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19-2045; Rev. 0; 5/01
25ns, Dual/Quad/Single, Low-Power, TTL Comparators
General Description
The MAX9107/MAX9108/MAX9109 dual/quad/single, high-speed, low-power voltage comparators are designed for use in systems powered from a single +5V supply. Their 25ns propagation delay (with 10mV input overdrive) is achieved with a power consumption of only 1.75mW per comparator. The wide input common-mode range extends from 200mV below ground to within 1.5V of the positive supply rail. The MAX9107/MAX9108/MAX9109 outputs are TTLcompatible, requiring no external pullup circuitry. These easy-to-use comparators incorporate internal hysteresis to ensure clean output switching even when the devices are driven by a slow-moving input signal. The MAX9107/MAX9108/MAX9109 are higher-speed, lower-power, lower-cost upgrades to industry-standard comparators MAX907/MAX908/MAX909. The MAX9109 features an output latch but does not have complementary outputs. The dual MAX9107 is available in both 8-pin SO and SOT23 packages. The quad MAX9108 is available in 14-pin TSSOP and SO packages while the single MAX9109 is available in an ultra-small 6-pin SC70 package, a space-saving 6-pin SOT23 package and an 8-pin SO package.
Features
o 25ns Propagation Delay o 350A (1.75mW) Supply Current Per Comparator o Single 4.5V to 5.5V Supply Operation o Wide Input Range Includes Ground o Low 500V Offset Voltage o Internal Hysteresis Provides Clean Switching (2mV) o TTL-Compatible Outputs o Internal Latch (MAX9109 only) o No Phase Reversal for Overdriven Inputs o Space-Saving Packages: 6-Pin SC70 (MAX9109) 8-Pin SOT23 (MAX9107) 14-Pin TSSOP (MAX9108)
MAX9107/MAX9108/MAX9109
Ordering Information
PART MAX9107EKA-T MAX9107ESA MAX9108EUD MAX9108ESD MAX9109EXT-T MAX9109EUT-T MAX9109ESA TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 8 SOT23-8 8 SO 14 TSSOP 14 SO 6 SC70-6 6 SOT23-6 8 SO TOP MARK AAIB -- -- -- AAU AARU --
Applications
Battery-Powered Systems A/D Converters Line Receivers Threshold Detectors/ Discriminators Sampling Circuits Zero-Crossing Detectors
Pin Configurations
TOP VIEW
OUTA INAINA+ GND
1 2 3 4
MAX9107
8 VCC
OUTA 1 A D
14 OUTD 13 IND12 IND+ MAX9108 B C 9 INC8 OUTC 11 GND 10 INC+
OUT 1
MAX9109
6 VCC
VCC IN+
1 2 3 4
MAX9109
8 N.C. 7 OUT 6 GND 5 LE
7 OUTB INA- 2 6 INB5 INB+ INA+ 3 VCC 4 INB+ 5
GND 2
5 LE
INN.C.
IN+ 3
4 IN-
SOT23/SO
INB- 6 OUTB 7
SO SC70/SOT23
TSSOP/SO
________________________________________________________________ Maxim Integrated Products
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25ns, Dual/Quad/Single, Low-Power, TTL Comparators MAX9107/MAX9108/MAX9109
ABSOLUTE MAXIMUM RATINGS
Power-Supply Ranges Supply Voltage (VCC to GND) ..............................................6V Differential Input Voltage ........................-0.3V to (VCC + 0.3V) Common-Mode Input Voltage to GND ...-0.3V to (VCC + 0.3V) Latch-Enable Input Voltage (MAX9109 only) ...................................