Encyclopedia Entry: 74ACT257MTC
Product Overview
Category
The 74ACT257MTC belongs to the category of integrated circuits (ICs).
Use
This IC is commonly used in digital electronic systems for data multiplexing applications.
Characteristics
- The 74ACT257MTC is a quad 2-input multiplexer with 3-state outputs.
- It operates on a supply voltage range of 4.5V to 5.5V.
- This IC offers high-speed operation and low power consumption.
- It is compatible with TTL (Transistor-Transistor Logic) inputs and outputs.
- The 74ACT257MTC has a wide operating temperature range, making it suitable for various environments.
Package
The 74ACT257MTC is available in a small outline surface mount package (TSSOP-16).
Essence
The essence of the 74ACT257MTC lies in its ability to select one of four data inputs and route it to a single output line based on the control inputs.
Packaging/Quantity
This IC is typically sold in reels or tubes, with each reel containing a specific quantity of units. Please refer to the manufacturer's specifications for detailed packaging information.
Specifications
- Supply Voltage Range: 4.5V to 5.5V
- Input Voltage Range: 0V to Vcc
- Output Voltage Range: 0V to Vcc
- Operating Temperature Range: -40°C to +85°C
- Propagation Delay Time: <10ns
- Maximum Power Dissipation: 500mW
Detailed Pin Configuration
The 74ACT257MTC has a total of 16 pins arranged as follows:
+---+--+---+
A1 --|1 +--+ 16|-- Vcc
B1 --|2 15|-- A0
C1 --|3 14|-- B0
D1 --|4 13|-- C0
GND --|5 74ACT257MTC 12|-- D0
GND --|6 11|-- Y
D2 --|7 10|-- G2
C2 --|8 9|-- G1
+----------+
Functional Features
- Quad 2-input multiplexer: The 74ACT257MTC can select one of four data inputs (A, B, C, or D) and route it to the output line (Y) based on the control inputs.
- 3-state outputs: The IC provides three-state outputs, allowing multiple devices to share the same bus without interference.
Advantages and Disadvantages
Advantages
- High-speed operation: The 74ACT257MTC offers fast switching times, making it suitable for applications requiring quick data selection.
- Low power consumption: This IC is designed to minimize power consumption, contributing to energy-efficient electronic systems.
- Wide operating temperature range: The ability to operate in a wide temperature range enhances its versatility.
Disadvantages
- Limited input/output options: The quad 2-input configuration restricts the number of selectable inputs and outputs.
- Small package size: The TSSOP-16 package may pose challenges during manual soldering or handling.
Working Principles
The 74ACT257MTC operates by using the control inputs (G1 and G2) to determine which data input (A, B, C, or D) is connected to the output line (Y). When both control inputs are low, the output is in a high-impedance state (Z), allowing other devices to drive the bus. The selected data input is then transmitted to the output line.
Detailed Application Field Plans
The 74ACT257MTC finds applications in various digital electronic systems, including: - Data multiplexing in microcontrollers and microprocessors - Address decoding in memory systems - Bus switching in communication devices - Input/output expansion in embedded systems
Detailed and Complete Alternative Models
Some alternative models that offer similar functionality to the 74ACT257MTC include: - 74HC257: A CMOS version of the quad 2-input multiplexer with 3-state outputs. - CD4052: A dual 4-channel analog multiplexer/demultiplexer IC. - SN74LS157: A quad 2-line to 1-line data selector/multiplexer IC.
These alternative models can be considered based on specific requirements and compatibility with the existing system.
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기술 솔루션에 74ACT257MTC 적용과 관련된 10가지 일반적인 질문과 답변을 나열하세요.
Sure! Here are 10 common questions and answers related to the application of 74ACT257MTC in technical solutions:
Q: What is the 74ACT257MTC? A: The 74ACT257MTC is a quad 2-input multiplexer with 3-state outputs, commonly used in digital logic circuits.
Q: What is the purpose of a multiplexer? A: A multiplexer is used to select one of several input signals and route it to a single output line based on control inputs.
Q: How many inputs does the 74ACT257MTC have? A: The 74ACT257MTC has four data inputs (A, B, C, D) and two select inputs (S0, S1).
Q: How many outputs does the 74ACT257MTC have? A: The 74ACT257MTC has four outputs (Y0, Y1, Y2, Y3), each corresponding to one of the data inputs.
Q: What is the function of the select inputs (S0, S1)? A: The select inputs determine which data input is connected to the outputs. The combination of S0 and S1 determines the active input.
Q: Can the 74ACT257MTC be used for bidirectional data transfer? A: No, the 74ACT257MTC is a unidirectional multiplexer and can only route data from inputs to outputs.
Q: What is the voltage supply range for the 74ACT257MTC? A: The 74ACT257MTC operates with a voltage supply range of 4.5V to 5.5V.
Q: What is the maximum operating frequency of the 74ACT257MTC? A: The maximum operating frequency of the 74ACT257MTC is typically around 200 MHz.
Q: Can the outputs of the 74ACT257MTC be disabled? A: Yes, the 74ACT257MTC has 3-state outputs that can be disabled by setting the enable input (G) to a high logic level.
Q: What are some common applications of the 74ACT257MTC? A: The 74ACT257MTC is commonly used in data routing and selection applications, such as multiplexing multiple data sources into a single output or selecting different memory banks.