R3112N091C-TR [RICOH]
LOW VOLTAGE DETECTOR WITH OUTPUT DELAY; 与输出延迟低电压检测器
| 型号： | R3112N091C-TR |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | LOW VOLTAGE DETECTOR WITH OUTPUT DELAY |
| 文件： | 总16页 (文件大小：268K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
2001. Apr. 4
LOW VOLTAGE DETECTOR WITH OUTPUT DELAY
R3112xxx1A/C Series
ꢀ 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.
ꢀ FEATURES
ꢀBuilt-in Output Delay Circuit• • • • • • • • • • •TYP. 100ms with an external capacitor: 0.022µF
ꢀUltra-low Supply Current• • • • • • • • • • •TYP. 1.0µA (VDD=3.5V)
ꢀWide Range of Operating Voltage • • • • • •0.7 6.0V(Topt=25°C)
ꢀDetector Threshold • • • • • • • • •Stepwise setting with a step of 0.1V in the range of 0.9V to 5.0V
is possible.
ꢀHigh Accuracy Detector Threshold • • • • • • • ±2.0%
ꢀLow Temperature-Drift Coefficient of Detector Threshold• • • • • • • • • TYP. ±100ppm/°C
ꢀTwo Output Types• • • • • • • • • • • • • • • • • • • Nch Open Drain and CMOS
ꢀTwo Types of Packages • • • • • • • • • • SOT-23-5 (Mini-mold), SC-82AB
ꢀ APPLICATIONS
• CPU and Logic Circuit Reset
• Battery Checker
• Window Comparator
• Wave Shaping Circuit
• Battery Back-up Circuit
• Power Failure Detector
ꢀ BLOCK DIAGRAMS
R3112XXX1A
R3112XXX1C
RD
VDD
VDD
RD
OUT
GND
+
-
OUT
GND
+
--
Vref
Vref
CD
D
C
Rev. 1.10
- 1 -
ꢀ OPERATION
VDD
OUT
Comparator
Ra
Current Source
Schmitt Trigger
-
RD
Pch
Nch
+
Rb
Rc
Tr.2
Tr.1
Vref
GND
Output Capacitor
CD
Fig. 1 Block Diagram with an external capacitor
Operation Status
1
Ι
2
ΙΙ
H
3
ΙΙ
4
ΙΙ
H
5
Ι
1
2
3
4
5
Released Voltage
+VDET
B
Comparator(-) Pin
Input Voltage
HYSTERESIS RANGE
Detector Threshold
-VDET
A
Comparator Output
Tr.1, 2
L
Indefinite
L
Supply Voltage
(VDD)
VDDL
OFF ON
OFF ON
OFF
OFF
Indefinite ON
Indefinite ON
Minimum Operating
Voltage
GND
Nch
Output Tr.
Pch
ON
OFF Indefinite OFF ON
Output Voltage
(OUT)
Delay Time
Ι
Rb+Rc ×VDD
GND
Ra+Rb+Rc
Rb
ΙΙ
×VDD
Ra+Rb
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≥VDD×(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≤VDD×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.
Rev. 1.10
- 2 -
Operation of Output Delay
ꢀ
Released Voltage (+VDET
)
Supply Voltage
Capacitor Voltage
Output Voltage
CD Pin Threshold Voltage (VTCD
GND
)
GND
Output Delay Time ( )
D
t
When the Supply Voltage which is higher than Released Voltage is forced to VDD 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.
Output Delay Time
ꢀ
Output Delay Time (tD) can be calculated with the next formula.
D(s)
D
D
t =0.69ꢀR ꢀC
RD is internal resistor and set at 6.5M (TYP.) typically. CD(F) describes the capacitance value of an
Ω
external capacitor. Therefore,
6
D
D(s)
t =0.69ꢀ6.5ꢀ10 ꢀC
Rev. 1.10
- 3 -
ꢀ 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
a
Contents
Designation of Package Type;
Q:SC-82AB
N:SOT-23-5
b
c
d
Setting Detector Threshold (-VDET);
Stepwise setting with a step of 0.1V in the range of 0.9V to 5.0V is possible.
