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19-1808; Rev 0; 10/00
+1.0V Micropower SOT23 Comparators
General Description
The MAX9100/MAX9101 micropower comparators are optimized for single-cell systems, and are fully specified for operation from a single supply of +1.0V to +5.5V. This ultra-low voltage operation, 5A 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(R) output swing allows almost all of the power supply to be used for signal voltage. In addition, propagation delay is less than 4s, 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.
____________________________Features
* Ultra-Low Voltage: Guaranteed Down to +1.0V * Low Quiescent Current: 5A * Optimized for Single-Cell Battery-Powered Systems * Wide Input Common-Mode Range * CMOS Rail-to-Rail Output Swing (MAX9100) * Open-Drain Output (MAX9101) * 4s 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
________________________Applications
Single-Cell Systems Pagers Closed Sensor Applications Battery-Powered Instrumentation Portable Electronic Equipment Portable Communication Devices
PART MAX9100EUK-T MAX9100ESA MAX9101EUK-T MAX9101ESA
Ordering Information
TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 5 SOT23-5 8 SO 5 SOT23-5 8 SO TOP MARK ADOR -- ADOS --
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Typical Operating Characteristic
SUPPLY CURRENT vs. TEMPERATURE
MAX9100 toc01
Pin Configurations
TOP VIEW
OUT 1 5 VCC
8 7 6 ICC (A) 5 VCC = +1V 4 3 2 -40 -15 10 35 60 VCC = +5V
VCC = +2V
GND 2
MAX9100 MAX9101
4 IN-
IN+ 3
SOT23
85
TEMPERATURE (C)
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
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.
+1.0V Micropower SOT23 Comparators MAX9100/MAX9101
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to GND) ................................. -0.3V to +6V IN+ or IN- to GND...................................... -0.3V to (VCC + 0.3V) 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 = +70C) 5-Pin Plastic SOT23 (derate 7.3mW/C above +70C) ............................... 571mW 8-Pin Plastic SO (derate 5.88mW/C above +70C) ............................. 471mW Operating Temperature Range .......................... -40C to +85C Junction Temperature ..................................................... +150C Storage Temperature Range ............................ -65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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
(VCC = +1.2V to +5.5V, VCM = 0, and TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Supply Voltage Range Supply Current Input Offset Voltage Input Hysteresis Input Offset Current Input Bias Current Input Resistance Input Common-Mode Voltage Range (Note 2) Common-Mode Rejection Ratio (Note 3) Power-Supply Rejection Ratio Output Voltage High (MAX9100) SYMBOL VCC ICC VOS VHYST IOS IB RIN VCM CMRR PSRR VCC = +5.5V, TA = +25C VCC = +5.5V, TA = TMIN to TMAX VCC = +5.5V, TA = +25C VCC = +5.5V, TA = TMIN to TMAX Differential mode Common mode Inferred from CMRR test TA = +25C TA = TMIN to TMAX 1.0V VCC 1.5V, TA = +25C 1.5V VCC 5.5V, TA = -40C to +85C VCC = +5.0V, ISOURCE = 5mA VCC - VOH VCC = +1.2V, ISOURCE = 0.5mA VCC = +1.0V, ISOURCE = 0.1mA, TA = VCC = +5.0V, ISINK = 5mA Output Voltage Low VOL VCC = +1.2V, ISINK = 0.5mA VCC = +1.0V, ISINK = 0.5mA, TA = +25C 0 54 46 54 56 66 68 90 60 25 100 45 15 180 120 75 180 120 75 mV mV 68 200 65 VCC -0.2 5 CONDITIONS Inferred from the PSRR tests VCC = +1V, TA = +25C VCC = +5V, TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 2 0.1 5 10 15 30 MIN 1.0 TYP 5.0 6.0 3 MAX 5.5 8.0 13.0 10 20 UNITS V A mV mV nA nA M V dB dB
2
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+1.0V Micropower SOT23 Comparators
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +1.2V to +5.5V, VCM = 0, and TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER SYMBOL Sourcing (MAX9100) Output Short-Circuit Current ISC Sinking Output Open-Drain Leakage Current (MAX9101) Power-Up Time Input Capacitance Output Rise Time (MAX9100) Output Fall Time (Note 4) ILKG tPU CIN trise tfall tpd+ Propagation Delay (Note 5) tpdtpd+ tpdCL = 15pF CL = 15pF VOVERDRIVE = 50mV, VCC = +5.0V VOVERDRIVE = 50mV, VCC = +5.0V VOVERDRIVE = 50mV, VCC = +1.0V VOVERDRIVE = 50mV, VCC = +1.0V VCC = +5.5V CONDITIONS VCC = +5.0V VCC = +1.2V VCC = +5.0V VCC = +1.2V MIN TYP 25 3 28 3 0.02 250 3 100 100 3.4 4.5 3.3 3.7 s 0.2 A ns pF ns ns MAX UNITS
MAX9100/MAX9101
mA
Note 1: All specifications are 100% production tested at TA = +25C. All temperature limits are guaranteed by design. Note 2: Operation with VCM up to VCC is possible with reduced accuracy. See Input Stage Circuitry and Rail-to-Rail Operation in the Applications section for more information. 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 = 5k for MAX9101. Note 5: Input overdrive is defined above and beyond the offset voltage and hysteresis of the comparator input.
