LESHAN RADIO COMPANY, LTD.
LR8808
Micropocessor Reset Circuits
General Description
The LR8808 series are ultar-low current voltage detectors,which can be used to monitor the power supplies in microprocessor
and digital systems. There are two output forms,and Nch open-drain and CMOS output are available.
The LR8808 series are available SOT23(-3 -5) package.Performance is specified for -40℃to +85℃ temperature range.
Features
★0.95V
to 8V input range
★Reset
Threshold:1.5V½6.0V in 0.1V increments
★High-precision
detection voltage: ±2.0 %
★Ultra-low
current consumption: 1.0μA@3.5V(typ)
★SOT23-3
SOT23-5 package
★NMOS
Open Drain and CMOS Output (Active Low
)
★40℃
to +85
℃
junction temperature range for operation
Applications
★Battery-Powered
Systems
★Power
Supply Monitoring
★Handheld
and Portable Equipment
★Processor
Supervisor Reset
Typical Application Circuit
Block Diagram
(*1:
parasitic diode)
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LESHAN RADIO COMPANY, LTD.
LR8808
Pin Descriptions
SOT23
Pin No
A
M
SOT23-5
R
1
2
3
4
5
Gnd
Vout
Vcc
－
－
Vout
Gnd
Vcc
－
－
Vout
Vcc
Gnd
No connection
No connection
Connection Diagrams
SOT23 package
SOT23-5 package
Ordering Information
The package type,the detector threshold,the output type and the taping type of LR8808 series can be designated at user’s request
as following:
CODE
SYMBOL
1.5~6.0
C
N
DESCRIPTION
Detect Voltage
a
b
CMOS Output
Nch open drain Output
Package:SOT23
Package:SOT23-5
Gnd to Gnd +10V
Gnd to Gnd +10V
−40°C
to +85°C
−40°C
to +125°C
250mW
c
A/M
R
Absolute Maximum Ratings
V
IN
V
OUT
Junction Temperature
Storage Temperature
Power Dissipation
SOT23
Operating Ratings
V
IN
V
OUT
Junction Temperature
Junction-to-Ambient Thermal
Resistance (θ
JA
)
SOT23
0.95V to 8V
0 to V
IN
−40°C
to +85°C
301
°C /W
SOT23-5
220°C /W
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LESHAN RADIO COMPANY, LTD.
LR8808
Electrical Characteristics
Unless otherwise specified,Typical values and limits appearing in standard typeface are for T
a
= 25°C.
Symbol
−
V
DET
(Figure1)
Item
Detection
voltage
Hysteresis
Width
Conditions
Min
−
V
DET（S）
Type
−
V
DET（S）
Max
−
V
DET（S）
Unit
V
－
－
V
CC
=
−
V
DET
+
0.5V
LR8808－2.0½2.6
C/N
LR8808－2.6½3.9
C/N
LR8808－3.9½6.0
C/N
×0.98
×1.02
−
V
DET（S）
−
V
DET（S）
−
V
DET（S）
V
HYS
(Figure1)
×0.02
－
－
－
×0.05
1.0
1.2
1.5
×0.08
2.0
2.5
3.0
V
µA
µA
µA
V
mA
mA
mA
mA
mA
mA
µA
ppm/
°C
µs
Iss
Current
Consumption
Vcc
Operating
voltage
－
LR8808－2.0½2.6
NMOS:
C/N
V
OUT
=0.5V
LR8808－2.6½3.9
Vcc=
−
V
DET
−0.5
C/N
LR8808－3.9½6.0
C/N
LR8808－2.0½2.6
PMOS:
C/N
Vcc−V
OUT
=0.5V
LR8808－2.6½3.9
Vcc=
−
V
DET
+0.5
C/N
LR8808－3.9½6.0
C/N
Only for NMOS open-drain output products,
V
CC
=8.0 V, V
OUT
=8.0 V
Ta=−40°C to +85°C
0.95
3.0
3.0
3.0
1.5
1.5
1.5
－
13.0
15.0
18.0
4.0
6.0
8.0
－
8
－
－
－
－
－
－
0.1
±360
200
I
OUT
Output
Current
I
LEAK
Leakage
current
Temperature
coefficient
Delay time
－
±120
T
PLH
Figure1
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51mcu
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