Cypress - AN49947

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Contents

y CYPRESS PERFORM Undershoot Effect in RTC Circuit of 0 25iu nvSRAM AN49947 Associated Part Family CY14BXXXK STK17TX8 GET FREE SAMPLES HERE Application Note Abstract This application note describes the undershoot effect in the RTC circuit of the 256K and 1M nvSRAM in 0 25ju technology The part numbers affected are CY14B256K STK17T88 and CY14B101K STK17TA8 Introduction Under certain noise conditions the Real Time Clock RTC circuit of CY14BXXXK STK17TX8 can be disturbed to the point that the oscillator circuit stops Undershoot in Application The RTC devices in 0 25jli specify in the data sheet that inputs may not undershoot by more than 0 5V This is diffi cult to achieve in systems where signal fall times are fast 1 to 3 ns As a result of ...