R5108G SERIES
Microprocessor Supervisory Circuit with SENSE pin
NO.EA-171-151222
OUTLINE
The R5108G is a microprocessor supervisory circuit and has high accuracy and ultra low supply current voltage
detector with built-in delay circuit and watchdog timer. When the SENSE voltage is down across the threshold,
or the watchdog timer does not detect the system clock from the microprocessor, the reset output is generated.
The voltage detector circuit is used for the system reset, etc. The detector threshold is fixed internally, and the
accuracy is
±1.0%.
The released delay time (Power-on Reset Delay) circuit is built-in, and output delay time is
adjustable with an external capacitor, and the accuracy is
±16%
(1)
. When the SENSE voltage becomes the
released voltage, the reset state will be maintained during the delay time. The output type of the reset is
selectable, Nch open-drain, or CMOS.
The time out period of the watchdog timer can be also set with an external capacitor, and the accuracy is
±33%
(1)
.
There is a function to stop supervising clock by the watchdog timer (INH function). A necessary voltage source
can be supervised with SENSE pin. There are another 4 products by the difference of packages and the
function of voltage detector and watchdog timer. The package of R5108G is SSOP-8G.
FEATURES
•
Operating Voltage Range (Maximum Rating) ....................... 1.5V to 6.0V (7.0V)
•
Supply Current ...................................................................... Typ. 11µA
< Voltage Detector Part >
•
Detector Threshold Range .................................................... 1.5V to 5.5V (0.1V steps)
•
Detector Threshold Accuracy ................................................
±1.0%
•
Power-on Reset Delay Time accuracy ..................................
±16%
(1)
(−40°C
≤
Ta
≤
105°C)
•
Power-on reset delay time of the voltage detector ............... Typ. 370ms with an external capacitor : 0.1µF
•
With SENSE pin .................................................................... Able to keep “L” reset signal
< Watchdog Timer Part >
•
Built-in a watchdog timer's time out period accuracy............
±33%
(1)
(−40°C
≤
Ta
≤
105°C)
•
Timeout period for watchdog timer ....................................... Typ. 310ms with an external capacitor : 0.1µF
•
Reset timer for watchdog timer ............................................. Typ. 34ms with an external capacitor : 0.1µF
•
With Inhibit pin (INH) ............................................................. Able to stop watchdog timer
•
Package ................................................................................ SSOP-8G
APPLICATIONS
•
Supervisory circuit for equipment with using microprocessors.
(1)
Accuracy to center value of (Min.+Max.)/2
1
R5108G
NO.EA-171-151222
SELECTION GUIDE
The detector threshold, the output type and the taping type for the ICs can be selected at the users’ request.
The selection can be made with designating the part number as shown below;
Product Name
R5108Gxx1∗-TR-FE
Package
SSOP-8G
Quantity per Reel
3,000 pcs
Pb Free
Yes
Halogen Free
Yes
xx : The detector threshold (-V
DET
) can be designated in the range from 1.5V(15) to 5.5V(55) in 0.1V steps.
∗
: Designation of Output Type
(A) Nch Open Drain
(C) CMOS
Series Selection
R5105N
Package
With INH pin (Inhibit)
2 clock input
With MR pin (Manual Reset)
With SENSE pin
Remarks
No
No
C
D
pin and
C
TW
pin are
combined uses.
No
No
Yes
Yes
No
No
Operating
Supply Current
Voltage Range
11.5µA
1.5V to 6.0V
R5106N
R5107G
Yes
Yes
R5108G
SSOP-8G
R5109G
SOT-23-6
2
R5108G
NO.EA-171-151222
BLOCK DIAGRAMS
R5108Gxx1A
(Nch Open Drain Output)
SENSE
V
DD
V
DD
R5108Gxx1C
(CMOS Output)
SENSE
C
D
Vref2
Vref1
C
D
Vref2
Vref1
C
TW
GND
WATCHDOG
TIMER
CLOCK
DETECTOR
C
TW
GND
WATCHDOG
TIMER
CLOCK
DETECTOR
SCK
SCK
RESETB
INH
RESETB
INH
PIN DESCRIPTIONS
•
SSOP-8G
8 7 6 5
1 2 3 4
Pin No.
1
2
3
4
5
6
7
8
Symbol
RESETB
SENSE
C
D
GND
SCK
INH
C
TW
V
DD
Description
Output Pin for Reset signal of Watchdog timer and Voltage Detector.
(Output "L" at detecting Detector Threshold and Watchdog Timer
Reset.)
