LOW VOLTAGE DETECTOR WITH OUTPUT DELAY
R3112xxx1A/C Series
2001. Apr. 4
Rev. 1.10 - 1 -
s
OUTLINE
The R3112 Series are voltage detector ICs with high detector threshold accuracy and ultra-low
supply current by CMOS process, which can be operated at an extremely low voltage and is used for
system reset as an example.
Each of these ICs consists of a voltage reference unit, a comparator, resistor net for detector
threshold setting, an output driver, a hysteresis circuit, and an output delay circuit. The detector
threshold is fixed with high accuracy internally and does not require any adjustment. Two output types,
Nch open drain type and CMOS type are available.
Two types of packages, SOT-23-5 and ultra small SC-82AB can be selected so that high density
mounting on boards is possible.
s
FEATURES
q
Built-in Output Delay Circuit
TYP. 100ms with an external capacitor: 0.022
F
q
Ultra-low Supply Current
TYP. 1.0A (V
DD
=3.5V)
q
Wide Range of Operating Voltage
0.7
6.0V(Topt=25
C)
q
Detector Threshold
Stepwise setting with a step of 0.1V in the range of 0.9V to 5.0V
is possible.
q
High Accuracy Detector Threshold
2.0%
q
Low Temperature-Drift Coefficient of Detector Threshold
TYP. 100ppm/
C
q
Two Output Types
Nch Open Drain and CMOS
q
Two Types of Packages
SOT-23-5 (Mini-mold), SC-82AB
s
s
s
s
APPLICATIONS
CPU and Logic Circuit Reset
Battery Checker
Window Comparator
Wave Shaping Circuit
Battery Back-up Circuit
Power Failure Detector
s
BLOCK DIAGRAMS
R3112XXX1A R3112XXX1C
V
DD
Vref
OUT
GND
C
D
+
-
R
D
Vref
V
DD
OUT
GND
C
D
+
--
R
D
Rev. 1.10 - 2 -
s
s
s
s
OPERATION
OUT
Vref
V
DD
GND
C
D
+
-
Pch
Nch
Schmitt Trigger
Comparator
Ra
Rb
Rc
Tr.1
Tr.2
R
D
Output Capacitor
Current Source
Fig. 1 Block Diagram with an external capacitor
Output Voltage
(OUT)
Supply Voltage
(VDD)
HYSTERESIS RANGE
A
B
Released Voltage
+
VDET
Detector Threshold
-V
DET
Minimum Operating
Voltage
VDDL
GND
GND
Delay Time
1
2
3
4
5
Operation Status
1
2
3
4
5
Comparator(-) Pin
Input Voltage
Comparator Output
L
H
Indefinite
H
L
Tr.1, 2
OFF ON
Indefinite
ON
OFF
Nch
OFF ON
Indefinite
ON
OFF
Output Tr.
Pch
ON
OFF
Indefinite
OFF
ON
Rb+Rc
V
DD
Ra+Rb+Rc
V
DD
Fig. 2 Operation Diagram
1. Output Voltage is equal to Supply Voltage. (As for Nch Open Drain Type, equal to pull-up voltage.)
2. When the Supply Voltage is down to the detector threshold voltage level(Point A),
Vref
V
DD
(
Rb+Rc)/(Ra+Rb+Rc) is true, then output of the comparator is reversed from "L" to "H", therefore
Output Voltage becomes GND level.
3. When the Supply Voltage is lower than Minimum Operating Voltage, the operation of Output Transistor is
indefinite. In the case of Nch Open Drain Type, Output Voltage is equal to pull-up Voltage.
4. Output Voltage becomes GND level.
5. When the Supply Voltage is higher than released voltage (Point B), Vref
V
DD
Rb/(Ra+Rb) is true, then
Output of the comparator reaches the threshold level, and Output of Shmitt Trigger is reversed from "H" to
"L", then Output Voltage is equal to Supply Voltage. (As for Nch Open Drain Type, equal to pull-up voltage.)
*) The difference between Released Voltage and Detector Threshold Voltage means Hysteresis Range
Voltage.
