The model "SN74AVC4T245RSVR" belongs to Texas Instruments (TI), which is a well-known semiconductor company. The device is part of the SN74AVC4T245 family, a high-speed CMOS logic device. The package code RSVR typically refers to a specific surface-mount package style for this device, such as TSSOP (Thin Shrink Small Outline Package) or a similar package type. However, the exact details about the package would need to be confirmed by looking at the datasheet or package specifications.
Pin Function Specifications and Circuit Principle:
The SN74AVC4T245RSVR is a 4-bit bidirectional voltage-level translator, meaning it is designed to interface different voltage levels between two systems, such as logic circuits operating at different supply voltages.
Here is a breakdown of the pin functions:
Pin Count and Package:
The device typically comes in a 20-pin TSSOP package (depending on the exact version of the model). The 20 pins are as follows:
Pin Function Table for SN74AVC4T245RSVR:
Pin Number Pin Name Function Description 1 A1 Data input (A-side, lower voltage side) 2 A2 Data input (A-side, lower voltage side) 3 A3 Data input (A-side, lower voltage side) 4 A4 Data input (A-side, lower voltage side) 5 B1 Data output (B-side, higher voltage side) 6 B2 Data output (B-side, higher voltage side) 7 B3 Data output (B-side, higher voltage side) 8 B4 Data output (B-side, higher voltage side) 9 OE Output enable control (active low) 10 VCC1 Power supply (A-side voltage) 11 VCC2 Power supply (B-side voltage) 12 GND1 Ground (A-side) 13 GND2 Ground (B-side) 14 DIR Direction control pin (when high, data flows from A to B; when low, data flows from B to A) 15 A1 Data input (A-side, lower voltage side) 16 A2 Data input (A-side, lower voltage side) 17 A3 Data input (A-side, lower voltage side) 18 A4 Data input (A-side, lower voltage side) 19 B1 Data output (B-side, higher voltage side) 20 B2 Data output (B-side, higher voltage side)Pin Description:
A1, A2, A3, A4 (Pins 1, 2, 3, 4): These are the data input pins for the lower voltage side (A-side) of the device. They are responsible for receiving the logic signals from the device operating at a lower voltage (e.g., 1.8V, 2.5V).
B1, B2, B3, B4 (Pins 5, 6, 7, 8): These are the data output pins for the higher voltage side (B-side). They provide the translated logic signals to a device operating at a higher voltage (e.g., 3.3V, 5V).
OE (Pin 9): The output enable pin. When this pin is low, the outputs (B-side) are enabled, allowing data to flow through the device. When it is high, the outputs are disabled (high-impedance state).
VCC1 (Pin 10): Power supply for the A-side (lower voltage side). It typically connects to the lower voltage supply, such as 1.8V or 2.5V.
VCC2 (Pin 11): Power supply for the B-side (higher voltage side). It typically connects to the higher voltage supply, such as 3.3V or 5V.
GND1 (Pin 12): Ground for the A-side (lower voltage side).
GND2 (Pin 13): Ground for the B-side (higher voltage side).
DIR (Pin 14): Direction control pin. This pin determines the direction of data flow. When DIR is high, data flows from A to B, and when DIR is low, data flows from B to A.
Circuit Principle:
The SN74AVC4T245RSVR operates by shifting voltage levels between two logic systems, allowing them to communicate despite operating at different voltages. It uses the direction control (DIR) and output enable (OE) pins to manage the data flow, ensuring the correct data is translated in both directions.
20 FAQ for SN74AVC4T245RSVR:
Q1: What is the primary function of the SN74AVC4T245RSVR? A1: The SN74AVC4T245RSVR is a 4-bit bidirectional voltage-level translator that allows communication between devices operating at different voltage levels.
Q2: How many pins does the SN74AVC4T245RSVR have? A2: The SN74AVC4T245RSVR has 20 pins.
Q3: What is the significance of the DIR pin? A3: The DIR pin controls the direction of data flow. When DIR is high, data flows from A to B, and when DIR is low, data flows from B to A.
Q4: What does the OE pin control? A4: The OE pin enables or disables the output pins. When OE is low, outputs are enabled; when OE is high, outputs are in a high-impedance state.
Q5: Can the device support both 3.3V and 5V systems? A5: Yes, the SN74AVC4T245RSVR is designed to interface systems with voltages from 1.65V to 5.5V, making it compatible with both 3.3V and 5V systems.
Q6: What is the operating voltage range for the A-side (VCC1)? A6: The A-side (VCC1) can operate within a voltage range of 1.65V to 3.6V.
Q7: What is the operating voltage range for the B-side (VCC2)? A7: The B-side (VCC2) can operate within a voltage range of 2.3V to 5.5V.
Q8: Can the device handle multiple voltage levels simultaneously? A8: Yes, the SN74AVC4T245RSVR supports bidirectional voltage level shifting, enabling the interface between two devices at different voltage levels.
Q9: What is the typical current consumption of the device? A9: The typical current consumption is relatively low, but the exact value depends on the voltage levels and the load. Check the datasheet for precise figures.
Q10: Is the device compatible with I2C or SPI communication? A10: Yes, it can be used with I2C, SPI, or any other type of digital communication that requires level translation.
Q11: Can this device be used in a bidirectional communication setup? A11: Yes, the SN74AVC4T245RSVR is specifically designed for bidirectional data transfer between different voltage systems.
Q12: How do I control the direction of data flow? A12: The direction of data flow is controlled via the DIR pin, which switches the flow from A to B or vice versa.
Q13: Can the SN74AVC4T245RSVR be used for 1.8V systems? A13: Yes, the device can support systems with as low as 1.8V on the A-side, making it ideal for interfacing with lower voltage devices.
Q14: What are the temperature and operating conditions for the device? A14: The operating temperature range is typically between -40°C and +125°C. Refer to the datasheet for specific details on thermal performance.
Q15: Does the device have any built-in protection against voltage spikes? A15: The device includes some inherent protection against voltage spikes, but external protection circuits may still be necessary for extreme conditions.
Q16: How does the device handle high-speed data transmission? A16: The device supports high-speed data transfer with low propagation delay, making it suitable for high-frequency applications.
Q17: Is there a maximum operating frequency for this device? A17: The device can operate up to frequencies of 100 MHz depending on the load conditions and voltage levels.
Q18: Can I use the device in a 2-wire interface setup? A18: Yes, it can be used in a 2-wire interface setup like I2C, as long as voltage level shifting is required.
Q19: What is the role of the GND pins? A19: The GND pins (GND1 and GND2) provide a common ground reference for both the A-side and B-side of the device.
Q20: Where can I find more detailed specifications for the SN74AVC4T245RSVR? A20: More detailed specifications, including electrical characteristics and timing diagrams, can be found in the datasheet provided by Texas Instruments.
The detailed explanations above should give you a thorough understanding of the SN74AVC4T245RSVR and its functionality. Let me know if you need further clarification or additional information!
