SN74ALS157AN

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data Multiplexer
• Characteristics: High-speed, TTL compatible, Quad 2-input multiplexer
• Package: DIP-16 (Dual In-line Package with 16 pins)
• Essence: The SN74ALS157AN is a versatile data multiplexer that allows the selection of one out of four data inputs to be routed to a single output line.
• Packaging/Quantity: Available in tubes or reels, with quantities varying based on customer requirements.

Specifications

• Supply Voltage: 4.5V to 5.5V
• Operating Temperature: -40°C to +85°C
• Propagation Delay: 9ns (typical)
• Input Capacitance: 10pF (typical)
• Output Current: ±24mA
• Logic Family: Advanced Low-Power Schottky (ALS)

Pin Configuration

The SN74ALS157AN has a total of 16 pins, which are assigned specific functions as follows:

1. A Input 1
2. B Input 1
3. C Input 1
4. D Input 1
5. Y Output
6. GND (Ground)
7. D Input 2
8. C Input 2
9. B Input 2
10. A Input 2
11. E Enable Input
12. VCC (Power Supply)
13. D Input 3
14. C Input 3
15. B Input 3
16. A Input 3

Functional Features

• Quad 2-input multiplexer with common select inputs (A, B, C, D) and an enable input (E).
• Allows selection of one out of four data inputs (D1, D2, D3, D4) to be routed to the output (Y).
• TTL compatible inputs and outputs.
• High-speed operation with a typical propagation delay of 9ns.

Advantages and Disadvantages

Advantages

• Versatile data multiplexer suitable for various applications.
• High-speed operation allows for efficient data routing.
• TTL compatibility ensures easy integration with existing systems.
• Compact DIP-16 package facilitates easy installation and replacement.

Disadvantages

• Limited to selecting one out of four data inputs, may not be suitable for applications requiring more complex multiplexing.

Working Principles

The SN74ALS157AN operates based on the principle of digital multiplexing. It uses the select inputs (A, B, C, D) to determine which of the four data inputs (D1, D2, D3, D4) is connected to the output (Y). The enable input (E) controls the overall functionality of the multiplexer. When E is high, the multiplexer is enabled, and the selected data input is passed through to the output. When E is low, the multiplexer is disabled, and the output remains in a high-impedance state.

Detailed Application Field Plans

The SN74ALS157AN can be used in various applications that require data multiplexing, such as:

1. Data routing in communication systems.
2. Address decoding in memory systems.
3. Input selection in microcontroller-based systems.
4. Signal switching in test and measurement equipment.

Detailed and Complete Alternative Models

• SN74ALS158N: Quad 2-input multiplexer with inverted outputs.
• SN74ALS153N: Dual 4-input multiplexer.
• SN74ALS151N: 8-input multiplexer with common select inputs.

These alternative models provide similar functionality to the SN74ALS157AN and can be considered based on specific application requirements.

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