DS1210DESCRIPTION The DS1210 Nonvolatile Controller Chip is a CMOS circuit which solves the application problem of converting CMOS RAM into nonvolatile memory. Incoming power is monitored for an out-of-tolerance condition. When such a condition is detected, chip enable is inhibited to accomplish write protection and the battery is switched on to supply the RAM with uninterrupted power. Special circuitry uses a lowleakage CMOS process which affords precise voltage detection at extremely low battery consumption. The 8-pin DIP package keeps PC board real estate requirements to a minimu m. By combining the DS1210 Nonvolatile Controller Chip with a CMOS memory and batteries, nonvolatile RAM operation can be achievedFEATURES --Converts CMOS RAMs into Nonvolatile Memories --Unconditionally Write Protects when VCC is Out-of-Tolerance--Automatically Switches to Battery when Power-Fail Occurs --Space-Saving 8-Pin PDIP or 16-Pin SO Packages--Consumes <100nA of Battery Current --Tests Battery Condition on Power up --Provides for Redundant Batteries --Optional 5% or 10% Power-Fail Detection --Low Forward Voltage Drop on the VCC Switch --Optional Industrial (N) Temperature Range of -40°C to +85°CPIN DESCRIPTION --Vcco - RAM Supply --VBAT1 - + Battery 1 --TOL - Power Supply Tolerance --GND - Ground --CE - Chip Enable Input --CEO - Chip Enable Output --VBAT2 - + Battery 2 --VCCI - + Supply --NC - No Connect
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