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General Description
The MAX9100/MAX9101 micropower comparators are
optimized for single-cell systems, and are fully speci-
fied for operation from a single supply of 1.0V to 5.5V.
This ultra-low voltage operation, 5µA quiescent current
consumption, and small footprint make the
MAX9100/MAX9101 ideal for use in battery-powered
systems. A wide-input common-mode range that
includes the negative rail and rail-to-rail output swing
allows almost all of the power supply to be used for sig-
nal voltage. In addition, propagation delay is less than
4µs, and rise and fall times are 100ns.
The MAX9100 features a push-pull CMOS output stage
that sinks and sources current with large internal output
drivers that allow rail-to-rail output swings with loads up
to 5mA.The MAX9101 has an open-drain output stage
that makes it suitable for mixed-voltage designs.
The MAX9100/MAX9101 are available in tiny SOT23-5
packages.
________________________Applications
Single-Cell Systems
Pagers
Closed Sensor Applications
Battery-Powered Instrumentation
Portable Electronic Equipment
Portable Communication Devices
____________________________Features
• Ultra-Low Voltage: Guaranteed Down to 1.0V
• Low Quiescent Current: 5µA
• Optimized for Single-Cell Battery-Powered
Systems
• Wide Input Common-Mode Range
• CMOS Rail-to-Rail Output Swing (MAX9100)
• Open-Drain Output (MAX9101)
• 4µs Propagation Delay
• High Output Drive Capability: 5mA Sink and
Source (MAX9100)
• No Output Phase Reversal for Overdriven Inputs
• Available in Tiny SOT23-5 Package
MAX9100/MAX9101
+1.0V Micropower SOT23 Comparators
GND
IN-
IN+
15VCC
OUT
MAX9100
MAX9101
SOT23
TOP VIEW
2
34
Typical Operating Characteristic
2
4
3
6
5
7
8
-40 10-15 35 60 85
SUPPLY CURRENT vs. TEMPERATURE
MAX9100 toc01
TEMPERATURE (°C)
ICC (µA)
VCC = +5V
VCC = +2V
VCC = +1V
19-1808; Rev 1; 1/07
Ordering Information
PART PIN-
PACKAGE
TOP
MARK
PKG
CODE
MAX9100EUK-T
5 SOT23-5 ADOR U5-1
MAX9100ESA 8 SO —S8-2
MAX9101EUK-T
5 SOT23-5 ADOS U5-1
MAX9101ESA 8 SO —S8-2
Pin Configurations
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
Note: All devices specified for over -40°C to +85°C operating
temperature range.
MAX9100/MAX9101
+1.0V Micropower SOT23 Comparators
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC = +1.2V to +5.5V, VCM = 0V, and TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (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 (VCC to GND) ................................. -0.3V to +6V
IN+ or IN- to GND...................................... -0.3V to (VCC + 0.3V)
Current Into Input Pins..................................................... ±20mA
Output Voltages to GND
MAX9100.............................................. -0.3V to (VCC + 0.3V)
MAX9101 ............................................................ -0.3V to +6V
Output Short-Circuit Duration (to VCC or GND)......... Continuous
Continuous Power Dissipation (TA= +70°C)
5-Pin Plastic SOT23
(derate 7.3mW/°C above +70°C)............................... 571mW
8-Pin Plastic SO
(derate 5.88mW/°C above +70°C)............................. 471mW
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
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Supply Voltage Range VCC Inferred from the PSRR tests 1.0 5.5 V
VCC = +1V, TA = +25°C 5.0 8.0
Supply Current ICC VCC = +5V, TA = TMIN to TMAX 6.0
