This octal bus transceiver is designed for asynchronous two-way communication between data buses. The control-function implementation minimizes external timing requirements.
The SN74LV245AT allows data transmission 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 that 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.
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.
Inputs Are TTL-Voltage Compatible
4.5-V to 5.5-V VCC Operation
Typical tpd of 3.5 ns at 5 V
Typical VOLP (Output Ground Bounce) <0.8 V at VCC = 5 V, TA = 25°C
Typical VOHV (Output VOH Undershoot) >2.3 V at VCC = 5 V, TA = 25°C
Supports Mixed-Mode Voltage Operation on All Ports