19-1229; Rev 3; 9/02
Micropower, Low-Voltage, UCSP/SC70,
Rail-to-Rail I/O Comparators
General Description
The MAX985/MAX986/MAX989/MAX990/MAX993/
MAX994 single/dual/quad micropower comparators
feature low-voltage operation and Rail-to-Rail® inputs
and outputs. Their operating voltages range from 2.5V
to 5.5V, making them ideal for both 3V and 5V systems.
These comparators also operate with ±1.25V to ±2.75V
dual supplies. They consume only 11µA of supply cur-
rent while achieving a 300ns 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
MAX985/MAX989/MAX993 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 MAX986/MAX990/MAX994 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 MAX985 is available in a chip-scale pack-
age (UCSP™), significantly reducing the required PC
board area. The single MAX985/MAX986 are available
in 5-pin SC70 packages and the dual MAX989/MAX990
are available in 8-pin SOT23 packages.
____________________________Features
o
11µA Quiescent Supply Current
o
2.5V to 5.5V Single-Supply Operation
o
Common-Mode Input Voltage Range Extends
250mV Beyond the Rails
o
300ns Propagation Delay
o
Push-Pull Output Stage Sinks and Sources
8mA Current (MAX985/MAX989/MAX993)
o
Open-Drain Output Voltage Extends Beyond V
CC
(MAX986/MAX990/MAX994)
o
Unique Output Stage Reduces Output Switching
Current, Minimizing Overall Power Consumption
o
80µA Supply Current at 1MHz Switching
Frequency
o
No Phase Reversal for Overdriven Inputs
o
Available in Space-Saving Packages:
UCSP (MAX985)
SOT23 (MAX985/MAX986/MAX989/MAX990)
µMAX (MAX989/MAX990)
MAX985/MAX986/MAX989/MAX990/MAX993/MAX994
Ordering Information
PART
MAX985EBT-T*
MAX985EXK-T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN/BUMP-
PACKAGE
6 UCSP-6
5 SC70-5
TOP
MARK
AAY
ABK
Selector Guide
PART
MAX985
MAX986
MAX989
MAX990
MAX993
MAX994
COMPARATORS
PER PACKAGE
1
1
2
2
4
4
OUTPUT
STAGE
Push-Pull
Open-Drain
Push-Pull
Open-Drain
Push-Pull
Open-Drain
*UCSP
reliability is integrally linked to the user’s assembly meth-
ods, circuit board material, and environment. Refer to the UCSP
Reliability section of this data sheet for more information.
Ordering Information continued at end of data sheet.
Typical Application Circuit appears at end of data sheet.
Pin Configurations
TOP VIEW
(BUMPS ON BOTTOM)
IN+
B1
A1
V
EE
Applications
Portable/Battery-
Powered Systems
Mobile Communications
Zero-Crossing Detectors
Window Comparators
Level Translators
Threshold Detectors/
Discriminators
Ground/Supply-Sensing
Applications
IR Receivers
Digital Line Receivers
IN-
B2
MAX985
A2
OUT
N.C.
B3
A3
V
CC
UCSP
Pin Configurations continued at end of data sheet.
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
1
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________
Maxim Integrated Products
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.
Micropower, Low-Voltage, UCSP/SC70,
Rail-to-Rail I/O Comparators
MAX985/MAX986/MAX989/MAX990/MAX993/MAX994
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
MAX985/MAX989/MAX993 ....................-0.3V to (V
CC
+ 0.3V)
MAX986/MAX990/MAX994.....................................-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
6-Bump UCSP (derate 3.9mW/°C above +70°C)..........308mW
8-Pin SOT23 (derate 9.1mW/°C above +70°C).............727mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) ..............362mW
8-Pin SO (derate 5.88mW/°C above +70°C).................471mW
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
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Bump Reflow Temperature (Note 1) ................................+235°C
Note 1:
This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device
can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recom-
mended in the industry-standard specification, JEDEC 020A, paragraph 7.6,
Table
3 for IR/VPR and Convection Packaging
Reflow. Preheating is required. Hand or wave soldering is not allowed.
