The SN74HC595B devices contain an 8-bit, serial-in, parallel-out shift register that
feeds an 8-bit D-type storage register. The storage register has parallel 3-state outputs. Separate
clocks are provided for both the shift register and storage register. The shift register has a
direct overriding clear (SRCLR) input, serial (SER) input, and serial
outputs for cascading. When the output-enable (OE) input is high, the all
outputs are in the high-impedance state except QH.
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