SN74LVC646APW

Product Overview

• Category: Integrated Circuit
• Use: Bus Transceiver and Register
• Characteristics: Low-Voltage CMOS Octal Bus Transceiver and Register
• Package: TSSOP (Thin Shrink Small Outline Package)
• Essence: This integrated circuit serves as a bidirectional transceiver and register for bus communication in electronic systems.
• Packaging/Quantity: Available in reels of 2000 units

Specifications

• Supply Voltage Range: 1.65V to 3.6V
• High-Level Input Voltage: 2V to VCC + 0.5V
• Low-Level Input Voltage: -0.5V to 0.8V
• High-Level Output Voltage: VCC - 0.5V
• Low-Level Output Voltage: 0.5V
• Maximum Input Current: ±10mA
• Maximum Output Current: ±32mA
• Operating Temperature Range: -40°C to 85°C

Detailed Pin Configuration

The SN74LVC646APW has a total of 24 pins, which are assigned specific functions as follows:

1. OE (Output Enable) - Active low output enable input
2. DIR (Direction Control) - Direction control input
3. A1-A8 (Data Bus A) - Bidirectional data bus A
4. B1-B8 (Data Bus B) - Bidirectional data bus B
5. GND (Ground) - Ground reference
6. VCC (Supply Voltage) - Positive supply voltage
7. OE (Output Enable) - Active low output enable input
8. DIR (Direction Control) - Direction control input
9. C1-C8 (Data Bus C) - Bidirectional data bus C
10. D1-D8 (Data Bus D) - Bidirectional data bus D
11. GND (Ground) - Ground reference
12. VCC (Supply Voltage) - Positive supply voltage

Functional Features

• Bidirectional data transfer between buses A and B, controlled by the DIR input
• Output enable control (OE) to disable the outputs
• 3-state outputs for bus isolation
• Low-voltage operation suitable for battery-powered devices
• Schmitt-trigger inputs for noise immunity
• ESD protection on all inputs and outputs

Advantages and Disadvantages

Advantages: - Low-voltage operation allows compatibility with various systems - Bidirectional data transfer simplifies bus communication - Schmitt-trigger inputs provide noise immunity - ESD protection ensures reliability in harsh environments

Disadvantages: - Limited maximum output current may restrict use in high-power applications - TSSOP package may require careful handling during assembly

Working Principles

The SN74LVC646APW functions as a bidirectional transceiver and register by controlling the direction of data flow between two buses (A and B) based on the input provided to the DIR pin. When DIR is set to logic low, data is transferred from bus A to bus B, and when DIR is set to logic high, data is transferred from bus B to bus A. The OE pin is used to enable or disable the outputs.

Detailed Application Field Plans

The SN74LVC646APW is commonly used in various electronic systems that require bidirectional data transfer between buses. Some specific application fields include:

1. Microcontroller Interfacing: The IC can be used to interface microcontrollers with external devices, such as memory modules or peripheral chips.
2. Communication Systems: It can facilitate data exchange between different communication interfaces, such as UART, SPI, or I2C.
3. Industrial Automation: The IC enables communication between different modules in industrial automation systems, such as PLCs (Programmable Logic Controllers) and sensors.
4. Automotive Electronics: It can be utilized in automotive systems for bus communication between different electronic control units (ECUs).
5. Consumer Electronics: The IC finds applications in consumer electronics devices that require bidirectional data transfer, such as set-top boxes or gaming consoles.

Detailed and Complete Alternative Models

1. SN74LVC245APW: Octal Bus Transceiver with 3-State Outputs
2. SN74LVC541APW: Octal Buffer/Line Driver with 3-State Outputs
3. SN74LVC573APW: Octal D-Type Flip-Flop with 3-State Outputs
4. SN74LVC646ADW: Low-Voltage CMOS Octal Bus Transceiver and Register (SOIC package)
5. SN74LVC646ARGYR: Low-Voltage CMOS Octal Bus Transceiver and Register (QFN package)

These alternative models offer similar functionality to the SN74LVC646APW and can be considered based on specific requirements and availability.

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