SCAS289N January 1993 – December 2024 SN74LVC112A
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
Inputs should not float when using multiple bit logic devices. Functions or parts of functions of digital logic devices are unused in many cases. Some examples include situations in which 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 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. It is acceptable to float outputs unless the part is a transceiver.