SN74LVC2T45DCUR Detailed explanation of pin function specifications and circuit principle instructions

The component you're referring to, the SN74LVC2T45DCUR, is from Texas Instruments (TI). It is a dual voltage-level translator designed for converting voltage levels between two systems (e.g., converting logic voltage levels between 3.3V and 5V systems).

Package:

The SN74LVC2T45DCUR comes in a TSSOP-8 package (8 pins).

Pin Function Specifications:

Pin Number Pin Name Function 1 A1 Input pin, A-side. This pin receives the logic input from the low-voltage side. 2 A2 Input pin, A-side. This pin receives the logic input from the low-voltage side. 3 GND Ground pin. Connect to the system ground (0V). 4 VCCA Supply voltage for A-side. This pin is connected to the voltage supply for the low-voltage side. 5 OE Output Enable. When low, the output driver is enabled; when high, the output is in high-impedance state. 6 B1 Output pin, B-side. This pin provides the translated logic output for the high-voltage side. 7 B2 Output pin, B-side. This pin provides the translated logic output for the high-voltage side. 8 VCCB Supply voltage for B-side. This pin is connected to the voltage supply for the high-voltage side.

Circuit Principle and Functionality:

The SN74LVC2T45DCUR is a bi-directional voltage-level translator designed for 2-state logic signal level conversion. It features:

Dual Channels: It supports two channels for voltage translation, meaning you can convert two signals at the same time. Bi-Directional Translation: The voltage translation works in both directions. The A-side pins can send signals to the B-side and vice versa. Voltage Compatibility: It supports voltage levels from 1.65V to 5.5V on both sides, making it highly versatile in systems with varying voltage requirements.

The device uses Pass-gate transistor s for translating the signals. These transistors act as a switch that passes the signal from the A-side to the B-side and vice versa, based on the voltage levels supplied to the VCCA and VCCB pins. The OE (Output Enable) pin allows control of whether the translated output should be active or in a high-impedance state.

Pin Description (All 8 pins):

Pin 1 (A1): Input, low-voltage logic input (A-side). Pin 2 (A2): Input, low-voltage logic input (A-side). Pin 3 (GND): Ground pin, should be connected to 0V. Pin 4 (VCCA): Supply voltage pin for A-side, typically 1.65V to 5.5V. Pin 5 (OE): Output Enable, controlling whether outputs are active or in high-impedance state. Pin 6 (B1): Output, high-voltage logic output (B-side). Pin 7 (B2): Output, high-voltage logic output (B-side). Pin 8 (VCCB): Supply voltage pin for B-side, typically 1.65V to 5.5V.

20 FAQ (Frequently Asked Questions):

What is the input voltage range for SN74LVC2T45DCUR? The input voltage range for the SN74LVC2T45DCUR is from 1.65V to 5.5V on both A and B sides. Can the SN74LVC2T45DCUR support bidirectional signal translation? Yes, it supports bidirectional signal translation between A-side and B-side. What is the purpose of the OE (Output Enable) pin on the SN74LVC2T45DCUR? The OE pin controls the output state. When it is low, the outputs are enabled; when high, the outputs are in a high-impedance state. Can the SN74LVC2T45DCUR handle different voltage levels for A and B sides? Yes, it can handle different voltage levels on A and B sides, supporting voltage levels from 1.65V to 5.5V. What kind of application would the SN74LVC2T45DCUR be used for? This device is used for voltage-level translation in mixed voltage systems, such as between 3.3V logic and 5V logic. What is the maximum frequency at which the SN74LVC2T45DCUR can operate? The device operates at high speeds, typically up to 100 MHz, depending on the specific conditions and voltage levels. What is the function of the A-side and B-side on the SN74LVC2T45DCUR? The A-side is the low-voltage side, and the B-side is the high-voltage side for voltage-level translation. How does the SN74LVC2T45DCUR handle power supply? It requires two power supply inputs: VCCA for the A-side and VCCB for the B-side. What is the output voltage level on the B-side when using the SN74LVC2T45DCUR? The output voltage on the B-side will correspond to the logic levels of the B-side voltage supply (VCCB).

What happens if the OE pin is high?

When OE is high, the outputs (B1 and B2) will be in a high-impedance state, effectively disconnecting them from the circuit.

Can I use the SN74LVC2T45DCUR in a 3.3V and 5V system?

Yes, this device is ideal for translating signals between 3.3V and 5V systems.

What is the TSSOP-8 package size for the SN74LVC2T45DCUR?

The TSSOP-8 package has 8 pins and measures approximately 4.4mm x 3.0mm in size.

Can I use the SN74LVC2T45DCUR in both directions for translation?

Yes, the SN74LVC2T45DCUR is bi-directional, allowing voltage-level translation in both directions.

What are the key characteristics of the SN74LVC2T45DCUR?

Key characteristics include low-voltage logic support, bi-directional voltage translation, and high-speed operation.

How should I connect the VCCA and VCCB pins?

VCCA should be connected to the A-side voltage supply, and VCCB should be connected to the B-side voltage supply.

Can the SN74LVC2T45DCUR be used for I2C or SPI communication?

Yes, it can be used for I2C or SPI communication where voltage-level translation is required between different voltage systems.

What is the maximum current the outputs of the SN74LVC2T45DCUR can drive?

The outputs can typically drive up to 8mA.

What happens if I connect the wrong voltage to the A-side or B-side?

Connecting the wrong voltage may damage the device or prevent proper voltage translation. Always ensure the voltage levels are within the specified range for each side.

What is the recommended operating temperature range for the SN74LVC2T45DCUR?

The recommended operating temperature range is from -40°C to 125°C.

Can the SN74LVC2T45DCUR be used in automotive applications?

Yes, it can be used in automotive applications, but the temperature range and reliability should be verified for specific automotive needs.

Conclusion:

The SN74LVC2T45DCUR is a versatile and efficient voltage-level translator designed for bi-directional voltage translation in systems with different logic voltage levels. It supports both 3.3V and 5V logic systems, ensuring compatibility in mixed-voltage environments.