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MAX985ESA+-MAX985EUK+T-MAX985EXK+T-MAX989ESA+-MAX989EUA+-MAX989EUA-T-MAX990EKA+T-MAX990ESA+-MAX990EUA+-MAX993ESD+-MAX993EUD+-MAX993EUD+T-MAX994ESD+-MAX994EUD-MAX994EUD+
Micropower, Low-Voltage, UCSP/SC70, Rail-to-Rail I/O Comparators
General DescriptionThe 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
VCCto 6V (max) above VEE. 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.
____________________________Features11µA Quiescent Supply Current2.5V to 5.5V Single-Supply OperationCommon-Mode Input Voltage Range Extends
250mV Beyond the Rails300ns Propagation DelayPush-Pull Output Stage Sinks and Sources
8mA Current (MAX985/MAX989/MAX993)Open-Drain Output Voltage Extends Beyond VCC
(MAX986/MAX990/MAX994)Unique Output Stage Reduces Output Switching
Current, Minimizing Overall Power Consumption80µA Supply Current at 1MHz Switching
Frequency No Phase Reversal for Overdriven InputsAvailable in Space-Saving Packages:
UCSP (MAX985)
SOT23 (MAX985/MAX986/MAX989/MAX990)
µMAX (MAX989/MAX990)
MAX985/MAX986/MAX989/MAX990/MAX993/MAX994
Micropower, Low-Voltage, UCSP/SC70,
Rail-to-Rail I/O Comparators
Pin Configurations19-1229; Rev 3; 9/02
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
ApplicationsUCSP is a trademark of Maxim Integrated Products, Inc.
*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.
MAX985/MAX986/MAX989/MAX990/MAX993/MAX994
Micropower, Low-Voltage, UCSP/SC70,
Rail-to-Rail I/O Comparators
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= 2.7V to 5.5V, VEE= 0V, VCM= 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
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 (VCCto VEE) ...................................................6V
IN_-, IN_+ to VEE.......................................-0.3V to (VCC+ 0.3V)
OUT_ to VEE
MAX985/MAX989/MAX993....................-0.3V to (VCC+ 0.3V)
MAX986/MAX990/MAX994.....................................-0.3V to 6V
OUT_ Short-Circuit Duration to VEEor VCC...........................10s
Continuous Power Dissipation (TA= +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, Table3 for IR/VPR and Convection Packaging
Reflow. Preheating is required. Hand or wave soldering is not allowed.
MAX985/MAX986/MAX989/MAX990/MAX993/MAX994
Micropower, Low-Voltage, UCSP/SC70,
Rail-to-Rail I/O Comparators
ELECTRICAL CHARACTERISTICS (continued)(VCC= 2.7V to 5.5V, VEE= 0V, VCM= 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
Note 2:All device specifications are 100% production tested at TA= +25°C. Limits over the extended temperature range are guar-
anteed by design.
Note 3:Inferred from the VOStest. Both or either inputs can be driven 0.3V beyond either supply rail without output phase reversal.
Note 4:VOSis defined as the center of the hysteresis band at the input.
Note 5:IBis defined as the average of the two input bias currents (IB-, IB+).
MAX985/MAX986/MAX989/MAX990/MAX993/MAX994
Micropower, Low-Voltage, UCSP/SC70,
Rail-to-Rail I/O Comparators
__________________________________________Typical Operating Characteristics
MAX985/MAX986/MAX989/MAX990/MAX993/MAX994
Micropower, Low-Voltage, UCSP/SC70,
Rail-to-Rail I/O Comparators
MAX985/MAX989/MAX993
SWITCHING CURRENT, OUT RISINGIN+
OUT
ICC
MAX985-13
100ns/div
50mV/
div
2V/div
1mA/div
SWITCHING CURRENT, OUT FALLINGIN+
OUT
ICC
MAX985-14
100ns/div
50mV/div
2V/div
1mA/div
1MHz RESPONSEIN+
OUT
MAX985-15
200ns/div
50mV/
div
2V/div
POWER-UP DELAYVCC
OUT
MAX985-16
5µs/div
PROPAGATION DELAY
vs. INPUT OVERDRIVE
MAX985-10
INPUT OVERDRIVE (mV)
PD
(ns)
PROPAGATION DELAY
vs. TEMPERATURE
MAX985-09
TEMPERATURE (°C)
tPD
(ns)
MAX985/MAX989/MAX993
PROPAGATION DELAY (tPD+)
IN+
OUT
MAX985-11
100ns/div
50mV/
div
2V/div
____________________________Typical Operating Characteristics (continued)(VCC= 5V, VCM= 0V, TA= +25°C, unless otherwise noted.)
