Overview
The SN74AVC8T245PWR is an 8-bit, noninverting, dual-supply bus transceiver produced by Texas Instruments. This device is designed for asynchronous communication between data buses and supports bidirectional voltage-level translation. It operates with two separate configurable power-supply rails, allowing each port to function over a wide voltage range from 1.2 V to 3.6 V. The device is optimized for use in various low-voltage applications, enabling universal translation between different voltage nodes such as 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| Supply Voltage Range (VCCA, VCCB) | 1.2 | 3.6 | V |
| Input Voltage Range (A port, B port) | -0.5 | 4.6 | V |
| Control Input Voltage Range | -0.5 | 4.6 | V |
| Maximum Data Rate (VCCA < 1.8 V or VCCB < 1.8 V) | 170 | Mbps | |
| Maximum Data Rate (VCCA ≥ 1.8 V and VCCB ≥ 1.8 V) | 320 | Mbps | |
| Output Current | 12 | mA | |
| Package Type | TSSOP (24 pins) | ||
| Package Size | 7.8 mm x 6.4 mm |
Key Features
- Latch-up performance exceeds 100 mA per JESD 78, Class II.
- ESD protection exceeds JESD 22: 8000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- Fully configurable dual-rail design allows each port to operate over the full 1.2-V to 3.6-V power-supply range.
- I/Os are 4.6-V tolerant.
- VCC isolation feature – if either VCC input is at GND, all I/O ports are in the high-impedance state.
- Ioff supports partial power-down mode operation.
- Control inputs (DIR and OE) are supplied by VCCA.
- Output-enable (OE) input can be used to disable the outputs, placing the buses in a high-impedance state.
Applications
- Personal electronic devices.
- Industrial applications.
- Enterprise systems.
- Telecom equipment.
Q & A
- What is the primary function of the SN74AVC8T245PWR?
The SN74AVC8T245PWR is an 8-bit, noninverting, dual-supply bus transceiver designed for asynchronous communication between data buses and bidirectional voltage-level translation.
- What is the voltage range for the supply voltages VCCA and VCCB?
The supply voltages VCCA and VCCB can range from 1.2 V to 3.6 V).
- What are the maximum data rates for the SN74AVC8T245PWR?
The maximum data rates are 170 Mbps when VCCA or VCCB is less than 1.8 V, and 320 Mbps when both VCCA and VCCB are 1.8 V or greater).
- What is the purpose of the direction-control (DIR) input?
The DIR input determines the direction of data transmission between the A and B buses. A high on DIR allows data transmission from A to B, and a low on DIR allows data transmission from B to A).
- How does the output-enable (OE) input function?
The OE input can be used to disable the outputs, placing the buses in a high-impedance state when set to high).
- What is the VCC isolation feature?
The VCC isolation feature ensures that all I/O ports are in the high-impedance state if either VCC input is at GND).
- Is the SN74AVC8T245PWR compatible with single-supply systems?
Yes, the SN74AVC8T245PWR is compatible with single-supply systems and can be replaced later with a '245 function with minimal PCB redesign).
- What is the Ioff feature and its purpose?
The Ioff feature supports partial power-down mode operation by disabling the outputs to prevent damaging current backflow when the device is powered down).
- What are the ESD protection ratings for the SN74AVC8T245PWR?
The device has ESD protection exceeding JESD 22: 8000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model).
- What package types are available for the SN74AVC8T245PWR?
The device is available in TSSOP (24 pins), VQFN (24 pins), and TVSOP (24 pins) packages).
