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General Description
The MAX917MAX920 nanopower comparators in
space-saving SOT23 packages feature Beyond-the-
RailsTM inputs and are guaranteed to operate down to
+1.8V. The MAX917/MAX918 feature an on-board
1.245V 1.5% reference and draw an ultra-low supply
current of only 750nA, while the MAX919/MAX920 (with-
out reference) require just 380nA of supply current.
These features make the MAX917MAX920 family of
comparators ideal for all 2-cell battery applications,
including monitoring/management.
The unique design of the output stage limits supply-cur-
rent surges while switching, virtually eliminating the
supply glitches typical of many other comparators. This
design also minimizes overall power consumption
under dynamic conditions. The MAX917/MAX919 have
a push/pull output stage that sinks and sources current.
Large internal output drivers allow Rail-to-Rail
output
swing with loads up to 8mA. The MAX918/MAX920
have an open-drain output stage that makes them suit-
able for mixed-voltage system design.
Applications
2-Cell Battery Monitoring/Management
Ultra-Low-Power Systems
Mobile Communications
Notebooks and PDAs
Threshold Detectors/Discriminators
Sensing at Ground or Supply Line
Telemetry and Remote Systems
Medical Instruments
Features
o
Ultra-Low Supply Current
380nA per Comparator (MAX919/MAX920)
750nA per Comparator with Reference
(MAX917/MAX918)
o
Guaranteed to Operate Down to +1.8V
o
Internal 1.245V 1.5% Reference
(MAX917/MAX918)
o
Input Voltage Range Extends 200mV
Beyond-the-Rails
o
CMOS Push/Pull Output with 8mA Drive
Capability (MAX917/MAX919)
o
Open-Drain Output Versions Available
(MAX918/MAX920)
o
Crowbar-Current-Free Switching
o
Internal Hysteresis for Clean Switching
o
No Phase Reversal for Overdriven Inputs
o
Space-Saving SOT23 Package
MAX917MAX920
SOT23, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
________________________________________________________________
Maxim Integrated Products
1
V
EE
IN- (REF)
IN+
1
5
V
CC
OUT
MAX917
MAX918
MAX919
MAX920
SOT23-5
TOP VIEW
2
3
4
( ) ARE FOR MAX917/MAX918.
PART
MAX917
EUK-T
MAX917ESA
-40C to +85C
-40C to +85C
TEMP.
RANGE
PIN-
PACKAGE
5 SOT23-5
8 SO
Pin Configurations continue at end of data sheet.
Typical Application Circuit appears at end of data sheet.
Pin Configurations
Selector Guide
Ordering Information
SOT
TOP MARK
ADIQ
--
MAX918
EUK-T
MAX918ESA
ADIR
-40C to +85C
-40C to +85C
5 SOT23-5
8 SO
--
MAX919
EUK-T
MAX919ESA
ADIS
-40C to +85C
-40C to +85C
5 SOT23-5
8 SO
--
MAX920
EUK-T
MAX920ESA
ADIT
-40C to +85C
-40C to +85C
5 SOT23-5
8 SO
--
Open-Drain
Yes
MAX918
750
380
380
750
SUPPLY
CURRENT
(nA)
Open-Drain
No
MAX920
PART
Push/Pull
No
MAX919
Push/Pull
Yes
MAX917
OUTPUT
TYPE
INTERNAL
REFERENCE
Beyond-the-Rails is a trademark of Maxim Integrated Products.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
19-1512; Rev 0; 7/99
MAX917MAX920
SOT23, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS--MAX917/MAX918
(V
CC
= +5V, V
EE
= 0, V
IN+
= V
REF
, T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
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.
