DATASHEET X4043, X4045 FN8118 Rev 3.00 4k, 512 x 8 Bit CPU Supervisor with 4kbit EEPROM December 9, 2015 FEATURES DESCRIPTION Selectable watchdog timer The X4043/45 combines four popular functions, Low V detection and reset assertion Power-on Reset Control, Watchdog Timer, Supply CC Five standard reset threshold voltages Voltage Supervision, and Block Lock Protect Serial Adjust low V reset threshold voltage using EEPROM Memory in one package. This combination CC special programming sequence lowers system cost, reduces board space require- Reset signal valid to V = 1V ments, and increases reliability. CC Low power CMOS Applying power to the device activates the power-on <20A max standby current, watchdog on reset circuit which holds RESET/RESET active for a <1A standby current, watchdog OFF period of time. This allows the power supply and oscilla- 3mA active current tor to stabilize before the processor can execute code. 4kbits of EEPROM 16-byte page write mode The Watchdog Timer provides an independent protec- Self-timed write cycle tion mechanism for microcontrollers. When the micro- 5ms write cycle time (typical) controller fails to restart a timer within a selectable Built-in inadvertent write protection time out interval, the device activates the Power-up/power-down protection circuitry RESET/RESET signal. The user selects the interval Protect 0, 1/4, 1/2, all or 16, 32, 64 or 128 bytes from three preset values. Once selected, the interval of EEPROM array with Block Lock protection does not change, even after cycling the power. 400kHz 2-wire interface The devices low V detection circuitry protects the CC 2.7V to 5.5V power supply operation users system from low voltage conditions, resetting the Available packages system when V falls below the minimum V trip CC CC 8 Ld SOIC point. RESET/RESET is asserted until V returns to CC 8 Ld MSOP proper operating level and stabilizes. Five industry stan- 8 Ld PDIP dard V thresholds are available, however, Intersils TRIP Pb-free plus anneal available (RoHS compliant) unique circuits allow the threshold to be reprogrammed to meet custom requirements or to fine-tune the thresh- old for applications requiring higher precision. BLOCK DIAGRAM Watchdog Transition Watchdog Detector Timer Reset WP Protect Logic RESET (X4043) Data SDA RESET (X4045) Status Register Register EEPROM Array Command Reset & SCL Decode & Watchdog Control Timebase Logic V Threshold CC Reset logic Power-on and Low Voltage V + CC Reset - Generation V TRIP FN8118 Rev 3.00 Page 1 of 24 December 9, 2015 Block Lock Control 2Kbits 1Kb 1KbX4043, X4045 Ordering Information V V TEMP CC TRIP PART NUMBER RESET PART PART NUMBER RESET PART RANGE RANGE RANGE (ACTIVE LOW) MARKING (ACTIVE HIGH) MARKING (V) (V) (C) PACKAGE X4043S8Z-4.5A (Note) X4043 Z AL X4045S8Z-4.5A (Note) X4045 Z AL 4.5-5.5 4.5-4.75 0 to 70 8 Ld SOIC (Pb-free) X4043S8IZ-4.5A (Note) X4043 Z AM X4045S8IZ-4.5A (Note) X4045 Z AM -40 to 85 8 Ld SOIC (Pb-free) X4043M8Z-4.5A (Note) DAZ X4045M8Z-4.5A (Note) DBH 0 to 70 8 Ld MSOP (Pb-free) (No longer available, recommended replacement: X4045S8Z-4.5A) X4043M8IZ-4.5A (Note) DAU X4045M8IZ-4.5A (Note) DBE -40 to 85 8 Ld MSOP (Pb-free) (No longer available, recommended replacement: X4045S8IZ-4.5A) X4043PZ-4.5A (Note) X4043P Z AL X4045PZ-4.5A (Note) X4045P Z AL 0 to 70 8 Ld PDIP (Pb-free) (No longer available, (No longer available, recommended replacement: recommended replacement: X4043M8Z-4.5A) X4045S8Z-4.5A) X4043PIZ-4.5A (Note) X4043P Z AM X4045PIZ-4.5A (Note) X4045P Z AM -40 to 85 8 Ld PDIP (Pb-free) (No longer available, (No longer available, recommended replacement: recommended replacement: X4043M8IZ-4.5A) X4045S8IZ-4.5A) X4043S8Z* (Note) X4043 Z X4045S8Z* (Note) X4045 Z 4.5-5.5 4.25-4.5 0 to 70 8 Ld SOIC (Pb-free) X4043S8IZ* (Note) X4043 Z I X4045S8IZ (Note) X4045 Z I -40 to 85 8 Ld SOIC (Pb-free) X4043M8Z* (Note) DAW X4045M8Z (Note) DBD 0 to 70 8 Ld MSOP (Pb-free) (No longer available, recommended replacement: X4045S8Z) X4043M8IZ (Note) DAR X4045M8IZ (Note) DBA -40 to 85 8 Ld MSOP (Pb-free) (No longer available, recommended replacement: X4045S8IZ) X4043PZ (Note) X4043P X4045PZ (Note) X4045P Z 0 to 70 8 Ld PDIP (Pb-free) (No longer available, (No longer available, recommended replacement: recommended replacement: X4043M8Z) X4045S8Z) X4043PIZ (Note) X4043P Z I X4045PIZ (Note) X4045P Z I -40 to 85 8 Ld PDIP (Pb-free) (No longer available, (No longer available, recommended replacement: recommended replacement: X4043M8IZ) X4045S8IZ) FN8118 Rev 3.00 Page 2 of 24 December 9, 2015