Microprocessor Supervisory Circuit
R5108G SERIES
OUTLINE
NO. EA-171-080602
The R5108G Series are CMOS-based µ con supervisory circuit, or high accuracy and ultra low supply current
voltage detector with built-in delay and watchdog timer. When the SENSE voltage is down across the threshold,
or the watchdog timer does not detect the system clock from the
µ
con, the reset output is generated. The
voltage detector circuit is used for the system reset, etc. The detector threshold is fixed internally, and the
tolerance 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. When the sense voltage becomes the released voltage, the reset state will
be maintained during the delay time. The time out period of the watchdog timer can be also set with an external
capacitor. The output type of the reset is selectable, Nch open-drain, or CMOS. There is a function to stop
supervising clock by the watchdog timer (INH function). A necessary voltage source can be supervised with
SENSE pin. The package is small SSOP-8G.
FEATURES
•
Built-in a watchdog timer's time out period accuracy
±30%
•
Timeout period for watchdog and generating a reset signal can be set by an external capacitor
•
Detector Threshold Voltage ····························· 0.1V stepwise setting in the range from 1.5V to 5.5V
•
Supply current ·················································· Typ. 11µA
•
Operating Voltage ············································ 1.5V to 6.0V
•
High Accuracy Output Voltage of Detector Threshold ·············································
±1.0%
•
Power-on Reset Delay Time accuracy·············
±20%
•
Power-on reset delay time of the voltage detector can be set with an external capacitor.
•
Small Package ················································· SSOP-8G (0.65mm pitch)
APPLICATION
•
Supervisory circuit for equipment with using microprocessors.
1
R5108G
SELECTION GUIDE
The selection can be made with designating the part number as shown below:
R5108Gxx1x-TR
↑ ↑↑ ↑
a bcd
Code
a
b
c
d
Descriptions
Designation of Package Type;
G: SSOP8G (2.9mmx4.0mm)
Designation of Detector Threshold Voltage (-V
DET
)
0.1V stepwise setting is possible in the range from 1.5V to 5.5V
Designation of the output type of RESETB
A: Nch Open-drain
C: CMOS Output
Designation of Taping Type
←part
Number
PIN CONFIGURATION
RESETB
SENSE
CD
GND
SSOP8G (0.65mm pitch)
1
2
3
R5108GxxxA
R5108GxxxC
8
7
6
VDD
TW
INH
SCK
PIN DESCRIPTION
Pin No
1
2
3
4
5
6
7
8
Symbol
RESETB
SENSE
C
D
GND
SCK
INH
TW
V
DD
Pin 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
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
ABSOLUTE MAXIMUM RATINGS
Topt=25°C, V
SS
=0V
Symbol
V
IN
V
CD
V
TW
V
RESETB
V
SCK
V
INH
V
SENSE
I
RESETB
P
D
Topt
Tstg
Output Current
Power Dissipation
Input Voltage
Output Voltage
Supply Voltage
Item
Voltage of C
D
Pin
Voltage of TW Pin
Voltage of RESETB Pin
Voltage of SCK Pin
Voltage of INH Pin
Voltage of SENSE Pin
Current of RESETB Pin
Rating
-0.3∼7.0
-0.3∼V
IN
+0.3
-0.3∼V
IN
+0.3
-0.3∼7.0
-0.3∼7.0
-0.3∼7.0
-0.3∼7.0
20
300
-40∼+105
-55∼+125
Unit
V
V
V
V
V
V
V
mA
mW
°C
°C
Operating Temperature Range
Storage Temperature Range
ELECTRICAL CHARACTERISTICS
R5108GxxxA/C
Symbol
V
IN
Iss
Unless otherwise specified, V
IN
=6.0V, C
TW
=0.1uF, C
D
=0.1uF, Rpull-up=100kΩ,
Topt=25°C
Item
Operating Voltage
Supply Current
V
IN
=(-V
DET
)+0.5V
Clock Pulse Input
Voltage Detector
SENSE pin Threshold
-40°C≤Topt≤105°C
x0.990
x0.972
±100
(-V
DET
)
(-V
DET
)
(-V
DET
)x
x0.03
0.07
x0.05
340
467
370
0.6
0.38
0.65
0.80
0.90
0.9
Conditions
Min.
1.5
11
Typ.
Max.
6.0
15
x1.010
x1.015
Unit
V
µA
The number of Bold font applied to the temperature range from -40°C to 105°C
-V
DET
∆-V
DET
/
∆Topt
V
HYS
tp
LH
V
INL
I
DOUTN
I
DOUTP
Detector Threshold
Detector Threshold
Temperature Coefficient
Detector Threshold
Hysteresis
Output Delay Time
Minimum Operating Voltage
Output Current (RESETB
Output pin)
Output Current (RESETB
Output pin)
Watchdog Timeout period
Reset Hold Time of WDT
SCK Input "H"
SCK Input "L"
INH Input "H"
V
ppm/
°C
V
ms
V
mA
mA
C
D
=0.1µF
RESETB≤0.1V,
pull-up=100kΩ
Nch, V
DD
=1.2V, V
DS
=0.1V
Nch, V
DD
=6.0V,
V
DS
=0.5V(R5108GxxxC)
Watchdog Timer
C
TW
=0.1uF
C
TW
=0.1uF
T
WD
T
WR
V
SCKH
V
SCKL
V
INHH
4
230
29
V
IN
x0.8
0.0
1.0
310
34
450
48
6.0
V
IN
x0.2
6.0
ms
ms
V
V
V
Embedded System
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