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)