X25043/45

Temperature under Bias .................. 65°C to +135°C
Storage Temperature ....................... 65°C to +150°C
Voltage on any Pin with Respect to V_SS .... 1.0V to +7V
D.C. Output Current ...................................................5mA
Lead Temperature
         (Soldering, 10 seconds) .............................. 300°C

Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.This is a stress rating only and the functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The X25043/45 combines three popular functions,Watchdog Timer, Voltage Supervision, and E²PROM in a single package. This combination lowers the system cost and reduces the board space requirements.

The Watchdog Timer provides an independent protection system for microcontrollers. During a system failure,the X25043/45 watchdog 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 system is protected from low voltage conditions by the X25043/45 low V_CC detection circuits. When V_CC drops below the minimum V_CC trip point, the system is reset. Reset is asserted until V_CC returns and stabilizes.The memory portion of the X25043/45 is a CMOS 4096-bit serial E²PROM, internally organized as 512 X 8. The X25043/45 features a Serial Peripheral Interface (SPI) and software protocol allowing operation on a simple three-wire bus.

The X25043/45 utilizes Xicor's proprietary Direct Write™ cell, providing a minimum endurance of 100,000 cycles per byte and a minimum data retention of 100 years.