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IC 74595

8-bit serial-in/serial or parallel-out shift register
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8-Bit Serial-In, Parallel-Out Shift
Wide Operating Voltage Range of 2 V to 6 V
High-Current 3-State Outputs Can Drive Up To 15 LSTTL Loads
Low Power Consumption, 80-uA Max ICC
Typical tpd = 13 ns
±6-mA Output Drive at 5 V
Low Input Current of 1 uA Max
Shift Register Has Direct Clear
The ’HC595 devices contain 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 output-enable (OE) input is high, the outputs are in the high-impedance state. Both the shift register clock (SRCLK) and storage register clock (RCLK) are positive-edge triggered. If both clocks are connected together, the shift register always is one clock pulse ahead of the storage register.
https://www.sparkfun.com/datasheets/IC/SN74HC595.pdf
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