SN74AHCT138PWG4

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 based on the selected 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
• Input Capacitance: 3 pF (typical)

Detailed Pin Configuration

The SN74AHCT138PWG4 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. /E2 (Enable Input 2)
11. Y4 (Output 4)
12. Y5 (Output 5)
13. Y6 (Output 6)
14. Y7 (Output 7)
15. VCC (Positive Power Supply)
16. GND (Ground)

Functional Features

• Decodes a 3-bit binary input into one of eight outputs
• Enables cascading of multiple decoders for larger applications
• Low power consumption and high-speed operation
• Schmitt-trigger inputs for noise immunity
• Output current capability allows direct driving of LEDs or other devices

Advantages and Disadvantages

Advantages: - High-speed operation enables quick response in decoding applications - Low power consumption makes it suitable for battery-powered devices - Noise immunity provided by Schmitt-trigger inputs ensures reliable operation - Can directly drive output devices, eliminating the need for additional components

Disadvantages: - Limited to 3-bit input decoding, not suitable for larger-scale applications - TSSOP package may require careful handling during assembly

Working Principles

The SN74AHCT138PWG4 operates based on the principle of binary decoding. The three address inputs (A0, A1, A2) represent a binary number, and the selected line is determined by the combination of these inputs. When an enable input (/E1 or /E2) is active, the decoder converts the binary input into a corresponding output. The selected output line becomes active (low) while all other output lines remain inactive (high).

Detailed Application Field Plans

The SN74AHCT138PWG4 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 with slightly different electrical characteristics
2. CD74HCT138: Higher voltage tolerance and wider temperature range
3. SN54AHCT138: Same functionality in a different package (DIP-16)

These alternative models provide similar decoding capabilities and can be used as substitutes depending on specific requirements.

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