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 with 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 VDD SW1 SW1 R 3 VDD Vref2 CT Vref1 Vref2 5 GND 6 SW2 WATCHDOG TIMER CT 6 1 SCK WATCHDOG TIMER RESET R5106Nxx1A 1 Series SCK 5 GND SW2 CLOCK DETECTOR RESETB 4 Vref1 CLOCK DETECTOR 1 SCK SW 2 INH GND I/O CT 6 CT 5 RESETB 4 2 INH RESETB 4 2 INH SELECTION GUIDE Package Quantity per Reel Part No. SOT-23-6 3,000 pcs R5106N.xx.1. -TR-F PACKAGE (Top View) .xx. : Specify the detector threshold within the range 1.5V (.15.) to 5.5V (.55.) in 0.1V steps. . : Select the output type from (.A.) Nch. open drain or (.C.) CMOS. TIMING CHART SOT-23-6 6 5 4 VDD +VDET -VDET VINH 1 2 3 tWD 1 2 3 4 5 6 SCK INH VDD RESETB GND 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 tPLH tWDI Vref2H VCT Vref2L tPHL VSCK tPLH tWR VRESETB APPLICATION * Monitoring of the power system of devices equipped with microprocessors No.EK-169-091101 tPHL : Output delay time tWDI : tWD/10 (SCK pulses input during this period are ignored.) 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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