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19-1721; Rev 2; 2/03
3-Pin, Ultra-Low-Power SC70/SOT23
Voltage Detectors
General Description
The MAX6375–MAX6380 are ultra-low-power circuits
used for monitoring battery, power-supply, and regulat-
ed system voltages. Each detector contains a precision
bandgap reference, comparator, and internally trimmed
resistors that set specified trip threshold voltages.
These devices provide excellent circuit reliability and
low cost by eliminating external components and
adjustments when monitoring nominal system voltages
from 2.5V to 5V.
These circuits perform a single function: they assert an
output signal whenever the V
CC
supply voltage falls
below a preset threshold. The devices are differentiated
by their output logic configurations and preset thresh-
old voltages. The MAX6375/MAX6378 (push-pull) and
MAX6377/MAX6380 (open-drain) have an active-low
output (OUT is logic low when V
CC
is below V
TH
). The
MAX6376/MAX6379 have an active-high push-pull out-
put (OUT is logic high when V
CC
is below V
TH
). All
parts are guaranteed to be in the correct output logic
state for V
CC
down to 1V. The detector is designed to
ignore fast transients on V
CC
. The MAX6375/MAX6376/
MAX6377 have voltage thresholds between 2.20V and
3.08V in approximately 100mV increments. The
MAX6378/MAX6379/MAX6380 have voltage thresholds
between 3.30V and 4.63V in approximately 100mV
increments.
Ultra-low supply current of 500nA (MAX6375/MAX6376/
MAX6377) makes these parts ideal for use in portable
equipment. All six devices are available in a space-sav-
ing SC70 package or in a tiny SOT23 package.
Features
o
Ultra-Low 500nA Supply Current
(MAX6375/MAX6376/MAX6377)
o
Thresholds Available from 2.20V to 4.63V in
Approximately 100mV Increments
o
±2.5% Threshold Accuracy Over Temperature
o
Low Cost
o
Available in Three Versions: Push-Pull
OUT,
Push-Pull OUT, and Open-Drain
OUT
o
Power-Supply Transient Immunity
o
No External Components
o
Available in Either a 3-Pin SC70
or 3-Pin SOT23 Package
MAX6375–MAX6380
Ordering Information
PART*
MAX6375UR
_ _ -T
MAX6375XR _ _ -T
MAX6376UR
_ _ -T
MAX6376XR _ _ -T
*
The
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
3 SOT23-3
3 SC70-3
3 SOT23-3
3 SC70-3
Applications
Precision Battery Monitoring
Load Switching/Power Sequencing
Power-Supply Monitoring in Digital/Analog Systems
Portable/Battery-Powered Equipment
MAX6375/MAX6376/MAX6377 are available in factory-pre-
set thresholds from 2.20V to 3.08V, in approximately 0.1V incre-
ments. The MAX6378/MAX6379/MAX6380 are available in
factory-preset thresholds from 3.30V to 4.63V, in approximately
0.1V increments. Choose the desired threshold suffix from
Table 1 and insert it in the blank spaces following R. There are
21 standard versions, with a required order increment of 2500
pieces. Sample stock is generally held on the standard versions
only (see the Selector Guide). The required order increment is
10,000 pieces for nonstandard versions (Table 2). Contact facto-
ry for availability. All devices available in tape-and-reel only.
Ordering information continued at end of data sheet
Pin Configuration
TOP VIEW
GND
1
MAX6375XR–
MAX6380XR
OUT(OUT)
1
3
V
CC
GND
2
MAX6375UR–
MAX6380UR
3
V
CC
Selector Guide appears at end of data sheet.
OUT(OUT)
2
SC70-3
( ) ARE FOR MAX6376/MAX6379 ONLY.
