TECHNICAL DATA IN74LS164 8-Bit Serial-Input/Parallel-Output Shift Register This 8-bit shift register features gated serial inputs and an asynchronous reset.
The gated serial inputs (A and B) permit complete control over incoming data as a low at either (or both) input(s) inhibits entry of the new data and resets the first flip flop to the low level at the next clock pulse.
A high level input enables the other input which will then determine the state of the first flip-flop.
Data at the serial inputs may be changed while the clock is high or low, but only information meeting the setup requirements will be entered clocking occurs or the low-to-high level transition of the clock input.
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