DM74AS258M

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Digital Multiplexer
• Characteristics: High-speed, TTL Logic
• Package: 16-pin DIP (Dual In-line Package)
• Essence: A multiplexer is a digital circuit that selects one of several input signals and forwards it to a single output line.
• Packaging/Quantity: Typically sold in reels or tubes containing multiple units.

Specifications

• Supply Voltage: 4.75V to 5.25V
• Input Voltage: 0V to Vcc
• Operating Temperature Range: -55°C to +125°C
• Output Current: ±8mA
• Propagation Delay Time: 9ns (max)

Detailed Pin Configuration

1. A0: Address Input 0
2. A1: Address Input 1
3. A2: Address Input 2
4. E: Enable Input
5. B: Data Input B
6. C: Data Input C
7. D: Data Input D
8. Y: Multiplexed Output
9. GND: Ground
10. Y: Multiplexed Output
11. D: Data Input D
12. C: Data Input C
13. B: Data Input B
14. E: Enable Input
15. A2: Address Input 2
16. A1: Address Input 1
17. A0: Address Input 0
18. Vcc: Supply Voltage

Functional Features

• The DM74AS258M is a 3-to-8 line digital multiplexer.
• It has three address inputs (A0, A1, A2) to select one of the eight data inputs (B, C, D).
• The enable input (E) controls the operation of the multiplexer.
• The selected data input is forwarded to the multiplexed output (Y).

Advantages and Disadvantages

Advantages: - High-speed operation due to TTL logic. - Compact 16-pin DIP package for easy integration into circuits. - Wide operating temperature range (-55°C to +125°C) allows usage in various environments.

Disadvantages: - Limited number of inputs (3-to-8), may not be suitable for applications requiring more inputs. - Requires external components for proper functioning.

Working Principles

• The DM74AS258M uses a combination of address inputs and an enable input to select one of the data inputs.
• When the enable input (E) is high, the selected data input is forwarded to the output.
• The address inputs (A0, A1, A2) determine which data input is selected based on their binary combination.

Detailed Application Field Plans

The DM74AS258M can be used in various applications, including: 1. Data routing and selection in digital systems. 2. Multiplexing multiple data sources onto a single line. 3. Address decoding in memory systems. 4. Signal switching in communication systems. 5. Control unit selection in microprocessor-based systems.

Detailed and Complete Alternative Models

1. SN74LS151: 8-line to 1-line Data Selector/Multiplexer
2. CD4051B: 8-channel Analog Multiplexer/Demultiplexer
3. MC14051B: 8-channel Analog Multiplexer/Demultiplexer

These alternative models offer similar functionality to the DM74AS258M and can be considered as replacements depending on specific requirements.

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