MAX985/MAX986/MAX989/MAX990/MAX993/MAX994
Micropower, Low-Voltage, UCSP/SC70,
Rail-to-Rail I/O Comparators
Pin Description*MAX985 only
MAX985/MAX986/MAX989/MAX990/MAX993/MAX994
Micropower, Low-Voltage, UCSP/SC70,
Rail-to-Rail I/O Comparators
_______________Detailed DescriptionThe MAX985/MAX986/MAX989/MAX990/MAX993/
MAX994 are single/dual/quad low-power, low-voltage
comparators. They have an operating supply voltage
range between 2.5V and 5.5V and consume only 11µA.
Their common-mode input voltage range extends 0.25V
beyond each rail. Internal hysteresis ensures clean out-
put switching, even with slow-moving input signals.
Large internal output drivers allow rail-to-rail output
swing with up to 8mA loads.
The output stage employs a unique design that mini-
mizes supply-current surges while switching, virtually
eliminating the supply glitches typical of many other
comparators. The MAX985/MAX989/MAX993 have a
push-pull output structure that sinks as well as sources
current. The MAX986/MAX990/MAX994 have an open-
drain output stage that can be pulled beyond VCCto an
absolute maximum of 6V above VEE.
Input Stage CircuitryThe devices’ input common-mode range extends from
-0.25V to (VCC+ 0.25V). These comparators may oper-
ate at any differential input voltage within these limits.
Input bias current is typically 1.0pA if the input voltage
is between the supply rails. Comparator inputs are pro-
tected from overvoltage by internal body diodes con-
nected to the supply rails. As the input voltage exceeds
the supply rails, these body diodes become forward
biased and begin to conduct. Consequently, bias cur-
rents increase exponentially as the input voltage
exceeds the supply rails.
Output Stage CircuitryThese comparators contain a unique output stage
capable of rail-to-rail operation with up to 8mA loads.
Many comparators consume orders of magnitude more
current during switching than during steady-state oper-
ation. However, with this family of comparators, the
supply-current change during an output transition is
extremely small. The Typical Operating Characteristics
graph Supply Current vs. Output Transition Frequency
shows the minimal supply-current increase as the out-
put switching frequency approaches 1MHz. This char-
acteristic eliminates the need for power-supply filter
capacitors to reduce glitches created by comparator
switching currents. Another advantage realized in high-
speed, battery-powered applications is a substantial
increase in battery life.
__________Applications Information
Additional Hysteresis
MAX985/MAX989/MAX993The MAX985/MAX989/MAX993 have ±3mV internal
hysteresis. Additional hysteresis can be generated with
three resistors using positive feedback (Figure 1).
Unfortunately, this method also slows hysteresis
response time. Use the following procedure to calcu-
late resistor values for the MAX985/MAX989/MAX993.Select R3. Leakage current at IN is under 10nA, so
the current through R3 should be at least 1µA to
minimize errors caused by leakage current. The cur-
rent through R3 at the trip point is (VREF- VOUT) /
R3. Considering the two possible output states in
solving for R3 yields two formulas: R3 = VREF/ 1µA
or R3 = (VREF- VCC) / 1µA. Use the smaller of the
two resulting resistor values. For example, if VREF=
1.2V and VCC= 5V, then the two R3 resistor values
are 1.2MΩand 3.8MΩ. Choose a 1.2MΩstandard
value for R3.Choose the hysteresis band required (VHB). For this
example, choose 50mV.Calculate R1 according to the following equation:
R1 = R3 x (VHB/ VCC)
For this example, insert the values R1 = 1.2MΩx
(50mV / 5V) = 12kΩ.Choose the trip point for VINrising (VTHR; VTHFis
the trip point for VINfalling). This is the threshold
voltage at which the comparator switches its output
from low to high as VINrises above the trip point. For
this example, choose 3V.
