X25325

The X25325 combine three popular functions, Watchdog Timer, Supply Voltage Supervision, and Serial E2PROM Memory in one package. This combination lowers system cost, reduces board space requirements, and increases reliability.

The Watchdog Timer of X25325 provides an independent protection mechanism for microcontrollers. During a system failure, the device will respond with a RESET/RESET signal after a selectable time-out interval. The user selects the interval from three preset values. Once selected, the interval does not change, even after cycling the power.

The user's system is protected from low voltage conditions by the X25325's low Vcc detection circuitry. When Vcc falls below the minimum Vcc trip point, the system is reset. RESET/RESET is asserted until Vcc returns to proper operating levels and stabilizes.

The memory portion of the X25325 is a CMOS Serial E²PROM array with Xicor's Block LockTM Protection. The array is internally organized as x 8. The device features a Serial Peripheral Interface (SPI) and software protocol allowing operation on a simple four-wire bus.

The X25325 utilizes Xicor's proprietary Direct WriteTM cell, providing a minimum endurance of 100,000 cycles per sector and a minimum data retention of 100 years.