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Circuit controls ratiometric or simultaneous power-up of multiple rails -
13-May-04 Issue of EDN Many applications use FPGAs, ASICs, or DSP chips, which
usually require multiple voltage rails, typically two the core voltage and the
I/O voltage. The core voltage is usually lower than the I/O voltage. Guidelines for
determining how to power up two orvoltage rails depend on the part and the
manufacturer you use....[Design Idea by Dirk Gehrke, Texas Instruments, Freising,
Germany]