SN74F138DR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: High-speed, low-power consumption
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Decodes binary information into multiple output lines
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 2V to 6V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 11 ns (typical)
• Output Current: ±24 mA

Detailed Pin Configuration

The SN74F138DR has a total of 16 pins. The pin configuration is as follows:

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 (Supply Voltage)
15. /G2A (Enable Input)
16. /G2B (Enable Input)

Functional Features

The SN74F138DR is a 3-to-8 line decoder/demultiplexer IC. It takes three address inputs (A0, A1, A2) and one enable input (/G1) to decode the binary information and generate eight output lines (Y0-Y7). The enable inputs (/G2A, /G2B) further control the operation of the decoder/demultiplexer. It operates at high speed and consumes low power, making it suitable for various digital applications.

Advantages and Disadvantages

Advantages: - High-speed operation - Low power consumption - Compact SOIC package - Wide operating voltage range - Multiple output lines for versatile applications

Disadvantages: - Limited number of address inputs (3 bits) - Output current limited to ±24 mA

Working Principles

The SN74F138DR works based on the principle of binary decoding. The three address inputs (A0, A1, A2) represent a binary code, which is decoded internally to activate one of the eight output lines (Y0-Y7). The enable inputs (/G1, /G2A, /G2B) control the overall operation of the decoder/demultiplexer. When the enable inputs are active, the selected output line becomes active, while all other output lines remain inactive.

Detailed Application Field Plans

The SN74F138DR can be used in various applications, including but not limited to: - Address decoding in microprocessors and microcontrollers - Memory selection in digital systems - Data routing in communication systems - Signal demultiplexing in multimedia devices - Control logic implementation in industrial automation

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the SN74F138DR include: - 74HC138: High-speed CMOS version - CD74HCT138: High-speed TTL version - DM74LS138: Low-power Schottky version - MC14538: Dual 1-of-4 decoder/demultiplexer

These alternative models provide different characteristics and may be suitable for specific application requirements.

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