R5109G Series
Watchdog Timer Equipped with 2-Clock Monitoring with VD
The R5109G Series are CMOS-based system power ICs with a voltage detector (VD) and watchdog timer (WDT) integrated in a single chip.
R5109G 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 by an external capacitor with
a high degree of accuracy. R5109G is equipped with the function that inhibits clock monitoring of the WDT (INH) and the function to
supervise two different clocks.
FEATURES
•
Supply Current (I
SS
) ························ Typ. 11.5μA (V
DD
=-V
DET
+0.5V,
•
Operating Voltage Range (V
DD
) ······ 0.9V to 6.0V
Clock pulse input)
(VD Section)
•
Detector Threshold Range (-V
DET
)····· 1.5V to 5.5V (internally fixed)
•
Detector Threshold Accuracy ·········
±
1%
•
Temp. coeff. of Detector Threshold ··· Typ.
±
100ppm/°C
•
Output Delay Time (t
PLH
)················· Typ. 370ms (C
D
=0.1μF)
•
Output Delay Time Accuracy ··········
±
16% (-40°C
≤
Topt
≤
105°C)
(WDT Section)
•
Watchdog Timeout Period (t
WD
) ······ Typ. 310ms (C
TW
=0.1μF)
•
Reset Hold Time of WDT (t
WR
) ······· Typ. 34ms (C
TW
=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
R5109Gxx1A
(Nch. open drain output)
V
DD
V
DD
TYPICAL APPLICATION
R5109Gxx1C
(CMOS output)
Power Supply
R
Microprocessor 1
V
DD
RESET
I/O
Microprocessor 2
C
TW
V
DD
RESET
I/O
8
V
DD
C
D
Vref2
Vref1
RESETB
1
R5109Gxx1A
Series
SCK2
6
GND
C
TW
7
SCK1
5
C
D
Vref2
Vref1
2
INH
GND
GND
C
TW
WATCHDOG
TIMER
CLOCK
DETECTOR
CLOCK
DETECTOR
C
TW
SCK1
SCK2
WATCHDOG
TIMER
CLOCK
DETECTOR
CLOCK
DETECTOR
3
C
D
SCK1
SCK2
SW
C
D
4
RESETB
INH
RESETB
INH
SELECTION GUIDE
Halogen Free
Package
SSOP-8G
Q'ty per Reel
3,000 pcs
Part No.
R5109G
.xx.1.
∗
-TR-FE
TIMING CHART
V
DD
+V
DET
-V
DET
.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.
V
INH
PACKAGE (Top View)
SSOP-8G
8 7 6 5
+V
TCD
V
CD
-V
TCD
t
WD
t
PHL
t
PHL
t
PHL
t
WDI
V
ref2H
V
CTW
V
ref2L
1
2
3
4
V
SCK1
1
2
3
4
5
6
7
8
RESETB
INH
C
D
GND
SCK1
SCK2
C
TW
V
DD
Output pin for Reset "L" signal
Inhibit pin
Ext. Cap. pin for setting output
delay time of VD
Ground pin
Watchdog timer clock input pin 1
Watchdog timer clock input pin 2
Ext. Cap. pin for setting reset and
watchdog timeout period of WDT
Power supply pin
V
SCK2
t
PLH
t
WR
t
PLH
t
PLH
V
RESETB
APPLICATION
•
Monitoring of the power system of devices equipped with microprocessors
No.EK-172-111001
∗V
TCD
∗V
ref2H
∗V
ref2L
∗t
PHL
∗t
WDI
: Threshold voltage of C
D
pin when a power-on reset pulse inverting.
: C
TW
pin voltage at the end of WDT timeout period.
: C
TW
pin voltage at the begin of WDT timeout period.
: Output delay time
: t
WD
/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. The technical information described in this document shows typical characteristics of and
example application circuits for the products. The release of such information is not to be
construed as a warranty of or a grant of license under Ricoh's or any third party's intellectual
property rights or any other rights.
5. The products listed in this document are intended and designed for use as general electronic
components in standard applications (office equipment, telecommunication equipment,
measuring instruments, consumer electronic products, amusement equipment etc.). Those
customers intending to use a product in an application requiring extreme quality and reliability,
for example, in a highly specific application where the failure or misoperation of the product
could result in human injury or death (aircraft, spacevehicle, nuclear reactor control system,
traffic control system, automotive and transportation equipment, combustion equipment, safety
devices, life support system etc.) should first contact us.
6. We are making our continuous effort to improve the quality and reliability of our products, but
semiconductor products are likely to fail with certain probability. In order to prevent any injury to
persons or damages to property resulting from such failure, customers should be careful enough
to incorporate safety measures in their design, such as redundancy feature, firecontainment
feature and fail-safe feature. We do not assume any liability or responsibility for any loss or
damage arising from misuse or inappropriate use of the products.
7. Anti-radiation design is not implemented in the products described in this document.
8. Please contact Ricoh sales representatives should you have any questions or comments
concerning the products or the technical information.
RICOH COMPANY., LTD.
Electronic Devices Company
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presented with the Japan Management Quality Award for 1999.
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