1 Features
• AEC-Q100 qualified for automotive applications
• Fully configurable dual-rail design allows each port
to operate over the full 1.65V to 5.5V power-supply
range
• VCC isolation feature – if either VCC input is at
GND, both ports are in the high-impedance state
• DIR input circuit referenced to VCCA
• Low power consumption, 10μA maximum ICC
• ±24mA output drive at 3.3V
• Ioff supports Partial-Power-Down mode operation
• Maximum data rates:
– 420Mbps (3.3V to 5V translation)
– 210Mbps (translate to 3.3V)
– 140Mbps (translate to 2.5V)
– 75Mbps (translate to 1.8V)

2 Applications
• Personal electronic
• Industrial
• Enterprise
• Telecom

3 Description
This dual-bit noninverting bus transceiver uses two
separate configurable power-supply rails. The A port
is designed to track VCCA. VCCA accepts any supply
voltage from 1.65V to 5.5V. The B port is designed
to track VCCB. VCCB accepts any supply voltage from
1.65V to 5.5V. This allows for universal low-voltage
bidirectional translation between any of the 1.8V, 2.5V,
3.3V, and 5V voltage nodes.
The SN74LVC2T45-Q1 is designed for asynchronous
communication between two data buses. The logic
levels of the direction-control (DIR) input activate
either the B-port outputs or the A-port outputs. The
device transmits data from the A bus to the B bus
when the B-port outputs are activated, and from the
B bus to the A bus when the A-port outputs are
activated. The input circuitry on both A and B ports
are always active and must have a logic HIGH or
LOW level applied to prevent excess ICC and ICCZ.
The SN74LVC2T45-Q1 is designed so that VCCA
supplies the DIR input circuit. This device is fully
specified for partial-power-down applications using
Ioff. The Ioff circuitry disables the outputs, preventing
damaging current backflow through the device when it
is powered down.
The VCC isolation feature is designed so that if either
VCC input is at GND, both ports are in the highimpedance
state.