The SN74AXC4T245 is a
four-bit noninverting bus transceiver that uses two individually configurable
power-supply rails. The device is operational with both VCCA and
VCCB supplies as low as 0.65V. The A port is designed to track
VCCA, which accepts any supply voltage from 0.65V to 3.6V. The B
port is designed to track VCCB, which also accepts any supply voltage
from 0.65V to 3.6V. Additionally the SN74AXC4T245 is compatible with
a single-supply system.
The SN74AXC4T245 device is designed for 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 of the direction-control inputs (1DIR and
2DIR). The output-enable inputs (1 OE and 2
OE) are used to disable the outputs so the buses are
effectively isolated. The SN74AXC4T245 device is designed so the
control pins (xDIR and x OE) are referenced to
VCCA.
To put the level shifter I/Os in the
high-impedance state during power up or power down, tie the xOE
pins to VCCA through a pullup resistor.
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 design of the VCC
isolation feature allows both I/O ports to enter a high-impedance state by disabling
their outputs if either VCCA or VCCB is less than 100mV.
Glitch-Free power supply sequencing
allows either supply rail to be powered on or off in any order while providing
robust power sequencing performance.
The SN74AXC4T245 is a
four-bit noninverting bus transceiver that uses two individually configurable
power-supply rails. The device is operational with both VCCA and
VCCB supplies as low as 0.65V. The A port is designed to track
VCCA, which accepts any supply voltage from 0.65V to 3.6V. The B
port is designed to track VCCB, which also accepts any supply voltage
from 0.65V to 3.6V. Additionally the SN74AXC4T245 is compatible with
a single-supply system.
The SN74AXC4T245 device is designed for 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 of the direction-control inputs (1DIR and
2DIR). The output-enable inputs (1 OE and 2
OE) are used to disable the outputs so the buses are
effectively isolated. The SN74AXC4T245 device is designed so the
control pins (xDIR and x OE) are referenced to
VCCA.
To put the level shifter I/Os in the
high-impedance state during power up or power down, tie the xOE
pins to VCCA through a pullup resistor.
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 design of the VCC
isolation feature allows both I/O ports to enter a high-impedance state by disabling
their outputs if either VCCA or VCCB is less than 100mV.
Glitch-Free power supply sequencing
allows either supply rail to be powered on or off in any order while providing
robust power sequencing performance.