SN74HC257NSR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data Selector/Multiplexer
• Characteristics: High-speed, CMOS technology, 4-to-1 multiplexer
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Efficient data routing and selection
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2V to 6V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 10 ns (typical)
• Maximum Quiescent Current: 8 μA
• Maximum Output Current: ±25 mA

Detailed Pin Configuration

The SN74HC257NSR has a total of 16 pins. The pin configuration is as follows:

1. A0 (Input A0)
2. A1 (Input A1)
3. A2 (Input A2)
4. A3 (Input A3)
5. G (Enable Input)
6. Y (Output Y)
7. B (Input B)
8. C (Input C)
9. D (Input D)
10. GND (Ground)
11. Y (Output Y)
12. C (Input C)
13. D (Input D)
14. B (Input B)
15. VCC (Supply Voltage)
16. A0 (Input A0)

Functional Features

• 4-to-1 Data Selector/Multiplexer
• High-speed operation
• Low power consumption
• Wide supply voltage range
• Compatible with TTL and CMOS logic levels
• Schmitt-trigger inputs for noise immunity
• ESD protection on all inputs and outputs

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient data routing - Low power consumption helps in reducing energy usage - Wide supply voltage range provides flexibility in different applications - Compatibility with TTL and CMOS logic levels ensures versatility - Schmitt-trigger inputs offer improved noise immunity - ESD protection safeguards the IC from electrostatic discharge

Disadvantages: - Limited to 4-to-1 multiplexing, not suitable for larger-scale applications - Propagation delay time may affect real-time data processing in certain scenarios

Working Principles

The SN74HC257NSR is a 4-to-1 multiplexer that selects one of the four input data lines (A, B, C, D) based on the control inputs (A0, A1, A2, A3). The selected data is then routed to the output line (Y). The enable input (G) controls the operation of the multiplexer. When G is low, the multiplexer is disabled, and the output remains in a high-impedance state.

Detailed Application Field Plans

The SN74HC257NSR finds applications in various fields, including:

1. Data routing and selection in digital systems
2. Multiplexing multiple data sources into a single output
3. Address decoding in microcontrollers and memory systems
4. Signal switching in communication systems
5. Input/output expansion in embedded systems

Detailed and Complete Alternative Models

1. CD74HC257E: Similar 4-to-1 multiplexer IC, available in DIP package.
2. SN74HCT257N: 4-to-1 multiplexer with TTL-compatible inputs, available in DIP package.
3. MC74HC257ADR2G: 4-to-1 multiplexer with enhanced ESD protection, available in SOIC package.

These alternative models provide similar functionality to the SN74HC257NSR and can be used as replacements in different applications.

Word count: 439 words