MM74HC165

The MM74HC165 high speed PARALLEL-IN/SERIAL-OUTSHIFT REGISTER utilizes advanced silicon-gate CMOS technology. It has the low power consumption and highnoise immunity of standard CMOS integrated circuits,along with the ability to drive 10 LS-TTL loads.
This 8-bit serial shift register of MM74HC165 shifts data from Q_A to Q_Hwhen clocked. Parallel inputs to each stage are enabled bya low level at the SHIFT/LOAD input. Also included is agated CLOCK input and a complementary output from theeighth bit.
Clocking is accomplished through a 2-input NOR gate permittingone input to be used as a CLOCK INHIBIT function.Holding either of the CLOCK of MM74HC165 inputs high inhibits clocking,and holding either CLOCK input low with the SHIFT/LOADinput high enables the other CLOCK input. Data transferoccurs on the positive going edge of the clock. Parallelloading is inhibited as long as the SHIFT/LOAD input isHIGH. When taken LOW, data at the parallel inputs isloaded directly into the register independent of the state ofthe clock.
The MM74HC165 is functionally as well as pin-outcompatible with the standard 74LS logic family. All inputsare protected from damage due to static discharge by internaldiode clamps to V_CC and ground.