Encyclopedia Entry: 74FCT257ATQG8

Product Information Overview

• Category: Integrated Circuit (IC)
• Use: Data Selector/Multiplexer
• Characteristics: High-speed, low-power consumption
• Package: TSSOP-16 (Thin Shrink Small Outline Package)
• Essence: Logic IC for data selection and multiplexing
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Logic Family: FCT
• Number of Inputs: 4
• Number of Outputs: 1
• Supply Voltage Range: 4.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 3.5 ns (typical)
• Input Capacitance: 3 pF (typical)
• Output Current: ±24 mA (maximum)

Detailed Pin Configuration

The 74FCT257ATQG8 IC has a total of 16 pins arranged as follows:

__ __ A1 -| 1 16 |- VCC B1 -| 2 15 |- Y A2 -| 3 14 |- B B2 -| 4 13 |- A G1 -| 5 12 |- GND G2 -| 6 11 |- C Y1 -| 7 10 |- D Y2 -| 8 9 |- G ¯¯ ¯¯

Functional Features

• Data selection and multiplexing: The 74FCT257ATQG8 is designed to select one of the four input data lines and route it to the output line based on the control inputs.
• High-speed operation: With a propagation delay time of only 3.5 ns, this IC enables fast data switching.
• Low-power consumption: The 74FCT257ATQG8 is designed to operate with low power requirements, making it suitable for battery-powered devices.

Advantages and Disadvantages

Advantages: - High-speed operation allows for quick data selection and multiplexing. - Low-power consumption extends battery life in portable devices. - Compact TSSOP-16 package saves board space.

Disadvantages: - Limited number of inputs and outputs may not be suitable for complex applications requiring more channels.

Working Principles

The 74FCT257ATQG8 operates by using the control inputs (G1 and G2) to select one of the four input lines (A1, A2, B1, B2) and route it to the output line (Y). When both G1 and G2 are low, the Y output follows the A inputs. Conversely, when either G1 or G2 is high, the Y output is forced to a high impedance state.

Detailed Application Field Plans

The 74FCT257ATQG8 can be used in various applications, including: 1. Data multiplexing in communication systems 2. Address decoding in memory systems 3. Input/output expansion in microcontrollers 4. Signal routing in test and measurement equipment

Detailed and Complete Alternative Models

Some alternative models that serve similar functions to the 74FCT257ATQG8 include: - SN74LS157 - CD4051B - MC14051B

These alternatives offer different specifications and pin configurations, allowing users to choose the most suitable option for their specific application needs.

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