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Isolated Logic Level Shifters - AB-4: This application note discusses IsoLoop isolators being used to isolate and level-shift data between 5V logic and 3.3V logic. . (added 6/06)
Key Reading Circuit Saves I/O Pins: 02/06/03 EDN-Design Ideas / (added 9/03) Some microcontroller applications
usually use too many I/O pins to read keys or onboard switches; in many cases, few pins remain available for other uses. Some alternative ways to read keys yield more free pins. First,
consider some ways to effect key reading. Table 1 presents a comparison of four methods with references to circuit configurations (figures 1, 2, 3, and 4)
Keys to Longer Life for CMOS: AN-349 Analog Devices Application Notes (app note added 2/06) Here's How CMOS Can be Protected Against Abuse
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