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CD74HCT4094: How to use CD74HCT4094?

Part Number: CD74HCT4094


Dear All,

The section 7.1 Overview, is described as follows:

"... The same serial information, available at the QS2 terminal on the next negative clock edge, provides a means for cascading these devices when the clock rise time is slow."

However, the function block is drawn as follows:

Which one is correct, and how can I interpret this function correctly?

Thank a lot

Cody