The SN74HCS574 contains eight D-type flip-flops. All inputs include Schmitt-trigger architecture. All channels share a clock (CLK) and output enable (OE) input.

Data is stored in the flip-flop on the rising edge of the clock.

The output state of all channels is unknown at startup until valid data is clocked into the flip-flops.

When the outputs are enabled (OE is low), the outputs are actively driving low or high.

When the outputs are disabled (OE is high), the outputs are set into the high-impedance state.

The active low output enable (OE) does not have any impact on the stored state in the flip-flops.