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)