Rb
Ra+Rb
Rev. 1.10 - 3 -
q
Operation of Output Delay
Supply Voltage
Capacitor Voltage
Output Voltage
When the Supply Voltage which is higher than Released Voltage is forced to V
DD
pin, charge to an
external capacitor starts, then capacitor voltage increases. Until the capacitor voltage reaches to CD
Pin Threshold Voltage, Output Voltage maintains "L". When the capacitor voltage becomes higher than
CD pin threshold voltage, Output Voltage is reversed from "L" to "H". Where, the time interval between
the rising edge of Supply Voltage and Output Voltage Reverse point means Output Delay Time.
q
Output Delay Time
Output Delay Time (tD) can be calculated with the next formula.
t
D
=0.69
R
D
C
D(s)
RD is internal resistor and set at 6.5M
(TYP.) typically. C
D
(F) describes the capacitance value of an
external capacitor. Therefore,
t
D
=0.69
6.5
10
6
C
D(s)
CD Pin Threshold Voltage (V
TCD
)
Released Voltage (+V
DET
)
GND
GND
Output Delay Time (
t
D
)
Rev. 1.10 - 4 -
s
s
s
s
SELECTION GUIDE
The package type, the detector threshold, the output type, and the taping type of R3112 Series can
be designated at the users' request by specifying the part number as follows;
R3112
1
-
Part Number
a b c
d
Code
Contents
a
Designation of Package Type;
Q:SC-82AB
N:SOT-23-5
b
Setting Detector Threshold (-V
DET
);
Stepwise setting with a step of 0.1V in the range of 0.9V to 5.0V is possible.
c
Designation of Output Type;
A: Nch Open Drain
C: CMOS
d
Designation of Packing or Taping Type ;
Ex. SOT-23-5, SC-82AB: TR is prescribed as standard directions.
(Refer to Taping Specifications)
s
PIN CONFIGURATION
SOT-23-5 SC-82AB
MARK SIDE
1 2 3
5 4
1 2
4 3
MARK SIDE
s
PIN DESCRIPTION
SOT-23-5
SC-82AB
Pin No.
Symbol Description
Pin No.
Symbol
Description
1
OUT
Output Pin(Output "L" at detector
threshold, Output "H" at released
voltage)
1
V
DD
Voltage Supply Pin
2
V
DD
Voltage Supply Pin
2
GND
Ground Pin
3
GND
Ground Pin
3
C
D
Pin for External Capacitor
(for setting output delay)
4
NC
No Connection
4
OUT
Output Pin(Output "L"
at detector threshold, Output
"H" at released voltage)
5
C
D
Pin for External Capacitor (for
setting output delay)
Rev. 1.10 - 5 -
s
ABSOLUTE MAXIMUM RATINGS
Symbol
Item
Rating
Unit
V
DD
Supply Voltage
6.5
V
V
OUT1
Output Voltage(CMOS)
V
SS
-0.3
V
DD
+0.3
V
V
OUT2
Output Voltage(Nch)
V
SS
-0.3
6.5
V
I
OUT
Output Current
20
mA
Power Dissipation(SOT23-5)
250
P
D
Power Dissipation(SC82-AB)
150
mW
T
opt
Operating Temperature Range
-40
85
C
T
stg
Storage Temperature Range
-55
125
C
T
solder
Lead temperature (Soldering)
260
C, 10s
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are threshold limit values that must not be exceeded ever for an instant
under any conditions. Moreover, such values for any two items must not be reached simultaneously.
Operation above these absolute maximum ratings may cause degradation or permanent damage to
the device. These are stress ratings only and do not necessarily imply functional operation below
these limits.
