DESCRIPTION

The X4043/45 combines four popular functions,

Power-on Reset Control, Watchdog Timer, Supply

Voltage Supervision, and Block Lock Protect Serial

EEPROM Memory in one package. This combination

lowers system cost, reduces board space requirements, and increases reliability.

Applying power to the device activates the power-on

reset circuit which holds RESET/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/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 minimum VCC trip

point. RESET/RESET is asserted until VCC returns to

proper operating level and stabilizes. Five industry standard VTRIP thresholds are available, however, Intersil’s

unique circuits allow the threshold to be reprogrammed

to meet custom requirements or to fine-tune the threshold for applications requiring higher precision.

FEATURES

• Selectable watchdog timer

• Low VCC detection and reset assertion

—Five standard reset threshold voltages

—Adjust low VCC reset threshold voltage using

special programming sequence

—Reset signal valid to VCC = 1V

• Low power CMOS

—<20µA max standby current, watchdog on

—<1µA standby current, watchdog OFF

—3mA active current

• 4kbits of EEPROM

—16-byte page write mode

—Self-timed write cycle

—5ms write cycle time (typical)

• Built-in inadvertent write protection

—Power-up/power-down protection circuitry

—Protect 0, 1/4, 1/2, all or 16, 32, 64 or 128 bytes

of EEPROM array with Block Lock™ protection

• 400kHz 2-wire interface

• 2.7V to 5.5V power supply operation

• Available packages

—8 Ld SOIC

—8 Ld MSOP

—8 Ld PDIP

• Pb-free plus anneal available (RoHS compliant)