DESCRIPTION
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.

FEATURES
• 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
• Ioff Supports Partial-Power-Down Mode Operation
• Latch-Up Performance Exceeds 250 mA Per JESD 17
• ESD Protection Exceeds JESD 22
   – 2000-V Human-Body Model (A114-A)
   – 1000-V Charged-Device Model (C101)