SCLS382O September 1997 – September 2014 SN74LV245A
UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.
Refer to the PDF data sheet for device specific package drawings
The SNx4LV245A devices are 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 at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses are effectively isolated.
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.
These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down.
INPUTS | OPERATION | |
---|---|---|
OE | DIR | |
L | L | B data to A bus |
L | H | A data to B bus |
H | X | Isolation |