Supply Voltage (V
CC
to V
EE
)..................................................+6V
Voltage Inputs (IN+, IN-, REF) .........(V
EE
- 0.3V) to (V
CC
+ 0.3V)
Output Voltage
MAX917/MAX919 ........................(V
EE
- 0.3V) to (V
CC
+ 0.3V)
MAX918/MAX920 ......................................(V
EE
- 0.3V) to +6V
Output Current..................................................................50mA
Output Short-Circuit Duration .............................................10sec
Continuous Power Dissipation (T
A
= +70C)
5-Pin SOT23 (derate 7.31mW/C above +70C).........571mW
8-Pin SO (derate 5.88mW/C above +70C)...............471mW
Operating Temperature Range ...........................-40C to +85C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10sec) .............................+300C
V
CC
= 1.8V
V
CC
= 1.8V
V
CC
= 5V
V
CC
= 1.8V
V
CC
= 5V
Output Voltage Swing Low
V
OL
190
400
mV
500
55
200
T
A
= T
MIN
to T
MAX
T
A
= +25C
300
V
CC
= 5V,
I
SINK
= 8mA
T
A
= T
MIN
to T
MAX
V
CC
= 1.8V,
I
SINK
= 1mA
T
A
= +25C
T
A
= T
MIN
to T
MAX
T
A
= +25C
T
A
= T
MIN
to T
MAX
T
A
= +25C
T
A
= T
MIN
to T
MAX
T
A
= +25C
T
A
= T
MIN
to T
MAX
T
A
= +25C
T
A
= T
MIN
to T
MAX
T
A
= +25C
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
10
Input Offset Voltage
V
OS
1
5
mV
IN+ Voltage Range
V
IN+
V
EE
- 0.2
V
CC
+ 0.2
V
1.60
Input-Referred Hysteresis
V
HB
4
mV
Input Bias Current
I
B
0.15
1
nA
2
Power-Supply Rejection Ratio
PSRR
0.1
1
mV/V
Supply Current
Supply Voltage Range
V
CC
1.8
5.5
V
I
CC
0.75
A
0.80
1.30
Output Voltage Swing High
V
CC
- V
OH
190
400
mV
500
55
200
300
Output Leakage Current
I
LEAK
0.001
1
A
Output Short-Circuit Current
I
SC
95
mA
8
98
10
CONDITIONS
MAX917 only, V
CC
=
5V, I
SOURCE
= 8mA
(Note 2)
Inferred from the output swing test
(Note 3)
MAX917 only, V
CC
=
1.8V, I
SOURCE
= 1mA
V
CC
= 1.8V to 5.5V
MAX918 only, V
O
= 5.5V
Sourcing, V
O
= V
EE
Inferred from the PSRR test
Sinking, V
O
= V
CC
V
CC
= 5V
MAX917MAX920
SOT23, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS--MAX919/MAX920
(V
CC
= +5V, V
EE
= 0, V
CM
= 0, T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
V
CC
= 1.8V
V
CC
= 5V
Inferred from the PSRR test
-0.2V
V
CM
(V
CC
+ 0.2V) (Note 3)
T
A
= +25C
Inferred from the CMRR test
-0.2V
V
CM
(V
CC
+ 0.2V) (Note 2)
T
A
= +25C
CONDITIONS
T
A
= T
MIN
to T
MAX
0.45
0.80
A
0.38
I
CC
V
1.8
5.5
V
CC
Supply Voltage Range
Supply Current
nA
0.15
1
I
B
Input Bias Current
mV
4
V
HB
Input-Referred Hysteresis
1.2
T
A
= +25C
V
V
EE
- 0.2
V
CC
+ 0.2
V
CM
Input Common-Mode
Voltage Range
mV
1
5
V
OS
Input Offset Voltage
10
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
T
A
= T
MIN
to T
MAX
2
T
A
= T
MIN
to T
MAX
V
CC
= 5V,
R
PULL-UP
= 100k
V
CC
= 1.8V,
R
PULL-UP
= 100k
V
CC
= 5V
V
CC
= 1.8V
V
CC
= 1.8V
MAX917 only
95
s
30
t
PD+
Low-to-High Propagation Delay
(Note 4)
35
MAX918 only
120
s
95
CONDITIONS
T
A
= +25C
ms
1.2
22
17
t
PD-
High-to-Low Propagation Delay
(Note 4)
t
ON
Power-Up Time
I
OUT
= 10nA
mV/nA
0.2
V
REF
/
I
OUT
Reference Load Regulation
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
C
L
= 15pF
1.8V
V
CC
5.5V
BW = 10Hz to 100kHz, C
REF
= 1nF
MAX917 only, C
L
= 15pF
V
CC
= 5V
BW = 10Hz to 100kHz
T
A
= T
MIN
to T
MAX
mV/V
0.1
V
REF
/
V
CC
Reference Line Regulation
215
V
RMS
e
n
Reference Output
Voltage Noise
1.200
1.290
V
1.227
1.245
1.263
V
REF
Reference Voltage
s
4
t
FALL
Fall Time
s
6
t
RISE
Rise Time
ppm/C
TC
REF
Reference Voltage Temperature
Coefficient
600
ELECTRICAL CHARACTERISTICS--MAX917/MAX918 (continued)
(V
CC
= +5V, V
EE
= 0, V
IN+
= V
REF
, T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
MAX917MAX920
SOT23, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS--MAX919/MAX920 (continued)
(V
CC
= +5V, V
EE
= 0, V
CM
= 0, T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
Note 1:
All specifications are 100% tested at T
A
= +25C. Specification limits over temperature (T
A
= T
MIN
to T
MAX
) are guaranteed
by design, not production tested.
Note 2:
V
OS
is defined as the center of the hysteresis band at the input.
Note 3:
The hysteresis-related trip points are defined as the edges of the hysteresis band, measured with respect to the center of
the band (i.e., V
OS
) (Figure 2).
Note 4:
Specified with an input overdrive (V
OVERDRIVE
) of 100mV, and load capacitance of C
L
= 15pF. V
OVERDRIVE
is defined
above and beyond the offset voltage and hysteresis of the comparator input. For the MAX917/MAX918, reference voltage
error should also be added.
