SN74AHC138PWG4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: High-speed, low-power, 3-to-8 line decoder/demultiplexer
• Package: TSSOP-16
• Essence: Converts a binary input into a corresponding output based on the selected line
• Packaging/Quantity: Tape and reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2 V to 5.5 V
• Input Voltage Range: 0 V to VCC
• Output Voltage Range: 0 V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 6 ns (typical)
• Output Current: ±8 mA
• Power Dissipation: 500 mW

Detailed Pin Configuration

The SN74AHC138PWG4 has a total of 16 pins, which are assigned as follows:

1. GND (Ground)
2. A0 (Address Input 0)
3. A1 (Address Input 1)
4. A2 (Address Input 2)
5. /E1 (Enable Input 1)
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. /E2 (Enable Input 2)
15. VCC (Positive Power Supply)
16. GND (Ground)

Functional Features

• Converts a 3-bit binary input into one of eight corresponding outputs
• Enables cascading multiple decoders for larger applications
• Low power consumption and high-speed operation
• Schmitt-trigger inputs for noise immunity
• Wide operating voltage range

Advantages and Disadvantages

Advantages: - High-speed operation allows for quick decoding of input signals - Low power consumption makes it suitable for battery-powered devices - Wide operating voltage range provides flexibility in various applications - Schmitt-trigger inputs ensure reliable operation in noisy environments

Disadvantages: - Limited to 3-bit binary inputs, restricting the number of possible combinations - Output current is limited to ±8 mA, which may not be sufficient for certain applications requiring higher current

Working Principles

The SN74AHC138PWG4 is a decoder/demultiplexer IC that converts a 3-bit binary input into one of eight corresponding outputs. The three address inputs (A0, A1, and A2) determine the selected output line. The enable inputs (/E1 and /E2) control the operation of the decoder.

When the enable inputs are active low, the decoder is enabled, and the selected output line becomes active. The remaining output lines remain inactive. The active output line is determined by the binary value applied to the address inputs.

Detailed Application Field Plans

The SN74AHC138PWG4 finds applications in various fields, including:

1. Address decoding in microcontrollers and microprocessors
2. Memory selection in digital systems
3. Data routing in communication systems
4. Signal demultiplexing in multimedia devices
5. Control logic in industrial automation

Detailed and Complete Alternative Models

1. 74HC138: Similar functionality but operates at a higher voltage range (2 V to 6 V)
2. CD74HC138: Compatible alternative from a different manufacturer
3. 74LS138: TTL-compatible version with slightly different specifications

These alternative models provide similar decoding capabilities and can be used as substitutes for the SN74AHC138PWG4 in various applications.

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