19-1266; Rev 1; 1/01
High-Speed, Micropower, Low-Voltage,
SOT23, Rail-to-Rail I/O Comparators
________________General Description
The MAX987/MAX988/MAX991/MAX992/MAX995/
MAX996 single/dual/quad micropower comparators
feature low-voltage operation and Rail-to-Rail® inputs
and outputs. Their operating voltage ranges from +2.5V
to +5.5V, making them ideal for both 3V and 5V sys-
tems. These comparators also operate with ±1.25V to
±2.75V dual supplies. They consume only 48µA per
comparator while achieving a 120ns propagation delay.
Input bias current is typically 1.0pA, and input offset
voltage is typically 0.5mV. Internal hysteresis ensures
clean output switching, even with slow-moving input
signals.
The output stage’s unique design limits supply-current
surges while switching, virtually eliminating the supply
glitches typical of many other comparators. The
MAX987/MAX991/MAX995 have a push/pull output
stage that sinks as well as sources current. Large inter-
nal output drivers allow rail-to-rail output swing with
loads up to 8mA. The MAX988/MAX992/MAX996 have
an open-drain output stage that can be pulled beyond
V
CC
to 6V (max) above V
EE
. These open-drain versions
are ideal for level translators and bipolar to single-
ended converters.
The single MAX987/MAX988 are available in tiny 5-pin
SC70 packages, while the dual MAX991/MAX992 are
available in ultra-small 8-pin SOT23 packages.
____________________________Features
o
120ns Propagation Delay
o
48µA Quiescent Supply Current
o
+2.5V to +5.5V Single-Supply Operation
o
Common-Mode Input Voltage Range Extends
250mV Beyond the Rails
o
Push/Pull Output Stage Sinks and Sources
8mA Current (MAX987/MAX991/MAX995)
o
Open-Drain Output Voltage Extends Beyond V
CC
(MAX988/MAX992/MAX996)
o
Unique Output Stage Reduces Output Switching
Current, Minimizing Overall Power Consumption
o
100µA Supply Current at 1MHz Switching
Frequency
o
No Phase Reversal for Overdriven Inputs
o
Available in Space-Saving Packages:
5-Pin SOT23 (MAX987/MAX988)
8-Pin
µ
MAX (MAX991/MAX992)
MAX987/MAX988/MAX991/MAX992/MAX995/MAX996
_______________Ordering Information
PART
MAX987EXK-T
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
5 SC70-5
5 SOT23-5
8 SO
TOP
MARK
ABM
ABZB
—
Selector Guide
PART
MAX987
MAX988
MAX991
MAX992
MAX995
MAX996
COMPARATORS
PER PACKAGE
1
1
2
2
4
4
OUTPUT
STAGE
Push/Pull
Open-Drain
Push/Pull
Open-Drain
Push/Pull
Open-Drain
MAX987EUK-T
MAX987ESA
Ordering Information continued at end of data sheet.
Typical Application Circuit appears at end of data sheet.
Pin Configurations
TOP VIEW
OUT 1
5
V
EE
Applications
Portable/Battery-
Powered Systems
Mobile Communications
Zero-Crossing Detectors
Window Comparators
Level Translators
Threshold Detectors/
Discriminators
Ground/Supply Sensing
IR Receivers
Digital Line Receivers
V
CC
2
MAX987
MAX988
4
IN-
IN+ 3
SOT23/SC70
Pin Configurations continued at end of data sheet.
