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NO. EA-073-0012
Low Voltage Detector with built-in
Delay Circuit
R3130NA/C, R3131NA/C
APPLICATION MANUAL
Low Voltage Detector with built-in
Delay Circuit
R3130NA/C, R3131NA/C
1
OUTLINE
R3130N/R3131N Series are low voltage detector ICs with built-in delay circuit, high Detector Threshold accuracy
and ultra low supply current by CMOS process, 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 com-
parator, 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 are SOT23-3 (Mini-mold) package, high density mounting of the ICs on board is
possible.
FEATURES
Pin to Pin compatible with MAX 809/810 (R3130N: MAX 809, R3131N: MAX 810)
Ultra-low supply Current ........................................................ TYP. 1.25A (R313N27: V
DD
=3.0V)
Operating Voltage Range ........................................................ 1.0V to 6.0V (Topt=25C)
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
R3130NA/C, R3131NA/C
2
APPLICATIONS
CPU & Logic Circuit Reset
Battery Checker
Window Comparator
Wave Shaping Circuit
Battery Back-Up Circuit
Power Failure Detector
BLOCK DIAGRAMS
R3130N
A
R3130N
C
Nch Open Drain Output
CMOS Output
V
DD
GND
OUT
Delay
Circuit
Vref
-
+
V
DD
GND
OUT
Delay
Circuit
Vref
-
+
R3131N
A
R3131N
C
Nch Open Drain Output
CMOS Output
OUT
Delay
Circuit
-
+
V
DD
GND
Vref
GND
OUT
Delay
Circuit
Vref
-
+
V
DD
R3130NA/C, R3131NA/C
3
TIMING CHART
V
SS
Tdelay
Supply
Voltage
(V
DD
)
Output Voltage
Detector
Threshold
Minimum Operating
Voltage
V
DET
V
SS
V
SS
Tdelay
Supply
Voltage
(V
DD
)
Output Voltage
Detector
Threshold
Minimum Operating
Voltage
V
DET
V
SS
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
)+0.1V) 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 470k resistor.
2. In the case of CMOS Output
The time interval from rising edge of V
DD
pulse (1.0V(V
DET
)+0.1V) to the time at which the output reaches
V
DD
/2.
V
DET
+1.0V
Input Voltage
Output Voltage
1.0V
5.0V
2.5V
GND
GND
Trst
Tdelay
(V
DD
)
V
DET
+1.0V
Input Voltage
Output Voltage
1.0V
V
DET
+0.1V
(V
DET
+0.1V)/2
GND
GND
Trst
Tdelay
(V
DD
)
Nch Open Drain Output
CMOS Output
R3130NA/C, R3131NA/C
4
SELECTION GUIDE
The detector threshold , the output type, and Output delay time of R3130N series can be designated at the user's
request by specifying the part number as follows:
R3130N-TR Part Number
R3131N-TR Part Number
a bcd e
Code
Contents
a
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 6 kinds of voltage are also standard.
2.63V, 2.93V, 3.08V, 4.00V, 4.40V, 4.65V
b
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.
c
Designation Output type
A: Nch Open Drain
C: CMOS
d
Description of last one digit of 6 kinds of standard voltage items.
e
Designation of Taping Direction
(Refer to Taping Specification)
PIN CONFIGURATION
SOT-23-3
MARK SIDE
3
1
2