DESCRIPTION:
Maxwell Technologies’ 54LVTH245A 8-bit octal transceiver micro-circuit features a greater than 100 krad (Si) total dose tolerance, depending upon space mission. The 54LVTH245A is designed specifically for low voltage (3.3V) VCC operation, but with the capability to provide a TTL interface to a 5V system environment. It 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 upon 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. The 54LVTH245A active bus-hold circuitry is provided to prevent floating data inputs at a valid logic level and to eliminate the need for external pullup resistors.

FEATURES:
• 3.3V ABT octal bus transceiver with 3-state outputs
• RAD-PAK® radiation hardened against natural space radiation
• Total dose hardness:
    - >100 krad (Si), depending upon space misssion
• Package:
    - 20 pin RAD-PAK® flat package
    - 20 pin RAD-PAK® DIP
• Operating temperature range: -55 to 125°C
• Supports mixed-mode signal operation
    - 5V input and output voltages with 3.3V VCC
• Supports unregulated battery operation down to 2.7V.
• Typical VOLP (output ground bounce) < 0.8V at VCC=3.3V, TA = 25°C
• Latch-up performance exceeds 500mA per JEDEC standard
• Supports live insertion
• Bus-hold data inputs eliminate the need for external pullup resistors