DS1670E Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS1670E

Portable System Controller

Dallas Semiconductor -> Maxim Integrated 

DS1670

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 VCC. When VCC 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 (VCCO) is switched from VCC to VBAT. Upon

power up, access is prohibited until the end of tRPU.

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