Overview
The SN74AVC8T245PWRG4, produced by Texas Instruments, is an 8-bit dual-supply noninverting bus transceiver designed for bidirectional voltage level translation. This device is optimized to operate with supply voltages ranging from 1.2 V to 3.6 V, making it suitable for universal low-voltage bidirectional translation between various voltage nodes such as 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V.
The SN74AVC8T245 is used for asynchronous communication between data buses, allowing data transmission from the A bus to the B bus or vice versa based on the direction-control (DIR) input. The output-enable (OE) input can disable the outputs, effectively isolating the buses.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | TSSOP (PW) | - |
| Number of Pins | 24 | - |
| Supply Voltage Range (VCCA and VCCB) | 1.2 to 3.6 | V |
| Operating Temperature Range | -40 to 125 | °C |
| Data Rates | 170 Mbps (VCCA or VCCB < 1.8 V), 320 Mbps (VCCA and VCCB ≥ 1.8 V) | Mbps |
| Output Current | +12 mA / -12 mA | mA |
| ESD Protection | 8000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model | V |
Key Features
- Latch-up performance exceeds 100 mA per JESD 78, Class II.
- ESD protection exceeds JESD 22 standards: 8000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- Control inputs (DIR and OE) are referenced to VCCA.
- VCC isolation feature – both ports are in the high-impedance state when either VCC input is at GND.
- Ioff supports partial power-down mode operation.
- Fully configurable dual-rail design allows each port to operate over the full 1.4-V to 3.6-V power-supply range.
- I/Os are 4.6-V tolerant.
- Compatible with single-supply systems and can be replaced later with a '245 function with minimal PCB redesign.
Applications
The SN74AVC8T245PWRG4 is suitable for a variety of applications requiring bidirectional voltage level translation, including:
- Asynchronous communication between data buses in mixed-voltage systems.
- Low-voltage bidirectional translation between different voltage nodes (e.g., 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V).
- Partial power-down applications where Ioff circuitry is necessary to prevent damaging current backflow.
- Systems requiring high ESD protection and latch-up performance.
Q & A
- What is the primary function of the SN74AVC8T245PWRG4?
The primary function is to act as an 8-bit dual-supply noninverting bus transceiver with configurable voltage level translation.
- What is the supply voltage range for VCCA and VCCB?
The supply voltage range for both VCCA and VCCB is from 1.2 V to 3.6 V.
- What are the data rates supported by the SN74AVC8T245PWRG4?
The device supports data rates of up to 170 Mbps when VCCA or VCCB is less than 1.8 V, and up to 320 Mbps when both VCCA and VCCB are 1.8 V or higher.
- How does the direction-control (DIR) input work?
The DIR input determines the direction of data flow. When DIR is high, data flows from the A bus to the B bus, and when DIR is low, data flows from the B bus to the A bus.
- What is the purpose of the output-enable (OE) input?
The OE input can be used to disable the outputs, effectively isolating the buses when set high.
- What is the VCC isolation feature?
The VCC isolation feature allows both ports to be in the high-impedance state when either VCC input is at GND.
- Does the SN74AVC8T245PWRG4 support partial power-down mode?
Yes, the device supports partial power-down mode using Ioff circuitry to prevent damaging current backflow.
- What is the operating temperature range of the SN74AVC8T245PWRG4?
The operating temperature range is from -40°C to 125°C.
- Is the SN74AVC8T245PWRG4 ESD protected?
Yes, it exceeds JESD 22 standards for ESD protection: 8000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- What is the package type and number of pins for the SN74AVC8T245PWRG4?
The package type is TSSOP (PW) with 24 pins.