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
= 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.) (Note 2)
PARAMETER
Supply Voltage
Supply Current per
Comparator
Power-Supply Rejection Ratio
Common-Mode Voltage
Range (Note 3)
Input Offset Voltage
(Note 4)
Input Hysteresis
Input Bias Current
(Note 5)
Input Offset Current
Input Capacitance
Common-Mode Rejection Ratio
Output Leakage Current
(MAX986/MAX990/
MAX994 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
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
0.15
V
CC
= 5V
V
CC
= 2.7V
95
35
0.2
0.4
0.55
0.3
0.4
V
52
Full common-mode
range
T
A
= +25°C
T
A
= -40°C to +85°C
±3
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
11
MIN
2.5
12
TYP
MAX
5.5
20
24
20
24
dB
V
µA
UNITS
V
I
SC
mA
OUT Output Voltage Low
V
OL
2
_______________________________________________________________________________________
Micropower, Low-Voltage, UCSP/SC70,
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.) (Note 2)
PARAMETER
OUT Output Voltage High
(MAX985/MAX989/
MAX993 only)
OUT Rise Time
(MAX985/MAX989/
MAX993 only)
OUT Fall Time
SYMBOL
V
CC
= 5V,
I
SOURCE
= 8mA
V
CC
= 2.7V,
I
SOURCE
= 3.5mA
V
CC
= 5.0V
CONDITIONS
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
C
L
= 15pF
t
RISE
C
L
= 50pF
C
L
= 200pF
C
L
= 15pF
t
FALL
V
CC
= 5.0V
C
L
= 50pF
C
L
= 200pF
MAX985/MAX989/ 10mV overdrive
MAX993 only
100mV overdrive
t
PD-
Propagation Delay
C
L
= 15pF
MAX986/MAX990/ 10mV overdrive
MAX994 only,
R
PULLUP
= 5.1kΩ 100mV overdrive
10mV overdrive
100mV overdrive
MIN
4.6
4.45
2.4
2.3
40
50
80
40
50
80
450
300
450
ns
300
450
300
20
µs
ns
ns
2.55
TYP
4.85
V
MAX
UNITS
MAX985/MAX986/MAX989/MAX990/MAX993/MAX994
V
OH
t
PD+
Power-Up Time
t
PU
MAX985/MAX989/
MAX993 only, C
L
= 15pF
Note 2:
All device specifications are 100% production tested at T
A
= +25°C. Limits over the extended temperature range are guar-
anteed by design.
Note 3:
Inferred from the V
OS
test. Both or either inputs can be driven 0.3V beyond either supply rail without output phase reversal.
Note 4:
V
OS
is defined as the center of the hysteresis band at the input.
Note 5:
I
B
is defined as the average of the two input bias currents (I
B-
, I
B+
).
_______________________________________________________________________________________
3
Micropower, Low-Voltage, UCSP/SC70,
Rail-to-Rail I/O Comparators
MAX985/MAX986/MAX989/MAX990/MAX993/MAX994
__________________________________________Typical Operating Characteristics
(V
CC
= 5V, V
CM
= 0V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
MAX985-01
SUPPLY CURRENT vs.