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
1
________________________________________________________________
Maxim Integrated Products
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
High-Speed, Micropower, Low-Voltage,
SOT23, Rail-to-Rail I/O Comparators
MAX987/MAX988/MAX991/MAX992/MAX995/MAX996
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
to V
EE
) ...................................................6V
IN_-, IN_+ to V
EE
.......................................-0.3V to (V
CC
+ 0.3V)
OUT_ to V
EE
MAX987/MAX991/MAX995 ....................-0.3V to (V
CC
+ 0.3V)
MAX988/MAX992/MAX996.....................................-0.3V to 6V
OUT_ Short-Circuit Duration to V
EE
or V
CC
...........................10s
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SC70 (derate 3.1mW/°C above +70°C) ...............247mW
5-Pin SOT23 (derate 7.10mW/°C above +70°C)...........571mW
8-Pin SOT23 (derate 9.1mW/°C above +70°C).............727mW
8-Pin SO (derate 5.88mW/°C above +70°C).................471mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) ..............362mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C) ..........727mW
14-Pin SO (derate 8.33mW/°C above +70°C)...............667mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +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 (Note 1)
(V
CC
= +2.7V to +5.5V, V
EE
= 0V, V
CM
= 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Supply Voltage
Supply Current per
Comparator
Power-Supply Rejection Ratio
Common-Mode Voltage
Range (Note 2)
Input Offset Voltage
(Note 3)
Input Hysteresis
Input Bias Current
(Note 4)
Input Offset Current
Input Capacitance
Common-Mode Rejection Ratio
Output Leakage Current
(MAX988/MAX992/
MAX996 only)
Output Short-Circuit Current
SYMBOL
V
CC
CONDITIONS
Inferred from PSRR test
V
CC
= 5V
I
CC
V
CC
= 2.7V
PSRR
V
CMR
2.5V
≤
V
CC
≤
5.5V
T
A
= +25°C
T
A
= -40°C to +85°C
V
OS
V
HYST
I
B
I
OS
C
IN
CMRR
I
LEAK
V
OUT
= high
Sourcing or sinking,
V
OUT
= V
EE
or V
CC
V
CC
= 5V,
I
SINK
= 8mA
V
CC
= 2.7V,
I
SINK
= 3.5mA
V
CC
= 5V,
I
SOURCE
= 8mA
V
CC
= 2.7V,
I
SOURCE
= 3.5mA
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
4.6
4.45
2.4
2.3
2.55
4.85
V
0.15
V
CC
= 5V
V
CC
= 2.7V
95
35
0.2
0.4
0.55
0.3
0.4
V
50
Full common-mode
range
T
A
= +25°C
T
A
= -40°C to +85°C
±2.5
0.001
0.5
1.0
80
1.0
10
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
55
V
EE
-
0.25
V
EE
±0.5
80
V
CC
+
0.25
V
CC
±5
±7
mV
mV
nA
pA
pF
dB
µA
48
MIN
2.5
53
TYP
MAX
5.5
80
96
80
96
dB
V
µA
UNITS
V
I
SC
mA
OUT Output Voltage Low
V
OL
OUT Output Voltage High
(MAX987/MAX991/
MAX995 only)
V
OH
2
_______________________________________________________________________________________
High-Speed, Micropower, Low-Voltage,
SOT23, Rail-to-Rail I/O Comparators
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.7V to +5.5V, V
EE
= 0V, V
CM
= 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
OUT Rise Time
(MAX987/MAX991/
MAX995 only)
OUT Fall Time
SYMBOL
t
RISE
V
CC
= 5.0V
CONDITIONS
C
L
= 15pF
C
L
= 50pF
C
L
= 200pF
C
L
= 15pF
t
FALL
V
CC
= 5.0V
C
L
= 50pF
C
L
= 200pF
MAX987/MAX991/ 10mV overdrive
MAX995 only
100mV overdrive
t
PD-
Propagation Delay
C
L
= 15pF,
MAX988/MAX992/ 10mV overdrive
V
CC
= 5V
MAX996 only,
R
PULL-UP
= 5.1kΩ 100mV overdrive
MAX987/MAX991/MAX995
only, C
L
= 15pF, V
CC
= 5V
10mV overdrive
100mV overdrive
MIN
TYP
15
20
40
15
20
40
210
120
210
ns
120
210
120
25
µs
ns
ns
MAX
UNITS
MAX987/MAX988/MAX991/MAX992/MAX995/MAX996
t
PD+
Power-Up Time
t
PU
Note 1:
All device specifications are 100% production tested at T
A
= +25°C. Limits over the extended temperature range are guar-
anteed by design, not production tested.
Note 2:
Inferred from the V
OS
test. Either or both inputs can be driven 0.3V beyond either supply rail without output phase reversal.
Note 3:
V
OS
is defined as the center of the hysteresis band at the input.
Note 4:
I
B
is defined as the average of the two input bias currents (I
B-
, I
B+
).
