |
| Mounting Type | Through Hole |
| Current - Output High, Low | 7.8mA, 7.8mA |
| Low Input Current | 1 µA Max |
| Propagation Delay (Typical) | 9 ns |
Key Features
- Wide Operating Voltage Range of 2 V to 6 V
- High-Current Inverting Outputs Drive up to 15 LSTTL Loads
- Low Power Consumption, 80-µA Max ICC
- ±6-mA Output Drive at 5 V
- Low Input Current of 1 µA Max
- Provides Bus Interface from Multiple Sources in High-Performance Systems
Applications
The SN74HC257N is suitable for various applications in high-performance systems, including:
- Bus-organized systems where multiple data sources need to be multiplexed onto a single data line.
- High-speed data processing and transmission systems.
- Embedded systems requiring low power consumption and high reliability.
- Digital logic circuits where signal multiplexing is necessary.
Q & A
- What is the primary function of the SN74HC257N?
The primary function is to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. - What is the operating voltage range of the SN74HC257N?
The operating voltage range is from 2 V to 6 V. - What is the typical propagation delay of the SN74HC257N?
The typical propagation delay is 9 ns. - How many output lines does the SN74HC257N have?
The device has 4 output data lines. - What is the maximum output current of the SN74HC257N?
The maximum output current is 7.8 mA for both high and low states. - Is the SN74HC257N RoHS compliant?
Yes, the SN74HC257N is RoHS compliant. - What is the package type of the SN74HC257N?
The package type is 16-DIP (0.300", 7.62mm). - What is the operating temperature range of the SN74HC257N?
The operating temperature range is from -40°C to 85°C. - How many channels does the SN74HC257N have?
The device has 4 channels, each configured as a 2:1 multiplexer. - What is the purpose of the output-enable (G) input?
The output-enable (G) input controls the 3-state outputs, ensuring they are in a high-impedance state when the input is high.
