DM74AS157M

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data Multiplexer
• Characteristics: High-speed, TTL Logic
• Package: 16-pin DIP (Dual In-line Package)
• Essence: A multiplexer that selects one of four data inputs based on the control inputs
• Packaging/Quantity: Typically sold in reels of 250 units

Specifications

• Supply Voltage: 4.75V to 5.25V
• Operating Temperature Range: -55°C to +125°C
• Input Voltage High Level: 2.0V (min), 0.8V (max)
• Input Voltage Low Level: 0.8V (min), 0.4V (max)
• Output Voltage High Level: 2.7V (min), 3.6V (max)
• Output Voltage Low Level: 0.4V (min), 0.5V (max)
• Propagation Delay Time: 9ns (typical)

Pin Configuration

The DM74AS157M has a total of 16 pins. The pin configuration is as follows:

1. A0 (Data Input A0)
2. B0 (Data Input B0)
3. C0 (Data Input C0)
4. D0 (Data Input D0)
5. GND (Ground)
6. Y (Output)
7. E (Enable Input)
8. A1 (Data Input A1)
9. B1 (Data Input B1)
10. C1 (Data Input C1)
11. D1 (Data Input D1)
12. VCC (Supply Voltage)
13. Y (Output)
14. E (Enable Input)
15. A2 (Data Input A2)
16. B2 (Data Input B2)

Functional Features

The DM74AS157M is a quad 2-input multiplexer with common select inputs (E) and complementary outputs (Y and Y). It allows the selection of one out of four data inputs (A0-A2, B0-B2, C0-C2, D0-D2) based on the control inputs (E).

Advantages and Disadvantages

Advantages: - High-speed operation - TTL logic compatibility - Wide operating temperature range

Disadvantages: - Limited number of input channels (four in this case) - Requires external enable signal for proper functioning

Working Principles

The DM74AS157M operates by using the control inputs (E) to select one of the four data inputs (A0-A2, B0-B2, C0-C2, D0-D2). The selected data input is then routed to the output pins (Y and Y) while the other inputs are ignored. The complementary outputs provide both true and inverted versions of the selected data.

Detailed Application Field Plans

The DM74AS157M can be used in various applications that require data multiplexing, such as:

1. Data communication systems
2. Digital audio/video processing
3. Industrial automation
4. Instrumentation systems
5. Computer peripherals

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the DM74AS157M include:

1. SN74LS157: Low-power Schottky version
2. CD74HC157: High-speed CMOS version
3. MC74ACT157: Advanced CMOS version

These alternative models may have different specifications, pin configurations, and package options, but they serve the same purpose of data multiplexing.

In conclusion, the DM74AS157M is a high-speed TTL logic IC that functions as a quad 2-input data multiplexer. Its compact 16-pin DIP package and wide operating temperature range make it suitable for various applications in data communication, audio/video processing, automation, instrumentation, and computer peripherals.