A logic family has signal levels as shown in Table 1.3. We connect device A’s output to B’s inputs using this logic family. All signal levels are relative to the local ground. How much can the ground voltages of the two devices (GNDA and GNDB) differ before an error occurs? Compute the difference both for how much higher GNDA can be relative to GNDB and for how much lower GNDA can be relative to GNDB. 

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Table 1.3. Voltage levels for Exercise 1.4 Parameter VOL VIL VIH VOH Value 0.1 V 0.4 V 0.6 V 0.8 V