X25043

APPLICATION NOTES A V A I L A B L E AN11 AN21 X25043/45 4K X25043/45 Programmable Watchdog Supervisory E2PROM DESCRIPTION 512 x 8 Bit FEATURES Programmable Watchdog Timer Low VCC Detection Reset Signal Valid to VCC = 1V 1MHz Clock Rate 512 X 8 Bits Serial E2PROM —4 Byte Page Mode Low Power CMOS —50µA Standby Current —3mA Active Current 2.7V To 5.5V Power Supply Block LockTM —Protect 1/4, 1/2 or all of E2PROM Array Built-in Inadvertent Write Protection —Power-Up/Power-Down protection circuitry —Write Latch —Write Protect Pin High Reliability —Endurance: 100,000 cycles per byte —Data Retention: 100 Years —ESD protection: 2000V on all pins Available Packages —8-Lead PDlP —8-Lead SOIC —14-Lead TSSOP X25043 = Active LOW RESET X25045 = Active HIGH RESET 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 VCC detection circuits. When VCC drops below the minimum VCC trip point, the system is reset...