SOT23-3
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
3-Pin, Ultra-Low-Power SC70/SOT23
Voltage Detectors
MAX6375–MAX6380
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
V
CC
...........................................................................-0.3V to +6V
OUT,
OUT
(push-pull) ................................-0.3V to (V
CC
+ 0.3V)
OUT
(open-drain) .....................................................-0.3V to +6V
Input Current (V
CC
) .............................................................20mA
Output Current (OUT,
OUT)
................................................20mA
Continuous Power Dissipation (T
A
= +70°C)
3-Pin SC70 (derate 2.17mW/°C above +70°C) ...........174mW
3-Pin SOT23 (derate 4mW/°C above +70°C)..............320mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
CC
= full range, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C and V
CC
= 3V.) (Note 1)
PARAMETER
V
CC
Operating Range
SYMBOL
CONDITIONS
T
A
= 0°C to +70°C
T
A
= -40°C to +85°C
I
CC
MAX6375/76/77 only, V
CC
= 3.0V for V
TH
≤
2.93V,
V
CC
= 3.2V for V
TH
> 2.93V, no load
V
CC
= 5.5V, no load
T
A
= +25°C
Voltage Threshold
V
TH
Table 1
T
A
= -40°C to +85°C
Voltage Threshold Tempco
Propagation Delay
OUT
Output Voltage
(MAX6375/MAX6377/
MAX6378/MAX6380)
OUT
Output Voltage
(MAX6375/MAX6377)
∆V
TH
/°C
V
CC
= (V
TH
+ 100mV) to (V
TH
- 100mV)
V
CC
= (V
TH
- 100mV) to (V
TH
+ 100mV)
V
OL
I
SINK
= 1.6mA, V
CC
> 2.1V,
OUT
asserted
I
SINK
= 100µA, V
CC
≥
1.2V,
OUT
asserted
I
SOURCE
= 500µA, V
CC
= 3.2V, MAX6375 only
V
OH
I
SOURCE
= 800µA, V
CC
= 4.5V, V
TH
≤
4.38V
I
SOURCE
= 800µA, V
CC
= V
TH(MAX)
, V
TH
≥
4.5V
V
OH
OUT Output Voltage
(MAX6376/MAX6379)
V
OL
I
SOURCE
= 500µA, V
CC
≥
2.1V, OUT asserted
I
SOURCE
= 50µA, V
CC
≥
1.2V, OUT asserted
I
SINK
= 1.2mA, V
CC
≥
3.2V, OUT not asserted,
MAX6376 only
I
SINK
= 3.2mA, V
CC
≥
4.5V, OUT not asserted,
V
TH
≤
4.38V
I
SINK
= 3.2mA, V
CC
= V
TH(MAX)
, V
TH
≥
4.5V
Voltage Threshold
Hysteresis
Open-Drain
OUT
Output
Leakage Current
Note 1:
Production tested at +25°C only. Overtemperature limits are guaranteed by design, not production tested.
MAX6375/MAX6376/MAX6377
MAX6378/MAX6379/MAX6380
6.3
9.5
0.1
0.8
✕
V
CC
0.8
✕
V
CC
0.8
✕
V
CC
0.8
✕
V
CC
0.8
✕
V
CC
0.3
0.4
0.4
mV
µA
V
V
V
TH
- 2.5% V
TH
V
TH
+ 2.5%
40
20
42
0.3
V
0.4
ppm/°C
µs
MIN
1.0
1.2
0.5
1.0
TYP
MAX
5.5
5.5
1.0
1.75
UNITS
V
Supply Current
µA
V
TH
- 1.5% V
TH
V
TH
+ 1.5%
V
2
_______________________________________________________________________________________
3-Pin, Ultra-Low-Power SC70/SOT23
Voltage Detectors
__________________________________________Typical Operating Characteristics
(V
CC
= 5V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
0.9
0.8
SUPPLY CURRENT (µA)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
V
CC
= 1.2V
0
-40
-20
0
V
CC
= 3.3V
V
CC
= 5V
MAX6375-01
MAX6375–MAX6380
PROPAGATION DELAY (FALLING)
vs. TEMPERATURE
200
PROPAGATION DELAY (µs)
