Rainbow-electronics DS1670 Manuel d'utilisateur télécharger pdf (Page 7)

DS1670

7 of 17

The DS1670 nonvolatilizes the external SRAM(s) by write protecting the SRAM(s) and by providing a

back-up power supply in the absence of V

. When V

falls below 2.88 volts (typical), access to the

external SRAM(s) are prohibited by forcing

CEOL and CEOH high regardless of the level of CEI , BLE ,

and

BHE . Also at this point, the SRAM power supply (V

CCO

) is switched from V

to V

BAT

. Upon

power up, access is prohibited until the end of t

RPU

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Rainbow-electronics DS1670 Manuel d'utilisateur Page 7