Designation of Output Type;
A: Nch Open Drain
C: CMOS
Designation of Packing or Taping Type ;
Ex. SOT-23-5, SC-82AB: TR is prescribed as standard directions.
(Refer to Taping Specifications)
ꢀ PIN CONFIGURATION
SOT-23-5
SC-82AB
5
4
4
3
MARK SIDE
MARK SIDE
1
2
1
2
3
ꢀ PIN DESCRIPTION
SOT-23-5
Pin No. Symbol Description
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀSC-82AB
Pin No. Symbol
Description
1
OUT Output Pin(Output “L” at detector
1
VDD
Voltage Supply Pin
threshold, Output “H” at released
voltage)
2
3
VDD
Voltage Supply Pin
2
3
GND Ground Pin
CD Pin for External Capacitor
GND Ground Pin
(for setting output delay)
OUT Output Pin(Output “L”
at detector threshold, Output
“H” at released voltage)
4
5
NC
CD
No Connection
4
Pin for External Capacitor (for
setting output delay)
Rev. 1.10
- 4 -
ꢀABSOLUTE MAXIMUM RATINGS
Symbol
VDD
Item
Supply Voltage
Rating
6.5
Unit
V
VOUT1
VOUT2
IOUT
Output Voltage(CMOS)
Output Voltage(Nch)
Output Current
Power Dissipation(SOT23-5)
Power Dissipation(SC82-AB)
Operating Temperature Range
Storage Temperature Range
Lead temperature (Soldering)
VSS-0.3 VDD+0.3
VSS-0.3 6.5
20
V
V
mA
mW
PD
250
150
-40 85
-55 125
Topt
Tstg
Tsolder
°C
°C
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.
ꢀR3112x091A/C
Topt=25°C
Symbol
-VDET
VHYS
Item
Conditions
MIN. TYP. MAX.
0.882 0.900 0.918
0.027 0.045 0.063
Unit
V
V
Detector Threshold
Detector Threshold
Hysteresis
ISS
Supply Current
VDD=0.80V
1.90V
0.6
0.5
2.0
2.0
µA
VDDH
VDDL
Maximum Operating
Voltage
6.0
V
V
Minimum Operating
Topt=25°C
-40°C ≤ Topt ≤ 85°C
0.70
0.80
Voltage*Note1
Nch
VDS=0.05V,VDD=0.70V 10
µA
Output Current
120
0.9
IOUT
(Driver Output Pin)
VDS=0.50V,VDD=0.85V
0.05
mA
mA
Pch
VDS=-2.1V,VDD=4.5V
1.0
3.5
VTCD
ICD
CD pin Threshold Voltage VDD=0.99V
0.297 0.495 0.693
V
µA
CD pin Output Current
VDS=0.10V, VDD=0.70V
2
70
VDS=0.50V, VDD=0.85V
10
400
RD
∆-VDET/∆T
Output Delay Resistance
Detector Threshold
3.25 6.50
13.00
MΩ
ppm/°C
-40°C ≤ Topt ≤ 85°C
±100
Temperature Coefficient
Rev. 1.10
- 5 -
ꢀR3112x271A/C
Symbol
Topt=25°C
Item
Conditions
MIN.
2.646
0.081
TYP.
MAX.
2.700 2.754
0.189
Unit
V
V
-VDET
Detector Threshold
VHYS
ISS
Detector Threshold Hysteresis
Supply Current
VDD=2.60V
3.70V
1.0
0.5
2.5
3.0
6.0
0.7
0.8
µA
VDDH
VDDL
Maximum Operating Voltage
V
V
Minimum Operating Voltage*Note1
Topt=25°C
-40°C ≤Topt≤85°C
Nch
VDS=0.05V,VDD=0.70V
VDS=0.50V,VDD=1.50V
Pch
10
1.0
120
3.0
µA
mA
mA
IOUT
Output Current
(Driver Output Pin)
VDS=-2.1V,VDD=4.5V
VDD=2.97V
VDS=0.1V, VDD=0.7V
VDS=0.5V, VDD=1.5V
1.0
0.891
2.0
3.5
VTCD
ICD
CD pin Threshold Voltage
CD pin Output Current
1.485 2.079
70
500
V
µA
200
RD
∆-VDET/∆T
Output Delay Resistance
Detector Threshold
3.25
6.50
±100
13.00
MΩ
ppm/°C
-40°C ≤Topt≤85°C
Temperature Coefficient
ꢀR3112x501A/C
Symbol
Topt=25°C
Item
Conditions
MIN.
