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19-1936; Rev 0; 1/01
Low-Cost, 7ns, Low-Power Voltage Comparators
General Description ____________________________Features
o Fast 7ns Propagation Delay o Low 9mW/Comparator Power Consumption o Separate Analog and Digital Supplies o Flexible Analog Supply: +5V to +10V or 5V o Input Voltage Range Includes Negative Supply Rail o TTL-Compatible Outputs o TTL-Compatible Latch Inputs (MAX9202/MAX9203) o Available in Space-Saving Packages 8-Pin SOT23 (MAX9203) 14-Pin TSSOP (MAX9202) 16-Pin TSSOP (MAX9201)
MAX9201/MAX9202/MAX9203
The MAX9201/MAX9202/MAX9203 high-speed, lowpower, quad/dual/single comparators feature TTL logic outputs with active internal pullups. Fast propagation delay (7ns typ at 5mV overdrive) makes these devices ideal for fast A/D converters and sampling circuits, line receivers, V/F converters, and many other data-discrimination, signal restoration applications. All comparators can be powered from separate analog and digital power supplies or from a single combined supply voltage. The analog input common-mode range includes the negative rail, allowing ground sensing when powered from a single supply. The MAX9201/ MAX9202/MAX9203 consume only 9mW per comparator when powered from a +5V supply. The MAX9202/MAX9203 feature output latches with TTL compatible inputs. The comparator output states are held when the latch inputs are driven low. The MAX9201 provides all the same features as the MAX9202/MAX9203 with the exception of the latches. The MAX9201/MAX9202/MAX9203 are lower power and lower cost upgrades to the MAX901/MAX902/MAX903 offering a 50% power savings and smaller packaging.
Ordering Information
PART TEMP RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 16 TSSOP 16 Narrow SO 14 TSSOP 14 Narrow SO 8 SOT23-8 8 Narrow SO MAX9201EUE MAX9201ESE MAX9202EUD MAX9202ESD MAX9203EKA-T MAX9203ESA
________________________Applications
High-Speed A/D Converters High-Speed V/F Converters Line Receivers High-Speed Signal Squaring/Restoration Threshold Detectors Input Trigger Circuitry High-Speed Data Sampling PWM Circuits
Pin Configurations
TOP VIEW
INA- 1 INA+ 2 GND 3 OUTA 4 OUTB 5 VEE 6 INB+ 7 INB- 8
16 IND15 IND+ 14 VCC
INA- 1 INA+ GND 2 3
14 VCC 13 N.C. 12 OUTB
VCC 1 IN+ 2
8 7
VDD OUT GND LATCH
VDD 1 OUT 2 GND 3
8
VCC IN+ INVEE
MAX9203
IN3 6 5 VEE 4 LATCH 4
MAX9203
7 6 5
MAX9201
13 OUTD 12 OUTC 11 VDD 10 INC+ 9 INC-
LATCHA 4 OUTA 5 N.C. 6 VEE 7
MAX9202
11 LATCHB 10 VDD 9 8 INB+ INB-
SO
SOT23
SO/TSSOP SO/TSSOP
________________________________________________________________ Maxim Integrated Products
1
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Low Cost, 7ns, Low-Power Voltage Comparators MAX9201/MAX9202/MAX9203
ABSOLUTE MAXIMUM RATINGS
Analog Supply Voltage (VCC - VEE) .....................................+12V Digital Supply Voltage (VDD) .................................................+7V Differential Input Voltage..................(VEE - 0.3V) to (VCC + 0.3V) Common Mode Input Voltage ..........(VEE - 0.3V) to (VCC + 0.3V) Latch Input Voltage (MAX9202/MAX9203 only) .....................-0.3V to (VDD + 0.3V) Output Short-Circuit Duration To GND ......................................................................Continuous To VDD ..................................................................................1min Continuous Power Dissipation (TA = +70C) 8-Pin SOT23-8 (derate 9.1mW/C above +70C) ...727mW/C 8-Pin SO (derate 5.9mW/C above +70C).............471mW/C 14-Pin TSSOP (derate 9.1mW/C above +70C) ....727mW/C 14-Pin SO (derate 8.3mW/C above +70C)...........667mW/C 16-Pin TSSOP (derate 9.4mW/C above +70C) ....755mW/C 16-Pin SO (derate 8.7mW/C above +70C)...........696mW/C Operating Temperature Range ...........................