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 low leakage 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.

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