The SN74AVC8T245-Q1 is an 8-bit noninverting bus transceiver that uses two separate
configurable power-supply rails. The SN74AVC8T245-Q1 operation is optimimal with
VCCA and VCCB set at
1.4 V to 3.6 V. It is operational with VCCA and
VCCB as low as 1.2 V. The A port is designed to track
VCCA. VCCA accepts any supply voltage from 1.2 V to
3.6 V. The B port is designed to track VCCB. VCCB
accepts any supply voltage from 1.2 V to 3.6 V. This allows for universal low-voltage bidirectional
translation between any of the 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V voltage nodes.
The SN74AVC8T245 design enables asynchronous communication between data buses. 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 at the direction-control (DIR) input. One can use the output-enable
(OE) input to disable the outputs so the buses are effectively
In the SN74AVC8T245 design, VCCA supplies the control pins (DIR
This device specification covers partial-power-down applications using
Ioff. The Ioff circuitry disables the outputs when
the device is powered down. This inhibits current backflow into the device which prevents damage to
The VCC isolation feature ensures that if either
VCC input is at GND, both ports are in the high-impedance state.
To ensure the high-impedance state during power up or power down, tie
OE to VCC through a pullup resistor; the
current-sinking capability of the driver determines the minimum value of the resistor.
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