SN74ALS165

The ALS165 are parallel-load 8-bit serial shiftregisters that, when clocked, shift the data towardserial (Q_Hand Q_H ) outputs. Parallel-in access toeach stage is provided by eight individual directdata (AH) inputs that are enabled by a low levelat the shift/load (SH/LD) input. The ALS165 havea clock-inhibit function and complemented serialoutputs.

Clocking is accomplished by a low-to-hightransition of the clock (CLK) input while SH/LD isheld high and the clockinhibit (CLK INH) input isheld low. The functions of CLK and CLK INH areinterchangeable. Since a low CLK and alow-to-high transition of CLK INH alsoaccomplishes clocking, CLK INH should bechanged to the high level only while CLK is high.Parallel loading is inhibited when SH/LD is heldhigh. The parallel inputs to the register areenabled while SH/LD is low independently of thelevels of the CLK, CLK INH, or serial (SER) inputs. In the ALS165  series, the SN54ALS165 is characterized for operation over the full military temperature range of 55 to 125. The SN74ALS165 is characterized for operation from 0 to 70