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介绍XC9500 CPLD器件的电源序列

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Mixed signal systems - typically 5V/3.3V today - requirelogic parts that can operate with two power supplies. XilinxXC9500 CPLDs are designed to operate in either mixed5V/3.3V systems or 5V only systems. To handle both conditions,care has been taken to assure that designers neednot introduce elaborate circuitry to guarantee that 5V and3.3V power supplies rise or fall in any particular sequence.This application note describes the underlying XC9500 circuitryto give designers the understanding they need tobest use these powerful CPLDs.
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