DS1234 Datasheet (Dallas) - Conditional Nonvolatile Controller Chip

DS1234, Conditional Nonvolatile Controller Chip

VCCO NC * RAM Supply * No Connection CEI * Chip Enable Input WEI * Write Enable Input CEO * Chip Enable Output to RAM WEO * Write Enable Output to RAM GND * Ground PF * Power Fail Output A0-A3 * Address Inputs VBAT

DS1234 Features

* Converts CMOS static RAMs into nonvolatile memories

* Software-controlled write inhibit

* Software-controlled battery disconnect extends battery life

* Unconditionally write protects when VCC is out of tolerance

* Consumes less than 100 nA of battery current