R5106N Series Compact Watchdog Timer Equipped with Inhibit Pin with VD The R5106N Series are CMOS-based system power ICs with a voltage detector (VD) and watchdog timer (WDT) integrated in a single chip. R5106N monitors the power system of devices equipped with microprocessors and prevents system runaway with a reset signal when a malfunction occurs. The output delay time of the VD and watchdog timeout period/reset time can be adjusted high accuracy by an external capacitor. The R5106N is equipped with the function that inhibits clock monitoring of the WDT (INH). FEATURES * Supply Current (ISS) ************************ Typ. 11A (VDD=-VDET+0.5V, * Output Delay Time (tPLH)***************** Typ. 370ms (CT=0.1F) * Output Delay Time Accuracy********** 16% (-40C Topt 105C) Clock pulse input) * Operating Voltage (VDD)****************** 0.9V to 6.0V (VD Section) * Detector Threshold Range (-VDET) *** 1.5V to 5.5V (internally fixed) * Detector Threshold Accuracy ********** 1% * Temp. coeff. of Detector Threshold *** Typ. 100ppm/C (WDT Section) * Watchdog Timeout Period (tWD)****** Typ. 310ms (CT=0.1F) * Reset Hold Time of WDT (tWR) ******* Typ. 34ms (CT=0.1F) * Watchdog Timeout Period Accuracy **** 33% (-40C Topt 105C) * Able to stop watchdog timer *********** Inhibit (INH) Pin * Package ***************************************** SOT-23-6 (The above shows specification at Topt=25C. Design assurance value at -40C Topt 105C is also available. For details, please refer to the datasheet.) BLOCK DIAGRAMS TYPICAL APPLICATION R5106Nxx1A R5106Nxx1C (Nch. open drain output) (CMOS output) Power Supply VDD 3 Microprocessor VDD 3 SW1 SW1 3 VDD Vref2 CT 6 Vref1 Vref2 5 GND SW2 WATCHDOG TIMER CLOCK DETECTOR CT 6 Vref1 WATCHDOG TIMER CLOCK DETECTOR RESETB 4 1 SCK SW 2 INH GND 5 RESETB 4 2 INH RESETB 4 SELECTION GUIDE Halogen Free RESET R5106Nxx1A 1 Series SCK 5 GND SW2 1 SCK VDD R I/O CT 6 CT 2 INH TIMING CHART Package Q'ty per Reel SOT-23-6 3,000 pcs Part No. R5106N.xx.1. -TR-FE VDD +VDET -VDET .xx : Specify the detector threshold within the range of 1.5V (.15.) to 5.5V (.55.) in 0.1V steps. . : Select the output type from (.A.) Nch. open drain or (.C.) CMOS. PACKAGE (Top View) VINH SOT-23-6 6 5 4 tWD tPLH tWDI Vref2H VCT Vref2L tPHL 1 2 3 VSCK 1 2 3 4 5 SCK INH VDD RESETB GND 6 CT Watchdog timer clock input pin Inhibit pin Power supply pin Output pin for Reset "L" signal Ground pin Ext. Cap. pin for setting reset and watchdog timeout period of WDT and output delay time of VD APPLICATION t PLH tWR VRESETB Vref2H Vref2L tPHL tWDI : CTW pin voltage at the end of WDT timeout period. : CTW pin voltage at the begin of WDT timeout period. : Output delay time : tWD/10 (SCK pulses input during this period are ignored.) * Monitoring of the power system of devices equipped with microprocessors No.EK-169-111001 CMOS Microprocessor Supervisory 1. The products and the product specifications described in this document are subject to change or discontinuation of production without notice for reasons such as improvement. Therefore, before deciding to use the products, please refer to Ricoh sales representatives for the latest information thereon. 2. The materials in this document may not be copied or otherwise reproduced in whole or in part without prior written consent of Ricoh. 3. 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