q
R3112x091A/C
T
opt
=25
C
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
-V
DET
Detector Threshold
0.882 0.900
0.918
V
V
HYS
Detector Threshold
Hysteresis
0.027 0.045
0.063
V
V
DD
=0.80V
0.6
2.0
I
SS
Supply Current
1.90V
0.5
2.0
A
V
DDH
Maximum Operating
Voltage
6.0
V
T
opt
=25
C
0.70
V
DDL
Minimum Operating
Voltage*
Note1
-40
C
Topt
85
C
0.80
V
10
120
A
Nch
V
DS
=0.05V,V
DD
=0.70V
V
DS
=0.50V,V
DD
=0.85V 0.05
0.9
mA
I
OUT
Output Current
(Driver Output Pin)
Pch
V
DS
=-2.1V,V
DD
=4.5V
1.0
3.5
mA
V
TCD
CD pin Threshold Voltage V
DD
=0.99V
0.297 0.495
0.693
V
V
DS
=0.10V, V
DD
=0.70V
2
70
I
CD
CD pin Output Current
V
DS
=0.50V, V
DD
=0.85V
10
400
A
R
D
Output Delay Resistance
3.25
6.50
13.00
M
-V
DET
/
T
Detector Threshold
Temperature Coefficient
-40
C
Topt
85
C
100
ppm/
C
Rev. 1.10 - 6 -
q
R3112x271A/C
T
opt
=25
C
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
-V
DET
Detector Threshold
2.646
2.700
2.754
V
V
HYS
Detector Threshold Hysteresis
0.081
0.189
V
V
DD
=2.60V
1.0
2.5
I
SS
Supply Current
3.70V
0.5
3.0
A
V
DDH
Maximum Operating Voltage
6.0
V
T
opt
=25
C
0.7
V
DDL
Minimum Operating Voltage*
Note1
-40
C
Topt
85
C
0.8
V
Nch
V
DS
=0.05V,V
DD
=0.70V
10
120
A
V
DS
=0.50V,V
DD
=1.50V
1.0
3.0
mA
I
OUT
Output Current
(Driver Output Pin)
Pch
V
DS
=-2.1V,V
DD
=4.5V
1.0
3.5
mA
V
TCD
CD pin Threshold Voltage
V
DD
=2.97V
0.891
1.485
2.079
V
V
DS
=0.1V, V
DD
=0.7V
2.0
70
A
I
CD
CD pin Output Current
V
DS
=0.5V, V
DD
=1.5V
200
500
R
D
Output Delay Resistance
3.25
6.50
13.00
M
-V
DET
/
T
Detector Threshold
Temperature Coefficient
-40
C
Topt
85
C
100
ppm/
C
q
R3112x501A/C
T
opt
=25
C
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
-V
DET
Detector Threshold
4.900
5.000
5.100
V
V
HYS
Detector Threshold Hysteresis
0.150
0.250
0.350
V
V
DD
=4.9V
1.5
2.5
I
SS
Supply Current
6.0V
0.6
3.0
A
V
DDH
Maximum Operating Voltage
6.0
V
T
opt
=25
C
0.7
V
DDL
Minimum Operating Voltage*
Note1
-40
C
Topt
85
C
0.8
V
Nch
V
DS
=0.05V,V
DD
=0.70V
10
120
A
V
DS
=0.50V,V
DD
=1.50V
1.0
3.0
mA
I
OUT
Output Current
(Driver Output Pin)
Pch
V
DS
=-2.1V,V
DD
=6.0V
1.5
4.5
mA
V
TCD
CD pin Threshold Voltage
V
DD
=2.97V
1.650
2.750
3.850
V
V
DS
=0.1V, V
DD
=0.7V
2.0
70
A
I
CD
CD pin Output Current
V
DS
=0.5V, V
DD
=1.5V
200
500
R
D
Output Delay Resistance
3.25
6.50
13.00
M
-V
DET
/
T
Detector Threshold
Temperature Coefficient
-40
C
Topt
85
C
100
ppm/
C
*Note1: Minimum Operating Voltage means the value of input voltage when output voltage maintains
0.1V or less.
(In the case of Nch Open Drain Type, Output pin is pulled up with a resistance of 470k
to 5.0V.)
Rev. 1.10 - 7 -
s
TEST CIRCUITS
*Pull-up circuit is not necessary for CMOS Output type, or R3112XXXXC.
