R5105N Series Compact Watchdog Timer with VD The R5105N Series are CMOS-based system power ICs with a voltage detector (VD) and watchdog timer (WDT) integrated in a single chip. R5105N 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. FEATURES * Supply Current (ISS) ************************Typ. 11A (VDD=-VDET+0.5V, * Output Delay Time (tPLH)***************** Typ. 370ms (CD=0.1F) * Output Delay Time Accuracy********** 16% (-40C <= Topt <= 105C) Clock pulse input) * Operating Voltage Range (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 (CTW=0.1F) * Reset Hold Time of WDT (tWR) ******* Typ. 34ms (CTW=0.1F) * Watchdog Timeout Period Accuracy **** 33% (-40C <= Topt <= 105C) * 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 R5105Nxx1A R5105Nxx1C (Nch. open drain output) (CMOS output) VDD 3 VDD 3 CD 6 CD 6 Power Supply Microprocessor VDD Vref2 5 GND WATCHDOG TIMER CLOCK DETECTOR 3 VDD Vref2 Vref1 CTW 2 R 5 GND WATCHDOG TIMER 1 SCK RESETB 4 RESET Vref1 CTW 2 CLOCK DETECTOR R5105Nxx1A Series SCK 1 CTW 2 I/O 1 SCK 6 CD CD GND CTW 5 RESETB 4 RESETB 4 SELECTION GUIDE Package Quantity per Reel Part No. SOT-23-6 3,000 pcs R5105N.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 tPHL tPHL VCD +VTCD 1 2 -VTCD 3 tWD 1 SCK 2 CTW 3 4 5 VDD RESETB GND 6 CD Watchdog timer clock input pin Ext. Cap. pin for setting reset and watchdog timeout period of WDT Power supply pin Output pin for Reset "L" signal Ground pin Ext. Cap. pin for setting output delay time of VD tWDI Vref2H VCTW Vref2L tPLH tPLH VSCK tWR VRESETB APPLICATION * Monitoring of the power system of devices equipped with microprocessors No.EK-159-091101 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. Please be sure to take any necessary formalities under relevant laws or regulations before exporting or otherwise taking out of your country the products or the technical information described herein. 4. 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