ME2808
Voltage Detectors , ME2808 Series
General Description
ME2808 Series
are a set of three-terminal low
power voltage detectors implemented in NMOS
technology. Each voltage detector in the series
detects a particular fixed voltage ranging from 2.0V
to 7.0V. The voltage detectors consist of a high
precision and low power consumption standard
voltage source, a comparator, hysteresis circuit, and
an output driver. NMOS technology ensures low
power consumption.
Features
Highly accuracy： ± 1%
Low power consumption：TYP 1.8uA (Vin=3V)
Detect
voltage
range
：
2.0V~7.0V
in
0.1V
increments
Operating voltage range：1.5V~18V
Detect voltage temperature characteristics：
TYP ± 0.9mV/℃
Output configuration： NMOS
Package： SOT23，
SOT23-3，
SOT23-5，
SOT89-3，
TO-92
Selection Guide
Typical Application
battery checkers
Level selectors
Power failure detectors
Microcomputer reset
Battery backup of Memories
Store non-volatile RAM signal protectors
Package
● 3-pin SOT23、SOT23-3、SOT89-3、TO-92
● 5-pin SOT23-5
Typical Application Circuit
Vin
Vout
GND
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ME2808
Selection Guide
ME 28 08 X XX XX G
Environment mark
Package：
X：SOT23
P：SOT89-3
T：TO-92
M3：SOT23-3
M5：SOT23-5
Output Voltage
Function
Product Type
Product Series
Microne
product series
ME2808A25XG
ME2808A36XG
ME2808A22M3G
ME2808A33M3G
ME2808A60M3G
ME2808A30PG
ME2808A27TG
ME2808A42M5G
ME2808B28M3G
product description
V
OUT
=2.5V；Rising edge detection；Package：SOT23
V
OUT
=3.6V；Rising edge detection；Package：SOT23
V
OUT
=2.2V；Rising edge detection；Package：SOT23-3
V
OUT
=3.3V；Rising edge detection；Package：SOT23-3
V
OUT
=6.0V；Rising edge detection；Package：SOT23-3
V
OUT
=3.0V；Rising edge detection；Package：SOT89-3
V
OUT
=2.7V；Rising edge detection；Package：TO-92
V
OUT
=4.2V；Rising edge detection； Package：SOT23-5
V
OUT
=2.8V；Falling edge detection；Package：SOT23-3
NOTE:
At present ,there are eighteen kinds of voltage value: 2.2V、2.4V、2.5V、2.7V、2.8V、
3.0V、3.2V、3.3V、3.5V、3.6V、3.8V、3.9V、4.0V、4.2V、4.3V、4.5V、5.0V、6.0V。If you need
other voltage and package, please contact our sales staff.
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Page 2 of 12
ME2808
Pin Configuration
3
3
MARK
MARK
1
2
MARK
1
2
1 2 3
SOT23
SOT23-3
5
4
TO-92
MARK
1
2
3
1
MARK
2
3
SOT89-3
SOT23-5
Pin Assignment
Pin Number
SOT23
2
1
3
SOT23-3
2
1
3
SOT23-5
3
1
2
4
5
SOT89-3
3
1
2
TO-92
3
1
2
Pin Name
GND
V
OUT
V
IN
NC
NC
Functions
Ground
Output Voltage
Input Voltage
No Connection
No Connection
Block Diagram
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ME2808
Absolute Maximum Ratings
PARAMETER
V
IN
Input Voltage
Output Current
Output Voltage
NMOS
SOT23
Continuous Total Power
Dissipation
SOT23-3/5
SOT89-3
TO-92
Operating Ambient Temperature
Storage Temperature
Soldering temperature and time
T
Opr
T
stg
T
solder
P
D
SYMBAL
V
IN
I
OUT
V
OUT
RATINGS
18
50
GND-0.3~ V
IN
+0.3
250
300
mW
500
500
-40~+85
-50~+125
260℃, 10s
℃
℃
UNITS
V
mA
V
Electrical Characteristics
(
V
DET
=2.0V to 7.0V ,T
A
=25℃ ,unless otherwise noted)
Parameter
V
DET
V
HYS
Symbol
Detect
Voltage
Hysteresis
Width
V
DET
=2.0V~ 2.8V
I
IN
Operating
Current
V
DET
=2.8V~ 3.6V
V
DET
=3.6V ~ 4.7V
V
DET
=4.7V~ 7.0V
V
IN
Operating
Voltage
V
DET
=2.0V to 7.0V
V
DET
=2.0V~ 2.8V
V
DET
=2.8V~ 3.6V
V
DET
=3.6V ~ 4.7V
V
DET
=4.7V~ 7.0V
∆V
DET
/∆T
A
Temperature
characteristics
0℃≤T
opr
≤70℃
V
IN
=-V
DET(S)
-0.2
V , V
OUT
=0.2V
V
IN
=-V
DET(S)
-0.5
V , V
OUT
=0.3V
V
IN
=-V
DET(S)
-0.5
V , V
OUT
=0.3V
V
IN
=-V
DET(S)
-0.5
V , V
OUT
=0.3V
V
IN
=3.0V
V
IN
=4.0V
V
IN
=5.0V
V
IN
=8.0V
Conditions
Min.
V
DET
×0.99
V
DET
×0.02
-
-
-
-
0.7
0.5
0.5
1.2
2.5
±0.9
mV/℃
mA
Typ.
V
DET
V
DET
×0.05
1.8
1.8
2.1
2.5
-
Max.
V
DET
×1.01
V
DET
×0.1
3
4
4
4
18
V
μA
Units
V
V
I
OL
Output Sink
Current
Note:
1、VDF(S)
：Specified
Detection Voltage value
2、VDF
：Actual
Detection Voltage value
3、Release Voltage：VDR=VDF+VHYS (ME2808A series)
VDR=VDF-VHYS (ME2808B series)
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ME2808
Functional Description
The ME2808 series is a set of voltage detectors equipped with a high stability voltage reference which is
connected to the negative input of a comparator — denoted as V
REF
in the following figure (Fig. 1).When the voltage
drop to the positive input of the comparator (i,e,V
B
) is higher than V
REF
, V
OUT
goes high, M1 turns off, and V
B
is
ex-pressed as V
BH
=V
IN
×(R
B
+R
C
)/(R
A
+R
B
+R
C
).If V
IN
is decreased so that V
B
falls to a value that is less than V
REF
, the
comparator output inverts (from high to low), V
OUT
goes low, V
C
is high, M1 turns on, R
C
is bypassed, and V
B
becomes: V
BL
=V
IN
×R
B
/(R
A
+R
B
), which is less than V
BH
. By so doing the comparator out-put will stay low to prevent
the circuit from oscillating when V
B
≈
V
REF
. If V
IN
falls bellow the minimum operating voltage, the output becomes
undefined. When V
IN
goes from low to V
IN
×R
B
/(R
A
+R
B
) >V
REF
, the comparator output goes high and V
OUT
goes high
again. The detection voltage is as defined:
V
DET(–)
=( R
A
+R
B
+R
C
)×V
REF
/( R
B
+R
C
)
The release voltage is as defined:
V
DET(+)
=(R
A
+R
B
)×V
REF
/ R
B
The hysteresis width is:
V
HYS
=V
DET(+)
–V
DET(–)
Fig.1 demonstrates the NMOS output type with positive output polarity (V
OUT
is normally high, active low).
Fig.1 NMOS output voltage detector (ME2808)
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