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3
+1.0V Micropower SOT23 Comparators MAX9100/MAX9101
Typical Operating Characteristics
(VCC = +5V, VCM = 0, TA = +25C, unless otherwise noted.)
OUTPUT VOLTAGE LOW vs. SINK CURRENT
MAX9100 toc01 MAX1900 toc02
SUPPLY CURRENT vs. TEMPERATURE
8 7 6 ICC (A) 5 VCC = +1V 4 3 2 -40 -15 10 35 60 85 TEMPERATURE (C) VCC = +5V 600 500 400 VOL (mV) 300 200 100 0 0
OUTPUT VOLTAGE HIGH vs. SOURCE CURRENT
MAX1900 toc03
600 500 VCC = +1V VCC - VOH (mV) 400 VCC = +2V 300 200 100 0 VCC = +1.2V VCC = +5V
VCC = +2V
VCC = +1V VCC = +1.2V VCC = +2V VCC = +5V
5
10 ILOAD (mA)
15
20
0
5
10 ILOAD (mA)
15
20
INPUT BIAS CURRENT vs. VCM
800 700 600 IBIAS (nA) ICC (A) 500 400 300 200 100 0 -100 0 1 2 VCM(V) 3 4 5 4.5 IBIAS(-) = IBIAS(+) 5.0
MAX9100 toc04
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9100 toc05
SUPPLY CURRENT vs. OUTPUT TRANSITION FREQUENCY
35 30 ICC (A) 25 20 15 VCC = +2V 10 5 VCC = +5V
MAX9100 toc06
900
7.5 7.0 6.5 6.0 5.5 VOUT = GND
40
VOUT = VCC
VCM = VCC 0 1 2 3 VCC (V) 4 5 0.01 0.1
VCC = +1V 1 fCLK (kHz) 10 100
PROPAGATION DELAY (tpd+) vs. INPUT OVERDRIVE
MAX9100 toc07
PROPAGATION DELAY (tpd+) vs. INPUT OVERDRIVE
MAX9100 toc08
PROPAGATION DELAY (tpd)+ vs. INPUT OVERDRIVE
MAX9100 toc09
5.0
5.0
5.0
PROPAGATION DELAY (s)
PROPAGATION DELAY (s)
4.0
4.0
+85C +25C
PROPAGATION DELAY (s)
4.5
4.5
4.5
4.0 -40C 3.5 +25C VCC = +1V 2.5 +85C
3.5
+85C
3.5 -40C VCC = +2V 2.5
3.0 VCC = +5V 0 50 +25C, -40C 100 150 200 250
3.0
3.0
2.5
0
20
40
60
80
100
0
20
40
60
80
100
VOD (mV)
VOD (mV)
VOD (mV)
4
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+1.0V Micropower SOT23 Comparators
Typical Operating Characteristics (continued)
(VCC = +5V, VCM = 0, TA = +25C, unless otherwise noted.)
MAX9100/MAX9101
PROPAGATION DELAY vs. VCM
MAX9100 toc10
PROPAGATION DELAY (tPD+)
MAX9100 toc11
4.5
PROPAGATION DELAY (s)
4.0
IN+
50mV/div
3.5 tpd3.0 OUT 2.5 2.0 0 1 2 3 4 5 VCM (mV) tpd+ VOD = 50mV 1s/div 500mV/div
PROPAGATION DELAY (tPD-)
MAX9100 toc12
PROPAGATION DELAY (tPD+)
MAX9100 toc13
IN+
50mV/div
IN+
50mV/div
OUT
500mV/div
OUT
2V/div
VOD = 50mV 1s/div
VOD = 50mV 1s/div
PROPAGATION DELAY (tpd-)
MAX9100 toc14
POWER-UP DELAY
MAX9100 toc15
IN+
50mV/div
VCC
2V/div
OUT
2V/div
OUT VIN- = 0 VIN+ = 100mV
2V/div
VOD = 50mV 1s/div 100ns/div
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5
+1.0V Micropower SOT23 Comparators MAX9100/MAX9101
Typical Operating Characteristics (continued)
(VCC = +5V, VCM = 0, TA = +25C, unless otherwise noted.)
