Description
The M54/74HC164 is a high speed CMOS 8 BIT SIPO SHIFT REGISTER fabricated in silicon gate C2MOS technology. It has the same highspeed performance of LSTTL combined with true CMOS low power consumption. The HC164 is an 8 bit shift register with serial data entry and an output from each of the eight stages. Data is entered serially through one of two inputs (A or B), either of these inputs can beused asan active high enable for data entry through the other input. An unused input must be high, or both inputs connected together. Each low-to-high transition on the clock input shifts data one place to the right and entersintoQA, thelogic NAND of the twodata inputs (A ⋅B), the data that existed before the rising clock edge. A low level on the clear input overrides all other inputs and clearsthe register asynchronously, forcing all Q outputs low. All inputs are equipped with protection circuits against static discharge and transient excess voltage. 1/12