DS1211
FEATURES
Converts full CMOS RAMs into nonvolatile memories Unconditionally write protects when VCC is out of tolerance Automatically switches to battery when power-fail occurs 3 to 8 decoder provides control for up to eight CMOS RAMs Consumes less than 100 n A of battery current Tests battery condition on power-up Provides for redundant batteries Power-fail signal can be used to interrupt processor on power failure Optional 5% or 10% power-fail detection Optional 20-pin SOIC surface mount package Optional industrial temperature range of -40°C to +85°C
PIN ASSIGNMENT
VBAT1 VCCO TOL PF CE7 CE6 C B A GND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCCI VBAT2 CE CE0 CE1 CE2 CE3 NC CE4 CE5 VBAT1 VCCO TOL PF CE7 CE6 C B A GND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCCI VBAT2 CE CE0 CE1 CE2 CE3 NC CE4 CE5
20-Pin DIP (300-mil) See Mech. Drawings Section
20-Pin SOIC (300-mil) See Mech. Drawings Section
PIN DESCRIPTION
A, B, C
CE CE0
- Address Inputs
- Chip Enable Input
-...
