19-6295; Rev 6/12
DS1218 Nonvolatile Controller
FEATURES
Converts
CMOS RAM into nonvolatile memories
Unconditionally write protects when VCC is out of tolerance
Automatically switches to battery when power fail occurs
Space saving 8-pin PDIP or 8-pin 150 mil SO Packages
Consumes less than 100nA of battery current
PIN ASSIGNMENT
VCCO NC NC
GND
1 2 3 4
8 VCCI 7 VBAT 6 CEO 5 CEI
PIN DESCRIPTION
VCCI - Input +5 Volt Supply
VCCO
- RAM Power (VCC) Supply
CEI - Chip Enable Input NC - No Connection
CEO
VBAT GND
- Chip Enable Output - + Battery - Ground
DESCRIPTION
The DS1218 is a
CMOS circuit which solves the application problems of converting
CMOS RAM into nonvolatile memory...