A diode logic level step-up circuit. From Microchip app note DS41285A (PDF). For stepping up from 3.3V logic to 5V logic and assuming you are not safely within the TTL thresholds as described ...
A practical diode switch usually works by maintain one side of the diode at a bias point so that when a logic level is applied to the other point it will switch the diode from forward to reverse ...
Diodes Inc. manufactures and supplies application-specific standard products within the broad discrete, logic, analog, and mixed-signal semiconductor markets. The firm offers diodes, rectifiers ...