DESCRIPTION
The DS1710 is a low-power CMOS circuit which solves the application problems of converting CMOS RAMS into nonvolatile memories. In addition the device has the ability to unconditionally write protect blocks of memory so that inadvertent write cycles do not corrupt program and special data space.

FEATURES
■ Converts CMOS RAMs into nonvolatile memories
■ Automatically selects +3.0V or +5.0V operation
■ SOIC version is pin-compatible with the Dallas Semiconductor DS1210S and DS1610S NV Controllers
■ Unconditionally write protects all of memory when VCC is out of tolerance
■ Write protects selected blocks of memory regardless of VCC status when programmed
■ Automatically switches to battery backup supply when power-fail occurs
■ Provides for multiple batteries
■ Consumes less than 100 nA of battery current
■ Test battery on power-up by inhibiting the second memory cycle
■ Optional 5% or 10% power-fail detection
■ 16-pin DIP or 16-pin SOIC surface mount package or 20-pin TSSOP package
■ Low forward voltage drop on the VCC switch with currents of up to 150 mA
■ Optional industrial temperature range of -40°C to +85°C