SN74LVC8T245RHLR Detailed explanation of pin function specifications and circuit principle instructions

SN74LVC8T245RHLR Detai LED explanation of pin function specifications and circuit principle instructions

The part number "SN74LVC8T245RHLR" belongs to Texas Instruments. It's a 8-bit transceiver designed for high-speed digital signal processing and is part of the LVC (Low Voltage CMOS) family.

Packaging:

Package Type: TSSOP (Thin Shrink Small Outline Package) Pin Count: 20 pins

Pin Function List:

Below is a detai LED breakdown of all the pins, their functions, and their specific usage for the SN74LVC8T245RHLR part number. This transceiver operates in bidirectional data flow between two buses (one for A and one for B) and includes control pins for enable and direction control.

Pin Number Pin Name Pin Function Description 1 A1 A data input/output pin for Bus A. Bidirectional data flow, controlled by the direction control. 2 A2 A data input/output pin for Bus A. Bidirectional data flow, controlled by the direction control. 3 A3 A data input/output pin for Bus A. Bidirectional data flow, controlled by the direction control. 4 A4 A data input/output pin for Bus A. Bidirectional data flow, controlled by the direction control. 5 A5 A data input/output pin for Bus A. Bidirectional data flow, controlled by the direction control. 6 A6 A data input/output pin for Bus A. Bidirectional data flow, controlled by the direction control. 7 A7 A data input/output pin for Bus A. Bidirectional data flow, controlled by the direction control. 8 GND Ground pin for the IC. 9 B1 B data input/output pin for Bus B. Bidirectional data flow, controlled by the direction control. 10 B2 B data input/output pin for Bus B. Bidirectional data flow, controlled by the direction control. 11 B3 B data input/output pin for Bus B. Bidirectional data flow, controlled by the direction control. 12 B4 B data input/output pin for Bus B. Bidirectional data flow, controlled by the direction control. 13 B5 B data input/output pin for Bus B. Bidirectional data flow, controlled by the direction control. 14 B6 B data input/output pin for Bus B. Bidirectional data flow, controlled by the direction control. 15 B7 B data input/output pin for Bus B. Bidirectional data flow, controlled by the direction control. 16 DIR Direction control pin. Determines the data flow direction between Bus A and Bus B. When DIR is high, Bus A → Bus B, and vice versa. 17 OE Output Enable pin. When OE is low, outputs are enabled; when high, outputs are disabled. 18 VCC Power supply pin. Typically, it should be connected to a +3.3V or +5V voltage source. 19 NC No connection pin. It is not internally connected and is typically used for mechanical or packaging purposes. 20 NC No connection pin. It is not internally connected and is typically used for mechanical or packaging purposes.

Pin Function Details:

Data I/O Pins (A1-A7, B1-B7): These pins allow for bidirectional data transfer between two buses (A and B). The direction of data flow is controlled by the DIR pin, which determines whether data is transferred from Bus A to Bus B or vice versa. Ground Pin (GND): The ground connection of the device ensures proper electrical operation. Direction Pin (DIR): This pin controls the direction of data flow. If DIR is set high, data will flow from Bus A to Bus B. If DIR is set low, data will flow from Bus B to Bus A. Output Enable (OE): This pin enables or disables the output buffers. When OE is high, the outputs are disabled, and when it is low, data is allowed to flow out of the device. Power Supply Pin (VCC): This pin provides power to the IC and must be connected to a voltage source (typically 3.3V or 5V). No Connection Pins (NC): These are unused pins and do not affect the functionality of the device. They are typically not connected internally and are used to facilitate the physical layout of the package.

FAQ (Frequently Asked Questions) for SN74LVC8T245RHLR:

Q: What is the maximum operating voltage of the SN74LVC8T245RHLR? A: The maximum operating voltage is 5.5V. Q: What is the logic level voltage for the SN74LVC8T245RHLR? A: The logic level voltage for the device is typically 3.3V for LVC operation, but it is compatible with both 3.3V and 5V logic levels. Q: Can I use this device to interface 5V and 3.3V logic circuits? A: Yes, the SN74LVC8T245RHLR can safely interface 5V and 3.3V logic levels due to its low-voltage CMOS technology. Q: What happens when the OE pin is high? A: When the OE (Output Enable) pin is high, the outputs are disabled, meaning no data will be transferred to or from the A or B buses. Q: What happens when the DIR pin is high? A: When the DIR pin is high, data will flow from Bus A to Bus B. Q: What happens when the DIR pin is low? A: When the DIR pin is low, data will flow from Bus B to Bus A. Q: How many data pins are there on the device? A: There are a total of 14 data pins (A1-A7, B1-B7) on the SN74LVC8T245RHLR. Q: What type of package is the SN74LVC8T245RHLR available in? A: The SN74LVC8T245RHLR is available in a 20-pin TSSOP package. Q: What is the purpose of the NC pins? A: The NC (No Connection) pins are not internally connected and are used for packaging purposes only.

Q: Can I use this device in a bidirectional data bus system?

A: Yes, the device is designed specifically for bidirectional data transfer between two buses.

Q: What is the input/output voltage range for the SN74LVC8T245RHLR?

A: The input/output voltage range is from 0V to VCC, where VCC is typically 3.3V or 5V.

Q: What is the maximum current rating for the outputs?

A: The maximum current output for each pin is 8mA in both the high and low states.

Q: How does the device perform with high-speed signals?

A: The SN74LVC8T245RHLR is designed for high-speed applications and operates at a maximum propagation delay of 5ns.

Q: What is the significance of the direction control in this device?

A: The direction control (DIR) pin determines whether the device is transmitting data from Bus A to Bus B or vice versa.

Q: Is there any internal pull-up or pull-down resistor on the DIR pin?

A: No, there is no internal pull-up or pull-down resistor on the DIR pin; it requires an external signal to control the data direction.

Q: What is the maximum switching frequency of this device?

A: The maximum switching frequency for the SN74LVC8T245RHLR is 250 MHz.

Q: Can this device be used in a multi-transceiver configuration?

A: Yes, the SN74LVC8T245RHLR can be used in multi-transceiver configurations as long as the direction control is managed properly.

Q: Is the device compatible with 3.3V logic circuits?

A: Yes, the device is fully compatible with 3.3V logic circuits.

Q: Can this device drive LED displays?

A: The device is not designed to drive LED displays directly but can be used in digital circuits interfacing with other logic that drives LEDs.

Q: What is the power consumption of the SN74LVC8T245RHLR?

A: The typical power consumption is very low, especially with output disable features, making it suitable for low-power applications.

This concludes the detailed explanation of the SN74LVC8T245RHLR part number, including the pin functions, packaging, and FAQ.