SN74AVC4T245PWR Detailed explanation of pin function specifications and circuit principle instructions
The model SN74AVC4T245PWR belongs to Texas Instruments (TI). It is a Quad-Bidirectional Voltage-Level Translator designed to provide bidirectional voltage translation between different voltage domains in digital circuits.
Pin Function Specifications:
The SN74AVC4T245PWR is a 16-pin device in a TSSOP (Thin Shrink Small Outline Package).
Pin Number Pin Name Pin Function 1 A1 Input/Output of the A-side (Low-voltage side). 2 A2 Input/Output of the A-side (Low-voltage side). 3 A3 Input/Output of the A-side (Low-voltage side). 4 A4 Input/Output of the A-side (Low-voltage side). 5 A5 Input/Output of the A-side (Low-voltage side). 6 A6 Input/Output of the A-side (Low-voltage side). 7 A7 Input/Output of the A-side (Low-voltage side). 8 A8 Input/Output of the A-side (Low-voltage side). 9 B1 Input/Output of the B-side (High-voltage side). 10 B2 Input/Output of the B-side (High-voltage side). 11 B3 Input/Output of the B-side (High-voltage side). 12 B4 Input/Output of the B-side (High-voltage side). 13 B5 Input/Output of the B-side (High-voltage side). 14 B6 Input/Output of the B-side (High-voltage side). 15 B7 Input/Output of the B-side (High-voltage side). 16 B8 Input/Output of the B-side (High-voltage side). A1-A8 are the 8 pins on the low-voltage side of the translator (typically a lower voltage like 1.8V, 2.5V, 3.3V). B1-B8 are the 8 pins on the high-voltage side (usually higher voltages like 3.3V, 5V).Pin Functionality Summary:
The SN74AVC4T245PWR provides a bidirectional level translation between two voltage domains. The A and B pins can be configured as inputs or outputs, based on the direction control (which is determined by the DIR pin).
When DIR is HIGH, data is transferred from A-side (low voltage) to B-side (high voltage). When DIR is LOW, data is transferred from B-side (high voltage) to A-side (low voltage).Important Usage Notes:
DIR Pin: Controls the direction of data flow (input or output). VCCA: This is the supply voltage for the A-side. Typically, VCCA can range from 1.65V to 3.6V. VCCB: This is the supply voltage for the B-side, which can range from 1.65V to 5.5V. GND: The ground connection for the device. The device is designed to automatically adjust signal levels between different voltage standards, making it suitable for use in systems that operate at different voltages.20 Frequently Asked Questions (FAQ) About SN74AVC4T245PWR:
What is the voltage range for VCCA and VCCB in the SN74AVC4T245PWR? Answer: VCCA can range from 1.65V to 3.6V, while VCCB can range from 1.65V to 5.5V.
How does the SN74AVC4T245PWR achieve voltage level translation? Answer: The device uses bidirectional voltage-level translation through automatic adjustment of signal levels between different voltage domains (A-side and B-side).
What is the maximum operating frequency for the SN74AVC4T245PWR? Answer: The maximum operating frequency is typically 100 MHz, but it depends on the voltage levels and other operating conditions.
What is the purpose of the DIR pin on the SN74AVC4T245PWR? Answer: The DIR pin determines the direction of signal translation. A HIGH signal on DIR enables translation from A-side to B-side, while a LOW signal enables translation from B-side to A-side.
Can the SN74AVC4T245PWR be used for 5V to 3.3V level translation? Answer: Yes, the SN74AVC4T245PWR can handle voltage translation between 5V and 3.3V, making it ideal for interfacing components with different operating voltages.
Is the SN74AVC4T245PWR suitable for bi-directional data transmission? Answer: Yes, it is specifically designed for bidirectional data transmission, with automatic switching between input and output modes.
Can the SN74AVC4T245PWR work with multiple devices at the same time? Answer: Yes, it can support communication between multiple devices, but the direction of translation must be controlled via the DIR pin.
What is the power supply voltage for the SN74AVC4T245PWR? Answer: The device requires two separate supply voltages: VCCA for the A-side (1.65V to 3.6V) and VCCB for the B-side (1.65V to 5.5V).
How does the SN74AVC4T245PWR protect against overvoltage? Answer: The device includes internal protection circuitry to prevent damage from signals that exceed the specified voltage range for either VCCA or VCCB.
Is the SN74AVC4T245PWR compatible with I2C or SPI communication? Answer: Yes, it can be used with I2C or SPI buses for level translation between different voltage systems.
What is the current consumption of the SN74AVC4T245PWR? Answer: The current consumption is typically low, but it depends on the load and operating conditions. Refer to the datasheet for specific values.
Can the SN74AVC4T245PWR handle high-speed data transmission? Answer: Yes, it can handle data transmission at speeds up to 100 MHz, depending on the voltage levels and specific operating conditions.
What happens if the voltage on either the A-side or B-side exceeds the maximum specified voltage? Answer: The device has internal protection to handle small overvoltage conditions, but excessive overvoltage could damage the IC, so it is important to stay within the specified voltage limits.
How does the SN74AVC4T245PWR behave when not powered on? Answer: When the device is not powered, it will not perform any voltage translation, and the pins may float, so proper external pull-up or pull-down resistors are recommended.
What is the maximum capacitance for each pin on the SN74AVC4T245PWR? Answer: The maximum capacitance for each pin is typically specified in the datasheet, but it is generally quite low to ensure high-speed operation.
Can the SN74AVC4T245PWR be used in automotive or industrial applications? Answer: Yes, it can be used in a wide range of applications, including automotive and industrial, as long as the voltage requirements match.
Does the SN74AVC4T245PWR support 3.3V-to-5V translation in both directions? Answer: Yes, it can perform bidirectional voltage level translation between 3.3V and 5V.
What are the thermal management requirements for the SN74AVC4T245PWR? Answer: The device requires proper PCB layout for heat dissipation, with attention to ambient temperature and power dissipation to avoid overheating.
Is the SN74AVC4T245PWR available in other package types? Answer: Yes, Texas Instruments offers the SN74AVC4T245 in various packages such as TSSOP, SOIC, and others.
What is the recommended way to implement the SN74AVC4T245PWR in a circuit? Answer: The device should be properly powered with VCCA and VCCB connected to their respective voltage sources, and the DIR pin must be correctly controlled to set the direction of translation.
The SN74AVC4T245PWR is an essential component for projects that involve interfacing logic devices with different voltage requirements, and it offers flexibility in many digital circuits requiring bidirectional signal translation.
