High Speed CMOS Logic 8-Bit Parallel-In/Serial-Out Shift Register - CD54HC165


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



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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Parametrics Compare all products in Flip-Flop/Latch/Registers

Technology Family
VCC (Min) (V)
VCC (Max) (V)
Bits (#)
F @ Nom Voltage (Max) (Mhz)
ICC @ Nom Voltage (Max) (mA)
tpd @ Nom Voltage (Max) (ns)
Input Type
3-State Output
Output Drive (IOL/IOH) (Max) (mA)
Output Type
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
CD54HC165 CD74HC165
HC    HC   
2    2   
6    6   
8    8   
28    28   
0.08    0.08   
32    32   
No    No   
5.2/-5.2    5.2/-5.2   
Military    Catalog   
-55 to 125    -55 to 125   
See datasheet (CDIP)    See datasheet (PDIP)
16SOIC: 59 mm2: 6 x 9.9(SOIC)   

Other qualified versions of CD54HC165

Version Part Number Definition
Catalog CD74HC165 TI's standard catalog product