SN74LS253DR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Multiplexer/Demultiplexer
• Characteristics: Dual 4-Line to 1-Line Data Selectors/Multiplexers
• Package: SOIC-16
• Essence: Combines two 4-line to 1-line multiplexers in a single chip
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 4.75V to 5.25V
• High-Level Input Voltage: 2V to VCC
• Low-Level Input Voltage: GND to 0.8V
• High-Level Output Voltage: 2.7V (min)
• Low-Level Output Voltage: 0.5V (max)
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 9ns (typical)

Detailed Pin Configuration

The SN74LS253DR has a total of 16 pins, which are assigned as follows:

1. A0 - Data Select Input for MUX 1
2. B0 - Data Select Input for MUX 2
3. A1 - Data Select Input for MUX 1
4. B1 - Data Select Input for MUX 2
5. Y - Multiplexer Output
6. GND - Ground
7. C - Carry Input
8. S - Strobe Input
9. D - Data Input
10. VCC - Positive Power Supply
11. D - Data Input
12. S - Strobe Input
13. C - Carry Input
14. Y - Multiplexer Output
15. B1 - Data Select Input for MUX 2
16. A1 - Data Select Input for MUX 1

Functional Features

• Dual 4-line to 1-line data selectors/multiplexers
• Allows selection between two sets of four input signals
• Provides a single output based on the selected input
• Strobe input enables or disables the multiplexer operation
• Carry input allows cascading multiple SN74LS253DR devices

Advantages and Disadvantages

Advantages: - Compact design with dual functionality - Low power consumption - Wide operating temperature range - Easy to integrate into existing circuitry

Disadvantages: - Limited number of input/output lines - Propagation delay may affect high-speed applications - Requires external components for proper operation

Working Principles

The SN74LS253DR is designed to perform the function of a dual 4-line to 1-line multiplexer. It selects one of the two sets of four input signals based on the data select inputs (A0, A1, B0, B1). The selected input is then routed to the output pin (Y) while the other inputs are ignored.

The strobe input (S) controls the operation of the multiplexer. When the strobe input is high, the multiplexer is enabled, and the selected input is passed to the output. Conversely, when the strobe input is low, the multiplexer is disabled, and the output remains in a high-impedance state.

The carry input (C) allows cascading multiple SN74LS253DR devices to increase the number of input lines. By connecting the carry output of one device to the carry input of another, a larger multiplexer can be created.

Detailed Application Field Plans

The SN74LS253DR is commonly used in various applications, including:

1. Data routing and selection in digital systems
2. Address decoding in memory systems
3. Input signal selection in communication systems
4. Control signal routing in industrial automation
5. Multiplexing of analog signals in audio/video equipment

Detailed and Complete Alternative Models

1. SN74LS151 - 8-Line to 1-Line Data Selector/Multiplexer
2. SN74LS157 - Quad 2-Line to 1-Line Data Selector/Multiplexer
3. SN74LS257 - Quad 2-Line to 1-Line Data Selector/Multiplexer with 3-State Outputs
4. SN74LS352 - Dual 4-Line to 1-Line Data Selector/Multiplexer with Inverted Output

These alternative models offer similar functionality to the SN74LS253DR and can be used as replacements or alternatives depending on specific requirements.

In conclusion, the SN74LS253DR is a versatile integrated circuit that combines two 4-line to 1-line multiplexers in a single chip. It offers a compact design, low power consumption, and wide operating temperature range. With its various applications and alternative models, it provides flexibility for different circuit designs.