SN74LS164 Serial-in shift registers |

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Serial-in shift registers

Serial-in shift registers - SN74LS164


These 8-bit shift registers feature gated serial inputs and an asynchronous clear. The gated serial inputs (A and B) permit complete control over incoming data as a low at either input inhibits entry of the new data and resets the first flip-flop to the low level at the next clock pulse. A high-level input enables the other input which will then determine the state of the first flip-flop. Data at the serial inputs may be changed while the clock is high or low, but only information meeting the setup-time requirements will be entered. Clocking occurs on the low-to-high-level transition of the clock input. All inputs are diode-clamped to minimize transmission-line effects.

The SN54164 and SN54LS164 are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74164 and SN74LS164 are characterized for operation from 0°C to 70°C.



  • Gated Serial Inputs
  • Fully Buffered Clock and Serial Inputs
  • Asynchronous 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)
SN74LS164 Order now LS     4.75     5.25     5     35     27     32     8     -0.4     No     Catalog     0 to 70    
SN54LS164 Samples not available LS     4.75     5.25     5     35     27     32     7.8     -7.8     No     Military     -55 to 125