DM74S374的技术资料

DM74S374的产品特征：
●Choice of 8 latches or 8 D-type flip-flops in a single package
●3-STATE bus-driving outputs
●Full parallel-access for loading
●Buffered control inputs
●P-N-P input reduce D-C loading on data lines

DM74S374的技术参数：
Supply Voltage                                                                       7V
Input Voltage                                                                      5.5V
Operating Free Air Temperature Range              0°C to +70°C
Storage Temperature Range                        −65°C to +150°C 

DM74S374的产品描述：

These 8-bit registers feature totem-pole 3-STATE outputs designed specifically for driving highly-capacitive or relatively low-impedance loads. The high impedance 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 pull-up components. They are particularly attractive for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

The eight latches of the DM74S373 are transparent D-type latches meaning that while the enable (G) is HIGH the Q outputs will follow the data (D)inputs. When the enable is taken LOW the output will be latched at the level of the data that was set up.

The eight flip-flops of the DM74S374 are edge-triggered D-type flip-flops. On the positive transition of the clock, the Q outputs will be set to the logic states that were set up at the D inputs.

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

The output control 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.