-0.3V to (VCC + 0.3V) Output Short-Circuit Duration to VCC or GND ........................10s Continuous Power Dissipation (TA = +70C) 6-Pin SC70 (derate 3.1mW/C above +70C) ..............245mW 6-Pin SOT23 (derate 8.7mW/C above +70C)............696mW 8-Pin SOT23 (derate 9.1mW/C above +70C)............727mW 8-Pin SO (derate 5.9mW/C above +70C)..................470mW 14-Pin TSSOP (derate 9.1mW/C above +70C) .........727mW 14-Pin SO (derate 8.33mW/C above +70C)..............666mW Operating Temperature Range ...........................-40C to +85C 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 = +5V, VCM = 0, VLE = 0 (MAX9109 only), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Operating Voltage Range Input Offset Voltage Input Hysteresis Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Output High Voltage Output Low Voltage Supply Current Per Comparator Output Rise Time Output Fall Time SYMBOL VCC VOS VHYST IB IOS VCMR CMRR PSRR VOH VOL ICC tr tf (Note 4) VCC = 5.5V (Note 5) 4.5V VCC 5.5V ISOURCE = 100A ISINK = 3.2mA ISINK = 8mA VCC = +5.5V, all outputs low VOUT = 0.4V to 2.4V, CL = 10pF VOUT = 2.4V to 0.4V, CL = 10pF 3.0 -0.2 50 50 3.5 0.35 0.4 0.35 12 6 0.7 0.6 CONDITIONS Guaranteed by PSRR (Note 2) (Note 3) TA = +25C TA = TMIN to TMAX 2 125 25 350 80 VCC - 1.5 1000 1000 MIN 4.5 0.5 TYP MAX 5.5 1.6 4.0 UNITS V mV mV nA nA V V/V V/V V V mA ns ns
2
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25ns, Dual/Quad/Single, Low-Power, TTL Comparators
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VCM = 0, VLE = 0 (MAX9109 only), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Propagation Delay Differential Propagation Delay Propagation Delay Skew Latch Input Voltage High Latch Input Voltage Low Latch Input Current Latch Setup Time Latch Hold Time Note 1: Note 2: Note 3: SYMBOL tPD+, tPDtPD tPDskew VIH VIL IIH, IIL ts th CONDITIONS VIN = 100mV, VOD = 10mV VIN = 100mV, VOD = 10mV (Note 6) VIN = 100mV, VOD = 10mV (Note 7) (Note 8) (Note 8) (Note 8) (Note 8) (Note 8) 0.4 2 2 2.0 0.8 1 MIN TYP 25 1 5 MAX UNITS ns ns ns V V A ns ns
MAX9107/MAX9108/MAX9109
Note 4:
Note 5: Note 6: Note 7: Note 8:
Devices are 100% production tested at TA = +25C. All temperature limits are guaranteed by design. Input Offset Voltage is defined as the center of the input-referred hysteresis zone. Specified for VCM = 0. See Figure 1. Trip Point is defined as the input voltage required to make the comparator output change state. The difference between upper (VTRIP+) and lower (VTRIP-) trip points is equal to the width of the input-referred hysteresis zone (VHYST). Specified for an input common-mode voltage (VCM) of 0. See Figure 1. Inferred from the CMRR test. Note that a correct logic result is obtained at the output, provided that at least one input is within the VCMR limits. Note also that either or both inputs can be driven to the upper or lower absolute maximum limit without damage to the part. Tested over the full-input voltage range (VCMR). Differential Propagation Delay is specified as the difference between any two channels in the MAX9107/MAX9108 (both outputs making either a low-to-high or a high-to-low transition). Propagation Delay Skew is specified as the difference between any single channel's output low-to-high transition (tPD+) and high-to-low transition (tPD-). Latch specifications apply to MAX9109 only. See Figure 2.
