The SN74AXC1T45 is
a single-bit noninverting bus transceiver that uses two separate configurable power-supply rails.
The device is operational with both VCCA and VCCB
supplies as low as 0.65 V. The A port is designed to track VCCA, which
accepts any supply voltage from 0.65 V to 3.6 V. The B port is designed to track
VCCB, which also accepts any supply voltage from 0.65 V to 3.6 V.
The DIR pin determines the direction of signal propagation. With the DIR pin configured
HIGH, translation is from Port A to Port B. With DIR configured LOW, translation is from Port B to
Port A. The DIR pin is referenced to VCCA, meaning that its logic-high and
logic-low thresholds track with VCCA.
This device is fully specified for partial-power-down applications using the
Ioff current. The Ioff protection circuitry ensures
that no excessive current is drawn from or to an input, output, or combined I/O that is biased to a
specific voltage while the device is powered down.
The VCC isolation feature ensures that if either
VCCA or VCCB is less than 100 mV, both I/O ports
enter a high-impedance state by disabling their outputs.
Glitch-free supply sequencing permits either supply rail to be powered on or off, in any
order, without producing a data glitch (that is an output waveform that momentarily transitions
from Logic Low to Logic High).
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