Encyclopedia Entry: 74ACT257MTCX

Product Overview

Category

The 74ACT257MTCX belongs to the category of integrated circuits (ICs) and specifically falls under the family of multiplexers/demultiplexers.

Use

This IC is primarily used for data multiplexing and demultiplexing applications in digital electronic systems.

Characteristics

• The 74ACT257MTCX is a quad 2-input multiplexer with 3-state outputs.
• It operates on a supply voltage range of 4.5V to 5.5V.
• The IC is designed to provide high-speed performance with low power consumption.
• It offers compatibility with TTL input and output voltage levels.
• The device is capable of driving up to 10 LSTTL loads.

Package and Quantity

The 74ACT257MTCX is available in a small outline surface mount package (TSSOP-16). It is typically sold in reels or tubes, with a quantity of 2500 units per reel/tube.

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage High: 2.0V (minimum), 0.8V (maximum)
• Input Voltage Low: 0.8V (minimum), -0.5V (maximum)
• Output Voltage High: 2.4V (minimum), 2.4V (maximum)
• Output Voltage Low: 0.4V (minimum), 0.4V (maximum)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The 74ACT257MTCX has a total of 16 pins, which are assigned specific functions as follows:

1. A0: Input A0
2. B0: Input B0
3. A1: Input A1
4. B1: Input B1
5. G: Enable Input (Active Low)
6. Y0: Output Y0
7. Y1: Output Y1
8. Y2: Output Y2
9. Y3: Output Y3
10. VCC: Positive Supply Voltage
11. B3: Input B3
12. A3: Input A3
13. B2: Input B2
14. A2: Input A2
15. GND: Ground
16. NC: No Connection

Functional Features

The 74ACT257MTCX offers the following functional features:

• Quad 2-input multiplexer with 3-state outputs.
• Enables data selection from four different inputs (A0-A3, B0-B3) based on the control input (G).
• Provides 3-state outputs (Y0-Y3) that can be independently enabled or disabled.
• High-speed operation and low power consumption make it suitable for various digital electronic systems.

Advantages and Disadvantages

Advantages

• High-speed performance allows for efficient data multiplexing and demultiplexing.
• Low power consumption helps in reducing overall system energy requirements.
• Compatibility with TTL voltage levels ensures easy integration with existing digital circuits.
• 3-state outputs provide flexibility in controlling the output signals.

Disadvantages

• Limited to a maximum supply voltage of 5.5V, which may restrict its use in certain applications requiring higher voltages.
• The small outline surface mount package may require specialized equipment for soldering and handling.

Working Principles

The 74ACT257MTCX operates based on the principles of multiplexing and demultiplexing. It uses the control input (G) to select one of the four input data lines (A0-A3, B0-B3) and routes it to the corresponding output line (Y0-Y3). The 3-state outputs allow for independent enabling or disabling of each output line. This IC operates on a supply voltage range of 4.5V to 5.5V and provides compatibility with TTL input and output voltage levels.

Application Field Plans

The 74ACT257MTCX finds applications in various digital electronic systems, including but not limited to:

1. Data communication systems
2. Multiplexed data buses
3. Address decoding circuits
4. Memory address selection
5. Digital signal processing
6. Microcontroller-based systems

Alternative Models

For users seeking alternative options, the following models can be considered:

1. SN74ACT257: Similar quad 2-input multiplexer with 3-state outputs from Texas Instruments.
2. CD74ACT257: Quad 2-input multiplexer with 3-state outputs from Texas Instruments.
3. MC74ACT257: Quad 2-input multiplexer with 3-state outputs from ON Semiconductor.

These alternative models offer similar functionality and characteristics to the 74ACT257MTCX