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25ns, Dual/Quad/Single, Low-Power, TTL Comparators MAX9107/MAX9108/MAX9109
__________________________________________Typical Operating Characteristics
(VCC = 5V, VCM = 0, CL = 15pF, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE (OUTPUTS AT VOL)
MAX9107/08/09 toc01
SUPPLY CURRENT vs. SUPPLY VOLTAGE (OUTPUTS AT VOH)
MAX9107/08/09 toc02
INPUT VOLTAGE RANGE vs. TEMPERATURE
MAX9107/08/09 toc03
0.6 0.5 SUPPLY CURRENT (mA) 0.4 0.3 0.2 0.1 0 4.0 4.5 5.0 5.5 TA = -55C TA = +125C TA = +25C
0.5
5 4 3 2 1 0 -1
INPUT VOLTAGE RANGE (V)
0.4 SUPPLY CURRENT (mA) TA = +125C 0.3 TA = +25C 0.2 TA = -55C
VCMR+
0.1
VCMR-60 -40 -20 0 20 40 60 80 100 120 140
0 6.0 4.0 4.5 5.0 5.5 6.0 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V)
TEMPERATURE (C)
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX9107/08/09 toc04
INPUT BIAS CURRENT vs. TEMPERATURE
200 150 100 50 0 -50 -100 -150 -200 -250 -300 -350 -400 -50 -25 0 25 50 75 TEMPERATURE (C)
MAX9107/08/09 toc05
TRIP POINT vs. TEMPERATURE
VCM = 0 1 VOS (mV) VTRIP+
MAX9107/08/09 toc06
0.5 0.4 INPUT OFFSET VOLTAGE (mV) 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 -50 -25 0 25 50 75
2
INPUT CURRENT (nA)
0
-1
VTRIP-
-2 100 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (C)
100
TEMPERATURE (C)
OUTPUT LOW VOLTAGE vs. SINK CURRENT
MAX9107/08/09 toc07
OUTPUT HIGH VOLTAGE vs. SOURCE CURRENT
MAX9107/08/09 toc08
PROPAGATION DELAY vs. INPUT OVERDRIVE
RS = 10 CLOAD = 15pF PROPAGATION DELAY (ns) 30 tPD+ 25
MAX9107/08/09 toc09
0.5 TA = -55C 0.4 TA = +25C VOL (V) 0.3 TA = +125C
5.0 4.5 4.0 VOH (V) 3.5 3.0 TA = +125C
35
20 tPD-
0.2 2.5 0.1 0 2 4 6 ISINK (mA) 8 10 12 2.0 1
TA = +25C TA = -55C
15
10 10 100 ISOURCE (A) 1000 10 INPUT OVERDRIVE (mV) 100
4
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25ns, Dual/Quad/Single, Low-Power, TTL Comparators
____________________________Typical Operating Characteristics (continued)
(VCC = 5V, VCM = 0, CL = 15pF, TA = +25C, unless otherwise noted.)
PROPAGATION DELAY (tPD+)
INPUT 50mV/div OVERDRIVE 10mV
MAX9107/08/09 toc10
MAX9107/MAX9108/MAX9109
PROPAGATION DELAY (tPD-)
INPUT 50mV/div OVERDRIVE 10mV
MAX9107/08/09 toc11
OUTPUT 1V/div OUTPUT 1V/div 10ns/div 5ns/div
SINUSOID 2MHz RESPONSE
MAX9107/08/09 toc12
PROPAGATION DELAY vs. CAPACITIVE LOAD
VOD = 10mV RS = 10 PROPAGATION DELAY (ns) 35
MAX9107/08/09 toc13
40
INPUT 50mV/div
30
tPD+
25 tPD20
OUTPUT 1V/div
50ns/div
0
20
40
60
80
100
CAPACITIVE LOAD (pF)
PROPAGATION DELAY vs. TEMPERATURE
MAX9107/08/09 toc14
PROPAGATION DELAY vs. SOURCE IMPEDANCE
VOD = 5mV CLOAD = 15pF PROPAGATION DELAY (ns) 80
MAX9107/08/09 toc15
40 VOD = 10mV RS = 10 CLOAD = 15pF 30 tPD+
100
PROPAGATION DELAY (ns)
60
40 tPD+ 20
20
tPD-
10 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (C)
0 10 100 1k 10k SOURCE IMPEDANCE ()
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25ns, Dual/Quad/Single, Low-Power, TTL Comparators MAX9107/MAX9108/MAX9109
______________________________________________________________Pin Description
PIN MAX9109 MAX9107 1 2 3 7 6 5 -- -- -- -- -- -- -- -- -- 8 4 -- -- MAX9108 SC70/SOT23 1 2 3 7 6 5 8 9 10 14 13 12 -- -- -- 4 11 -- -- -- -- -- -- -- -- -- -- -- -- -- -- 1 3 4 6 2 5 -- SO -- -- -- -- -- -- -- -- -- -- -- -- 7 2 3 1 6 5 4, 8 OUTA INAINA+ OUTB INBINB+ OUTC INCINC+ OUTD INDIND+ OUT IN+ INVCC GND LE N.C. Channel A Output Channel A Inverting Input Channel A Noninverting Input Channel B Output Channel B Inverting Input Channel B Noninverting Input Channel C Output Channel C Inverting Input Channel C Noninverting Input Channel D Output Channel D Inverting Input Channel D Noninverting Input Output Noninverting Input Inverting Input Positive Supply Ground Latch Enable. The latch is transparent when LE is low. No Connection. Not internally connected. NAME FUNCTION
_______________Detailed Description
Timing
