SN74AXCH8T245PWR

The SN74AXCH8T245 device is an 8-bit in-phase bus transceiver that can be used to solve the voltage level mismatch problem between devices operating at the latest voltage nodes (0.7V, 0.8V, 0.9V) and those operating at industry-standard voltage nodes (1.8V, 2.5V, 3.3V). This device features two independent power supply rails (VCCA and VCCB). Data pins A1 to A8 are all used to track VCCA and can withstand any power supply voltage in the range of 0.65V - 3.6V. Data pins B1 to B8 are all used to track VCCB and can withstand any power supply voltage in the range of 0.65V - 3.6V. In addition, the SN74AXCH8T245 is also compatible with single-power-supply systems. The SN74AXCH8T245 device is designed to enable asynchronous communication between data buses. Based on the logic levels of the direction control inputs (DIR1 and DIR2), this device transfers data from bus A to bus B or from bus B to bus A. The output enable (OE) input can be used to disable the output, effectively isolating the bus. The SN74AXCH8T245 device is designed to reference the control pins (DIR and OE) to VCCA. The active bus-hold circuit keeps unused or undriven inputs in a valid logic state. It is not recommended to use pull-up or pull-down resistors on the bus-hold circuit. If VCCA or VCCB is connected to the power supply, the bus-hold circuit always remains operational on all A and B ports, regardless of the direction control or output enable. This device is fully suitable for partial power-down applications using Ioff. When the device is powered down, the Ioff circuit disables the output. This suppresses current backflow into the device, preventing damage to the device. The VCC isolation feature ensures that when either VCC input power supply is below 100mV, all level-shifter outputs are disabled and in a high-impedance state. To ensure that the level-shifter I/O is in a high-impedance state during power-up or power-down, OE should be connected to VCCA through a pull-up resistor; the minimum value of this resistor depends on the sink current capability of the driver.

Applications

• Enterprise & Communications Wireless Infrastructure
• Building Automation
• Data Center Switches
• Enterprise SSD Rack Servers
• Electronic Point of Sale (EPOS)

Key features

• Certified, fully configurable dual supply rail design allows each port to operate over a supply voltage range of 0.65V to 3.6V
• Operating temperature range: -40°C to +125°C
• Bus-hold data inputs eliminate the need for external pull-up or pull-down resistors
• Multi-directional control pin supporting synchronous direction switching
• Translation rates up to 380Mbps when converting from 1.8V to 3.3V
• VCC isolation feature effectively isolates both buses during power-down conditions
• Partial power-down mode limits backflow current during power-down conditions
• Compatible with SN74AVCH8T245 and 74AVCH8T245 level translators
• Latch-up performance exceeds 100mA per JESD 78 Class II specifications
• ESD protection performance exceeds JESD 22 specifications
• 8000V Human Body Model, 1000V Charged Device Model