SN74S138ANSR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: High-speed, TTL compatible, 3-to-8 line decoding
• Package: SOP (Small Outline Package)
• Essence: Decodes a binary input into one of eight outputs
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 4.5V to 5.5V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 15ns (typical)
• Output Current: ±6mA
• Power Dissipation: 500mW (max)

Detailed Pin Configuration

The SN74S138ANSR has a total of 16 pins, which are assigned as follows:

1. GND (Ground)
2. A0 (Input A0)
3. A1 (Input A1)
4. A2 (Input A2)
5. E1 (Enable Input 1)
6. Y0 (Output Y0)
7. Y1 (Output Y1)
8. Y2 (Output Y2)
9. Y3 (Output Y3)
10. Y4 (Output Y4)
11. Y5 (Output Y5)
12. Y6 (Output Y6)
13. Y7 (Output Y7)
14. E2 (Enable Input 2)
15. VCC (Positive Power Supply)
16. GND (Ground)

Functional Features

The SN74S138ANSR is a decoder/demultiplexer IC that takes a three-bit binary input and decodes it into one of eight possible outputs. It operates at high speed and is TTL compatible, making it suitable for a wide range of applications. The IC has two enable inputs (E1 and E2) that control the operation of the decoder. When both enable inputs are high, the decoder is enabled, and the selected output is determined by the binary input.

Advantages and Disadvantages

Advantages: - High-speed decoding - TTL compatibility - Wide operating temperature range - Low power dissipation

Disadvantages: - Limited to 3-to-8 line decoding - Requires external enable inputs

Working Principles

The SN74S138ANSR works on the principle of combinational logic. The three-bit binary input is decoded using internal circuitry, which activates one of the eight output lines based on the input combination. The enable inputs control the operation of the decoder, allowing the user to enable or disable the outputs as needed.

Detailed Application Field Plans

The SN74S138ANSR can be used in various applications, including but not limited to:

1. Address decoding in microprocessors and memory systems
2. Data routing in multiplexers and demultiplexers
3. Control signal generation in digital systems
4. Code conversion in binary-to-decimal converters
5. Logic circuit design and implementation

Detailed and Complete Alternative Models

1. SN74LS138N: Similar functionality, but operates at a lower speed.
2. CD74HC138E: High-speed CMOS alternative with similar pin configuration.
3. MC14538B: Dual 1-of-4 decoder/demultiplexer with additional features.

These alternative models offer similar decoding capabilities and can be used as substitutes for the SN74S138ANSR depending on specific requirements.

In conclusion, the SN74S138ANSR is a versatile decoder/demultiplexer IC that provides high-speed decoding of a three-bit binary input into one of eight possible outputs. Its TTL compatibility, wide operating temperature range, and low power dissipation make it suitable for various applications in digital systems.