R5105N SERIES
Microprocessor Supervisory Circuit
NO.EA-159-080808
OUTLINE
The R5105N Series are CMOS-based microprocessor supervisory circuit, or high accuracy and ultra low
supply current voltage detector with built-in delay circuit and watchdog timer. When the supply 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%*. When the supply voltage becomes higher
than 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%*.
There are another 4 products by the difference of packages and the function of voltage detector and
watchdog timer. The package of R5105N is SOT-23-6.
FEATURES
•
Supply Current...................................................................... Typ. 11µA
•
Operating Voltage Range ..................................................... 0.9V to 6.0V
< Voltage Detector Part >
•
Detector Threshold Range.................................................... Stepwise setting with a step of 0.1V in the
range of 1.5V to 5.5V
•
Detector Threshold Accuracy................................................
±1.0%
•
Power-on Reset Delay Time accuracy .................................
±16%*
(-40°C
<
T
opt
<
105°C)
=
=
•
Power-on reset delay time of the voltage detector ............... Typ. 370ms with an external capacitor : 0.1µF
< Watchdog Timer Part >
•
Built-in a watchdog timer's time out period accuracy ........... ±33%* (-40°C
<
T
opt
<
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
•
Package................................................................................ SOT-23-6
*) Accuracy to center value of (Min.+Max.)/2
APPLICATIONS
•
Supervisory circuit for equipment with using microprocessors.
1
R5105N
BLOCK DIAGRAMS
Nch Open Drain Output (R5105Nxx1A)
V
DD
3
C
D
6
Vref2
CMOS Output (R5105Nxx1C)
V
DD
3
C
D
6
Vref2
Vref1
C
TW
2
WATCHDOG
TIMER
CLOCK
DETECTOR
5 GND
1 SCK
Vref1
C
TW
2
WATCHDOG
TIMER
CLOCK
DETECTOR
5 GND
1 SCK
RESETB 4
RESETB 4
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;
R5105Nxx1x-xx-x
←
Part Number
↑↑
a b
Code
a
Designation of Package Type;
N: SOT-23-6
Setting Detector Threshold (-V
DET
);
Stepwise setting with a step of 0.1V in the range of 1.5V to 5.5V is possible.
Designation of Output Type;
A: Nch Open Drain
C: CMOS
Designation of Taping Type ;
TR (Refer to Taping Specifications; TR type is the standard direction.)
Designation of Composition of pin plating
-F: Lead free solder plating (SOT-23-6)
↑ ↑ ↑
c d e
Contents
b
c
d
e
2
R5105N
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
PIN CONFIGURATION
•
SOT-23-6
6
5
4
(mark side)
1
2
3
PIN DESCRIPTIONS
•
SOT-23-6
Pin No.
1
2
3
4
5
6
Symbol
SCK
C
TW
V
DD
RESETB
GND
C
D
Description
Clock Input Pin from Microprocessor
External Capacitor Pin for setting Reset and Watchdog Timer
Timeout Period
Power supply Pin
Output Pin for Reset signal of Watchdog timer and Voltage Detector.
(Output "L" at detecting Detector Threshold and Watchdog Timer
Reset.)
Ground Pin
External Capacitor Pin for Setting delay time of Voltage Detector
3
R5105N
ABSOLUTE MAXIMUM RATINGS
Symbol
V
DD
V
CD
V
CTW
V
RESETB
V
SCK
I
RESETB
P
D
Topt
Tstg
Input Voltage
Output Current
Output Voltage
Supply Voltage
Voltage of C
D
Pin
Voltage of C
TW
Pin
Voltage of RESETB Pin
Voltage of SCK Pin
Current of RESETB Pin
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
20
420
-40 to 105
-55 to 125
Topt=25°C
Unit
V
V
V
V
V
mA
mW
°C
°C
Power Dissipation (SOT-23-6)*
Operating Temperature Range
Storage Temperature Range
* ) For Power Dissipation, please refer to PACKAGE INFORMATION to be described.
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 is not assured.
4
R5105N
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 (R5105Nxx1A), unless otherwise noted.
The specification in
is checked and guaranteed by design engineering at
−40°C
<
T
opt
<
105°C.
=
=
•
R5105Nxx1A/C
Item
Operating Voltage
Supply Current
V
DD
=
-V
DET
+0.5V,
Clock pulse input
Conditions
Min.
0.9
11
Typ.
Max.
6.0
15
V
DD
I
SS
Topt=25°C
Symbol
Unit
V
µA
•
VD Part
Item
Detector Threshold
Detector Threshold Hysteresis
−40°C
<
=
Symbol
-V
DET
Conditions
T
opt
=25°C
−40°C
<
=
Min.
×0.990
Typ.
Max.
×1.010
×1.015
Unit
V
V
ppm/°C
T
opt
<
=
105°C
×0.972
-V
DET
×0.03
-V
DET
×0.05
±100
340
370
0.8
0.9
V
HYS
-V
DET
×0.07
∆-V
DET
/ Detector Threshold
∆T
opt
Temperature Coefficient
t
PLH
Output Delay Time
Output Current
(RESETB Output pin)
T
opt
<
=
105°C
C
D
=0.1µF *
1
Nch
Pch *
2
V
DD
=1.2V
V
DS
=0.1V
V
DD
=6.0V
V
DS
=0.5V
Conditions
C
TW
=0.1µF
*
1
C
TW
=0.1µF
*
1
467
ms
mA
mA
0.38
0.65
I
RESETB
•
WDT Part
Item
Watchdog Timeout period
Reset Hold Time of WDT
SCK Input "H"
SCK Input "L"
SCK Input Pulse Width
V
SCKL
=V
DD
×0.2
V
SCKH
=V
DD
×0.8
Min.
230
29
V
DD
×0.8
0
500
Typ.
310
34
Max.
450
48
6.0
V
DD
×0.2
Unit
ms
ms
V
V
ns
t
WD
t
WR
V
SCKH
V
SCKL
t
SCKW
Symbol
All of unit are tested and specified under load conditions such that T
opt
=25°C
except for Detector Threshold
Temperature Coefficient.
*1) The specification does not contain the temperature characteristics of the external capacitor.
*2) In case of CMOS type (R5105Nxx1C)
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)
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 conditions by momentary electronic noise or surge.
And the semiconductor devices may receive serious damage when they continue to operate over the
recommended operating conditions.
5
