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SN74HC595: 74HC595 Serial to parallel converter

Part Number: SN74HC595

Hi Team,

Can you please help with the below query for SN74HC595

When the  RCLK and SRCLK are low, OE# is low. SRCLR# is low. What is the status of Qx outputs?


Default the Qx outputs are pulled low.


  • SRCLR clears the input shift register, but not the output register. So the status of the outputs is undefined.

    The outputs become low only after an edge on RCLK.

    If the outputs show be high impedance until they are initialized, OE must be held high until the initialization is complete.