DM74AS157N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Data Multiplexer
• Characteristics: High-speed, TTL Logic, Quad 2-to-1 MUX
• Package: DIP (Dual In-line Package)
• Essence: The DM74AS157N is a quad 2-to-1 data multiplexer IC that operates at high speeds and uses TTL logic. It is commonly used in digital circuits to select one of the two input data sources and route it to the output based on the control inputs.
• Packaging/Quantity: The DM74AS157N is typically available in a DIP package with a quantity of 1 per package.

Specifications

• Supply Voltage: 4.75V to 5.25V
• Input Voltage: 0V to Vcc
• Output Voltage: 0V to Vcc
• Operating Temperature: -55°C to +125°C
• Propagation Delay: 9ns (typical)
• Input Capacitance: 10pF (typical)
• Output Current: ±8mA

Pin Configuration

The DM74AS157N has a total of 16 pins arranged as follows:

__ __ A1 |1 \__/ 16| Vcc B1 |2 15| Y1 C1 |3 14| Y2 D1 |4 13| B2 GND |5 12| A2 A0 |6 11| B0 B0 |7 10| C0 C0 |8 9| D0 ‾‾ ‾‾

Functional Features

• Quad 2-to-1 data multiplexer
• High-speed operation
• TTL logic compatibility
• Low power consumption
• Wide operating temperature range
• Easy to integrate into digital circuits

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient data selection. - TTL logic compatibility ensures easy integration with existing digital circuits. - Low power consumption helps in reducing overall power requirements. - Wide operating temperature range enables usage in various environments.

Disadvantages: - Limited to 2-to-1 data multiplexing, not suitable for higher order multiplexing. - Requires external control inputs for selecting the desired data source.

Working Principles

The DM74AS157N operates based on the principles of data multiplexing. It has four input data sources (A, B, C, D) and two control inputs (A0, B0). The control inputs determine which pair of inputs is selected and routed to the output pins (Y1, Y2).

When A0 and B0 are both low, input A is selected and connected to the output. When A0 is high and B0 is low, input B is selected. Similarly, when A0 is low and B0 is high, input C is selected. Finally, when both A0 and B0 are high, input D is selected.

The selected input is then passed through internal logic gates and provided as the output. The DM74AS157N operates at high speeds, allowing for quick data selection and transmission.

Detailed Application Field Plans

The DM74AS157N finds applications in various digital systems where data multiplexing is required. Some common application fields include:

1. Communication Systems: Used for data routing and switching in telecommunication networks.
2. Data Acquisition Systems: Enables selection and processing of multiple data sources in measurement and control systems.
3. Digital Signal Processing: Used for data selection and routing in signal processing algorithms.
4. Multiplexed Displays: Enables switching between multiple display inputs in applications like LED screens.

Detailed and Complete Alternative Models

1. SN74LS157N: Similar quad 2-to-1 data multiplexer IC with TTL logic compatibility.
2. CD74HC157E: Quad 2-to-1 data multiplexer IC with high-speed CMOS logic.
3. MC74ACT157N: Quad 2-to-1 data multiplexer IC with advanced CMOS technology.

These alternative models offer similar functionality to the DM74AS157N and can be used as replacements based on specific requirements.

In conclusion, the DM74AS157N is a high-speed quad 2-to-1 data multiplexer IC that finds applications in various digital systems. Its TTL logic compatibility, low power consumption, and wide operating temperature range make it suitable for integration into different environments.