TYP. MAX.
4.900 5.000 5.100
0.150 0.250 0.350
Unit
V
V
-VDET
Detector Threshold
VHYS
ISS
Detector Threshold Hysteresis
Supply Current
VDD=4.9V
6.0V
1.5
0.6
2.5
3.0
6.0
0.7
0.8
µA
VDDH
VDDL
Maximum Operating Voltage
Minimum Operating Voltage*Note1
V
V
Topt=25°C
-40°C ≤Topt≤85°C
Nch
VDS=0.05V,VDD=0.70V
VDS=0.50V,VDD=1.50V
10
1.0
120
3.0
µA
mA
mA
IOUT
Output Current
(Driver Output Pin)
Pch
VDS=-2.1V,VDD=6.0V
VDD=2.97V
VDS=0.1V, VDD=0.7V
1.5
4.5
VTCD
ICD
CD pin Threshold Voltage
CD pin Output Current
1.650 2.750 3.850
2.0
V
µA
70
VDS=0.5V, VDD=1.5V
200
3.25
500
6.50
±100
RD
∆-VDET/∆T
Output Delay Resistance
Detector Threshold
13.00
MΩ
ppm/°C
-40°C≤Topt≤85°C
Temperature Coefficient
*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 470kΩ to 5.0V.)
Rev. 1.10
- 6 -
ꢀ TEST CIRCUITS
*Pull-up circuit is not necessary for CMOS Output type, or R3112XXXXC.
Supply Current Test Circuit
ISS
Detector Threshold Test Circuit
+5V or
VDD
VDD
470k
Ω
VDD
R3112
Series
VIN
R3112X
Series
OUT
GND
GND
Nch Driver Output Current Test Circuit
Pch Driver Output Current Test Circuit *Apply only to
CMOS
VDD
VDD
IOUT
IOUT
R3112X
R3112
Series
VIN
VIN
Series
OUT
OUT
VDS
VDD+VDS
GND
GND
CD Pin Threshold Test Circuit
CD Pin Output Current Test Circuit
VDD
+5V or VDD
ICD
CD
VDD
R3112X
Series
VIN
470kΩ
CD R3112X
Series
VIN
VDS
VDS
OUT
GND
GND
Output Delay Time Test Circuit
+VDET+2.0V or 6.0V
+5V
470kΩ
VDD
Input
CD
Voltage
VIN
R3112X
Series
0.7V
GND
OUT
100%
CD
Output Voltage
GND
50%
GND
Rev. 1.10
- 7 -
ꢀ TYPICAL CHARACTERISTICS
1) Supply Current vs. Input Voltage
R3112X091X
R3112X131X
1.5
1.2
0.9
0.6
0.3
0
1.5
1.2
Topt=85°C
Topt=85°C
25°C
25°C
0.9
0.6
0.3
0
-40°C
-40°C
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Input Voltage VIN(V)
Input Voltage VIN(V)
R3112X271X
R3112X451X
1.5
1.2
0.9
0.6
0.3
0
2
Topt=85°C
1.6
1.2
0.8
0.4
0
Topt=85°C
25°C
25°C
-40°C
-40°C
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
IN
Input Voltage V (V)
Input Voltage VIN(V)
2) Detector Threshold vs. Temperature
R3112X091X
R3112X131X
1.42
1.40
1.38
1.36
1.34
1.32
1.30
1.28
1.26
0.98
0.96
+VDET
+VDET
-VDET
0.94
0.92
0.90
0.88
0.86
-VDET
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
(°C)
100
Temperature Topt
Temperature Topt
(°C)
Rev. 1.10
- 8 -
R3112X271X
R3112X451X
2.90
2.85
2.80
2.75
2.70
2.65
2.60
4.75
4.70
4.65
4.60
4.55
4.50
4.45
4.40
4.35
+VDET
-VDET
+VDET
-VDET
-50
-25
0
25
50
75
(°C)
100
-50
-25
0
25
50
75
(°C)
100
Temperature Topt
Temperature Topt
