M74HC590B1R datasheet by STMicroelectronics

M74HC590B1R Frequently Asked Questions (FAQs)

• What is the maximum clock frequency for the M74HC590B1R?
  The maximum clock frequency for the M74HC590B1R is 100 MHz, but it can operate up to 150 MHz with a reduced voltage supply (VCC) of 4.5V.
• How do I handle the asynchronous reset (RST) input?
  The asynchronous reset (RST) input should be asserted low (GND) for at least 2 clock cycles to ensure a proper reset. It's recommended to use a pull-up resistor to VCC to prevent unwanted resets.
• What is the recommended power-on reset (POR) circuit for the M74HC590B1R?
  A simple POR circuit can be implemented using a resistor, capacitor, and diode. The capacitor should be charged to VCC through the resistor, and the diode should be connected in parallel to the capacitor to discharge it quickly when power is turned off.
• How do I ensure reliable data transfer between the M74HC590B1R and other devices?
  To ensure reliable data transfer, use a clock signal with a rise and fall time of less than 10 ns, and ensure that the data is stable for at least 2 ns before and after the clock edge. Additionally, use a pull-up resistor on the data lines to prevent floating inputs.
• What is the maximum capacitance allowed on the clock input (CLK) pin?
  The maximum capacitance allowed on the clock input (CLK) pin is 100 pF. Exceeding this value may cause clock signal degradation and affect the device's performance.