13.0
µA
TA = +25°C±3±10
Input Offset Voltage VOS TA = TMIN to TMAX ±20 mV
Input Hysteresis
VHYST
±2mV
VCC = +5.5V, TA = +25°C
±0.1
±5
Input Offset Current IOS VCC = +5.5V, TA = TMIN to TMAX ±10 nA
VCC = +5.5V, TA = +25°C±5±15
Input Bias Current IBVCC = +5.5V, TA = TMIN to TMAX ±30 nA
Differential mode
200
Input Resistance RIN Common mode 65 MΩ
Input Common-Mode Voltage
Range (Note 2) VCM Inferred from CMRR test 0
V
C C
- 0.2
V
TA = +25°C5468
Common-Mode
Rejection Ratio (Note 3)
CMRR
TA = TMIN to TMAX 46 dB
1.0V ≤ VCC ≤ 1.5V, TA = +25°C5466
Power-Supply
Rejection Ratio PSRR 1.5V ≤ VCC ≤ 5.5V, TA = -40°C to +85°C 56 68 dB
VCC = +5.0V, ISOURCE = 5mA 90 180
VCC = +1.2V, ISOURCE = 0.5mA 60 120
Output-Voltage High (MAX9100)
V
C C
- V
OH
VCC = +1.0V, ISOURCE = 0.1mA,
TA = +25°C25 75
mV
VCC = +5.0V, ISINK = 5mA
100
180
VCC = +1.2V, ISINK = 0.5mA 45 120Output-Voltage Low VOL
VCC = +1.0V, ISINK = 0.5mA, TA = +25°C1575
mV
MAX9100/MAX9101
+1.0V Micropower SOT23 Comparators
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +1.2V to +5.5V, VCM = 0V, and TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
VCC = +5.0V 25
Sourcing
(MAX9100) VCC = +1.2V 3
VCC = +5.0V 28
Output Short-Circuit Current ISC
Sinking VCC = +1.2V 3
mA
Output Open-Drain Leakage
Current (MAX9101) ILKG VCC = +5.5V
0.02
0.2 µA
Power-Up Time tPU
250
ns
Input Capacitance CIN 3pF
Output Rise Time (MAX9100) trise CL = 15pF
100
ns
Output Fall Time (Note 4) tfall CL = 15pF
100
ns
tpd+ VOVERDRIVE = 50mV, VCC = +5.0V 3.4
tpd- VOVERDRIVE = 50mV, VCC = +5.0V 4.5
tpd+ VOVERDRIVE = 50mV, VCC = +1.0V 3.3
Propagation Delay (Note 5)
tpd- VOVERDRIVE = 50mV, VCC = +1.0V 3.7
µs
Note 1: All specifications are 100% production tested at TA= +25°C. All temperature limits are guaranteed by design.
Note 2: Operation with VCM up to VCC is possible with reduced accuracy. See the Input Stage Circuitry and Rail-to-Rail
Operation section.
Note 3: Tested over the specified Input Common-Mode Voltage Range and with VCC = +5.5V.
Note 4: Specified with CL= 15pF for MAX9100/MAX9101, and with RPULLUP = 5kΩfor MAX9101.
Note 5: Input overdrive is defined above and beyond the offset voltage and hysteresis of the comparator input.
Typical Operating Characteristics
(VCC = +5V, VCM = 0V, TA= +25°C, unless otherwise noted.)
MAX9100/MAX9101
+1.0V Micropower SOT23 Comparators
4 _______________________________________________________________________________________
40
35
30
25
20
15
10
5
0
0.01 1 100.1 100
SUPPLY CURRENT
vs. OUTPUT TRANSITION FREQUENCY
MAX9100 toc06
fCLK (kHz)
ICC (µA)
VCC = +5V
VCC = +2V
VCC = +1V
MAX9100/MAX9101
+1.0V Micropower SOT23 Comparators
_______________________________________________________________________________________ 5
2.5
2.0
3.5
3.0
4.0
4.5
021 345
PROPAGATION DELAY vs. VCM
MAX9100 toc10
VCM (mV)
PROPAGATION DELAY (µs)
tpd-
tpd+
PROPAGATION DELAY (tPD+)
OUT 500mV/div
MAX9100 toc11
1µs/div
IN+ 50mV/div
VOD = 50mV
PROPAGATION DELAY (tPD-)
MAX9100 toc12
1µs/div
IN+
OUT
50mV/div
500mV/div
VOD = 50mV
PROPAGATION DELAY (tPD+)
MAX9100 toc13
1µs/div
IN+
OUT
50mV/div
2V/div
VOD = 50mV
PROPAGATION DELAY (tpd-)
MAX9100 toc14
1µs/div
IN+
OUT
50mV/div
2V/div
VOD = 50mV
POWER-UP DELAY
MAX9100 toc15
100ns/div
VCC
OUT
2V/div
2V/div
VIN- = 0V
VIN+ = 100mV
Typical Operating Characteristics (continued)
(VCC = +5V, VCM = 0V, TA= +25°C, unless otherwise noted.)
