SCLS116C - DECEMBER 1982 - REVISED MAY 1997
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The 'HC165 are 8-bit parallel-load shift registers that, when clocked, shift the data toward a serial (QH) output. Parallel-in access to each stage is provided by eight individual direct data (A-H) inputs that are enabled by a low level at the shift/load (SH/LD\) input. The 'HC165 also feature a clock-inhibit (CLK INH) function and a complementary serial (Q\H) output.
Clocking is accomplished by a low-to-high transition of the clock (CLK) input while SH/LD\ is held high and CLK INH is held low. The functions of CLK and CLK INH are interchangeable. Since a low CLK and a low-to-high transition of CLK INH also accomplish clocking, CLK INH should be changed to the high level only while CLK is high. Parallel loading is inhibited when SH/LD\ is held high. While SH/LD\ is low, the parallel inputs to the register are enabled independently of the levels of the CLK, CLK INH, or serial (SER) inputs.
The SN54HC165 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74HC165 is characterized for operation from -40°C to 85°C.
View more information about generic part numbers:SN54HC165, SN74HC165
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