The maximum clock frequency for the SN74HC595 is 100 MHz, but it can vary depending on the operating voltage and load capacitance. It's recommended to check the timing diagrams in the datasheet for specific frequency limits.
To ensure that the output pins are in a high-impedance state during power-up, you can use an external pull-up resistor on the OE (output enable) pin. This will keep the outputs in a high-impedance state until the OE pin is actively driven low.
Yes, the SN74HC595 can be used as a level shifter, but it's not recommended. The device is designed to operate within a specific voltage range (2V to 6V), and using it as a level shifter may compromise its performance and reliability. Instead, consider using a dedicated level shifter IC.
The asynchronous reset (SRCLR) input should be tied to VCC through a pull-up resistor to prevent accidental resets. When SRCLR is driven low, the shift register is reset, and all outputs are set to a low state.
The maximum output current for each pin is 25 mA, but it's recommended to limit the output current to 10 mA or less to ensure reliable operation and prevent overheating.
SN74HC595DBRE4 datasheet
by Texas Instruments
