Encyclopedia Entry: 74FST3253QSR

Product Overview

Category

The 74FST3253QSR belongs to the category of integrated circuits (ICs) and specifically falls under the group of multiplexer/demultiplexer (MUX/DEMUX) ICs.

Use

This IC is primarily used for signal routing and switching applications in electronic circuits. It enables the selection and connection of multiple input signals to a single output or vice versa.

Characteristics

• The 74FST3253QSR is a high-speed, low-power, dual 4-channel analog multiplexer/demultiplexer.
• It operates on a wide supply voltage range of 2V to 5.5V, making it suitable for various electronic systems.
• This IC offers low ON-resistance and low leakage current, ensuring minimal signal distortion and power consumption.
• It features a break-before-make switching action, preventing any momentary short-circuits during signal transitions.

Package and Quantity

The 74FST3253QSR is available in a small-outline package (SOIC) with 16 pins. It is typically sold in reels or tubes containing a quantity of 250 units per package.

Specifications

• Supply Voltage Range: 2V to 5.5V
• ON-Resistance: 6Ω (typical)
• Leakage Current: 1nA (maximum)
• Operating Temperature Range: -40°C to +85°C
• Input/Output Capacitance: 5pF (typical)

Pin Configuration

The pin configuration of the 74FST3253QSR is as follows:

___________ | | A0 -|1 16|- VCC A1 -|2 15|- B0 A2 -|3 14|- B1 A3 -|4 13|- B2 EN -|5 12|- B3 GND -|6 11|- Y0 Y1 -|7 10|- Y1 Y2 -|8 9|- Y3 |___________|

Functional Features

• The 74FST3253QSR offers independent control of each multiplexer/demultiplexer channel through the A0-A3 address inputs.
• It provides a single enable input (EN) to activate or deactivate the IC, allowing for power-saving operation.
• This IC ensures low crosstalk and high isolation between channels, maintaining signal integrity.
• It exhibits fast switching speeds, enabling efficient data transmission in time-critical applications.

Advantages and Disadvantages

Advantages

• Wide supply voltage range allows compatibility with various electronic systems.
• Low ON-resistance and leakage current minimize signal distortion and power consumption.
• Break-before-make switching action prevents short-circuits during signal transitions.
• High-speed operation facilitates efficient data transmission.

Disadvantages

• Limited number of channels (dual 4-channel) may not be suitable for applications requiring a higher number of inputs/outputs.
• Availability in SOIC package only might limit its use in certain space-constrained designs.

Working Principles

The 74FST3253QSR operates based on the principles of analog multiplexing and demultiplexing. When the enable input (EN) is active, the address inputs (A0-A3) determine which channel is selected for routing the input signals to the output pins (Y0-Y3). The break-before-make switching action ensures that there is no overlap or short-circuiting during the transition between different channels.

Application Field Plans

The 74FST3253QSR finds applications in various electronic systems, including but not limited to: - Audio and video signal routing in multimedia devices. - Data acquisition systems for selecting different sensor inputs. - Communication systems for switching between multiple channels. - Test and measurement equipment for signal routing and switching.

Alternative Models

Some alternative models that offer similar functionality to the 74FST3253QSR include: - CD4051B: 8-channel analog multiplexer/demultiplexer IC. - SN74HC4851: 16-channel analog multiplexer/demultiplexer IC. - ADG1408: 8-channel precision analog switch IC.

These alternatives provide options with varying channel counts and specifications, allowing designers to choose the most suitable IC for their specific application requirements.

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