R5108G431A-TR-F [RICOH]

Power Supply Management Circuit, Fixed, 1 Channel, CMOS, PDSO8, ROHS COMPLIANT, SSOP-8;


型号：	R5108G431A-TR-F
厂家：	RICOH ELECTRONICS DEVICES DIVISION
描述：	Power Supply Management Circuit, Fixed, 1 Channel, CMOS, PDSO8, ROHS COMPLIANT, SSOP-8 光电二极管
文件：	总2页 (文件大小：228K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

R5108G Series

Watchdog Timer Equipped with SENSE Pin with VD

The R5108G Series are CMOS-based system power ICs with a voltage detector (VD) and watchdog timer (WDT) integrated in a single chip.

R5108G monitors the power system of devices equipped with microprocessors and prevents system runaway with a reset signal when a

malfunction occurs. R5108G is equipped with the function that inhibits clock monitoring of the WDT (INH). Since R5108G has a SENSE pin

for monitoring voltage separately from the power pin, its reset signal does not become unstable as long as power supply is secured and

the "L" can be maintained.

FEATURES

• Supply Current (ISS) ························Typ. 11μA (VDD=-VDET+0.5V,

Clock pulse input)

• Operating Voltage Range (VDD) ······1.5V to 6.0V

(VD Section)

• Output Delay Time (tPLH)·················Typ. 370ms (CD=0.1μF)

• Output Delay Time Accuracy··········± 16% (-40°C Topt 105°C)

(WDT Section)

• Watchdog Timeout Period (tWD)······Typ. 310ms (CTW=0.1μF)

•

Detector Threshold Range (-VDET

Detector Threshold Accuracy ··········± 1%

Temp. coeff. of Detector Threshold ···Typ. ± 100ppm/°C

)

···1.5V to 5.5V (internally fixed)

• Reset Hold Time of WDT (tWR) ·······Typ. 34ms (CTW=0.1μF)

•

Watchdog Timeout Period Accuracy ····± 33% (-40°C Topt 105°C)

• Package ·········································SSOP-8G

(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

TYPICAL APPLICATION

R5108Gxx1A

R5108Gxx1C

(Nch. open drain output)

(CMOS output)

Power Supply

Microprocessor

VDD

SENSE

VDD

V^DD

RESETB

RESET

I/O

SENSE

Vref2

Vref1

Vref2

Vref1

R5108Gxx1A

SCK

C^TW

GND

SCK

GND

SCK

Series

INH

CTW

WATCHDOG

TIMER

CLOCK

DETECTOR

WATCHDOG

TIMER

CLOCK

DETECTOR

GND

CTW

RESETB

INH

SELECTION GUIDE

xx.

Specify the detector threshold within the range 1.5V (

in 0.1V steps.

) to 5.5V (

)

Package

Quantity per Reel

Part No.

SSOP-8G

3,000 pcs

R5108G

xx.

∗-TR-F

: Select the output type from (

) Nch. open drain or (

) CMOS.

∗

PACKAGE (Top View)

TIMING CHART

SSOP-8G

VDD

INH

+V^DET

-VDET

SENSE

RESETB Output pin for Reset "L" signal

SENSE Voltage SENSE pin of VD

PLH

tPLH

+VTCD

- V^TCD

Ext. Cap. pin for setting output

delay time of VD

tWDI

ref2H

GND

SCK

INH

Ground pin

Watchdog timer clock input pin

Inhibit pin

CTW

ref2L

PHL

tWR

Ext. Cap. pin for setting reset and

watchdog timeout period of WDT

Power supply pin

SCK

PLH

VDD

RESETB

APPLICATION

∗tPHL : Output delay time

∗t^WDI: tWD/10 (SCK pulses input during this period are ignored.)

• Monitoring of the power system of devices equipped with microprocessors

No.EK-171-091101

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

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example application circuits for the products. The release of such information is not to be

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for example, in a highly speciﬁc application where the failure or misoperation of the product

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concerning the products or the technical information.

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■

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