This application note introduces a power supply concept for the C515C and deals with the enhanced feature of this controller to switch off the Address Latch Enable (ALE) output signal during accesses to internal ROM. 1 Introduction 3 2 Dedicated Power Supply Pins of the C515C 3 3 On-chip Power Supply Concept 3 4 PCB Power Supply Concept 4 5 ALE Switch Off Feature 5 6 Conclusion 6