The maximum clock frequency for the 74HC594DB,112 is 25 MHz, but it can be limited by the system's noise margin and the quality of the clock signal.
To ensure proper power and decoupling, use a 5V power supply with a minimum of 10uF decoupling capacitor between VCC and GND, and place the capacitor as close to the device as possible.
The maximum current that can be sourced or sunk by the 74HC594DB,112 outputs is 25mA per output, but it's recommended to limit the current to 10mA per output to ensure reliable operation.
During power-up, the asynchronous reset (SRCLR) input should be held low for at least 10ns to ensure that the device is properly reset. After power-up, the SRCLR input can be released to allow normal operation.
To minimize noise and signal integrity issues, use a solid ground plane, keep signal traces short and away from noise sources, and use a clock signal with a low skew and jitter. Also, use a series resistor (e.g., 22 ohms) on the clock input to reduce ringing and overshoot.
74HC594DB,112 datasheet
by NXP Semiconductors