Sinking, V
O
= V
CC
Sourcing, V
O
= V
EE
MAX920 only, V
O
= 5.5V
T
A
= +25C
T
A
= +25C
MAX919 only, V
CC
=
1.8V, I
SOURCE
= 1mA
T
A
= T
MIN
to T
MAX
V
CC
= 1.8V,
I
SINK
= 1mA
MAX919 only, V
CC
=
5V, I
SOURCE
= 8mA
CONDITIONS
ms
1.2
10
t
ON
Power-Up Time
98
8
mA
95
I
SC
Output Short-Circuit Current
A
0.001
1
I
LEAK
Output Leakage Current
T
A
= T
MIN
to T
MAX
300
T
A
= +25C
T
A
= T
MIN
to T
MAX
V
CC
= 5V,
I
SINK
= 8mA
55
200
300
T
A
= +25C
T
A
= T
MIN
to T
MAX
500
55
200
500
mV
190
400
V
CC
- V
OH
Output Voltage Swing High,
pA
10
I
OS
Input Offset Current
mV
190
400
V
OL
Output Voltage Swing Low
V
CC
= 5V
V
CC
= 1.8V
V
CC
= 5V
V
CC
= 1.8V
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
MAX919 only, C
L
= 15pF
s
6
t
RISE
High-to-Low Propagation Delay
(Note 4)
Rise Time
s
17
t
PD-
V
CC
= 1.8V to 5.5V
mV/V
0.1
1
PSRR
Power-Supply Rejection Ratio
(V
EE
- 0.2V)
V
CM
(V
CC
+ 0.2V)
mV/V
0.5
3
CMRR
Common-Mode Rejection Ratio
22
V
CC
= 1.8V
V
CC
= 5V
MAX919 only
Low-to-High Propagation Delay
(Note 4)
s
30
t
PD+
V
CC
= 5V
V
CC
= 1.8V
95
MAX920 only
V
CC
= 1.8V
R
PULL-UP
= 100k
35
V
CC
= 5V
R
PULL-UP
= 100k
120
C
L
= 15pF
s
4
t
FALL
Fall Time
MAX917MAX920
SOT23, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
_______________________________________________________________________________________
5
500
600
700
800
900
1.5
2.5
3.5
4.5
2.0
3.0
4.0
5.0
5.5
MAX917/MAX918
SUPPLY CURRENT vs.
SUPPLY VOLTAGE AND TEMPERATURE
MAX917-920 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (nA)
T
A
= +85C
T
A
= +25C
T
A
= -40C
300
400
500
600
1.5
2.5
3.5
4.5
2.0
3.0
4.0
5.0
5.5
MAX919/MAX920
SUPPLY CURRENT vs.
SUPPLY VOLTAGE AND TEMPERATURE
MAX917-920 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (nA)
T
A
= +85C
T
A
= +25C
T
A
= -40C
500
550
600
650
700
750
800
850
900
-40
-15
10
35
60
85
MAX917/MAX918
SUPPLY CURRENT vs. TEMPERATURE
MAX917-920 toc03
TEMPERATURE (C)
SUPPLY CURRENT (nA)
V
CC
= 3V
V
CC
= 5V
V
CC
= 1.8V
300
350
400
450
500
550
-40
-15
10
35
60
85
MAX919/MAX920
SUPPLY CURRENT vs. TEMPERATURE
MAX917-920 toc04
TEMPERATURE (C)
SUPPLY CURRENT (nA)
V
CC
= 3V
V
CC
= 5V
V
CC
= 1.8V
0
100
50
250
200
150
400
350
300
450
0
6
8
2
4
10
12
14
16
OUTPUT VOLTAGE LOW vs. SINK CURRENT
MAX917-920 toc07
SINK CURRENT (mA)
V
OL
(mV)
V
CC
= 1.8V
V
CC
= 3V
V
CC
= 5V
10
12
14
16
0
1
10
100
1k
10k
100k
MAX917/MAX918
SUPPLY CURRENT vs.
OUTPUT TRANSITION FREQUENCY
2
MAX917-920 toc05
OUTPUT TRANSITION FREQUENCY (Hz)
SUPPLY CURRENT (
A)
4
6
8
V
CC
= 1.8V
V
CC
= 3V
V
CC
= 5V
10
12
14
0
1
10
100
1k
10k
100k
MAX919/MAX920
SUPPLY CURRENT vs.
OUTPUT TRANSITION FREQUENCY
2
MAX917-920 toc06
OUTPUT TRANSITION FREQUENCY (Hz)
SUPPLY CURRENT (
A)
4
6
8
V
CC
= 1.8V
V
CC
= 3V
V
CC
= 5V
0
100
200
500
400
300
600
0
6
8
2
4
10
12
14
16
OUTPUT VOLTAGE LOW vs. SINK CURRENT
AND TEMPERATURE
MAX917-920 toc08
SINK CURRENT (mA)
V
OL
(mV)
T
A
= +25C
T
A
= -40C
T
A
= +85C
0
0.3
0.2
0.1
0.4
0.5
0.6
0
8
6
2
4
10 12 14 16 18 20
MAX917/MAX919
OUTPUT VOLTAGE HIGH vs. SOURCE CURRENT
MAX917-920 toc09
SOURCE CURRENT (mA)
V
CC
- V
OH
(V)
V
CC
= 1.8V
V
CC
= 3V
V
CC
= 5V
Typical Operating Characteristics
(V
CC
= +5V, V
EE
= 0, C
L
= 15pF, V
OVERDRIVE
= 100mV, T
A
= +25C, unless otherwise noted.)
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