Encyclopedia Entry: 74LCX257MTR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Digital Multiplexer
• Characteristics: Low Voltage, Quad 2-Input Multiplexer
• Package: TSSOP-16
• Essence: The 74LCX257MTR is a multiplexer IC that allows the selection of one out of four data inputs to be routed to a single output line.
• Packaging/Quantity: Available in reels of 2500 units.

Specifications

• Supply Voltage: 1.65V to 3.6V
• Logic Family: LCX
• Number of Inputs: 4
• Number of Outputs: 1
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 5.5 ns (typical)

Detailed Pin Configuration

The 74LCX257MTR has a total of 16 pins arranged as follows:

__ __ A1 |1 `--' 16| VCC B1 |2 15| Y A2 |3 14| B B2 |4 13| C G1 |5 74 12| D G2 |6 LCX 11| E Y1 |7 257 10| F GND |8 9 | G ``````````

Functional Features

• The 74LCX257MTR is designed to operate at low voltage levels, making it suitable for battery-powered devices and other low-power applications.
• It features four data inputs (A, B, C, D) and two select inputs (E, F) to control the routing of data.
• The G1 and G2 inputs are used to enable or disable the multiplexer, allowing for power-saving operation when not in use.
• The output Y provides the selected data input based on the select inputs.

Advantages

• Low voltage operation allows for compatibility with a wide range of digital systems.
• Fast propagation delay ensures efficient data routing.
• Small package size (TSSOP-16) enables space-saving designs.
• Power-saving feature helps extend battery life in portable devices.

Disadvantages

• Limited to a 4:1 multiplexing configuration, may not be suitable for applications requiring higher input/output count.
• Not suitable for high-voltage applications due to its low voltage rating.

Working Principles

The 74LCX257MTR operates by using the select inputs (E, F) to determine which of the four data inputs (A, B, C, D) is connected to the output Y. When the enable inputs (G1, G2) are active, the selected data input is passed through to the output. When the enable inputs are inactive, the output is in a high-impedance state.

Detailed Application Field Plans

The 74LCX257MTR can be used in various applications, including: 1. Data multiplexing in communication systems. 2. Address decoding in microcontrollers and memory devices. 3. Input selection in audio/video equipment. 4. Signal routing in test and measurement instruments.

Alternative Models

Other alternative models that offer similar functionality to the 74LCX257MTR include: - SN74LVC257A from Texas Instruments - MC74LCX257 from ON Semiconductor - CD74HC257 from Texas Instruments

These alternative models can be considered based on specific requirements and availability.

In conclusion, the 74LCX257MTR is a low-voltage quad 2-input multiplexer IC that offers fast data routing and power-saving features. It finds applications in various fields, including communication systems, microcontrollers, and audio/video equipment. Alternative models are available for consideration based on specific needs.