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74LVC1T45 single-bit dual-supply bus transceiver

Creation date: Oct 22, 2023 11:45pm     Last modified date: Oct 22, 2023 11:45pm   Last visit date: Jul 14, 2024 8:09am
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Oct 22, 2023  ( 1 post )  
Janey Tang (semic)

The 74LVC1T45 is a single-bit dual-supply bus transceiver (or voltage level translator) integrated circuit. It is designed to convert logic signals from one voltage level to another, making it particularly useful for interfacing between devices operating at different voltage levels. Here are some key features and details about the 74LVC1T45:

Key Features:

Voltage Level Translation: The 74LVC1T45 is designed for bidirectional voltage level translation between two independent supply voltage ranges, making it useful for connecting devices with different voltage requirements.

Single-Bit, Dual-Supply: It is a single-bit transceiver, meaning it can translate one data bit at a time. It operates with two supply voltages, one on each side of the device.

Direction Control: The direction of data transfer can be controlled through the direction control (DIR) pin, allowing data to flow in either direction.

Broad Voltage Range Compatibility: It is compatible with a wide range of supply voltage levels, often between 1.2V and 5.5V.

3-State Outputs: The device has 3-state outputs, allowing you to effectively disconnect the I/O pins from the bus when not actively driving a signal.

High-Speed Operation: The 74LVC1T45 typically operates at high speeds, making it suitable for applications requiring fast data transfer.

ESD Protection: It often includes ESD (Electrostatic Discharge) protection, which safeguards against electrostatic discharge events that can damage sensitive electronics.


The 74LVC1T45 is commonly used in various applications, including:

Voltage Level Translation: Its primary purpose is to facilitate communication between devices operating at different voltage levels, ensuring signal integrity.

Mixed-Voltage Systems: It is used in mixed-voltage systems, where different parts of a circuit or different components operate at distinct voltage levels.

Bi-directional Data Buses: It is applied in applications with bidirectional data buses where data needs to be transferred between devices with differing voltage requirements.

Logic Level Shifting: Used to shift logic signal levels between different voltage domains.

I2C and SPI Communication: It is employed in interfacing devices using I2C or SPI communication protocols that operate at different voltage levels.

Microcontroller Interfaces: Used in microcontroller-based systems to interface with sensors or peripheral devices operating at different voltage levels.

Buffering Signals: It can be used to buffer or isolate signals, preventing them from affecting or being affected by other parts of a circuit.

The 74LVC1T45 is a useful component in mixed-voltage systems, helping to bridge the gap between devices that operate at different voltage levels. It ensures that data can be transferred reliably and accurately while maintaining compatibility between the devices.