3) Output Voltage vs. Input Voltage
R3112X091X
R3112X091A
5V pull up via 470kΩ
Nch Output Type: VDD pull up
1.0
0.8
0.6
0.4
0.2
0.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Topt=-40°C
25°C
85°C
Topt=-40°C
25°C
85°C
0
0.2
0.4
0.6
0.8
1
0
0.2
0.4
0.6
0.8
1
IN
Input Voltage V (V)
IN
Input Voltage V (V)
R3112X131X
R3112X131A
Nch Output Type: VDD pull up
5V pull up via 470kΩ
1.5
1.2
0.9
0.6
0.3
0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Topt=-40°C
25°C
85°C
Topt=-40°C
25°C
85°C
0
0.3
0.6
0.9
1.2
1.5
0
0.3
0.6
0.9
1.2
1.5
IN
Input Voltage V (V)
Input Voltage VIN(V)
Rev. 1.10
- 9 -
R3112X271X
Nch Output Type: VDD pull up
R3112X271A
5V pull up via 470kΩ
3.0
2.5
2.0
1.5
1.0
0.5
0.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Topt=-40°C
25°C
85°C
Topt=-40°C
25°C 85°C
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
IN
Input Voltage V (V)
Input Voltage VIN(V)
R3112X451X
R3112X451A
Nch Output Type: VDD pull up
5V pull up via 470kΩ
5.0
6.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
5.0
4.0
3.0
2.0
1.0
0.0
Topt=-40°C
25°C
85°C
Topt=-40°C
25°C
85°C
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Input Voltage VIN(V)
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Input Voltage VIN(V)
4) Nch Driver Output Current vs. VDS
R3112X091X
R3112X131X
VDD=1.0V
2.5
2
1.2
VDD=0.85V
1
0.8
0.6
0.4
0.2
0
1.5
1
VDD=0.85V
VDD=0.7V
VDD=0.7V
0.5
0
0
0.2
0.4
0.6
0.8
1
0
0.2
0.4
0.6
(V)
0.8
1
VDS(V)
DS
V
Rev. 1.10
- 10 -
R3112X271X
R3112X451X
20
16
12
8
20
16
12
8
VDD=4.0V
VDD=3.5V
VDD=3.0V
VDD=2.5V
VDD=2.5V
VDD=2.0V
VDD=2.0V
VDD=1.5V
VDD=1.5V
4
4
VDD=1.0V
VDD=1.0V
0
0
0
0.5
1
1.5
(V)
2
2.5
0
0.5
1
1.5
2
2.5
3
3.5
4
DS
V
VDS(V)
5) Nch Driver Output Current vs. Input Voltage
R3112X091X
R3112X131X
2.0
5
4
3
2
1
0
1.5
-40°C
25°C
1.0
25°C
0.5
Topt=85°C
-40°C
Topt=85°C
0.0
0
0.2
0.4
0.6
0.8
1
0
0.3
0.6
0.9
1.2
1.5
Input Voltage VIN(V)
IN
Input Voltage V (V)
R3112X271X
R3112X451X
5
4
3
2
1
0
5
4
3
2
1
0
-40°C
-40°C
25°C
25°C
Topt=85°C
Topt=85°C
0
1
2
3
4
5
0
0.5
1
1.5
2
2.5
3
IN
Input Voltage V (V)
IN
Input Voltage V (V)
Rev. 1.10
- 11 -
6) Pch Driver Output Current vs. Input Voltage
R3112X091C
R3112X131C
VDS=-2.1V
6
6
5
4
3
2
1
0
5
VDS=-2.1V
4
-1.5V
-1.0V
-0.5V
-1.5V
3
-1.0V
2
-0.5V
1
0
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
IN
Input Voltage V (V)
IN
Input Voltage V (V)
R3112X271C
R3112X451C
6
6
5
4
3
2
1
0
5
4
3
2
1
0
VDS=-2.1V
-1.5V
-1.0V
VDS=-2.1V
-1.5V
-1.0V
-0.5V
-0.5V
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
