8-Bit Parallel-Load Shift Registers

8-Bit Parallel-Load Shift Registers - SN74HC165


The SNx4HC165 devices are 8-bit parallel-load shift registers that, when clocked, shift the data toward a serial (QH) output. Parallel-in access to each stage is provided by eight individual direct data (A–H) inputs that are enabled by a low level at the shift/load (SH/LD) input. The SNx4HC165 devices also feature a clock-inhibit (CLK INH) function and a complementary serial (QH) output.

Clocking is accomplished by a low-to-high transition of the clock (CLK) input while SH/LD is held high and CLK INH is held low. The functions of CLK and CLK INH are interchangeable. Because a low CLK and a low-to-high transition of CLK INH also accomplish clocking, CLK INH must be changed to the high level only while CLK is high. Parallel loading is inhibited when SH/LD is held high. While SH/LD is low, the parallel inputs to the register are enabled independently of the levels of the CLK, CLK INH, or serial (SER) inputs.


  • Wide Operating Voltage Range of 2 V to 6 V
  • Outputs Can Drive Up to 10 LSTTL Loads
  • Low Power Consumption, 80-µA Maximum ICC
  • Typical tpd = 13 ns
  • ±4-mA Output Drive at 5 V
  • Low Input Current of 1 µA Maximum
  • Complementary Outputs
  • Direct Overriding Load (Data) Inputs
  • Gated Clock Inputs
  • Parallel-to-Serial Data Conversion
  • On Products Compliant to MIL-PRF-38535,
    All Parameters Are Tested Unless Otherwise
    Noted. On All Other Products, Production
    Processing Does Not Necessarily Include Testing
    of All Parameters.

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Parametrics Compare all products in Shift Register

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)
Output Drive (IOL/IOH) (Max) (mA)
3-State Output
Operating Temperature Range (C)
SN74HC165 SN54HC165 SN74HC165-EP SN74HC165-Q1
HC    HC    HC    HC   
2    2    2    2   
6    6    6    6   
6    6    6    5   
28    28    28    28   
0.08    0.08    0.08    0.08   
38    38    38    38   
5.2/-5.2    5.2/-5.2    5.2/-5.2    5.2/-5.2   
No    No    No    No   
Catalog    Military    HiRel Enhanced Product    Automotive   
-40 to 125    -55 to 125    -40 to 125    -40 to 125   

Other qualified versions of SN74HC165

Version Part Number Definition
Military SN54HC165 QML certified for Military and Defense Applications
Enhanced Product SN74HC165-EP Supports Defense, Aerospace and Medical Applications
Automotive SN74HC165-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects