74HC594 pdf datasheet

MM74HC594 8-Bit Shift Registerwith Output RegistersGeneral DescripTIonThis high speed shift register uTIlizes advanced silicon-gateCMOS technology. This device possesses the high noiseimmunity and low power consumpTIon of standard CMOSintegrated circuits, as well as the ability to drive 15 LS-TTLloads.This device contains an 8-bit serial-in, parallel-out shift registerthat feeds an 8-bit D-type storage register. Separateclocks and direct overriding clears are provided for both theshift register and the storage register. The shift register hasa direct-overriding clear, serial input, and serial output (standard)pins for cascading. Both the shift register and storageregister use posiTIve-edge triggered clocks. If both clocksare connected together, the shift register state will alwaysbe one clock pulse ahead of the storage register.The 54HC/74HC logic family is speed, function, and pin-outcompatible with the standard 54LS/74LS logic family. Allinputs are protected from damage due to static discharge byinternal diode clamps to VCC and ground.FeaturesY Low quiescent current: 80 mA maximum (74HC Series)Y Low input current: 1 mA maximumY 8-bit serial-in, parallel-out shift registerwith storageY Wide operating voltage range: 2V±6VY CascadableY Shift register has direct clearY Guaranteed shift frequency: DC to 30 MHz