DESCRIPTION These devices combine two popular functions, Watchdog Timer, and Serial E2PROM Memory in one package. This combination lowers system cost, reduces board space requirements, and increases reliability. FEATURES • Programmable Watchdog Timer with Reset Assertion —Reset Signal Valid to Vcc=1V —Power Up Reset Control • Save Critical Data With Block LockTM Protection —Block LockTM Protect 0, 1/4, 1/2 or all of Serial E2PROM Memory Array • In Circuit Programmable ROM Mode • Long Battery Life With Low Power Consumption —<50µA Max Standby Current, Watchdog On —<1µA Max Standby Current, Watchdog Off —<5mA Max Active Current during Write —<400µA Max Active Current during Read • 1.8V to 3.6V, 2.7V to 5.5V and 4.5V to 5.5V Power Supply Operation • 2MHz Clock Rate • Minimize Programming Time —32 Byte Page Write Mode —Self-Timed Write Cycle —5ms Write Cycle Time (Typical) • SPI Modes (0,0 & 1,1) • Built-in Inadvertent Write Protection —Power-Up/Power-Down Protection Circuitry —Write Enable Latch —Write Protect Pin • High Reliability • Available Packages —14-Lead SOIC (X2564x) —14-Lead TSSOP (X2532x, X2516x) —8-Lead SOIC (X2532x, X2516x)
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