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74HC595 8-Bit Serial-In/Serial-Out or Parallel-Out Shift Register with 3-State Controlled Outputs
GENERAL DESCRIPTION
The 74HC595 is an 8-bit serial-in/serial-out or parallel-out shift register with 3-state outputs designed for 2.0V to 5.5V VCC operation.
The device integrates an 8-bit shift register and an 8-bit D-type storage register. The storage register features parallel 3-state outputs. The shift register provides a clear input (S��R���C��L��R�) with direct overriding function, a serial input (SER) and a serial output (QH') to implement cascading. When output enable input (O����E�) is held low, the data in storage register will appear at the outputs. When O����E� is held high, all parallel outputs are in high-impedance state.