DS1312

19-6306; Rev 6/12 ` DS1312 Nonvolatile Controller with Lithium Battery Monitor FEATURES  Converts CMOS SRAM into nonvolatile memory  Unconditionally write-protects SRAM when VCC is out of tolerance  Automatically switches to battery backup supply when VCC power failure occurs  Monitors voltage of a lithium cell and provides advanced warning of impending battery failure  Signals low-battery condition on active low Battery Warning output signal  Optional 5% or 10% power-fail detection  Space-saving 8-pin DIP and SOIC packages  Optional 16-pin SOIC and 20-pin TSSOP versions reset processor when power failure occurs and hold processor in reset during system power-up  Industrial temperature range of -40°C to +85°C PIN ASSIGNMENT VCCO VBAT TOL GND 1 2 3 4 8 VCCI 7 BW 6 CEO 5 CEI DS1312 8-Pin DIP (300 mils) VCCO VBAT TOL GND 1 2 3 4 8 VCCI 7 BW 6 CEO 5 CEI DS1312S-2 8-Pin SOIC (150 mils) NC VCCO NC VBAT NC TOL NC GND 1 2 3 4 5 6 7 8 16 NC 15 VCCI 14 RST 13 NC 12 BW 11 CEO 10 NC 9 CEI DS1312S 16-Pin SOIC (300 mils) NC VCCO NC VBAT NC NC TOL NC NC GND 1 2 3 4 5 6 7 8 9 10 20 NC 19 VCCI 18 RST 17 NC 16 NC 15 BW 14 NC 13 CEO 12 NC 11 CEI DS1312E 20-Pin TSSOP PIN DESCRIPTION VCCI VCCO VBAT - +5V Power Supply Input - SRAM Power Supply Output - Backup Battery Input CEI - Chip Enable Input CEO TOL BW - Chip Enable Output - VCC Tolerance Select - Battery Warning Output (Open Drain) RST GND NC - Reset Output (Open Drain) - Ground - No Connection DESCRIPTIO...