ZHCSSO6G June 1995 – March 2024 SN54ACT244 , SN74ACT244
PRODUCTION DATA
请参考 PDF 数据表获取器件具体的封装图。
Inputs should not float when using multiple bit logic devices. In many cases, functions or parts of functions of digital logic devices are unused. Some examples include situations when only two inputs of a triple-input AND gate are used, or when only 3 of the 4-buffer gates are used. Such input pins should not be left unconnected because the undefined voltages at the outside connections result in undefined operational states.
Specified in the Figure 8-3 are rules that must be observed under all circumstances. All unused inputs of digital logic devices must be connected to a high or low bias to prevent them from floating. The logic level that should be applied to any particular unused input depends on the function of the device. Generally, they will be tied to GND or VCC, whichever makes more sense or is more convenient.