SWITCHING CURRENT, OUTPUT RISING
MAX9100 toc16
SWITCHING CURRENT, OUTPUT FALLING
MAX9100 toc17
RESPONSE TO SLOW TRIANGLE WAVEFORM
MAX9100 toc18
100mV/div
IN+
100mV/div
IN+
50mV/div
5V/div
OUT
5V/div
OUT 1mA/div VOD = 50mV 2s/div ICC VOD = 50mV 2s/div 5.0ms/div 1mA/div
2V/div
Pin Description
PIN SOT23-5 1 2 3 4 -- 5 SO-8 6 4 3 2 1, 5, 8 7 NAME OUT GND IN+ INN.C. VCC FUNCTION Comparator Output Ground Noninverting Input Inverting Input No Connection Positive Supply Voltage
to conduct. Consequently, bias currents increase exponentially 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 7A. 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 minimal supply-current increase as the output switching frequency approaches 100kHz. This characteristic reduces the requirement for power-supply filter capacitors to reduce glitches created by comparator switching currents. This feature increases battery life in portable applications.
Detailed Description
The MAX9100/MAX9101 are low-power and ultra-low single-supply voltage comparators. They have an operating supply voltage range between +1.0V to +5.5V and consume only 5A of quiescent supply current, while achieving 4s propagation delay.
Input Stage Circuitry and Rail-to-Rail Operation
The devices' input common-mode range is fully specified 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 voltage within these limits. Input bias current is typically 5nA if the input voltage is within the specified common-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
6
Push-Pull Output (MAX9100)
The MAX9100 has a push-pull CMOS output. The output stage swings rail-to-rail under no-load conditions. External load drive capability varies with supply voltage.
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+1.0V Micropower SOT23 Comparators
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 wire-OR configuration. VTH is the threshold voltage at which the comparator switches its output from high to low as V IN 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
R1 + R2 R2
MAX9100/MAX9101
Applications Information
Low-Voltage Operation: VCC = 1V The minimum operating voltage is +1.0V. At lower supply voltages, the input common-mode range remains rail-to-rail, but the comparator's output drive capability is reduced and propagation delay increases (see 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 resistors using positive feedback (Figure 2). Use the following procedure to calculate resistor values: 1) Calculate the trip points of the comparator using these formulas:
V CC - VREF R2 VTH = VREF + R1 + R2
3) In this example, let VCC = +5V and VREF = +2.5V:
R2 VTH = 2.5 + 2.5 R1 + R2
and
R2 VTL = 2.5 1 - R1 + R2
4) Select R2. In this example, we will choose 1k. 5) Select VHYS. In this example, we will choose 50mV. 6) Solve for R1:
R2 VHYS = VCC R1 + R2 1000 0.050 = 5 R1 +1000
(
)
where R1 100k, 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
VCC R2
and
R2 VTL = VREF 1 - R1 + R2
THRESHOLDS
IN+
VIN - +VHYST/2 INVIN - VHYST
HYSTERESIS VHYST BAND VREF
R2 VCC GND
OUT
MAX9100
OUT VIN
Figure 1. Threshold Hysteresis Band
Figure 2. Additional Hysteresis (MAX9100) 7
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+1.0V Micropower SOT23 Comparators MAX9100/MAX9101
+5V +1.0V +3V 232k INOUT 100k IN+ 5V LOGIC OUT VCC 100k INOUT 100k IN+ 3V LOGIC OUT VCC
RPULLUP
MAX9100
GND 3V LOGIC IN 1V LOGIC IN
MAX9101
GND
Figure 3. MAX9100 Logic-Level Translator
Figure 4. MAX9101 Logic-Level Translator
leads are long. Minimize signal lead lengths to reduce stray capacitance between the input and output that might cause instability.
Pin Configurations (continued)
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 inverting input is biased to +1.5V with two resistors. This configuration 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.
N.C.
1
MAX9100 MAX9101
8
N.C.
IN1 IN+
2
7
VCC
3
6
OUT
GND
4
5
N.C.
SO-8
Chip Information
TRANSISTOR COUNT: 393 PROCESS: BiCMOS
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 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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