SN74AS138DR

Product Overview

Category

SN74AS138DR belongs to the category of integrated circuits (ICs).

Use

This product is commonly used in digital electronics and microprocessor-based systems.

Characteristics

• High-speed operation
• Low power consumption
• Wide operating voltage range
• Multiple output enable inputs
• Three-state outputs

Package

SN74AS138DR is available in a 16-pin SOIC (Small Outline Integrated Circuit) package.

Essence

The essence of SN74AS138DR lies in its ability to decode binary information and select one out of eight outputs based on the input signals.

Packaging/Quantity

SN74AS138DR is typically packaged in reels, with each reel containing 2500 units.

Specifications

• Supply Voltage: 4.5V to 5.5V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 11 ns (max)
• Output Current: ±24 mA

Detailed Pin Configuration

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

Functional Features

SN74AS138DR is a 3-to-8 line decoder/demultiplexer with active-low outputs. It takes three address inputs (A0, A1, and A2) and three enable inputs (G1, G2A, and G2B). Based on the input combination, one of the eight outputs (Y0 to Y7) is selected and driven low, while the remaining outputs are in a high-impedance state.

Advantages and Disadvantages

Advantages

• High-speed operation allows for efficient processing of digital signals.
• Low power consumption helps in reducing energy usage.
• Wide operating voltage range ensures compatibility with various systems.
• Multiple output enable inputs provide flexibility in controlling the outputs.
• Three-state outputs allow for easy integration with other components.

Disadvantages

• Limited number of address inputs restricts the range of possible input combinations.
• Active-low outputs may require additional circuitry for certain applications.

Working Principles

SN74AS138DR works by decoding the binary information provided through the address inputs (A0, A1, and A2). The enable inputs (G1, G2A, and G2B) control the selection of the output based on the specific input combination. The selected output is driven low, while the remaining outputs are in a high-impedance state.

Detailed Application Field Plans

SN74AS138DR finds applications in various fields, including: 1. Microprocessor-based systems 2. Digital signal processing 3. Memory addressing 4. Data multiplexing 5. Address decoding in memory modules

Detailed and Complete Alternative Models

Some alternative models that serve similar functions to SN74AS138DR include: 1. 74HC138: A CMOS version of the decoder/demultiplexer. 2. CD74HCT138: A high-speed CMOS decoder/demultiplexer. 3. SN54LS138: A low-power Schottky TTL decoder/demultiplexer.

These alternative models offer similar functionality but may have different specifications and characteristics.

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