CD74HC595 8-Bit Shift Registers With 3-State Output Registers |

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8-Bit Shift Registers With 3-State Output Registers

8-Bit Shift Registers With 3-State Output Registers - CD74HC595


The CD74HC595 device 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 registers. The shift register has a direct overriding clear (SRCLR)\ input, serial (SER) input, and serial output 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.


  • 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-µA Max ICC
  • Typical tpd = 14 ns
  • ±6-mA Output Drive at 5 V
  • Low Input Current of 1 µA Max
  • Shift Register Has Direct Clear


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Part number Order Technology Family VCC (Min) (V) VCC (Max) (V) Voltage (Nom) (V) F @ nom voltage (Max) (MHz) ICC @ nom voltage (Max) (mA) tpd @ nom Voltage (Max) (ns) IOL (Max) (mA) IOH (Max) (mA) 3-state output Rating Operating temperature range (C)
CD74HC595 Order now HC     2     6     6     28     0.08     41     7.8     -7.8     Yes     Catalog     -55 to 125