DS1221 Nonvolatile Controller x 4 Chip
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dalsemi.
com NOT RECOMMENDED FOR NEW DESIGNS, SEE DS1321 DATASHEET INSTEAD.
FEATURES
Converts
CMOS RAMs into nonvolatile memories Data is automatically protected during power loss 2-to-4 decoder provides for up to 4
CMOS RAMs Provides for redundant batteries Test battery condition on power-up Full ±10% operating range Unauthorized access can be prevented with optional security feature 16-pin 0.
3-inch DIP saves PC board space Optional 16-pin SOIC surface mount package Optional industrial temperature range of -40°C to +85°C available
PIN ASSIGNMENT
VCCO VBAT1 *RST A B *RD *WE GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCCI VBAT2 CE CE0 CE1 CE2 CE3 *D...