MAX9100/MAX9101
+1.0V Micropower SOT23 Comparators
6 _______________________________________________________________________________________
Detailed Description
The MAX9100/MAX9101 are low-power and ultra-low
single-supply voltage comparators. They have an oper-
ating supply voltage range between +1.0V to +5.5V
and consume only 5µA of quiescent supply current,
while achieving 4µs propagation delay.
Input Stage Circuitry and
Rail-to-Rail Operation
The devices’ input common-mode range is fully speci-
fied from 0 to (VCC - 0.2V), although full rail-to-rail input
range is possible with degraded performance. These
comparators may operate at any differential input volt-
age within these limits. Input bias current is typically
±5nA if the input voltage is within the specified com-
mon-mode range. Comparator inputs are protected
from overvoltage by internal diodes connected to the
supply rails. As the input voltage exceeds the supply
rails, these diodes become forward biased and begin
to conduct. Consequently, bias currents increase expo-
nentially as the input voltage exceeds the supply rails.
True rail-to-rail input operation is also possible. For
input common-mode voltages from VCC - 0.2V to VCC,
the input bias current will typically increase to 800nA.
Additionally, the supply current will typically increase to
7µA. Otherwise, the device functions as within the
specified common-mode range. See graphs in the
Typical Operating Characteristics.
Output Stage Circuitry
The MAX9100/MAX9101 contain a unique output stage
capable of rail-to-rail operation. Many comparators
consume orders of magnitude more current during
switching than during steady-state operation. 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 min-
imal supply-current increase as the output switching
frequency approaches 100kHz. This characteristic
reduces the requirement for power-supply filter capaci-
tors to reduce glitches created by comparator switch-
ing currents. This feature increases battery life in
portable applications.
Push-Pull Output (MAX9100)
The MAX9100 has a push-pull CMOS output. The out-
put stage swings rail-to-rail under no-load conditions.
External load drive capability varies with supply voltage.
SWITCHING CURRENT
OUTPUT RISING
MAX9100 toc16
100mV/div
1mA/div
2µs/div
5V/div
VOD = 50mV
,
SWITCHING CURRENT,
OUTPUT FALLING
MAX9100 toc17
IN+
ICC
100mV/div
1mA/div
2µs/div
OUT 5V/div
VOD = 50mV
RESPONSE TO SLOW TRIANGLE WAVEFORM
MAX9100 toc18
5.0ms/div
IN+
OUT
50mV/div
2V/div
Typical Operating Characteristics (continued)
(VCC = +5V, VCM = 0V, TA= +25°C, unless otherwise noted.)
Pin Description
PIN
SOT23-5 SO-8
NAME
FUNCTION
1 6 OUT Comparator Output
24
GND
Ground
3 3 IN+ Noninverting Input
4 2 IN- Inverting Input
—
1, 5, 8
N.C. No Connection
57V
CC Positive Supply Voltage
MAX9100/MAX9101
+1.0V Micropower SOT23 Comparators
_______________________________________________________________________________________ 7
Open-Drain Output (MAX9101)
The MAX9101 has an open-drain output, which can be
pulled up to +6.0V above ground independent of the
supply voltage. This is typically used with an external
pullup resistor, facilitating interface between mixed logic
voltages. Alternatively, multiple open-drain comparator
outputs can be connected in a wired-OR configuration.
Applications Information
Low-Voltage Operation: VCC = 1V
The minimum operating voltage is +1.0V. At lower sup-
ply voltages, the input common-mode range remains
rail-to-rail, but the comparator’s output drive capability is
reduced and propagation delay increases (see the
Typical Operating Characteristics).
