CD74HCT166E

The ?HC166 and ?HCT166 8-bit shift register is fabricated
with silicon gate CMOS technology. It possesses the low
power consumption of standard CMOS integrated circuits,
and can operate at speeds comparable to the equivalent low
power Schottky device.
The ?HCT166 is functionally and pin compatible with the
standard ?LS166.
The 166 is an 8-bit shift register that has fully synchronous
serial or parallel data entry selected by an active LOW Parallel
Enable (PE) input. When the PE is LOW one setup time before
the LOW-to-HIGH clock transition, parallel data is entered into
the register. When PE is HIGH, data is entered into the internal
bit position Q0 from Serial Data Input (DS), and the remaining
bits are shifted one place to the right (Q0 ? Q1 ? Q2, etc.)
with each positive-going clock transition. For expansion of the
register in parallel to serial converters, the Q7 output is connected to the DS input of the succeeding stage