Overview
The SN74AXC8T245PWR is an 8-bit non-inverting bus transceiver designed by Texas Instruments. This device is part of the AXC family, optimized for low-voltage operation and compatible with modern low-voltage and mixed-voltage systems. It resolves voltage level mismatches between devices operating at different voltage nodes, such as 0.7V, 0.8V, 0.9V, and industry standard voltage nodes like 1.8V, 2.5V, and 3.3V. The device operates using two independent power-supply rails (VCCA and VCCB), each capable of accepting supply voltages from 0.65V to 3.6V.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | TSSOP-24 |
| Number of Bits | 8 |
| Number of Ports | 2 |
| Supply Voltage Range (V) | 0.65V to 3.6V |
| Operating Temperature Range (°C) | -40 to 125 |
| Propagation Delay (ns) | 172 |
| Supply Current (mA) | 0.055 (max) |
| Output Low Current (mA) | 12 (max) |
| ESD Protection | 8000-V human-body model, 1000-V charged-device model |
| Latch-Up Performance | Exceeds 100mA per JESD 78, class II |
Key Features
- Qualified fully configurable dual-rail design allowing each port to operate with a power supply range from 0.65V to 3.6V.
- Operating temperature range from -40°C to +125°C.
- Multiple direction-control pins for simultaneous up and down translation.
- Up to 380Mbps support when translating from 1.8V to 3.3V.
- VCC isolation feature to effectively isolate both buses in a power-down scenario.
- Partial power-down mode to limit backflow current in a power-down scenario.
- Compatible with SN74AVC8T245 and 74AVC8T245 level shifters.
- Bus-hold on data inputs eliminates the need for external pullup or pulldown resistors.
- ESD protection exceeds JESD 22 standards.
Applications
- Enterprise and Communications systems
- Wireless Infrastructure
- Building Automation
- Data Center Switches
- Enterprise Solid State Drives
- Rack Servers
- EPOS (Electronic Point of Sale) systems
Q & A
- What is the SN74AXC8T245PWR used for?
The SN74AXC8T245PWR is used as an 8-bit non-inverting bus transceiver to resolve voltage level mismatches between devices operating at different voltage nodes.
- What is the operating temperature range of the SN74AXC8T245PWR?
The operating temperature range is from -40°C to +125°C.
- What are the supply voltage ranges for VCCA and VCCB?
Both VCCA and VCCB can accept supply voltages from 0.65V to 3.6V.
- How does the direction control work on the SN74AXC8T245PWR?
The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level of the direction-control inputs (DIR1 and DIR2).
- What is the purpose of the output-enable (OE) input?
The output-enable (OE) input is used to disable the outputs, placing the buses in a high-impedance state.
- Does the SN74AXC8T245PWR have ESD protection?
- What is the propagation delay of the SN74AXC8T245PWR?
The propagation delay is 172 ns.
- Is the SN74AXC8T245PWR compatible with other level shifters?
- What is the VCC isolation feature?
The VCC isolation feature disables all level shifter outputs and places them in a high-impedance state if either VCC input supply is below 100mV.
- What is the purpose of the bus-hold circuitry?
The bus-hold circuitry holds unused or undriven inputs at a valid logic state, eliminating the need for external pullup or pulldown resistors.