Supply Current Test Circuit
Detector Threshold Test Circuit
R3112X
Series
V
DD
GND
I
SS
R3112
Series
V
DD
GND
V
IN
470k
OUT
+5V or
V
DD
Nch Driver Output Current Test Circuit
Pch Driver Output Current Test Circuit
*Apply only to
CMOS
R3112
Series
V
DD
GND
V
IN
OUT
V
DS
I
OUT
R3112X
Series
V
DD
GND
V
IN
OUT
V
DD
+V
DS
I
OUT
CD Pin Threshold Test Circuit
CD Pin Output Current Test Circuit
R3112X
Series
V
DD
GND
V
IN
470k
OUT
+5V or V
DD
V
DS
CD
R3112X
Series
V
DD
GND
V
IN
V
DS
C
D
I
CD
Output Delay Time Test Circuit
R3112X
Series
V
DD
GND
V
IN
470k
OUT
+5V
C
D
C
D
GND
GND
50%
100%
0.7V
+V
DET
+2.0V or 6.0V
Input
Voltage
Output Voltage
Rev. 1.10 - 8 -
s
s
s
s
TYPICAL CHARACTERISTICS
1) Supply Current vs. Input Voltage
R3112X091X
R3112X131X
0
0.3
0.6
0.9
1.2
1.5
0
1
2
3
4
5
6
7
Input Voltage V
IN
(V)
Supply Current Iss (uA)
0
0.3
0.6
0.9
1.2
1.5
0
1
2
3
4
5
6
7
Input Voltage V
IN
(V)
Supply Current Iss (uA)
R3112X271X
R3112X451X
0
0.3
0.6
0.9
1.2
1.5
0
1
2
3
4
5
6
7
Input Voltage V
IN
(V)
Supply Current Iss(uA)
0
0.4
0.8
1.2
1.6
2
0
1
2
3
4
5
6
7
Input Voltage V
IN
(V)
Supply Current Iss (uA)
2) Detector Threshold vs. Temperature
R3112X091X
R3112X131X
0.86
0.88
0.90
0.92
0.94
0.96
0.98
-50
-25
0
25
50
75
100
Temperature Topt
Detector Threshold/Released Voltage
V
DET
V
1.26
1.28
1.30
1.32
1.34
1.36
1.38
1.40
1.42
-50
-25
0
25
50
75
100
Temperature Topt
Detector Threshold/Released Voltage
VDET
V
Topt=85
C
25
C
-40
C
-40
C
Topt=85
C
25
C
-40
C
25
C
Topt=85
C
Topt=85
C
25
C
-40
C
(
C)
+V
DET
-V
DET
(
C)
+V
DET
-V
DET
Rev. 1.10 - 9 -
R3112X271X
R3112X451X
2.60
2.65
2.70
2.75
2.80
2.85
2.90
-50
-25
0
25
50
75
100
Temperature Topt
Detector Threshold/Released Voltage
V
DET
V
4.35
4.40
4.45
4.50
4.55
4.60
4.65
4.70
4.75
-50
-25
0
25
50
75
100
Temperature Topt
Detector Threshold/Released Voltage
VDET
V
3) Output Voltage vs. Input Voltage
R3112X091X
R3112X091A
Nch Output Type: V
DD
pull up
5V pull up via 470k
0.0
0.2
0.4
0.6
0.8
1.0
0
0.2
0.4
0.6
0.8
1
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0
0.2
0.4
0.6
0.8
1
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
R3112X131X
R3112X131A
Nch Output Type: V
DD
pull up
5V pull up via 470k
0
0.3
0.6
0.9
1.2
1.5
0
0.3
0.6
0.9
1.2
1.5
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0
0.3
0.6
0.9
1.2
1.5
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
(
C)
+V
DET
-V
DET
+V
DET
-V
DET
(
C)
Topt=-40
C
25
C
85
C
Topt=-40
C
25
C
85
C
Topt=-40
C
25
C
85
C
Topt=-40
C
25
C
85
C
Rev. 1.10 - 10 -
R3112X271X
R3112X271A
Nch Output Type: V
DD
pull up
5V pull up via 470k
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
R3112X451X
R3112X451A
Nch Output Type: V
DD
pull up
5V pull up via 470k