Internal Hysteresis
Hysteresis increases the comparators’ noise margin by
increasing the upper threshold and decreasing the
lower threshold (Figure 1). This hysteresis prevents the
comparator from providing multiple poles when driven
with a very-slow-changing signal.
Additional Hysteresis
These comparators have 1.0mV internal hysteresis.
Additional hysteresis can be generated with two resis-
tors using positive feedback (Figure 2). Use the follow-
ing procedure to calculate resistor values:
1) Calculate the trip points of the comparator using
these formulas:
and
VTH is the threshold voltage at which the comparator
switches its output from high to low as VIN rises
above the trip point. VTL is the threshold voltage at
which the comparator switches its output from low to
high as VIN drops below the trip point.
2) The hysteresis band will be:
VHYS = VTH - VTL = VCC
3) In this example, let VCC = +5V and VREF = +2.5V:
and
4) Select R2. In this example, we will choose 1kΩ.
5) Select VHYS. In this example, we will choose 50mV.
6) Solve for R1:
where R1 ≈ 100kΩ, VTH = 2.525V, and VTL = 2.475V.
Board Layout and Bypassing
A power-supply bypass capacitor is not normally
required, but 100nF bypass capacitors can be used
when the supply impedance is high or when the supply
0 050 5 1000
1 1000
.=+
⎛
⎝
⎜⎞
⎠
⎟
R
VVR
RR
HYS CC
=+
⎛
⎝
⎜⎞
⎠
⎟
2
12
VR
RR
TL =−
+
⎛
⎝
⎜⎞
⎠
⎟
25 1 2
12
.
VR
RR
TH =+ +
⎛
⎝
⎜⎞
⎠
⎟
25 25 2
12
..
R
RR
2
12+
⎛
⎝
⎜⎞
⎠
⎟
VV R
RR
TL REF
=−
+
⎛
⎝
⎜⎞
⎠
⎟
12
12
VV
VVR
RR
TH REF
CC REF
=+ −
()
+
⎛
⎝
⎜
⎜
⎜
⎞
⎠
⎟
⎟
⎟
2
12
THRESHOLDS
OUT
IN-
IN+
VHYST
HYSTERESIS
BAND
VIN - VHYST
VIN - +VHYST/2
GND
VCC OUT
R2
R2
VIN
VREF
VCC
MAX9100
Figure 1. Threshold Hysteresis Band Figure 2. Additional Hysteresis (MAX9100)
MAX9100/MAX9101
+1.0V Micropower SOT23 Comparators
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
leads are long. Minimize signal lead lengths to reduce
stray capacitance between the input and output that
might cause instability.
Typical Application
Logic-Level Translator
3V to 5V
Figure 3 shows an application that converts 3V logic
levels to 5V logic levels. The push-pull output MAX9100
is powered by the +5V supply voltage, and the invert-
ing input is biased to +1.5V with two resistors. This con-
figuration allows a full 5V swing at the output,
maximizing the noise margin of the receiving circuit.
1V to 3V
Figure 4 shows an application that converts 1V logic
levels to 3V logic levels. The MAX9101 is powered by
the +1V supply voltage, and the pullup resistor for the
output is connected to the +3V supply voltage. The
inverting input is biased to +0.5V with two resistors.
Chip Information
TRANSISTOR COUNT: 393
PROCESS: BiCMOS
MAX9100
IN-
232kΩ
100kΩ
5V
LOGIC OUT
OUT
VCC
+5V
GND
3V LOGIC IN
IN+
MAX9101
IN-
100kΩ
100kΩ
3V
LOGIC OUT
OUT
VCC
+1.0V
GND
1V LOGIC IN
IN+
RPULLUP
+3V
Figure 3. MAX9100 Logic-Level Translator Figure 4. MAX9101 Logic-Level Translator
N.C.
IN-
N.C.
VCC
N.C.
OUT
IN+
GND
SO-8
2
3
4
18
7
6
5
MAX9100
MAX9101
Pin Configurations (continued)
Revision History
Pages changed at Rev 1: 1–8