SN74AXCH1T45DBVR

The SN74AXCH1T45 is a single-bit in-phase bus transceiver with two independently configurable power supply rails. The device can operate normally when the supply voltages of VCCA and VCCB are as low as 0.65V. Port A is used to track VCCA and can support any supply voltage in the range of 0.65V to 3.6V. Port B is used to track VCCB and can also support any supply voltage in the range of 0.65V to 3.6V. In addition, the SN74AXCH1T45 is also compatible with single-supply systems. The DIR pin determines the direction of signal propagation. When the DIR pin is configured to a high level, the signal is converted from port A to port B. When DIR is configured to a low level, the signal flows from port B to port A. The DIR pin is referenced to VCCA, which means its logic high and logic low thresholds track the VCCA voltage. 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 powered, the bus-hold circuit always remains active on port A or port B, respectively, regardless of the state of the direction control pin. This device fully meets the specifications for partial-power-down applications using Ioff current. When the device is powered down, the Ioff protection circuit ensures that no excess current is drawn from or supplied to the inputs, outputs, or combined I/Os biased to a specific voltage. The VCC isolation feature ensures that when VCCA or VCCB is below 100mV, the outputs of the I/O ports are disabled and enter a high-impedance state. The glitch-free power sequencing allows the power supply rails to be turned on or off in any order, providing robust power sequencing performance.

Applications

• Consumer Electronics
• Enterprise & Communications
• Wireless Infrastructure
• Building Automation
• Electronic Point of Sale
• Enterprise SSD

Key features

• Fully configurable dual supply rail design allows each port to operate across a supply voltage range of 0.65V to 3.6V
• Operating temperature: -40℃ to +125℃
• Glitch-free power sequencing
• Bus-hold data inputs eliminate the need for external pull-up or pull-down resistors
• Maximum quiescent current (ICC A + ICC B): 10μA (up to 85℃) and 16μA (up to 125℃)
• Supports translation speeds up to 500Mbps when translating from 1.8V to 3.3V
• VCC isolation feature – if either VCC input falls below 100mV, all I/O outputs are disabled and placed in a high-impedance state
• Ioff supports partial power-down mode operation
• Latch-up performance exceeds 100mA per JESD 78 Class II specifications
• ESD protection exceeds JESD 22 specifications – 8000V Human Body Model, 1000V Charged Device Model