MC74HC165AFELG ON Semiconductor

MC74HC165A 8-Bit Serial or Parallel-Input/ Serial-Output Shift Register HighPerformance SiliconGate CMOS MC74HC165A SERIAL SHIFT/ SERIAL SHIFT/ PARALLEL LOAD V CC 1 16 V CC PARALLEL LOAD 116 CLOCK 2 15 CLOCK INHIBIT CLOCK215 CLOCK INHIBIT E 3 14 D E314 D F 4 13 C 413 F C GND G 5 12 B G512 B H 6 11 A H611 A Q 7 10 S H A Q710 S H A 89 GND 8 9 Q H GND Q H Figure 1. Pin Assignments 11 A 12 B 9 13 Q H SERIAL C PARALLEL 14 DATA D 7 DATA OUTPUTS Q 3 H E INPUTS 4 F 5 G 6 H PIN 16 = V SERIAL CC 10 PIN 8 = GND S DATA A INPUT 1 SERIAL SHIFT/ PARALLEL LOAD 2 CLOCK 15 CLOCK INHIBIT Figure 2. Logic Diagram FUNCTION TABLE Inputs Internal Stages Output Serial Shift/ Clock Parallel Load Inhibit Clock S A H Q Q Q A A B H Operation L X X X a h a b h Asynchronous Parallel Load H L L X L Q Q An Gn Serial Shift via Clock H L H X H Q Q An Gn H L L X L Q Q An Gn Serial Shift via Clock Inhibit H L H X H Q Q An Gn H X H X X No Change Inhibited Clock H H X X X H L L X X No Change No Clock X = dont care Q Q = Data shifted from the preceding stage An Gn