Two systems, A and B, use the encoding of Table 1.1 to send logic signals to one another. Suppose there is a voltage shift between the two systems’ power supplies so that all voltages in A are VN higher than in B. A voltage of Vx in system A appears as a voltage of V_x + VN in system B. A voltage of V_x in system B appears as a voltage of V_x − V_N in system A. Assuming that there are no other noise sources, over what range of V_N will the system operate properly?

Data in Table 1.1

Parameter V min Vo VOL VIL VIH VOH V Vmax Value -0.3 V 0.0 V 0.2 V 0.7 V 1.7 V 2.1 V 2.5 V 2.8 V Description absolute minimum voltage below which damage occurs nominal voltage representing logic "0" maximum output voltage representing logic "0" maximum voltage considered to be a logic "0" by a module input minimum voltage considered to be a logic "1" by a module input minimum output voltage representing logic "1" nominal voltage representing logic "1" absolute maximum voltage above which damage occurs