-45C 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 = +5V, VEE = -5V, VDD = +5V, GND = 0, VCM = 0, LATCH_ = logic high, TA = -40C to +85C. Typical values are at TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER Analog Supply Voltage Range Digital Supply Voltage Range Input Offset Voltage Input Bias Current Input Offset Current Common-Mode Input Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Output High Voltage Output Low Voltage Latch Input Threshold Voltage High Latch Input Threshold Voltage Low Latch Input Current High Latch Input Current Low Input Capacitance Differential Input Impedance Common-Mode Input Impedance Positive Analog Supply Current SYMBOL VDD VOS IB IOS VCM CMRR PSRR VOH VOL VLH VLL ILH ILL CIN RIND RINCM MAX9201 ICC Note 5 MAX9202 MAX9203 CONDITIONS Referenced to GND VCM = 0, VOUT= 1.4V IIN+ or IINVCM = 0, VOUT = 1.4V Note 2 -5.1V < VCM < +2.75V VOUT = 1.4V Note 3 TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C 3.0 3.5 0.25 1.4 0.8 1.4 0.5 0.5 4 5 5.5 4.7 2.5 1.3 7 4.0 2 mA 3 3 0.4 2 50 TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C VEE - 0.1 50 50 1.25 MIN 4.75 4.75 1 TYP MAX 10.5 5.25 4 7.5 5 7.0 250 450 VCC 2.25 150 250 150 250 UNITS V V mV A nA V V/V V/V V V V V A A pF M M
VCC - VEE Referenced to VEE
(VIN+ - VIN-) > 250mV, ISOURCE = 1mA (VIN+ - VIN-) < -250mV, ISINK = 8mA Note 4 Note 4 VLH = 3.0V, Note 4 VLL = 0.3V, Note 4
2
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Low Cost, 7ns, Low-Power Voltage Comparators MAX9201/MAX9202/MAX9203
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = -5V, VDD = +5V, GND = 0, VCM = 0, LATCH_ = logic high, TA = -40C to +85C. Typical values are at TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER Negative Analog Supply Current SYMBOL IEE Note 5 CONDITIONS MAX9201 MAX9202 MAX9203 MAX9201 Digital Supply Current IDD Note 5 MAX9202 MAX9203 MAX9201 Power Dissipation PD VCC = VDD = +5V, VEE = 0V MAX9202 MAX9203 MIN TYP 3.4 1.8 1.0 2 1 0.5 33 17 9 MAX 5.0 3.0 1.6 3.0 1.5 0.8 44 24 13 mW mA mA UNITS
TIMING CHARACTERISTICS
(VCC = +5V, VEE = -5V, VDD = +5V, GND = 0, VCM = 0, LATCH_ = logic high, TA = -40C to +85C. Typical values are at TA = +25C, unless otherwise noted.) (Notes 1, 6)
PARAMETER Input-to-Output High Response Time Input-to-Output Low Response Time Rise Time Fall Time Difference in Response Time Between Outputs Latch Disable to Output High Delay Latch Disable to Output Low Delay Minimum Setup Time Minimum Hold Time Minimum Latch Disable Pulse Width SYMBOL tPD+ VOD = 5mV, CL = 15pF, IOUT = 2mA VOD = 5mV, CL = 15pF, IOUT = 2mA CL = 15pF, IOUT = 2mA CL = 15pF, IOUT = 2mA Note 7 Note 4 Note 4 Note 4 Note 4 Note 4 CONDITIONS TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = +25C TA = +25C TA = -40C to +85C 10 10 2 1 8 2.0 1.0 0.5 1.5 2.5 7 MIN TYP 7 MAX 9 ns 12 9 ns 12 ns ns ns ns ns ns ns ns UNITS
tPD-
tR tF tPD tPD+(D) tPD-(D) tS tN tPW(D)
Note 1: All devices are 100% production tested at TA = +25C. All temperature limits are guaranteed by design. Note 2: Inferred by CMRR test. Note 3: Tested for +4.75V < VCC < +5.25V, and -5.25V < VEE < -4.75V with VDD = +5V, although permissible analog power-supply range is 4.75V < VCC < +10.5V for single supply operation with VEE grounded. Note 4: Specification does not apply to MAX9201. Note 5: ICC tested for 4.75V < VCC < +10.5V with VEE grounded. IEE tested for -5.25V < VEE < -4.75V with VCC = +5V. IDD tested for +4.75V < VDD < +5.25V with all comparator outputs low, worst-case condition. Note 6: Guaranteed by design. Times are for 100mV step inputs (see propagation delay characteristics in Figures 2 and 3) Note 7: Maximum difference in propagation delay between two comparators in the MAX9201/MAX9202. _______________________________________________________________________________________ 3
Low Cost, 7ns, Low-Power Voltage Comparators MAX9201/MAX9202/MAX9203
Typical Operating Characteristics
(VCC = +5V, VEE = -5V, VDD = +5V, GND = 0, VCM = 0, LATCH_ = logic high, VOUT = 1.4V, TA = +25C, unless otherwise noted.)
