Overview
The SN74LVC4245ADWRG4, produced by Texas Instruments, is an 8-bit (octal) noninverting bus transceiver designed for voltage translation between 3.3-V and 5-V environments. This device allows for asynchronous communication between data buses and features two separate supply rails: VCCB for the B port set at 3.3 V and VCCA for the A port set at 5 V. The transceiver can transmit data from the A bus to the B bus or vice versa, controlled by the direction-control (DIR) input. Additionally, the output-enable (OE) input can be used to disable the device, effectively isolating the buses.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Number of Bits | Number of bits in the transceiver | 8-bit (octal) |
| VCCB (B Port) | Supply voltage for B port | 3.3 V |
| VCCA (A Port) | Supply voltage for A port | 5 V |
| Propagation Delay (Low to High Transition) | Propagation delay time at 3.3 V and 25°C | Up to 6.3 ns |
| Output Enable (OE) | Input to enable or disable the outputs | Active low |
| Operating Temperature Range | Temperature range for device operation | -40°C to 85°C |
| Package Type | Type of package the device is available in | 24-SOIC |
| Junction-to-Ambient Thermal Resistance (RθJA) | Thermal resistance from junction to ambient | 90.7 °C/W |
Key Features
- Voltage Translation: Translates signals between 3.3-V and 5-V environments, allowing for communication between different voltage level systems.
- 3-State Outputs: Outputs can be set to high, low, or high-impedance state, controlled by the output-enable (OE) input.
- Direction Control: Data transmission direction is controlled by the DIR input, allowing data to be transmitted from A to B or B to A.
- High-Speed Operation: Maximum propagation delay of 6.3 ns at 3.3 V, ensuring fast data transmission.
- Wide Operating Temperature Range: Operates from -40°C to 85°C, making it suitable for various environmental conditions.
Applications
- Embedded Systems: Used in embedded systems where voltage level translation is necessary between different components.
- Industrial Automation: Suitable for industrial automation systems that require reliable and fast data transmission between different voltage level devices.
- Server and Networking Equipment: Used in server and networking equipment to facilitate communication between components operating at different voltage levels.
- Cable Modem Termination Systems: Employed in cable modem termination systems for efficient data transmission.
- LED Displays and Other Digital Systems: Used in various digital systems including LED displays where voltage translation is required.
Q & A
- What is the primary function of the SN74LVC4245ADWRG4?
The primary function is to act as an 8-bit noninverting bus transceiver with voltage translation between 3.3-V and 5-V environments.
- What are the supply voltages for the A and B ports?
The A port operates at 5 V (VCCA), and the B port operates at 3.3 V (VCCB).
- How is the data transmission direction controlled?
The data transmission direction is controlled by the direction-control (DIR) input.
- What is the purpose of the output-enable (OE) input?
The OE input is used to enable or disable the outputs, effectively isolating the buses when disabled.
- What is the maximum propagation delay at 3.3 V and 25°C?
The maximum propagation delay is up to 6.3 ns.
- What is the operating temperature range of the device?
The device operates from -40°C to 85°C.
- In what type of package is the SN74LVC4245ADWRG4 available?
The device is available in a 24-SOIC package.
- What is the junction-to-ambient thermal resistance (RθJA) of the device?
The RθJA is 90.7 °C/W.
- Can the SN74LVC4245ADWRG4 be used in safety-critical applications?
It is recommended to consult the datasheet and application notes for specific guidance on using this device in safety-critical applications.
- How should unused inputs of the device be handled?
All unused inputs must be held at the associated VCC or GND to ensure proper device operation.
