DS1211 MAXIM | Alldatasheet
Document overview
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Technical content
C B A GND CE CE0 CE1 CE2 CE3 NC CE4 CE5 VBAT1 VCCO TOL PF CE7 CE6 C B A GND 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
FEATURES
/elevenoclock Converts full CMOS RAMs into nonvolatile memories /elevenoclock Unconditionally write protects when VCC is out of tolerance /elevenoclock Automatically switches to battery when power-fail occurs /elevenoclock 3 to 8 decoder provides control for up to eight CMOS RAMs /elevenoclock Consumes less than 100 nA of battery current /elevenoclock Tests battery condition on power-up /elevenoclock Provides for redundant batteries /elevenoclock Power-fail signal can be used to interrupt processor on power failure /elevenoclock Optional 5% or 10% power-fail detection /elevenoclock Optional 20-pin SOIC surface mount package /elevenoclock Optional industrial temperature range of -40°C to +85°C PIN ASSIGNMENT PIN DESCRIPTION A, B, C - Address Inputs CE - Chip Enable Input CE0 - CE7 - Chip Enable Outputs GND - Ground VBAT1 - + Battery 1 VBAT2 - + Battery 2 TOL - Power Supply Tolerance V CCI - +5V Supply VCC0 - RAM Supply PF - Power-fail NC - No Connection
DESCRIPTION
The DS1211 Nonvolatile Controller x 8 Chip is a CMOS circuit which solves the application problem of converting CMOS RAMs into nonvolatile memories. Incoming power is monitored for an out-of- tolerance condition. When such a condition is detected, the chip enables are inhibited to accomplish write protection and the battery is switched on to supply RAMs with uninterrupted power. Special circuitry uses a low-leakage CMOS process which affords precise voltage detection at extremely low battery consumption. By combining the DS1211 nonvolatile controller/decoder chip and lithium batteries, nonvolatile RAM operation can be achieved for up to eight CMOS memories. See the data sheet for the DS1212 Nonvolatile Controller x 16 Chip for electrical specifications and operation. DS1211 Nonvolatile Controller x 8 Chip www.dalsemi.com