Noise or undesired parasitic AC feedback cause most high-speed comparators to oscillate in the linear region (i.e., when the voltage on one input is at or near the voltage on the other input). The MAX9107/MAX9108/ MAX9109 eliminate this problem by incorporating an internal hysteresis of 2mV. When the two comparator input voltages are equal, hysteresis effectively causes one comparator input voltage to move quickly past the other, thus taking the input out of the region where oscillation occurs. Standard comparators require that hysteresis be added through the use of external resistors. The MAX9107/MAX9108/MAX9109's fixed internal hysteresis eliminates these resistors. To increase hysteresis and noise margin even more, add positive feedback with two resistors as a voltage divider from the output to the noninverting input. Adding hysteresis to a comparator creates two trip points: one for the input voltage rising and one for the
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input voltage falling (Figure 1). The difference between these two input-referred trip points is the hysteresis. The average of the trip points is the offset voltage. Figure 1 illustrates the case where IN- is fixed and IN+ is varied. If the inputs were reversed, the figure would look the same, except the output would be inverted. The MAX9109 includes an internal latch, allowing the result of a comparison to be stored. If LE is low, the latch is transparent (i.e., the comparator operates as though the latch is not present). The state of the comparator output is latched when LE is high (Figure 2).
Applications Information
Circuit Layout
Because of the MAX9107/MAX9108/MAX9109's high gain bandwidth, special precautions must be taken to realize the full high-speed capability. A printed circuit board with a good, low-inductance ground plane is mandatory. Place the decoupling capacitor (a 0.1F ceramic capacitor is a good choice) as close to VCC as
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25ns, Dual/Quad/Single, Low-Power, TTL Comparators MAX9107/MAX9108/MAX9109
VTRIP+ VHYST VIN+ LE V + VTRIPVOS = TRIP+ 2 VIN- = 0 VOS DIFFERENTIAL INPUT VOLTAGE VOH OUTPUT 1.4V VOL VOL VOD VIN 3V 1.4V 0 COMPARE ts th LATCH
VTRIP-
VOH COMPARATOR OUTPUT
tPD+
Figure 1. Input and Output Waveforms, Noninverting Input Varied
Figure 2. MAX9109 Timing Diagram
possible. Pay close attention to the decoupling capacitor's bandwidth, keeping leads short. Short lead lengths on the inputs and outputs are also essential to avoid unwanted parasitic feedback around the comparators. Solder the device directly to the printed circuit board instead of using a socket.
10pF
1M +5V +5V
Overdriving the Inputs
The inputs to the MAX9107/MAX9108/MAX9109 may be driven to the voltage limits given in the Absolute Maximum Ratings. If the inputs are overdriven, there is no output phase reversal.
MAX4400
3 SIEMENS BP-104 PHOTODIODE 1
0.1F 5 4 2 3 6 1 4 2 5 DATA 0.1F
Battery-Operated Infrared Data Link
In Figure 3, the circuit allows reception of infrared data. The MAX4400 converts the photodiode current to a voltage, and the MAX9109 determines whether the amplifier output is high enough to be called a "1." The current consumption of this circuit is minimal: the MAX4400 and MAX9109 require typically 410A and 350A, respectively.
100k 1000pF 1000pF 47k
100k +5V
MAX9109
Figure 3. Battery-Operated Infrared Data Link Consumes Only 760A
Chip Information
MAX9107 TRANSISTOR COUNT: 262 MAX9108 TRANSISTOR COUNT: 536 MAX9109 TRANSISTOR COUNT: 140 PROCESS: Bipolar
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25ns, Dual/Quad/Single, Low-Power, TTL Comparators MAX9107/MAX9108/MAX9109
Package Information
SOT23, 8L.EPS
8
_______________________________________________________________________________________
TSSOP.EPS
25ns, Dual/Quad/Single, Low-Power, TTL Comparators
Package Information (continued)
SC70, 6L.EPS
MAX9107/MAX9108/MAX9109
_______________________________________________________________________________________
6LSOT.EPS
9
25ns, Dual/Quad/Single, Low-Power, TTL Comparators MAX9107/MAX9108/MAX9109
Package Information (continued)
SOICN.EPS
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.
10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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