1 Features
• Control inputs VIH/VIL levels are referenced to
VCCA voltage
• VCC isolation feature – if either VCC input is at
GND, all are in the high-impedance state
• Fully configurable dual-rail design allows each port
to operate over the full 1.65-V to 5.5-V powersupply
range
• Latch-up performance exceeds 100 mA per JESD
78, class II
• ESD protection exceeds JESD 22
– 4000-V Human-Body Model (A114-A)
– 100-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)

2 Applications
• Personal electronic
• Industrial
• Enterprise
• Telecom

3 Description
The SN74LVC8T245-Q1 is an eight bit non-inverting
bus transceiver with configurable dual power
supply rails that enables bidirectional voltage level
translation. The SN74LVC8T245-Q1 is optimized to
operate with VCCA and VCCB set at 1.65 V to 5.5 V.
The A port is designed to track VCCA. VCCA accepts
any supply voltage from 1.65 V to 5.5 V. The B port
is designed to track VCCB. VCCB accepts any supply
voltage from 1.65 V to 5.5 V. This allows for universal
low-voltage bidirectional translation between any of
the 1.8-V, 2.5-V, 3.3-V, and 5.5-V voltage nodes.
The SN74LVC8T245-Q1 is designed for
asynchronous communication between two data
buses. The logic levels of the direction-control (DIR)
input and the output-enable (OE) input activate either
the B-port outputs or the A-port outputs or place
both output ports into the high-impedance mode. 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
is always active and must have a logic HIGH or LOW
level applied to prevent excess ICC and ICCZ.
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 ensures that if either VCC input is
at GND, all outputs are in the high-impedance state.
To ensure the high-impedance state during power up
or power down, OE should be tied to VCC through
a pullup resistor; the minimum value of the resistor
is determined by the current-sinking capability of the
driver.
The SN74LVC8T245-Q1 is designed so that the
control pins (DIR and OE) are supplied by VCCA.