SN74LV138APW

Product Overview

• Category: Integrated Circuit
• Use: Decoder/Demultiplexer
• Characteristics: Low-voltage, 3-to-8 line decoder/demultiplexer
• Package: TSSOP (Thin Shrink Small Outline Package)
• Essence: Converts a binary input into a corresponding output line
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 1.65V to 5.5V
• High-Level Input Voltage: 2V to VCC + 0.5V
• Low-Level Input Voltage: -0.5V to 0.8V
• High-Level Output Current: -24mA
• Low-Level Output Current: 24mA
• Operating Temperature Range: -40°C to 85°C

Detailed Pin Configuration

The SN74LV138APW has a total of 16 pins:

1. GND (Ground)
2. A0 (Address Input 0)
3. A1 (Address Input 1)
4. A2 (Address Input 2)
5. /G1 (Enable Input)
6. Y0 (Output 0)
7. Y1 (Output 1)
8. Y2 (Output 2)
9. Y3 (Output 3)
10. Y4 (Output 4)
11. Y5 (Output 5)
12. Y6 (Output 6)
13. Y7 (Output 7)
14. VCC (Positive Power Supply)
15. /G2A (Enable Input)
16. /G2B (Enable Input)

Functional Features

The SN74LV138APW is a low-voltage decoder/demultiplexer that takes a 3-bit binary input and activates one of the eight output lines based on the input combination. It operates at a wide supply voltage range and can handle high-level and low-level output currents. The enable inputs (/G1, /G2A, /G2B) control the functioning of the decoder/demultiplexer.

Advantages and Disadvantages

Advantages: - Low-voltage operation - Wide supply voltage range - High output current capability - Compact TSSOP package for space-saving applications

Disadvantages: - Limited to 3-bit input decoding - Not suitable for high-speed applications

Working Principles

The SN74LV138APW works by decoding the binary input (A0, A1, A2) and activating the corresponding output line (Y0-Y7). The enable inputs (/G1, /G2A, /G2B) control the overall functioning of the decoder/demultiplexer. When enabled, the selected output line goes low, while all other output lines remain high.

Detailed Application Field Plans

The SN74LV138APW is commonly used in various digital systems where decoding and demultiplexing functions are required. Some application areas include:

1. Address decoding in microcontrollers and microprocessors
2. Memory selection in RAM and ROM modules
3. Data routing in multiplexed display systems
4. Signal routing in communication systems
5. Control logic in industrial automation

Detailed and Complete Alternative Models

1. SN74LV139A: Dual 2-to-4 line decoder/demultiplexer
2. SN74LV237A: Triple 3-to-8 line decoder/demultiplexer
3. SN74LV541A: Octal buffer/line driver with 3-state outputs
4. SN74LV595A: 8-bit shift register with output storage register

These alternative models offer similar functionality but may have different pin configurations, package types, or additional features.

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