X40626 Datasheet | Xicor

DESCRIPTION 8K x 8 Bit FEATURES - Dual voltage monitoring - V2Mon operates independent of VCC - Watchdog timer with selectable timeout intervals - Low VCC detection and reset assertion - Four standard reset threshold voltages - User programmable VTRIP threshold - Reset signal valid to VCC=1V - Low power CMOS - 20µA max standby current, watchdog on - 1µA standby current, watchdog OFF - 64Kbits of EEPROM - 64 byte page size - Built-in inadvertent write protection - Power-up/power-down protection circuitry - Protect 0, 1/4, 1/2, all or 64, 128, 256 or 512 bytes of EEPROM array with programmable Block Lock™ protection - 400k Hz 2-wire interface - Slave addressing supports up to 4 devices on the same bus - 2.7V to 5.5V power supply operation - Available Packages - 14-lead SOIC - 14-lead TSSOP BLOCK DIAGRAM V2MON V2 Monitor Logic Watchdog Transition Detector WP Data Register mand Decode & Control Logic VCC Threshold Reset logic Block Lock Control The X40626 bines four popular functions, Power-on Reset Control, Watchdog Timer, Dual Supply Voltage Supervision, and Serial EEPROM Memory in one package. This bination lowers system cost, reduces board space requirements, and increases reliability. Applying power to the device activates the power on reset circuit which holds RESET active for a period of time. This allows the power supply and oscillator to stabilize before the processor can execute code. The Watchdog Timer provides an independent protection mechanism for microcontrollers. When the microcontroller fails to restart a timer within a selectable time-out interval, the device activates the RESET signal. The user selects the interval from three preset values. Once selected, the interval does not change, even after cycling the power. The device’s low VCC detection circuitry protects the user’s system from low voltage conditions, resetting the system when VCC falls below the set minimum VCC trip point. RESET is asserted until VCC returns to proper + VTRIP2 - V2FAIL Watchdog...