SN74AVC4T245RGYR Detailed explanation of pin function specifications and circuit principle instructions

The part number "SN74AVC4T245RGYR" belongs to Texas Instruments (TI). This is a part of their AVC (Advanced Voltage Compatible) family, designed for voltage-level translation between different logic voltage levels.

Pin Function Specifications and Circuit Principle:

The SN74AVC4T245RGYR is a quad 2-bit voltage-level translator with 4 channels that are 2-bit bi-directional. The device is primarily used for interfacing between different voltage levels (for example, translating between 3.3V and 5V logic signals).

Package Type:

The SN74AVC4T245RGYR comes in the RGY package type, which is a WQFN-20 (20-pin Wettable Flank Quad Flat Package).

Pinout and Detailed Pin Function (20-pin WQFN-20 Package):

Pin Number Pin Name Function Description 1 A1 2-bit Input A, low voltage side (A1) 2 A2 2-bit Input A, low voltage side (A2) 3 A3 2-bit Input A, low voltage side (A3) 4 A4 2-bit Input A, low voltage side (A4) 5 B1 2-bit Output B, high voltage side (B1) 6 B2 2-bit Output B, high voltage side (B2) 7 B3 2-bit Output B, high voltage side (B3) 8 B4 2-bit Output B, high voltage side (B4) 9 DIR1 Direction Control for Input 1 (DIR1) 10 DIR2 Direction Control for Input 2 (DIR2) 11 GND Ground Pin (GND) 12 GND Ground Pin (GND) 13 Vcc1 Power Supply Pin for Low Voltage Side (Vcc1) 14 Vcc2 Power Supply Pin for High Voltage Side (Vcc2) 15 OE1 Output Enable for Output 1 (OE1) 16 OE2 Output Enable for Output 2 (OE2) 17 A5 2-bit Input A, low voltage side (A5) 18 A6 2-bit Input A, low voltage side (A6) 19 B5 2-bit Output B, high voltage side (B5) 20 B6 2-bit Output B, high voltage side (B6) Pin Function Descriptions: A1-A6: These are the low-voltage side input pins that receive the signals from the system operating at a lower voltage level (for example, 3.3V). B1-B6: These are the high-voltage side output pins that transmit the translated signals to the system operating at a higher voltage level (for example, 5V). DIR1-DIR2: These pins control the direction of the data flow (input or output). When set high, the data flows from A to B, and when set low, the data flows from B to A. OE1-OE2: These are the output enable pins. When high, they enable the outputs. When low, they disable the outputs. Vcc1 and Vcc2: These are the power supply pins for the low and high voltage sides, respectively. GND: Ground pins for the device.

Circuit Principle:

The SN74AVC4T245 operates by using two separate power supplies: one for the low-voltage side (Vcc1) and one for the high-voltage side (Vcc2). The voltage levels of the signals are translated based on the logic level set on these power supply pins. The device allows bi-directional communication and supports various voltage level translations, making it suitable for interfacing different logic families operating at different voltage levels.

FAQ - Frequently Asked Questions (20 Questions)

Q1: What is the operating voltage range for SN74AVC4T245RGYR? A1: The SN74AVC4T245RGYR supports a voltage range from 1.65V to 5.5V for the high voltage side (Vcc2) and from 1.65V to 3.6V for the low voltage side (Vcc1).

Q2: How many pins does the SN74AVC4T245RGYR have? A2: The SN74AVC4T245RGYR has 20 pins in a WQFN-20 package.

Q3: What is the maximum data rate supported by the SN74AVC4T245RGYR? A3: The device supports a maximum data rate of 125 Mbps.

Q4: Can the direction control pins (DIR1, DIR2) be tied to ground or supply? A4: Yes, the direction control pins (DIR1, DIR2) can be tied to either ground or the supply to set the data direction.

Q5: Is it possible to use the SN74AVC4T245RGYR for unidirectional data transmission? A5: Yes, although the SN74AVC4T245RGYR is bi-directional, it can also be configured for unidirectional data transmission by controlling the direction pins.

Q6: What is the purpose of the output enable pins (OE1, OE2)? A6: The output enable pins (OE1, OE2) control whether the output drivers are enabled or disabled. When high, the outputs are enabled; when low, the outputs are disabled.

Q7: Can the device be used to translate voltage levels between 3.3V and 5V systems? A7: Yes, the SN74AVC4T245RGYR is ideal for translating between different voltage levels like 3.3V and 5V.

Q8: What is the recommended operating temperature range for the SN74AVC4T245RGYR? A8: The recommended operating temperature range is -40°C to +125°C.

Q9: Is the SN74AVC4T245RGYR suitable for use in automotive applications? A9: Yes, it can be used in automotive applications as it supports extended temperature ranges and meets high-performance requirements.

Q10: What are the maximum output current ratings for the SN74AVC4T245RGYR? A10: The maximum output current is 24 mA for both the high and low voltage sides.

Q11: Can the SN74AVC4T245RGYR be used with logic families other than TTL? A11: Yes, it is compatible with various logic families, including TTL, CMOS, and others.

Q12: What is the internal architecture of the SN74AVC4T245RGYR? A12: The device features CMOS logic gates for voltage level shifting and bi-directional data transmission.

Q13: Does the device require external components for operation? A13: No, the SN74AVC4T245RGYR does not require any external components for basic operation.

Q14: Can the SN74AVC4T245RGYR handle mixed voltage levels on different channels? A14: Yes, the device can handle mixed voltage levels on different channels, allowing flexible interfacing.

Q15: How is the voltage translation achieved in the SN74AVC4T245RGYR? A15: Voltage translation is achieved through CMOS logic circuits that shift the voltage levels from the low side (Vcc1) to the high side (Vcc2).

Q16: Can the device be used for level shifting on a single bus? A16: Yes, the SN74AVC4T245RGYR can be used for voltage level shifting on a single bus with multiple devices.

Q17: Are there any limitations on the number of devices that can be connected? A17: There are no specific limitations, but the performance of the device may degrade if too many devices are connected to the same bus.

Q18: Can the SN74AVC4T245RGYR be used in logic-level shifting for I2C or SPI communication? A18: Yes, the device can be used for level shifting in protocols like I2C and SPI.

Q19: What is the power consumption of the SN74AVC4T245RGYR? A19: The typical supply current is 1 mA, with a maximum of 5 mA.

Q20: Is the SN74AVC4T245RGYR available in other package types? A20: Yes, the SN74AVC4T245 is also available in other package types such as TSSOP and SSOP.

This detailed guide covers the pin functions and specifications, and the frequently asked questions that are commonly encountered with the SN74AVC4T245RGYR part. Let me know if you need further elaboration or more questions answered!