IN
Input Voltage V (V)
IN
Input Voltage V (V)
7) CD Pin Threshold Voltage vs. Temperature
R3112X091X VDD=0.99V
R3112X131X
VDD=1.43V
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.8
0.7
0.6
0.5
0.4
0.3
0.2
-50
-25
0
25
50
75
(°C)
100
-50
-25
0
25
50
75
(°C)
100
Temperature Topt
Temperature Topt
Rev. 1.10
- 12 -
R3112X271X
VDD=2.97V
R3112X451X
VDD=4.95V
1.9
1.8
1.7
1.6
1.5
1.4
1.3
2.9
2.8
2.7
2.6
2.5
2.4
2.3
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
(°C)
Temperature Topt
Temperature Topt
(°C)
8) CD Pin Output Current vs. Input Voltage
R3112X091X
VDS=0.5V
R3112X131X
VDS=0.5V
1
0.8
0.6
0.4
0.2
0
1
0.8
0.6
0.4
0.2
0
Topt=-40°C
Topt=-40°C
25°C
25°C
85°C
85°C
0
0.2
0.4
0.6
0.8
1
0
0.3
0.6
0.9
1.2
1.5
IN
Input Voltage V (V)
IN
Input Voltage V (V)
R3112X271X
VDS=0.5V
R3112X451X
VDS=0.5V
1
0.8
0.6
0.4
0.2
0
1
0.8
0.6
0.4
0.2
0
Topt=-40°C
Topt=-40°C
25°C
25°C
85°C
85°C
0
0.5
1
1.5
2
2.5
3
0
1
2
3
4
5
IN
Input Voltage V (V)
IN
Input Voltage V (V)
Rev. 1.10
- 13 -
9) CD Pin Output Current vs. VDS (Topt=25°C)
R3112X091X
R3112X131X
0.7
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
VDD=0.85V
0.6
VDD=1.0V
0.5
0.4
VDD=0.85V
0.3
VDD=0.7V
0.2
0.1
0
VDD=0.7V
0
0.2
0.4
0.6
0.8
1
0
0.2
0.4
0.6
0.8
1
VDS(V)
VDS(V)
R3112X271X
R3112X451X
4.5
3
VDD=4.0V
VDD=3.0V
4
3.5
3
2.5
2
VDD=2.5V
VDD=3.5V
VDD=2.0V
VDD=1.5V
VDD=2.5V
2.5
2
1.5
1
VDD=2.0V
VDD=1.5V
VDD=1.0V
1.5
1
VDD=1.0V
0.5
0
0.5
0
0
0.5
1
1.5
VDS(V)
2
2.5
0
0.5
1
1.5
2
2.5
3
3.5
4
DS
(V)
V
10) Output Delay Time vs. External Capacitance
R3112X091X
(Topt=25°C)
R3112X131X
1000
1000
tD
100
10
100
10
1
tD
1
0.1
tpHL
0.1
tpHL
0.01
0.01
0.0001
0.001
0.01
0.1
0.0001
0.001
0.01
0.1
External Capacitance Cd (uF）
External Capacitance Cd(uF）
Rev. 1.10
- 14 -
R3112X271X
R3112X451X
1000
100
10
1000
100
10
tD
tD
tpHL
tpHL
1
1
0.1
0.01
0.1
0.01
0.0001
0.001
0.01
0.1
0.0001
0.001
0.01
0.1
External Capacitance Cd(uF）
External Capacitance Cd(uF
）
11) Delay Circuit Resistance vs. Temperature
R3112XXX1X
13
12
11
10
9
8
7
6
5
4
3
-50
-25
0
25
50
75
100
Temperature Topt
Rev. 1.10
- 15 -
ꢀ TECHNICAL NOTES
VDD
VDD
VDD
R1
R1
R
VDD
VDD
R2
R3112X
Series
R311 2x
Series
R2
R3112x
Series
OUT
OUT
OUT
GND
Figure B
GND
Figure C
GND
Figure A
When R3112XXX1A (Nch Open Drain Output Type) is used in Figure A or Figure B, if Impedance of
Voltage Supply pIn, VDD and VDD 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.
Rev. 1.10
- 16 -
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