MAX6375-02
1.0
150
100
V
OD
= 20mV
V
OD
= 10mV
50
V
OD
= 100mV
V
OD
= 200mV
20
40
60
80
TEMPERATURE (°C)
PROPAGATION DELAY (RISING)
vs. TEMPERATURE
MAX6375-03
MAXIMUM TRANSIENT DURATION
vs. THRESHOLD OVERDRIVE
MAXIMUM TRANSIENT DURATION (µs)
MAX6375-04
140
120
PROPAGATION DELAY (µs)
100
80
60
40
20
0
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
V
OD
= 200mV
V
OD
= 100mV
V
OD
= 10mV
500
400
V
OD
= 20mV
300
200
OUT/OUT IS ASSERTED
ABOVE LINE
100
0
1
10
100
1000
THRESHOLD OVERDRIVE
V
TH
- V
CC
(mV)
Pin Description
PIN
MAX6375/MAX6377/
MAX6378/MAX6380
SC70-3
1
2
SOT23-3
2
1
MAX6376/MAX6379
SC70-3
1
—
SOT23-3
2
—
GND
OUT
Ground
Active-Low Output.
OUT
remains low while V
CC
is below the threshold.
OUT
is open-drain on the MAX6377/MAX6380 and push-pull on the
MAX6375/MAX6378.
Active-High Output. OUT remains high while V
CC
is below the
threshold.
Supply Voltage
NAME
FUNCTION
—
3
—
3
2
3
1
3
OUT
V
CC
______________________________________________________________________________________
3
3-Pin, Ultra-Low-Power SC70/SOT23
Voltage Detectors
MAX6375–MAX6380
____________ Applications Information
Interfacing to Different
Logic Voltage Components
The MAX6377/MAX6380 have an active-low, open-
drain output. This output structure sinks current when
OUT
is asserted. Connect a pullup resistor from
OUT
to
any supply voltage up to 5.50V (Figure 1). Select a
resistor value large enough to allow a valid logic low
(see
Electrical Characteristics),
and small enough to
register a logic high while supplying all input current
and leakage paths connected to the
OUT
line.
Negative-Going V
CC
Transients
These devices are relatively immune to short-duration,
negative-going V
CC
transients (glitches). The
Typical
Operating Characteristics
show the Maximum Transient
Duration vs. Threshold Overdrive graph, for which out-
put pulses are not generated. The graph shows the
maximum pulse width that a negative-going V
CC
tran-
sient may typically have before the devices issue out-
put signals. As the amplitude of the transient increases,
the maximum-allowable pulse width decreases.
V
IN
DC/DC
CONVERTER
V
OUT
REGULATED
3.0V
V
CC
3.6V
Li+
V
CC
OUT
µP
MAX6377
(OPEN-DRAIN)
SUSPEND
Figure 1. Interfacing to Different Logic Voltage Components
Table 1. Factory-Trimmed Reset Thresholds
‡
RESET THRESHOLD VOLTAGE, V
TH
(V)
PART
SUFFIX
MIN
22
23
24
MAX6375_R
MAX6376_R
MAX6377_R
25
26
27
28
29
30
31
2.167
2.285
2.364
2.462
2.591
2.660
2.758
2.886
2.955
3.034
T
A
= +25°C
TYP
2.200
2.320
2.400
2.500
2.630
2.700
2.800
2.930
3.000
3.080
MAX
2.233
2.355
2.436
2.537
2.669
2.741
2.842
2.974
3.045
3.126
T
A
= -40°C TO +85°C
MIN
2.145
2.262
2.340
2.437
2.564
2.633
2.730
2.857
2.925
3.003
MAX
2.250
2.375
2.460
2.562
2.696
2.768
2.870
3.000
3.075
3.150
‡
Factory-trimmed reset thresholds are available in approximately 100mV increments with a 1.5% room-temperature variance.
4
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