The model number "SN74AVC2T245RSWR" refers to a product manufactured by Texas Instruments. This is a Dual 2-bit, 2-state Bus transceiver with 3-state Outputs and is often used in high-speed logic circuits, especially for interfacing between different voltage levels.
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Pin Function Specifications and Circuit Principles
1. Package and Pin ConfigurationThe SN74AVC2T245RSWR comes in a 16-pin TSSOP (Thin Shrink Small Outline Package). TSSOP packages are compact, with a relatively low-profile design that makes them suitable for high-density applications, while providing the required number of I/O pins in a small space.
2. Pin Function List (Detai LED )The SN74AVC2T245RSWR has 16 pins, and each pin serves a specific function. Below is the detailed pin description:
Pin Number Pin Name Function Description 1 A1 Input/Output for bus A, Bit 1 (high impedance when disabled) 2 B1 Input/Output for bus B, Bit 1 (high impedance when disabled) 3 A2 Input/Output for bus A, Bit 2 (high impedance when disabled) 4 B2 Input/Output for bus B, Bit 2 (high impedance when disabled) 5 OE Output Enable control. Active low. When low, outputs are enabled. 6 GND Ground. Connect to circuit ground. 7 A3 Input/Output for bus A, Bit 3 (high impedance when disabled) 8 B3 Input/Output for bus B, Bit 3 (high impedance when disabled) 9 A4 Input/Output for bus A, Bit 4 (high impedance when disabled) 10 B4 Input/Output for bus B, Bit 4 (high impedance when disabled) 11 A5 Input/Output for bus A, Bit 5 (high impedance when disabled) 12 B5 Input/Output for bus B, Bit 5 (high impedance when disabled) 13 VCC Power supply pin. Connect to positive voltage supply. 14 A6 Input/Output for bus A, Bit 6 (high impedance when disabled) 15 B6 Input/Output for bus B, Bit 6 (high impedance when disabled) 16 A7 Input/Output for bus A, Bit 7 (high impedance when disabled) 3. Circuit Principle OverviewThis device functions as a bus transceiver, meaning it facilitates data transmission between two different buses (A and B). It has two 2-bit transceivers, allowing data to flow in either direction between bus A and bus B when enabled. The "OE" (Output Enable) pin controls whether the outputs are active or in a high-impedance state.
When OE is low, the transceivers are active, allowing data to pass between the buses. When OE is high, the output pins are placed in a high-impedance state (essentially disconnected from the bus), preventing any interference with other devices connected to the same buses.The logic level on pins A and B is typically managed by voltage thresholds, enabling the device to handle different voltage levels between the two buses.
FAQ (Frequently Asked Questions) for SN74AVC2T245RSWR
Q: What is the maximum voltage that can be applied to the VCC pin of the SN74AVC2T245RSWR? A: The maximum voltage applied to the VCC pin should not exceed 3.6V to prevent damage to the IC.
Q: What is the purpose of the OE pin on the SN74AVC2T245RSWR? A: The OE pin controls the output enable function. When OE is low, the outputs are active; when high, the outputs are in a high-impedance state.
Q: Can the SN74AVC2T245RSWR be used in both 3.3V and 5V systems? A: Yes, the SN74AVC2T245RSWR is designed to support voltage-level translation between 3.3V and 5V systems.
Q: How many I/O pins does the SN74AVC2T245RSWR have? A: The SN74AVC2T245RSWR has a total of 8 I/O pins (A1-A7 and B1-B7).
Q: What is the logic family of the SN74AVC2T245RSWR? A: The SN74AVC2T245RSWR belongs to the AVC (Advanced Virtual Channel) logic family, which provides high-speed performance and low-power operation.
Q: What are the voltage thresholds for the SN74AVC2T245RSWR for logic high (VH) and logic low (VL)? A: For a VCC of 3.3V, VH is typically 2V, and VL is typically 0.8V. For 5V systems, VH is typically 3V, and VL is typically 1.5V.
Q: What is the current consumption of the SN74AVC2T245RSWR? A: The typical operating current is around 2mA per channel in active mode, and the device consumes very little power in high-impedance state.
Q: Can the SN74AVC2T245RSWR drive LEDs directly? A: No, the SN74AVC2T245RSWR is not designed to drive LEDs directly as it provides low current output. External drivers or resistors are required.
Q: What is the package type of the SN74AVC2T245RSWR? A: The SN74AVC2T245RSWR comes in a 16-pin TSSOP package, which is small and suited for compact designs.
Q: Can the SN74AVC2T245RSWR be used in high-speed data communication systems? A: Yes, the device supports high-speed data transmission, making it suitable for use in systems that require fast data transfers between different voltage levels.
Q: What happens if the VCC pin is connected incorrectly? A: Connecting the VCC pin incorrectly may cause the IC to malfunction or be permanently damaged. Always ensure correct polarity and voltage level.
Q: Can the SN74AVC2T245RSWR be used with 1.8V logic systems? A: The SN74AVC2T245RSWR can operate at 1.8V, but care should be taken regarding the I/O voltage levels. It's best used with systems operating at 2.5V or higher for reliable logic level translation.
Q: Does the SN74AVC2T245RSWR support 3-state logic? A: Yes, the SN74AVC2T245RSWR supports 3-state logic, with the ability to place the outputs into a high-impedance state.
Q: What are the typical applications for the SN74AVC2T245RSWR? A: This device is typically used in high-speed logic circuits, voltage level shifting, data buses, and system interconnects requiring voltage translation.
Q: What is the temperature range of the SN74AVC2T245RSWR? A: The operating temperature range for the SN74AVC2T245RSWR is typically from -40°C to +125°C.
Q: Can the SN74AVC2T245RSWR be used for bidirectional communication? A: Yes, the device supports bidirectional communication between buses A and B.
Q: What is the propagation delay for the SN74AVC2T245RSWR? A: The typical propagation delay is around 2.5 ns, making it suitable for high-speed applications.
Q: Is the SN74AVC2T245RSWR compatible with I2C or SPI communication? A: The SN74AVC2T245RSWR is not specifically designed for I2C or SPI communication, but it can be used in systems where voltage level translation is needed.
Q: How do I enable the outputs of the SN74AVC2T245RSWR? A: The outputs are enabled by pulling the OE pin low. When OE is high, the outputs are disabled.
Q: How do I protect the inputs and outputs of the SN74AVC2T245RSWR? A: To protect the inputs and outputs, it is recommended to use appropriate current-limiting resistors and to avoid exceeding the voltage specifications for the I/O pins.
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