Low Voltage Detector with Built-in
Delay Circuit
R3130N/R3131N SERIES
OUTLINE
NO. EA-073-0311
R3130N/R3131N Series are CMOS-based low voltage detector ICs with built-in delay circuit, high Detector
Threshold accuracy and ultra low supply current which can be operated at low voltage.
These ICs can be used as system reset generator, and each of these ICs consists of a voltage reference, a
comparator, resistors for setting voltage detector threshold, an output driver transistor, and an output delay
generator.
Detector threshold is fixed internally with high accuracy and requires no adjustment. When Supply Voltage
crosses a setting detector threshold voltage from a high value to a lower value, this IC generates reset signal.
R3130N Series output “L” at detection mode, while R3131N Series output “H”.
Further, each of R3130N/R3131N Series embeds an output delay generator, when Supply Voltage crosses a
setting detector threshold voltage from a low value to a higher value, during a setting delay time which is fixed in
the IC, this IC keeps the reset condition.
Output Delay Time can be selected. (Typ. 240ms is standard.)
Two output types, Nch open drain type and CMOS type, are available.
Since the package for these ICs is SOT23-3 (Mini-mold) package, high density mounting of the ICs on board
is possible.
FEATURES
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Pin to Pin compatible with MAX 809/810 (R3130Nxxxx: MAX 809, R3131Nxxxx: MAX 810)
Ultra-low supply Current ................................................... Typ. 1.25µA (R313xN27xx: V
DD
=3.0V)
Operating Voltage Range .................................................. 1.0V to 6.0V (Topt=25°C)
Detector Threshold ............................................................. Setting with a step of 0.1V in the range of 1.6V to
4.8V is possible.
Embedded Power on Reset Delay Time Circuit ................ Delay Time can be designated.
Refer to Selection Guide.
High Accuracy Detector Threshold .....................................
±1.5%
High Accuracy Output Delay Time ......................................
±10.0%
Low Temperature-Drift Coefficient of Detector Threshold .. Typ.
±100ppm/°C
Two Output Types ............................................................... Nch Open Drain and CMOS
Small Package .................................................................... SOT-23-3
APPLICATIONS
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CPU & Logic Circuit Reset
Battery Checker
Window Comparator
Wave Shaping Circuit
Battery Back-Up Circuit
Power Failure Detector
1
R3130N/R3131N
BLOCK DIAGRAMS
R3130NxxxA
Nch Open Drain Output
V
DD
V
DD
R3130NxxxC
CMOS Output
-
+
Vref
GND
Delay
Circuit
-
OUT
+
Vref
GND
Delay
Circuit
OUT
R3131NxxxA
Nch Open Drain Output
V
DD
R3131NxxxC
CMOS Output
V
DD
-
+
Vref
GND
Delay
Circuit
-
OUT
+
Vref
GND
Delay
Circuit
OUT
2
R3130N/R3131N
TIMING CHART
Supply
Voltage
(V
DD
)
Detector
Threshold
V
DET
Minimum Operating
Voltage
V
SS
Supply
Voltage
(V
DD
)
Detector
Threshold
V
DET
Minimum Operating
Voltage
V
SS
Output Voltage
V
SS
Tdelay
Output Voltage
V
SS
Tdelay
R3130N Operation Diagram
R3131N Operation Diagram
•
Output Delay Operation
Output Delay Time, or Tdelay is specified as follows:
1. In the case of Nch open drain output:
The time interval from rising edge of V
DD
pulse (1.0V→(V
DET
)+1.0V) to the time at which the output reaches
2.5V under the condition that the output pin (OUT) is pulled up to 5V through a 470kΩ resistor.
2. In the case of CMOS output
The time interval from rising edge of V
DD
pulse (1.0V→(V
DET
)+1.0V) to the time at which the output reaches
V
DD
/2.
V
DET
+1.0V
Input Voltage
(V
DD
)
V
DET
+1.0V
Input Voltage
(V
DD
)
1.0V
GND
1.0V
GND
5.0V
V
DET
+1.0V
Output Voltage
Output Voltage
2.5V
(V
DET
+1.0V)/2
GND
Trst
Tdelay
GND
Trst
Tdelay
Nch Open Drain Output
CMOS Output
3
R3130N/R3131N
SELECTION GUIDE
The detector threshold , the output type, and Output delay time of R3130N/R3131N series can be designated
at the user’s request by specifying the part number as follows:
R3130Nxxxx(x)-TR
R3131Nxxxx(x)-TR
↑ ↑↑ ↑
a bc d
Code
a
↑
e
←Part
Number
←Part
Number
Contents
Setting Detector Threshold (V
DET
)
Stepwise setting with a step of 0.1V in the range of 1.6V to 4.8V is possible.
The following 4 kinds of voltage are also standard.
2.63V, 2.93V, 3.08V, 4.65V
Selection of Output Delay Time
E: 240ms (Standard) A: 50ms B: 100ms D: 200ms H: 400ms
∗A,
B, D, H versions can be produced only for 6 kinds of standard voltage items.
Designation Output type
A: Nch Open Drain
C: CMOS
Description of last one digit of 4 kinds of standard voltage items.
Designation of Taping Direction (Refer to Taping Specification)
b
c
d
e
PIN CONFIGURATION
SOT-23-3
3
MARK SIDE
1
2
PIN DESCRIPTION
Pin No
1
2
3
Symbol
GND
OUT
V
DD
Ground Pin
Output Pin
R3130N: Output “L” at detection mode, Output “H” at release mode
R3131N: Output “H” at detection mode, Output “L” at release mode
Input Pin
Description
4
R3130N/R3131N
ABSOLUTE MAXIMUM RATINGS
Symbol
V
DD
V
OUT
I
OUT
P
D
Topt
Tstg
Tsolder
Supply Voltage
Output Voltage
Output Current
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Soldering Temperature
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are threshold limit values that must not be exceeded even for a moment under
any conditions.
Moreover, such values for any items must not be reached simultaneously. Operation above these absolute
maximum ratings may cause degradation or permanent damage to the device. These are just stress ratings
and do not necessarily imply to guarantee operation below these limits.
CMOS
Nch
Item
Rating
6.5
V
SS
−0.3
to V
DD
+0.3
V
SS
−0.3
to 6.5
20
150
−40
to
+85
−55
to
+125
260°C, 10s
Unit
V
V
V
mA
mW
°C
°C
ELECTRICAL CHARACTERISTICS
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R3130N26xx3-TR
[Topt=25°C]
Symbol
V
DDH
V
DDL
∗
1
V
DET
I
SS1
I
SS2
I
SS3
V
OH
V
OL
∆V
DET
/
∆Topt
Item
Maximum Operating Voltage
Minimum Operating Voltage
Detector Threshold
Supply Current1
Supply Current2
Supply Current3
“H” Output Voltage
“L” Output Voltage
Detector Threshold
Temperature Coefficient
Conditions
Min.
Typ.
Max.
6.0
Unit
V
V
V
µA
µA
µA
V
V
I
OL
=50µA
2.591
V
DD
=6.00V
V
DD
=2.73V
V
DD
=2.53V
V
DD
=2.73V,
I
OUT
=−500µA
V
DD
=2.53V,
I
OUT
=1.2Ma
0.8×V
DD
0.75
2.630
1.40
1.25
1.10
0.93×V
DD
0.16
1.00
2.669
5.00
4.00
3.50
0.30
Tdelay
∗
2
Output Delay Time for release Refer to electrical characteristics by Output Delay Time for release
−40°C
<
=
Topt
<
=
85°C
±100
ppm/°C
5
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