DS1610

The DS1610 is a low-power CMOS circuit which solves the application problems of converting CMOS RAMS into nonvolatile memories. In addition the device has the ability to unconditionally write protect blocks of memory so that inadvertent write cycles do not corrupt program and special data space. The power supply incoming voltage at the VCCI input pin is constantly monitored for an out-of-tolerance condition. When such a condition is detected, both the chip enable and write enable outputs are inhibited to protect stored data. The battery inputs are used to supply V_CCO with power when V_CCI is less than the battery input voltages. Special circuitry uses a low leakage CMOS process which affords precise voltage detection at extremely low current consumption. By combining the DS1610 Partitioned NV Controller chip with a CMOS memory and batteries, nonvolatile RAM operation can be achieved.

The DS1610 Partitioned NV Controller functions like the Dallas Semiconductor DS1210 NV controller when the (DIS) disable pin is grounded. An internal pulldown resistor to ground on the DIS pin of the DS1610S allows it to retrofit into DS1210S applications. When the DIS pin is grounded the address inputs AW - AZ and the write enable input WEI are ignored. Also the power-fail output PFO and the write enable output WEO are tristated.