Voltage Detector Voltage SENSE Pin (Active "L")
External Capacitor Pin for Setting Delay Time of Voltage Detector
Ground Pin
Clock Input Pin from Microprocessor
Inhibit Pin ("L": Inhibit the watchdog timer)
External Capacitor Pin for Setting Reset and Watchdog Timeout Periods
Power Supply Pin
3
R5108G
NO.EA-171-151222
ABSOLUTE MAXIMUM RATINGS
Symbol
V
DD
V
CD
V
CTW
V
RESETB
V
SCK
V
INH
V
SENSE
I
RESETB
P
D
Tj
T
stg
Output Current
Input Voltage
Output Voltage
Supply Voltage
Voltage of C
D
Pin
Voltage of C
TW
Pin
Voltage of RESETB Pin
Voltage of SCK Pin
Voltage of INH Pin
Voltage of SENSE Pin
Current of RESETB Pin
Power Dissipation
(1)
(SSOP-8G)
Junction Temperature
Storage Temperature Range
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent
damages and may degrade the life time and safety for both device and system using the device in the field.
The functional operation at or over these absolute maximum ratings are not assured.
Item
Rating
−0.3
to 7.0
−0.3
to V
DD
+
0.3
−0.3
to V
DD
+
0.3
−0.3
to 7.0
−0.3
to 7.0
−0.3
to 7.0
−0.3
to 7.0
20
380
−40
to 125
−55
to 125
(Ta=25°C)
Unit
V
V
V
V
V
V
V
mA
mW
°C
°C
RECOMMENDED OPERATING CONDITONS
Symbol
V
IN
Ta
Input Voltage
Operating Temperature Range
RECOMMENDED OPERATING CONDITIONS
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the recommended
operating conditions, even if when they are used over such ratings by momentary electronic noise or surge. And the
semiconductor devices may receive serious damage when they continue to operate over the recommended
operating conditions.
Item
Rating
1.5 to 6.0
−40 to 105
Unit
V
°C
(1)
Refer to
POWER DISSIPATION
for detailed information.
4
R5108G
NO.EA-171-151222
ELECTRICAL CHARACTERISTICS
V
DD
=6.0V,
C
TW
=0.1µF,
C
D
=0.1µF,
In case of Nch Open Drain Output type, the output pin is pulled up with a
resistance of 100kΩ (R5108Gxx1A), unless otherwise noted.
The specification in
is checked and guaranteed by design engineering at −40°C
≤
Ta
≤
105°C.
R5108Gxx1A/C
Symbol
I
SS
Item
Supply Current
Conditions
V
DD
=
-V
DET
+0.5V,
Clock pulse input
Min.
Typ.
11
Max.
15
(Ta
=
25°C)
Unit
µA
VD Part
Symbol
-V
DET
∆-V
DET
/∆Ta
Item
Detector Threshold
Detector Threshold
Temperature Coefficient
Detector Threshold
Hysteresis
Output Delay Time
Output Current
(RESETB Output pin)
Minimum Operating
Voltage
Conditions
V
DD
=5V,
Ta=25°C
SENSE pin
Threshold
−40°C≤Ta≤105°C
−40°C≤Ta≤105°C
Min.
×0.990
×0.972
Typ.
Max.
×1.010
×1.015
Unit
V
ppm
/°C
±100
V
HYS
t
PLH
I
RESETB
-V
DET
×0.03
C
D
=0.1µF
(1)
Nch
Pch
(2)
V
DD
=1.2V
V
DS
=0.1V
340
0.38
0.65
-V
DET
×0.05
370
0.8
0.9
0.6
-V
DET
×0.07
467
V
ms
mA
mA
V
DDL
V
DD
=6.0V
V
DS
=0.5V
RESETB
<
0.1V, pull-
=
up=100kΩ
0.9
V
•
WDT Part
Item
Watchdog Timeout period
Reset Hold Time of WDT
SCK Input "H"
SCK Input "L"
INH Input "H"
INH Input "L"
INH pull-up Resistance
SCK Input Pulse Width
V
SCKL
=V
DD
×0.2
V
SCKH
=V
DD
×0.8
Conditions
C
TW
=0.1µF
(1)
C
TW
=0.1µF
(1)
Min.
230
29
V
DD
×0.8
0
1.0
0
60
500
110
Typ.
310
34
Max.
450
48
6.0
V
DD
×0.2
6.0
0.35
164
Unit
ms
ms
V
V
V
V
kΩ
ns
t
WD
t
WR
V
SCKH
V
SCKL
V
INHH
V
INHL
R
INH
t
SCKW
Symbol
All test items listed under
Electrical Characteristics
are done under the pulse load condition (Tj ≈ Ta = 25°C) except for
Detector Threshold Temperature Coefficient.
(1)
(2)
The specification does not contain the temperature characteristics of the external capacitor.
In case of CMOS type (R5108Gxx1C)
5
