The SN74HC595DWR is a 8-bit Shift Register with 3-state output registers. It contains an 8-bit, serial-in, parallel-out shift register that feeds an 8-bit D-type storage register. The storage register has parallel 3-state outputs. Separate clocks are provided for both the shift and storage register. The shift register has a direct overriding clear (SRCLR\\) input, serial (SER) input and serial outputs for cascading. When the OE\ input is high, the outputs are in the high-impedance state.
High-current 3-state outputs can drive up to 15 LSTTL loads