RICOH R5105N Technical data

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 by an external capacitor.

FEATURES

• Supply Current (ISS) ························Typ. 11μA (VDD=-VDET+0.5V,	• Output Delay Time (tPLH)················· Typ. 370ms (CD=0.1μF)
Clock pulse input)	• Output Delay Time Accuracy·········· ± 16% (-40°C ≤ Topt ≤ 105°C)
• Operating Voltage Range (VDD) ······0.9V to 6.0V	(WDT Section)
(VD Section)	• Watchdog Timeout Period (tWD)······ Typ. 310ms (CTW=0.1μF)
• Detector Threshold Range (-VDET) ···1.5V to 5.5V (internally fixed)	• Reset Hold Time of WDT (tWR) ······· Typ. 34ms (CTW=0.1μF)
• Detector Threshold Accuracy ··········± 1%	• Watchdog Timeout Period Accuracy···· ± 33% (-40°C ≤ Topt ≤ 105°C)
• Temp. coeff. of Detector Threshold ···Typ. ± 100ppm/°C	• Package ········································· SOT-23-6

(The above shows specification at Topt=25°C. Design assurance value at -40°C ≤ Topt ≤ 105°C is also available. For details, please refer to the datasheet.)

BLOCK DIAGRAMS

R5105Nxx1A

(Nch. open drain output)

VDD	3
CD	6
	Vref2	Vref1
	2		5	GND
CTW
	WATCHDOG	CLOCK	1	SCK
	TIMER	DETECTOR
RESETB 4

R5105Nxx1C

(CMOS output)

VDD	3
CD	6
	Vref2	Vref1
	2		5	GND
CTW
	WATCHDOG	CLOCK	1	SCK
	TIMER	DETECTOR
RESETB 4

TYPICAL APPLICATION

Power Supply			Microprocessor
			VDD
			R
3 VDD	RESETB	4	RESET

R5105Nxx1A

Series

SCK

1

I/O

CD

6

CD

GND

CTW

2

CTW

5

	SELECTION GUIDE		TIMING CHART

Halogen Free	Package	Q'ty per Reel	Part No.
	SOT-23-6	3,000 pcs	R5105N		1		-TR-FE
				.xx.		.

.xx : Specify the detector threshold within the range of 1.5V (.15.) to 5.5V (.55.) in 0.1V steps.

+VDET

VDD -VDET

. : Select the output type from (.A.) Nch. open drain or (.C.) CMOS.				tPHL	tPHL
PACKAGE (Top View)			VCD	+VTCD
SOT-23-6				-VTCD
6	5	4		tWD	tWDI
				Vref2H
			VCTW
				Vref2L

			1		2		3
	1	SCK	Watchdog timer clock input pin
	2	CTW	Ext. Cap. pin for setting reset and
			watchdog timeout period of WDT
	3	VDD	Power supply pin
	4	RESETB	Output pin for Reset "L" signal
	5	GND	Ground pin
	6	CD	Ext. Cap. pin for setting output
			delay time of VD

tPLH	tPLH
VSCK
	tWR
VRESETB

APPLICATION

• Monitoring of the power system of devices equipped with microprocessors

VTCD : Threshold voltage of CD pin when a power-on reset pulse inverting.Vref2H : CTW pin voltage at the end of WDT timeout period.

Vref2L : CTW pin voltage at the begin of WDT timeout period.tPHL : Output delay time

tWDI : tWD/10 (SCK pulses input during this period are ignored.)

No.EK-159-101001

CMOS Microprocessor Supervisory

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