The maximum frequency of operation for the 74HC374D,652 is 100 MHz, but it can vary depending on the output load and supply voltage.
To ensure that the outputs are not corrupted during power-up or power-down, it is recommended to use an external pull-up or pull-down resistor on the output pins, and to use a power-on reset circuit to initialize the device.
The maximum current that can be sourced or sunk by the output pins of the 74HC374D,652 is 25 mA, but it is recommended to limit the current to 10 mA or less to ensure reliable operation.
Yes, the 74HC374D,652 can be used in a 5V system, but it is recommended to use a voltage regulator to ensure that the supply voltage is within the recommended range of 2V to 6V.
To handle thermal dissipation, it is recommended to use a heat sink or a thermal pad on the device, and to ensure that the device is mounted on a PCB with good thermal conductivity.