CD74HCT165 High Speed CMOS Logic 8-Bit Parallel-In/Serial-Out Shift Register |

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High Speed CMOS Logic 8-Bit Parallel-In/Serial-Out Shift Register

High Speed CMOS Logic 8-Bit Parallel-In/Serial-Out Shift Register - CD74HCT165


The ’HC165 and ’HCT165 are 8-bit parallel or serial-in shift registers with complementary serial outputs (Q7 and Q\7) available from the last stage. When the parallel load (PL\) input is LOW, parallel data from the D0 to D7 inputs are loaded into the register asynchronously. When the PL\ is HIGH, data enters the register serially at the DS input and shifts one place to the right (Q0 → Q1 → Q2, etc.) with each positive-going clock transition. This feature allow parallel-to-serial converter expansion by typing the Q7 output to the DS input of the succeeding device.

For predictable operation the LOW-to-HIGH transition of CE\ should only take place while CP is HIGH. Also, CP and CE\ should be LOW before the LOW-to-HIGH transition of PL to prevent shifting the data when PL\ goes HIGH.


  • Buffered Inputs
  • Asynchronous Parallel Load
  • Complementary Outputs
  • Fanout (Over Temperature Range)
    • Standard Outputs. . . . . . 10 LSTTL Loads
    • Bus Driver Outputs . . . . . . 15 LSTTL Loads
  • Wide Operating Temperature Range . . . -55°C to 125°C
  • Balanced Propagation Delay and Transition Times
  • Significant Power Reduction Compared to LSTTL Logic ICs
  • HC Types
    • 2V to 6V Operation
    • High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V
  • HCT Types
    • 4.5V to 5.5V Operation
    • Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
    • CMOS Input Compatibility, Il 1µA at VOL, VOH


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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)
CD74HCT165 Order now HCT     4.5     5.5     5     25     0.08     50     4     -4     No     Catalog     -55 to 125    
CD54HCT165 Samples not available HCT     4.5     5.5     4.5     25     0.08     50     4     -4     No     Military     -55 to 125