SN74AVC4T774PWR Detailed explanation of pin function specifications and circuit principle instructions

The part number SN74AVC4T774PWR belongs to the Texas Instruments (TI) brand. It is a quadruple bus switch device with a low voltage and high-speed operation feature, specifically designed for signal routing applications.

Here’s a detailed explanation of the pin function specifications, circuit principle, and pin-out list with usage instructions.

Pin Function Specifications:

The SN74AVC4T774PWR comes in the TSSOP (Thin Shrink Small Outline Package) with 20 pins.

Pin-Out Function Table (20 Pins):

Pin Number Pin Name Function Description 1 A1 Data input pin for Bus 1. 2 B1 Data output pin for Bus 1. 3 C1 Control input pin for Bus 1, determines the enable state of the bus. 4 A2 Data input pin for Bus 2. 5 B2 Data output pin for Bus 2. 6 C2 Control input pin for Bus 2, determines the enable state of the bus. 7 A3 Data input pin for Bus 3. 8 B3 Data output pin for Bus 3. 9 C3 Control input pin for Bus 3, determines the enable state of the bus. 10 A4 Data input pin for Bus 4. 11 B4 Data output pin for Bus 4. 12 C4 Control input pin for Bus 4, determines the enable state of the bus. 13 GND Ground pin. 14 VCC Power supply pin (positive voltage). 15 OE Output enable pin, controls the activation of the bus switches. 16 NC No connect pin (not used in circuit). 17 A1 Data input pin for Bus 1. (As noted above) 18 B1 Data output pin for Bus 1. (As noted above) 19 C1 Control input pin for Bus 1, determines the enable state of the bus. 20 A2 Data input pin for Bus 2. (As noted above)

Circuit Principle:

The SN74AVC4T774PWR device is based on bus switch functionality, meaning it allows the transmission of signals between different buses or systems only when enabled. The bus switches are controlled by the control pins (C1, C2, C3, C4). When these control pins are set to a logic "high," the corresponding data pins (A1, A2, A3, A4) are connected to their output pins (B1, B2, B3, B4). The OE pin is used to enable or disable all the buses' outputs. When OE is set to logic low, the output pins are placed in a high-impedance state, effectively disabling the output. The device is powered by the VCC pin (positive voltage) and referenced to GND (ground).

Frequently Asked Questions (FAQ):

1. What is the supply voltage for the SN74AVC4T774PWR?

The supply voltage range for the SN74AVC4T774PWR is 1.65V to 3.6V.

**2. What is the function of the *OE* pin?**

The OE pin is the Output Enable pin. When it is low, all output pins are disabled (high-impedance state).

3. Can the SN74AVC4T774PWR be used for high-speed applications?

Yes, the device is designed for high-speed operation and can be used in systems where fast signal switching is required.

**4. How many data bus switches does the *SN74AVC4T774PWR* have?**

The device has four separate data bus switches: Bus 1, Bus 2, Bus 3, and Bus 4.

5. What happens when the control pin (C1, C2, C3, C4) is set to logic "high"?

When a control pin is high, the corresponding data input pin (A1, A2, A3, A4) is connected to the output pin (B1, B2, B3, B4).

6. How can I disable a specific bus on the device?

To disable a bus, set the corresponding control pin (C1, C2, C3, C4) to low.

7. What is the output drive capability of the device?

The SN74AVC4T774PWR has a low output resistance, providing strong drive capability suitable for medium to high-speed systems.

8. Is this part compatible with 5V systems?

No, the SN74AVC4T774PWR is designed for 1.65V to 3.6V systems and is not intended for use with 5V logic.

9. What is the importance of the GND pin?

The GND pin is the reference ground for the entire device and is essential for correct operation. Without it, the device will not function as intended.

10. Can I connect the inputs (A1 to A4) directly to 5V logic?

No, the inputs must be within the specified voltage range of 1.65V to 3.6V. Applying higher voltages may damage the device.

11. How does the device behave if the control pins (C1 to C4) are not connected?

If the control pins are left floating, the state of the device will be undefined. It is critical to always connect them to either a high or low logic signal.

12. What does "high-impedance" mean in this context?

"High-impedance" refers to the state where the output pins do not drive any voltage. It essentially disconnects the output from the bus.

13. Can I use this device for bidirectional data transfer?

No, the SN74AVC4T774PWR is designed for unidirectional data transfer, from input to output.

14. What are the thermal specifications for this device?

The maximum junction temperature is 125°C, and the device should be used in environments that do not exceed this limit.

15. Is the device suitable for automotive applications?

Yes, the SN74AVC4T774PWR is rated for use in automotive systems that require low voltage, high-speed signal switching.

16. How do I ensure proper grounding when using the SN74AVC4T774PWR?

Ensure that the GND pin is connected directly to the system ground, and that there is a solid and low-resistance connection to minimize signal noise and interference.

17. Can I use this device in a high-frequency circuit?

Yes, the device supports high-speed operation with minimal delay, making it suitable for high-frequency circuits.

18. What is the maximum current that can be drawn from the output pins?

The maximum current from the output pins is ±24 mA. Exceeding this can damage the device.

19. How do I handle multiple devices in parallel?

Multiple SN74AVC4T774PWR devices can be connected in parallel, but care should be taken to avoid bus contention by ensuring that only one device drives the bus at any given time.

**20. What is the main benefit of using the *SN74AVC4T774PWR* in a circuit?**

The SN74AVC4T774PWR offers high-speed, low-voltage operation with excellent switching characteristics, making it ideal for efficient signal routing and low-power applications.

If you have any further specific requirements or details you'd like to explore, feel free to ask!