These 8-bit registers feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. The high-impedance 3-state and increased high-logic-level drive provide these registers with the capability of being connected directly to and driving the bus lines in a bus-organized system without need for interface or pullup components. These devices are particularly attractive for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

The eight latches of the ’LS373 and ’S373 are transparent D-type latches, meaning that while the enable (C or CLK) input is high, the Q outputs follow the data (D) inputs. When C or CLK is taken low, the output is latched at the level of the data that was set up.

The eight flip-flops of the ’LS374 and ’S374 are edge-triggered D-type flip-flops. On the positive transition of the clock, the Q outputs are set to the logic states that were set up at the D inputs.

Schmitt-trigger buffered inputs at the enable/clock lines of the ’S373 and ’S374 devices simplify system design as ac and dc noise rejection is improved by typically 400 mV due to the input hysteresis. A buffered output-control (OC) input can be used to place the eight outputs in either a normal logic state (high or low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly.

OC\ does not affect the internal operation of the latches or flip-flops. That is, the old data can be retained or new data can be entered, even while the outputs are off.

• Choice of Eight Latches or Eight D-Type Flip-Flops in a Single Package
• 3-State Bus-Driving Outputs
• Full Parallel Access for Loading
• Buffered Control Inputs
• Clock-Enable Input Has Hysteresis to Improve Noise Rejection (’S373 and ’S374)
• P-N-P Inputs Reduce DC Loading on Data Lines (’S373 and ’S374)

• Number of channels (#)
• 8
• Technology Family
• S
• Supply voltage (Min) (V)
• 4.75
• Supply voltage (Max) (V)
• 5.25
• Input type
• Bipolar
• Output type
• 3-State
• Clock Frequency (Max) (MHz)
• 50
• IOL (Max) (mA)
• 20
• IOH (Max) (mA)
• -6.5
• ICC (Max) (uA)
• 180
• Features
• High speed (tpd 10-50ns)

SN54S374的完整型号有：SN54S374J、SNJ54S374FK、SNJ54S374J、SNJ54S374W，以下是这些产品的关键参数及官网采购报价：

SN54S374J，工作温度：-55 to 125，封装：CDIP (J)-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SN54S374J的批量USD价格：15.986（1000+）

SNJ54S374FK，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SNJ54S374FK的批量USD价格：20.78（1000+）

SNJ54S374J，工作温度：-55 to 125，封装：CDIP (J)-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SNJ54S374J的批量USD价格：18.936（1000+）

SNJ54S374W，工作温度：-55 to 125，封装：CFP (W)-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SNJ54S374W的批量USD价格：21.447（1000+）