OUTPUT TRANSITION FREQUENCY
MAX985-02
OUTPUT LOW VOLTAGE
vs. OUTPUT SINK CURRENT
V
IN+
< V
IN-
OUTPUT LOW VOLTAGE (mV) (V
OL
)
1000
V
CC
= 2.7V
100
MAX985-04
18
17
16
SUPPLY CURRENT (µA)
15
14
13
12
11
10
9
8
-60
V
IN+
> V
IN-
1000
10,000
SUPPLY CURRENT (µA)
100
V
CC
= 5.0V
V
CC
= 5.0V
10
V
CC
= 2.7V
V
CC
= 5.0V
V
CC
= 2.7V
10
-40
-20
0
20
40
60
80
100
1
0.01
0.1
1
10
100
1000
OUTPUT TRANSITION FREQUENCY (kHz)
1
0.01
0.1
1
10
100
OUTPUT SINK CURRENT (mA)
TEMPERATURE (°C)
OUTPUT HIGH VOLTAGE
vs. OUTPUT SOURCE CURRENT
MAX985-08
OUTPUT SHORT-CIRCUIT
CURRENT vs. TEMPERATURE
110
100
90
80
70
60
50
40
30
20
10
MAX985-06
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX985-07
10,000
OUTPUT HIGH VOLTAGE (V
CC
- V
OH
)
(mV)
V
IN+
> V
IN-
120
1.1
0.9
OFFSET VOLTAGE (mV)
0.7
0.5
0.3
0.1
-0.1
-0.3
OUTPUT SINK CURRENT (mA)
1000
V
CC
= 5.0V
100
V
CC
= 2.7V
V
CC
= 5.0V
10
1
V
CC
= 2.7V
0.1
0.01
0.1
1
10
100
OUTPUT SOURCE CURRENT (mA)
0
-60
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
-60
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
PROPAGATION DELAY
vs. CAPACITIVE LOAD (V
CC
= 3V)
MAX985-05a
PROPAGATION DELAY
vs. CAPACITIVE LOAD (V
CC
= 5V)
510
490
V
OD
= 50mV
MAX985-05b
600
V
OD
= 50mV
550
TO V
OUT
= 50% OF
FINAL VALUE
530
470
t
PD
(ns)
450
430
410
390
370
t
PD
(ns)
500
TO V
OUT
= 50% OF
FINAL VALUE
450
TO V
OUT
= 10% OF
FINAL VALUE
400
TO V
OUT
= 10% OF
FINAL VALUE
350
0
200
400
600
800
1000
CAPACITIVE LOAD (pF)
350
0
200
400
600
800
1000
CAPACITIVE LOAD (pF)
4
_______________________________________________________________________________________
Micropower, Low-Voltage, UCSP/SC70,
Rail-to-Rail I/O Comparators
____________________________Typical Operating Characteristics (continued)
(V
CC
= 5V, V
CM
= 0V, T
A
= +25°C, unless otherwise noted.)
PROPAGATION DELAY
vs. TEMPERATURE
MAX985-09
MAX985/MAX986/MAX989/MAX990/MAX993/MAX994
PROPAGATION DELAY
vs. INPUT OVERDRIVE
800
700
MAX985-10
450
V
OD
= 50mV
440
430
t
PD
(ns)
900
t
PD
(ns)
420
410
400
390
380
-40
-20
0
20
TO V
OUT
= 50% POINT
OF FINAL VALUE
600
500
400
300
200
100
V
CC
= 2.7V
V
CC
= 5.0V
TO V
OUT
= 10% POINT
OF FINAL VALUE
40
60
80
100
0
0
40
80
120
160
200
INPUT OVERDRIVE (mV)
TEMPERATURE (°C)
MAX985/MAX989/MAX993
PROPAGATION DELAY (t
PD+
)
MAX985-11
PROPAGATION DELAY (t
PD-
)
MAX985-12
MAX985/MAX989/MAX993
SWITCHING CURRENT, OUT RISING
MAX985-13
IN+
50mV/
div
IN+
50mV/
div
IN+
50mV/
div
2V/div
OUT
OUT
2V/div
OUT
2V/div
I
CC
V
OD
= 50mV
100ns/div
V
OD
= 50mV
V
OD
= 50mV
100ns/div
100ns/div
1mA/div
SWITCHING CURRENT, OUT FALLING
MAX985-14
1MHz RESPONSE
MAX985-15
POWER-UP DELAY
MAX985-16
IN+
OUT
50mV/
div
2V/div
IN+
50mV/
div
V
CC
I
CC
1mA/div
V
OD
= 50mV
100ns/div
OUT
2V/div
OUT
V
IN-
= 50mV
V
IN+
= 0V
V
OD
= 50mV
200ns/div
5µs/div
_______________________________________________________________________________________
5
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