SN74LS594 Serial-in shift registers with output latches |

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Serial-in shift registers with output latches

Serial-in shift registers with output latches - SN74LS594


These devices each contain an 8-bit D-type sorage register. The storage register has buffered ('LS594) or open-collector ('LS599) outputs. Separate clocks and direct-overriding clears are provided on both the shift and storage registers. A shift output (QH') is provided for cascading purposes.

Both the shift register and the storage register clocks are positive-edge triggered. If the user wishes to connect both clocks together, the shift register will always be one clock pulse ahead of the storage register.


  • 8-Bit Serial-In, Parallel-Out Shift Registers with Storage
  • Choice of Output Configurations:
    'LS594 . . . Buffered
    'LS599 . . . Open-Collector
  • Guaranteed Shift Frequeny:
    DC to 20 MHz
  • Independent Direct-Overriding Clears on Shift and Storage Registers


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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)
SN74LS594 Order now LS     4.75     5.25     5     35     65     25     24     -2.6     No     Catalog     0 to 70