The SNx4HC594 devices contain an 8-bit serial-in, parallel-out shift register that feeds
an 8-bit D-type storage register. Separate clocks and direct overriding clear
(RCLR, SRCLR) inputs are provided on both the shift
and storage registers. A serial (QH) output is provided for cascading
Both the shift register (SRCLK) and storage register (RCLK) clocks are positive edge
triggered. If both clocks are connected together, the shift register always is one count pulse
ahead of the storage register.
The parallel (QA QH) outputs have
high-current capability. QH is a standard output.
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