SN74LVTH16244/SN54LVTH16244A p

The 'LVTH16244A devices are 16-bit buffers and line drivers designed for low-voltage (3.3-V) V operation, but
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with the capability to provide a TTL interface to a 5-V system environment. These devices can be used as four
4-bit buffers, two 8-bit buffers, or one 16-bit buffer. These devices provide true outputs and symmetrical
active-low output-enable (OE) inputs.
Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown
resistors with the bus-hold circuitry is not recommended.
When V is between 0 and 1.5 V, the devices are in the high-impedance state during power up or power down.
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However, to ensure the high-impedance state above 1.5 V, OE should be tied to V through a pullup resistor;
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the minimum value of the resistor is determined by the current-sinking capability of the driver.
These devices are fully specified for hot-insertion applications using I and power-up 3-state. The I circuitry
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disables the outputs, preventing damaging current backflow through the devices when they are powered down.
The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down,
which prevents driver conflict.