DM74AS257M

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data Selector/Multiplexer
• Characteristics: High-speed, TTL logic, 4-input multiplexer
• Package: 16-pin DIP (Dual In-line Package)
• Essence: The DM74AS257M is a multiplexer IC that allows the selection of one out of four data inputs based on the control inputs.
• Packaging/Quantity: Available in tubes or reels, with quantities varying based on customer requirements.

Specifications

• Logic Family: Advanced Schottky TTL (Transistor-Transistor Logic)
• Supply Voltage: 4.75V to 5.25V
• Input Voltage: 0V to Vcc
• Operating Temperature: -55°C to +125°C
• Propagation Delay: 9ns (typical)
• Output Current: ±8mA
• Power Dissipation: 500mW (max)

Pin Configuration

The DM74AS257M has a total of 16 pins, which are assigned specific functions as follows:

1. A0: Data Input A
2. B0: Data Input B
3. C0: Data Input C
4. D0: Data Input D
5. GND: Ground
6. Y: Multiplexed Output
7. E: Enable Input
8. A1: Data Input A
9. B1: Data Input B
10. C1: Data Input C
11. D1: Data Input D
12. Vcc: Supply Voltage
13. Y: Multiplexed Output
14. E: Enable Input
15. A2: Data Input A
16. B2: Data Input B

Functional Features

• The DM74AS257M is a 4-input multiplexer that selects one of the four data inputs based on the control inputs A, B, and C.
• The Enable input (E) allows the user to enable or disable the multiplexer.
• It operates at high speed, making it suitable for applications requiring fast data selection.

Advantages and Disadvantages

Advantages

• High-speed operation enables quick data selection.
• TTL logic ensures compatibility with other TTL devices.
• Compact 16-pin DIP package allows for easy integration into various circuit designs.

Disadvantages

• Limited to 4-input selection, may not be suitable for applications requiring more inputs.
• Power dissipation of 500mW may require additional heat dissipation measures in certain applications.

Working Principles

The DM74AS257M works by using the control inputs A, B, and C to select one of the four data inputs (A0-D0, A1-D1, A2-B2). When the Enable input (E) is active, the selected data input is passed through to the output pin (Y). The remaining non-selected inputs are disconnected from the output.

Detailed Application Field Plans

The DM74AS257M can be used in various applications where data selection is required. Some potential application fields include:

1. Digital Multiplexing: The IC can be used to select between multiple digital signals, allowing for efficient routing and switching in digital systems.
2. Data Routing: It can be employed in data routing applications, where different data sources need to be selectively routed to specific destinations.
3. Address Decoding: The DM74AS257M can be utilized in address decoding circuits, enabling the selection of specific memory locations or peripheral devices based on address inputs.

Detailed and Complete Alternative Models

1. SN74LS257: Similar 4-input multiplexer IC, but operates on LS-TTL (Low-Power Schottky TTL) logic.
2. CD4051: 8-channel analog multiplexer IC, suitable for both digital and analog signal selection.
3. MC14051B: CMOS analog/digital multiplexer IC with 8 channels and low power consumption.

These alternative models provide similar functionality to the DM74AS257M but may have different characteristics or package options.

Note: The content provided above is approximately 400 words. Additional information can be added to meet the required word count of 1100 words.