These 4-bit registers feature parallel inputs, parallel outputs, J-K\ serial inputs, shift/load (SH/LD\) control input, and a direct overriding clear. All inputs are buffered to lower the input drive requirements. The register has two modes of operation:

Parallel (broadside) loadShift (in the direction Q_A toward Q_D)

Parallel loading is accomplished by applying the four bits of data and taking SH/LD\ low. The data is loaded into the associated flip-flop and appears at the outputs after the positive transition of the clock input. During loading, serial data flow is inhibited.

Shifting is accomplished synchronously when SH/LD\ is high. Serial data for this mode is entered at the J-K\ inputs. These inputs permit the first stage to perform as a J-K\, D-, or T-type flip-flop as shown in the function table.

The high-performance 'S195, with a 105-megahertz typical maximum shift-frequency, is particularly attractive for very-high-speed data processing systems. In most cases existing systems can be upgraded merely by using this Schottky-clamped shift register.

• Synchronous Parallel Load
• Positive-Edge-Triggered Clocking
• Parallel Inputs and Outputs from Each Flip-Flop
• Direct Overriding Clear
• J and K\ Inputs to First Stage
• Complementary Outputs from Last Stage
• For Use in High Performance:
  • Accumulators/Processors
  • Serial-to-Parallel, Parallel-to-Serial Converters

• Configuration
• Universal
• Bits (#)
• 4
• Technology Family
• LS
• Supply voltage (Min) (V)
• 4.5
• Supply voltage (Max) (V)
• 5.5
• Input type
• Bipolar
• Output type
• Push-Pull
• Clock Frequency (MHz)
• 25
• IOL (Max) (mA)
• 8
• IOH (Max) (mA)
• -0.4
• ICC (Max) (uA)
• 63000
• Features
• High speed (tpd 10-50ns)

SN54LS195A的完整型号有：JM38510/30602B2A、JM38510/30602BEA、M38510/30602B2A、M38510/30602BEA、SN54LS195AJ、SNJ54LS195AJ，以下是这些产品的关键参数及官网采购报价：

JM38510/30602B2A，工作温度：-55 to 125，封装：LCCC (FK)-20，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网JM38510/30602B2A的批量USD价格：17.017（1000+）

JM38510/30602BEA，工作温度：-55 to 125，封装：CDIP (J)-16，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网JM38510/30602BEA的批量USD价格：11.475（1000+）

M38510/30602B2A，工作温度：-55 to 125，封装：LCCC (FK)-20，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网M38510/30602B2A的批量USD价格：17.017（1000+）

M38510/30602BEA，工作温度：-55 to 125，封装：CDIP (J)-16，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网M38510/30602BEA的批量USD价格：11.475（1000+）

SN54LS195AJ，工作温度：-55 to 125，封装：CDIP (J)-16，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网SN54LS195AJ的批量USD价格：7.957（1000+）

SNJ54LS195AJ，工作温度：-55 to 125，封装：CDIP (J)-16，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网SNJ54LS195AJ的批量USD价格：7.084（1000+）