Overview
The SN74AVCH8T245 is an 8-bit dual-supply bus transceiver produced by Texas Instruments. This device is designed for bidirectional data transmission between two different voltage domains, making it highly versatile in various electronic systems. It supports a wide range of supply voltages from 1.2V to 3.6V for both the A and B ports, allowing for universal low-voltage bidirectional translation. The device is optimized for asynchronous communication between data buses and is compatible with single-supply systems, enabling easy integration and minimal redesign of printed circuit boards.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VCCA (A-port supply voltage) | 1.2 to 3.6 | V |
| VCCB (B-port supply voltage) | 1.2 to 3.6 | V |
| Input Voltage (I/O ports) | -0.5 to 4.6 | V |
| Operating Temperature Range | -40 to 85 | °C |
| Propagation Delay Time (tPLH, tPHL) | 0.5 to 6.8 | ns |
| Maximum Data Rates | 170 Mbps (VCCA < 1.8V or VCCB < 1.8V), 320 Mbps (VCCA ≥ 1.8V and VCCB ≥ 1.8V) | Mbps |
| Junction-to-Ambient Thermal Resistance (RθJA) | 36.8 to 116.7 | °C/W |
Key Features
- Control inputs (DIR and OE) VIH and VIL levels are referenced to VCCA voltage.
- Bus hold on data inputs eliminates the need for pullup or pulldown resistors.
- VCC isolation feature allows the outputs to be in the high-impedance state when either VCCA or VCCB is at GND.
- Ioff supports partial power-down mode operation, preventing damaging current backflow through the device.
- 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.
- ESD protection exceeds JESD 22 standards: 8000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- Latch-up performance exceeds 100 mA per JESD 78, Class II.
Applications
The SN74AVCH8T245 is suitable for various applications requiring bidirectional data transmission between different voltage domains. This includes:
- Asynchronous communication between data buses in mixed-voltage systems.
- Universal low-voltage bidirectional translation between 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V voltage nodes.
- Partial power-down mode operations, where the device can be powered down without causing current backflow.
- Systems requiring high ESD protection and latch-up performance.
Q & A
- What is the voltage range for the A and B ports of the SN74AVCH8T245?
The A and B ports can operate with supply voltages ranging from 1.2V to 3.6V.
- What is the maximum data rate supported by the SN74AVCH8T245?
The device supports maximum data rates of 170 Mbps (for VCCA < 1.8V or VCCB < 1.8V) and 320 Mbps (for VCCA ≥ 1.8V and VCCB ≥ 1.8V).
- How does the VCC isolation feature work?
The VCC isolation feature allows the outputs to be in the high-impedance state when either VCCA or VCCB is at GND.
- What is the purpose of the Ioff circuitry?
The Ioff circuitry disables the outputs during partial power-down mode, preventing damaging current backflow through the device.
- What kind of ESD protection does the SN74AVCH8T245 offer?
The device offers ESD protection exceeding JESD 22 standards: 8000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- How is the latch-up performance of the SN74AVCH8T245?
The latch-up performance exceeds 100 mA per JESD 78, Class II.
- What is the operating temperature range of the SN74AVCH8T245?
The operating temperature range is from -40°C to 85°C.
- What are the package options available for the SN74AVCH8T245?
The device is available in TVSOP (DGV), TSSOP (PW), and VQFN (RHL) packages.
- How does the bus hold feature work on the SN74AVCH8T245?
The bus hold feature on the data inputs eliminates the need for pullup or pulldown resistors.
- Can the SN74AVCH8T245 be used in single-supply systems?
