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参数资料
| 型号： | R5108G311A-TR-F |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封装： | ROHS COMPLIANT, SSOP-8 |
| 文件页数： | 1/2页 |
| 文件大小： | 228K |
| 代理商： | R5108G311A-TR-F |
R5108G Series
Watchdog Timer Equipped with SENSE Pin with VD
No.EK-171-091101
CMOS Microprocessor Supervisory
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 (I
SS
) Typ. 11
μA (VDD=-VDET+0.5V,
Clock pulse input)
Operating Voltage Range (V
DD
) 1.5V to 6.0V
(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 (CD=0.1
μF)
Output Delay Time Accuracy± 16% (-40°C <= Topt <= 105°C)
(WDT Section)
Watchdog Timeout Period (t
WD
) Typ. 310ms (CTW=0.1
μF)
Reset Hold Time of WDT (t
WR
) Typ. 34ms (CTW=0.1
μF)
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
(Nch. open drain output)
VDD
GND
SCK
CTW
WATCHDOG
TIMER
CLOCK
DETECTOR
RESETB
INH
SENSE
CD
Vref1
Vref2
R5108Gxx1C
(CMOS output)
VDD
GND
SCK
CTW
WATCHDOG
TIMER
CLOCK
DETECTOR
RESETB
INH
SENSE
CD
Vref1
Vref2
R5108Gxx1A
Series
CD
VDD
RESET
I/O
R
CTW
GND
VDD
CD
RESETB
SCK
CTW
8
3
4
7
1
5
Microprocessor
Power Supply
SW
2
6
SENSE
INH
SELECTION GUIDE
Package
Quantity per Reel
Part No.
SSOP-8G
3,000 pcs
R5108G.xx.1.
-TR-F
.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.
PACKAGE (Top View)
TIMING CHART
SSOP-8G
1
8
2
7
3
6
4
5
1
RESETB
Output pin for Reset "L" signal
2
SENSE
Voltage SENSE pin of VD
3
CD
Ext. Cap. pin for setting output
delay time of VD
4
GND
Ground pin
5
SCK
Watchdog timer clock input pin
6
INH
Inhibit pin
7
CTW
Ext. Cap. pin for setting reset and
watchdog timeout period of WDT
8
VDD
Power supply pin
APPLICATION
Monitoring of the power system of devices equipped with microprocessors
-VDET
+VDET
VRESETB
VCTW
VSCK
VSENSE
Vref2H
Vref2L
+VTCD
VINH
tPLH
tWD
tPLH
tWR
tPLH
tWDI
VDD
- VTCD
tPHL
VCD
tPHL : Output delay time
tWDI : tWD/10 (SCK pulses input during this period are ignored.)
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