SN74AHCT138PWE4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: High-speed, low-power, 3-to-8 line decoder/demultiplexer
• Package: TSSOP-16 (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: 2V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 6 ns (typical)
• Output Current: ±8 mA
• Power Dissipation: 500 mW (max)

Detailed Pin Configuration

The SN74AHCT138PWE4 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

• Converts a 3-bit binary input into one of eight corresponding output lines
• Enables easy selection of specific output lines based on the input combination
• High-speed operation allows for efficient decoding in various applications
• Low-power consumption makes it suitable for battery-powered devices
• Multiple enable inputs provide flexibility in controlling the decoder/demultiplexer

Advantages and Disadvantages

Advantages: - High-speed operation enables quick decoding of input signals - Low-power consumption prolongs battery life in portable devices - Compact TSSOP-16 package saves board space - Multiple enable inputs offer enhanced control options

Disadvantages: - Limited to 3-bit binary input, restricting the number of output combinations - Propagation delay may affect real-time applications with strict timing requirements

Working Principles

The SN74AHCT138PWE4 is a decoder/demultiplexer IC that converts a 3-bit binary input into one of eight corresponding output lines. The three address inputs (A0, A1, and A2) determine which output line is activated. The enable inputs (E1 and E2) control the operation of the decoder.

When the enable inputs are active (typically low), the decoder responds to the address inputs and activates the corresponding output line. The selected output line goes high, while all other output lines remain low. This allows for easy selection and routing of specific signals based on the input combination.

Detailed Application Field Plans

The SN74AHCT138PWE4 finds applications in various fields, including:

1. Address Decoding: Used in microcontrollers and memory systems to decode address signals and select specific memory locations.
2. Data Routing: Enables multiplexing of data signals in communication systems, allowing efficient transmission and reception.
3. Display Control: Facilitates driving of multiple display segments or digits in digital signage, calculators, and electronic instruments.
4. Programmable Logic: Utilized in programmable logic devices (PLDs) to implement complex logic functions by combining multiple decoders.

Detailed and Complete Alternative Models

1. 74HC138: Similar 3-to-8 line decoder/demultiplexer IC with a wider supply voltage range (2V to 6V).
2. CD74HCT138E: Equivalent decoder/demultiplexer IC in a DIP-16 package, suitable for through-hole mounting.
3. SN54AHCT138W: Pin-compatible version of SN74AHCT138PWE4 with extended temperature range (-55°C to +125°C).

These alternative models provide similar functionality and can be used as substitutes based on specific requirements.

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