Encyclopedia Entry: 74ACT251PC

Product Information Overview

• Category: Integrated Circuit (IC)
• Use: Data Selector/Multiplexer
• Characteristics: High-speed, low-power consumption
• Package: DIP (Dual In-line Package)
• Essence: Logic gate with 8-input multiplexer functionality
• Packaging/Quantity: Sold individually or in bulk packs

Specifications

• Logic Family: ACT
• Number of Inputs: 8
• Number of Outputs: 1
• Supply Voltage: 5V
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 4.5 ns (typical)
• Output Current: ±24 mA

Detailed Pin Configuration

The 74ACT251PC has a total of 16 pins arranged as follows:

┌───┬───┐ S0 ─┤1 16├─ Vcc S1 ─┤2 15├─ GND S2 ─┤3 14├─ Y S3 ─┤4 13├─ I7 S4 ─┤5 12├─ I6 S5 ─┤6 11├─ I5 S6 ─┤7 10├─ I4 S7 ─┤8 9├─ I3 └─────┘

Functional Features

The 74ACT251PC is a high-speed data selector/multiplexer IC that allows the selection of one out of eight input lines based on the binary value applied to the select inputs (S0-S7). It features a low-power consumption design and operates on a 5V supply voltage. The IC has a propagation delay of approximately 4.5 ns, making it suitable for applications requiring fast switching.

Advantages and Disadvantages

Advantages: - High-speed operation - Low power consumption - Wide operating temperature range - Compact DIP package for easy integration

Disadvantages: - Limited number of inputs and outputs - Requires external components for complete functionality

Working Principles

The 74ACT251PC utilizes a combination of logic gates to implement the multiplexer functionality. The select inputs (S0-S7) determine which input line is connected to the output (Y). By applying the appropriate binary value to the select inputs, the desired input can be selected. The IC operates by rapidly switching between the input lines based on the applied select inputs.

Detailed Application Field Plans

The 74ACT251PC finds application in various digital systems where data selection or multiplexing is required. Some common application fields include:

1. Data communication systems
2. Digital signal processing
3. Microprocessor-based systems
4. Memory address decoding
5. Control circuitry

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the 74ACT251PC are:

1. 74HC251: High-speed CMOS logic family with 8-input multiplexer functionality.
2. CD4051: Analog multiplexer/demultiplexer IC with 8 channels.
3. SN54LS151: TTL logic family multiplexer with 8 inputs and 1 output.

These alternative models can be considered based on specific requirements such as power consumption, speed, or compatibility with other components.

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