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Input Voltage V
IN
(V)
Output Voltage V
OUT
(V)
4) Nch Driver Output Current vs. V
DS
R3112X091X
R3112X131X
0
0.2
0.4
0.6
0.8
1
1.2
0
0.2
0.4
0.6
0.8
1
V
DS
(V)
Output Current I
OUT
(mA)
0
0.5
1
1.5
2
2.5
0
0.2
0.4
0.6
0.8
1
V
DS
(V)
Output Current I
OUT
(mA)
Topt=-40
C
25
C
85
C
Topt=-40
C
25
C
85
C
Topt=-40
C
25
C
85
C
Topt=-40
C
25
C
85
C
V
DD
=0.85V
V
DD
=0.7V
V
DD
=0.7V
V
DD
=0.85V
V
DD
=1.0V
Rev. 1.10 - 11 -
R3112X271X
R3112X451X
0
4
8
12
16
20
0
0.5
1
1.5
2
2.5
V
DS
(V)
Output Current I
OUT
(mA)
0
4
8
12
16
20
0
0.5
1
1.5
2
2.5
3
3.5
4
V
DS
(V)
Output Current I
OUT
(mA)
5) Nch Driver Output Current vs. Input Voltage
R3112X091X
R3112X131X
0.0
0.5
1.0
1.5
2.0
0
0.2
0.4
0.6
0.8
1
Input Voltage V
IN
(V)
Output Current I
OUT
(mA)
0
1
2
3
4
5
0
0.3
0.6
0.9
1.2
1.5
Input Voltage V
IN
(V)
Output Current I
OUT
(mA)
R3112X271X
R3112X451X
0
1
2
3
4
5
0
0.5
1
1.5
2
2.5
3
Input Voltage V
IN
(V)
Output Current I
OUT
(mA)
0
1
2
3
4
5
0
1
2
3
4
5
Input Voltage V
IN
(V)
Output Current I
OUT
(mA)
V
DD
=1.0V
V
DD
=1.5V
V
DD
=2.0V
V
DD
=2.5V
V
DD
=1.0V
V
DD
=1.5V
V
DD
=2.0V
V
DD
=2.5V
V
DD
=3.0V
V
DD
=3.5V
V
DD
=4.0V
Topt=85
C
25
C
-40
C
Topt=85
C
25
C
-40
C
Topt=85
C
25
C
-40
C
Topt=85
C
25
C
-40
C
Rev. 1.10 - 12 -
6) Pch Driver Output Current vs. Input Voltage
R3112X091C
R3112X131C
0
1
2
3
4
5
6
0
1
2
3
4
5
6
7
Input Voltage V
IN
(V)
Output Current I
OUT
(mA)
0
1
2
3
4
5
6
0
1
2
3
4
5
6
7
Input Voltage V
IN
(V)
Output Current I
OUT
(mA)
R3112X271C
R3112X451C
0
1
2
3
4
5
6
0
1
2
3
4
5
6
7
Input Voltage V
IN
(V)
Output Current I
OUT
(mA)
0
1
2
3
4
5
6
0
1
2
3
4
5
6
7
Input Voltage V
IN
(V)
Output Current I
OUT
(mA)
7) C
D
Pin Threshold Voltage vs. Temperature
R3112X091X V
DD
=0.99V
R3112X131X V
DD
=1.43V
0.2
0.3
0.4
0.5
0.6
0.7
0.8
-50
-25
0
25
50
75
100
Temperature Topt
CD Pin Threshold Voltage Vtcd
V)
0.4
0.5
0.6
0.7
0.8
0.9
1.0
-50
-25
0
25
50
75
100
Temperature Topt
CD Pin Threshold Voltage Vtcd
V
V
DS
=-2.1V
-1.5V
-1.0V
-0.5V
V
DS
=-2.1V
-1.5V
-1.0V
-0.5V
-0.5V
-1.0V
-1.5V
V
DS
=-2.1V
V
DS
=-2.1V
-1.5V
-1.0V
-0.5V
(
C)
(
C)
Rev. 1.10 - 13 -
R3112X271X V
DD
=2.97V
R3112X451X V
DD
=4.95V
1.3
1.4
1.5
1.6
1.7
1.8
1.9
-50
-25
0
25
50
75
100
Temperature Topt
CD Pin Threshold Voltage Vtcd
V
2.3
2.4
2.5
2.6
2.7
2.8
2.9
-50
-25
0
25
50
75
100
Temperature Topt
CD Pin Threshold Voltage Vtcd
V
8) C
D
Pin Output Current vs. Input Voltage
R3112X091X V
DS
=0.5V
R3112X131X V
DS
=0.5V
0
0.2
0.4
0.6
0.8
1
0
0.2
0.4
0.6
0.8
1
Input Voltage V
IN
(V)
CD Pin Output Current Icd (mA)
0
0.2
0.4
0.6
0.8
1
0
0.3
0.6
0.9
1.2
1.5
Input Voltage V
IN
(V)
CD Pin Output Current Icd (mA)
R3112X271X V
DS
=0.5V
R3112X451X V
DS
=0.5V
0
0.2
0.4
0.6
0.8
1
0
0.5
1
