N84C163 Supervisory Circuits with 2 EEPROM Serial 16-Kb I C Precision Reset Controller and Watchdog Timer (16K) www.onsemi.com Description The N84C163 is a complete memory and supervisory solution for microcontrollerbased systems. A serial EEPROM memory (16K) with hardware memory write protection, a system power supervisor with brown out protection and a watchdog timer are integrated together in low power CMOS technology. Memory interface is via an SOIC8 2 I C bus. CASE 751BD The 1.6second watchdog circuit returns a system to a known good state if a software or hardware glitch halts or hangs the system. The PIN CONFIGURATION N84C163 watchdog monitors the WDI input pin. The power supply monitor and reset circuit protects memory and SOIC 8 Lead system controllers during power up/down and against brownout WDI 1 8 V conditions. Five reset threshold voltages support 5 V, 3.3 V and 3 V CC systems. If power supply voltages are out of tolerance reset signals RESET 2 7 RESET N84C163 become active, preventing the system microcontroller, ASIC or 3 6 WP SCL peripherals from operating. Reset signals become inactive typically GND 4 5 SDA 200 ms after the supply voltage exceeds the reset threshold level. With both active high and low reset signals, interface to microcontrollers and other ICs is simple. In addition, a reset pin can be used as a PIN FUNCTIONS debounced input for pushbutton manual reset capability. The N84C163 memory features a 16byte page. In addition, Pin Name Function hardware data protection is provided by a write protect pin WP and by WDI Watchdog Timer Input a V sense circuit that prevents writes to memory whenever V falls CC CC RESET Active Low Reset I/O below the reset threshold or until V reaches the reset threshold CC WP Write Protect during power up. This device is available in a green SOIC8 package. GND Ground SDA Serial Data/Address Features SCL Clock Input Watchdog Timer Input (WDI) 2 RESET Active High Reset I/O 400 kHz I C Bus Compatible V Power Supply CC 2.7 V to 6.0 V Operation Low Power CMOS Technology 16Byte Page Write Buffer ORDERING INFORMATION Builtin Inadvertent Write Protection For Ordering Information details, see page 10. V Lock Out CC Write Protection Pin, WP 100 Year Data Retention Active High or Low Reset Precision Power Supply Voltage Monitor 8Pin SOIC Package 5 V, 3.3 V and 3 V Systems Commercial and Industrial Temperature Ranges Five Threshold Voltage Options These Devices are PbFree, Halogen Free/BFR Free 1,000,000 Program/Erase Cycles and are RoHS Compliant Manual Reset Semiconductor Components Industries, LLC, 2016 1 Publication Order Number: May, 2018 Rev. 1 N84C163/DN84C163 Table 1. RESET THRESHOLD OPTION Part Dash Minimum Maximum Number Threshold Threshold 45 4.50 4.75 42 4.25 4.50 30 3.00 3.15 28 2.85 3.00 25 2.55 2.70 BLOCK DIAGRAM EXTERNAL LOAD SENSEAMPS D OUT SHIFT REGISTERS ACK V CC WORD ADDRESS COLUMN GND BUFFERS DECODERS STA RT/ STOP SDA LOGIC 16K EEPROM XDEC CONTROL WP LOGIC DATA IN STORAGE HIGH VOLTAGE/ TIMING CONTROL RESET Controller STATE COUNTERS SCL Precision SLAVE WAT CH DO G ADDRESS Vcc Monitor COMPARATORS WDI RESETRESET www.onsemi.com 2