_______________________________________________________________________________________
3
High-Speed, Micropower, Low-Voltage,
SOT23, Rail-to-Rail I/O Comparators
MAX987/MAX988/MAX991/MAX992/MAX995/MAX996
Typical Operating Characteristics
(V
CC
= +5V, V
CM
= 0, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT PER COMPARATOR
vs. TEMPERATURE
MAX9879 TOC1
SUPPLY CURRENT PER COMPARATOR
vs. OUTPUT TRANSITION FREQUENCY
MAX987 TOC2
90
V
IN+
> V
IN-
80
SUPPLY CURRENT (µA)
70
V
CC
= 5.5.V
60
50
40
30
-60
-40
-20
0
20
40
60
80
V
CC
= 2.5.V
1000
SUPPLY CURRENT (µA)
V
CC
= 5.5V
100
V
CC
= 2.5V
10
100
0.01
0.1
1
10
100
1000 10,000
TEMPERATURE (°C)
OUTPUT TRANSITION FREQUENCY (kHz)
OUTPUT HIGH VOLTAGE
vs. OUTPUT SOURCE CURRENT
MAX987-04
OUTPUT LOW VOLTAGE
vs. OUTPUT SINK CURRENT
V
IN+
< V
IN-
OUTPUT LOW VOLTAGE (mV) (V
OL
)
1000
V
CC
= 2.7V
100
MAX987-03a
10,000
V
IN+
> V
IN-
1000
OUTPUT HIGH VOLTAGE
(mV) (V
CC
- V
OH
)
10,000
100
V
CC
= 2.7V
V
CC
= 5.0V
10
V
CC
= 5.0V
1
10
0.1
0.01
0.1
1
10
100
OUTPUT SOURCE CURRENT (mA)
1
0.01
0.1
1
10
100
OUTPUT SINK CURRENT (mA)
OUTPUT SHORT-CIRCUIT
CURRENT vs. TEMPERATURE
MAX987 05
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX987 06
120
110
100
90
80
70
60
50
40
30
20
10
0
-60
-40
-20
0
20
40
60
80
1.1
0.9
OFFSET VOLTAGE (mV)
0.7
0.5
0.3
0.1
-0.1
-0.3
OUTPUT SINK CURRENT (mA)
V
CC
= 5.0V
V
CC
= 2.7V
100
-60
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
High-Speed, Micropower, Low-Voltage,
SOT23, Rail-to-Rail I/O Comparators
Typical Operating Characteristics
(V
CC
= +5V, V
CM
= 0, T
A
= +25°C, unless otherwise noted.)
PROPAGATION DELAY
vs. CAPACITIVE LOAD
MAX987 TOC8
MAX987/MAX988/MAX991/MAX992/MAX995/MAX996
PROPAGATION DELAY
vs. TEMPERATURE
190
PROPAGATION DELAY (ns)
180
170
160
150
140
130
120
110
V
CC
= 5.5.V
V
CC
= 2.5.V
V
OD
= 50mV
MAX987 TOC9
10,000
V
OD
= 50mV
PROPAGATION DELAY (ns)
200
1000
100
0.01
100
0.1
1
10
100
1000
-60
-40
-20
0
20
40
60
80
100
CAPACITIVE LOAD (nF)
TEMPERATURE (°C)
PROPAGATION DELAY
vs. INPUT OVERDRIVE
MAX987 TOC10
MAX987/MAX991/MAX995
PROPAGATION DELAY (t
PD+
)
MAX987-11
300
250
PROPAGATION DELAY (ns)
200
V
CC
= 2.5V
150
100
50
0
0
20
40
60
80
100
120
V
CC
= 5.5V
V
OD
= 50mV
IN+
50mV/
div
OUT
2V/div
140
100ns/div
INPUT OVERDRIVE (mV)
PROPAGATION DELAY (t
PD-
)
MAX987-12
MAX987/MAX991/MAX995
SWITCHING CURRENT, OUT RISING
MAX987-13
V
OD
= 50mV
IN+
50mV/
div
IN+
50mV/
div
2V/div
OUT
OUT
2V/div
I
CC
2mA/div
V
OD
= 50mV
100ns/div
200ns/div
_______________________________________________________________________________________
5
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