1.5
2
2.5
3
Input Voltage V
IN
(V)
CD Pin Output Current Icd (mA)
0
0.2
0.4
0.6
0.8
1
0
1
2
3
4
5
Input Voltage V
IN
(V)
CD Pin Output Current Icd (mA)
(
C)
(
C)
Topt=-40
C
25
C
85
C
Topt=-40
C
25
C
85
C
Topt=-40
C
25
C
85
C
Topt=-40
C
25
C
85
C
Rev. 1.10 - 14 -
9) C
D
Pin Output Current vs. V
DS (Topt=25C)
R3112X091X
R3112X131X
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0
0.2
0.4
0.6
0.8
1
V
DS
(V)
CD Pin Output Current Icd (mA)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
0.2
0.4
0.6
0.8
1
V
DS
(V)
CD Pin Output Current Icd(m
A
R3112X271X
R3112X451X
0
0.5
1
1.5
2
2.5
3
0
0.5
1
1.5
2
2.5
V
DS
(V)
CD Pin Output Current Icd (mA)
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
0
0.5
1
1.5
2
2.5
3
3.5
4
V
DS
(V)
CD Pin Output Current Icd (mA)
10) Output Delay Time vs. External Capacitance
(Topt=25C)
R3112X091X
R3112X131X
0.01
0.1
1
10
100
1000
0.0001
0.001
0.01
0.1
External Capacitance Cd (uF
Output Delay Time tx
ms
0.01
0.1
1
10
100
1000
0.0001
0.001
0.01
0.1
External Capacitance Cd(uF
Output Delay Time tD
ms
V
DD
=0.85V
V
DD
=0.7V
V
DD
=0.7V
V
DD
=0.85V
V
DD
=1.0V
V
DD
=1.0V
V
DD
=1.5V
V
DD
=2.0V
V
DD
=2.5V
V
DD
=1.0V
V
DD
=1.5V
V
DD
=2.0V
V
DD
=2.5V
V
DD
=3.0V
V
DD
=3.5V
V
DD
=4.0V
t
D
tpHL
t
D
tpHL
Rev. 1.10 - 15 -
R3112X271X
R3112X451X
0.01
0.1
1
10
100
1000
0.0001
0.001
0.01
0.1
External Capacitance Cd(uF
Output Delay Time tx
ms
0.01
0.1
1
10
100
1000
0.0001
0.001
0.01
0.1
External Capacitance Cd(uF
Output Delay Time tx
ms
11) Delay Circuit Resistance vs. Temperature
R3112XXX1X
3
4
5
6
7
8
9
10
11
12
13
-50
-25
0
25
50
75
100
Temperature Topt
Delay Circuit Resistance Rd
MOhm
t
D
tpHL
t
D
tpHL
Rev. 1.10 - 16 -
s
s
s
s
TECHNICAL NOTES
R3112x
Series
OUT
GND
V
DD
R
R3112X
Series
OUT
V
DD
GND
V
DD
R1
R2
R311 2x
Series
OUT
V
DD
GND
V
DD
R1
R2
Figure A Figure B Figure C
When R3112XXX1A (Nch Open Drain Output Type) is used in Figure A or Figure B, if Impedance of
Voltage Supply pIn, V
DD
and V
DD
of this IC is large, detector threshold level would shift by voltage
dropdown caused by the consumption current of the IC itself. Released voltage may also shift and delay
time for start-up might be generated by this usage.
When R3112XXX1C (CMOS Output Type) is used in Figure A or Figure B, Output level could be
unstable by throughout current which is generated at detector threshold level or at released voltage
level, therefore, do not use R3112XXX1C with the connection in Figure A or Figure B.
The connection in Figure C may cause the oscillation in both R3112XXX1C (CMOS Output) and
R3112XXX1A (Nch Open Drain Output), therefore do not use R3112XXX1X Series with the connection
in Figure C.
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