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DS1210S
DS1210 Nonvolatile Controller Chip www.maxim-ic.com FEATURES § § § § § § § § § § § 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 DIP 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 16-Pin SOIC Surface Mount Package Optional Industrial (N) Temperature Range of -40°C to +85°C PIN ASSIGNMENT VCCO 1 8 VCCI VBAT1 2 7 VBAT2 TOL 3 6 CEO GND 4 5 CE DS1210 8-pin DIP (300-mil) See Mech. Drawings Section NC VCCO NC VBAT1 NC TOL NC GND 1 16 15 14 13 12 11 10 9 2 3 4 5 6 7 8 NC VCCI NC VBAT2 NC CEO NC CE DS1210S 16-pin SOIC (300-mil) See Mech. Drawings Section PIN DESCRIPTION VCCO VBAT1 TOL GND CE CEO VBAT2 VCCI NC - RAM Supply - + Battery 1 - Power Supply Tolerance - Ground - Chip Enable Input - Chip Enable Output - + Battery 2 - + Supply - No Connect DESCRIPTION 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 minimum. By combining the DS1210 Nonvolatile Controller Chip with a CMOS memory and batteries, nonvolatile RAM operation can be achieved. 1 of 6 090503
MAXIM
Maxim Integrated
U.S.A
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