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX9201 toc01
INPUT BIAS CURRENT vs. TEMPERATURE
VCM = 0 1.6 INPUT BIAS CURRENT (A) 1.4 1.2 1.0 0.8 0.6 0.4
MAX9201 toc02
1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -40 -15 10 35 60
1.8
INPUT OFFSET VOLTAGE (mV)
85
-40
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
OUTPUT HIGH VOLTAGE (VOH) vs. LOAD CURRENT
MAX9201 toc03
OUTPUT LOW VOLTAGE (VOL) vs. LOAD CURRENT
350 OUTPUT LOW VOLTAGE (mV) 300 250 200 150 100 50 0 0 2 4 6 8 10 12 TA = +85C TA = +25C
MAX9201 toc04 MAX9201 toc06
4.0 3.8 OUTPUT HIGH VOLTAGE (V) 3.6 3.4 3.2 3.0 2.8 0 2 4 6 8 10
400 TA = -40C
TA = +85C
TA = +25C
TA = -40C
12
LOAD CURRENT (mA)
LOAD CURRENT (mA)
ICC SUPPLY CURRENT (PER COMPARATOR) vs. VCC SUPPLY VOLTAGE
MAX9201 toc05
RESPONSE TIME vs. INPUT OVERDRIVE
10.0 9.5 9.0 RESPONSE TIME (ns) 8.5 8.0 7.5 7.0 6.5 6.0 tPD+ tPD-
1.6 1.5 ICC SUPPLY CURRENT (mA) 1.4 1.3 1.2 1.1 1.0 0.9 0.8 5 6 7 8 9 TA = -40C VEE = GND TA = +25C TA = +85C
5.5 5.0 10 0 5 10 15 20 25 30 35 40 45 50 INPUT OVERDRIVE (mV)
VCC SUPPLY VOLTAGE (V)
4
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Low Cost, 7ns, Low-Power Voltage Comparators
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, VDD = +5V, GND = 0, VCM = 0, LATCH_ = logic high, VOUT = 1.4V, TA = +25C, unless otherwise noted.)
MAX9201/MAX9202/MAX9203
RESPONSE TIME vs. TEMPERATURE (5mV OVERDRIVE)
MAX9201 toc07
RESPONSE TIME vs. LOAD CAPACITANCE (5mV OVERDRIVE, RLOAD = 2.4k)
9.5 tPDRESPONSE TIME (ns) 9.0 8.5 8.0 7.5 7.0 tPD+
MAX9201 toc08
8.0 7.8 RESPONSE TIME (ns) 7.5 7.3 tPD+ 7.0 6.8 6.5 tPD-
10.0
6.5 6.0 0 10 20 30 40 50 60 70 80 90
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 TEMPERATURE (C)
LOAD CAPACITANCE (pF)
Pin Description
MAX9201
PIN 1, 8, 9, 16 2, 7, 10, 15 3 4, 5, 12, 13 6 11 14 NAME IN_IN_+ GND OUT_ VEE VDD VCC FUNCTION Negative Input (Channels A, B, C, D) Positive Input (Channels A, B, C, D) Ground Output (Channels A, B, C, D) Negative Analog Supply and Substrate Positive Digital Supply 10 Positive Analog Supply 14 VDD VCC
MAX9202
PIN 1, 8 2, 9 3 4, 11 5, 12 6, 13 7 NAME IN_IN_+ GND LATCH_ OUT_ N.C. VEE FUNCTION Negative Input (Channels A, B) Positive Input (Channels A, B) Ground Latch Input (Channels A, B) Output (Channels A, B) No Connection Negative Analog Supply and Substrate Positive Digital Supply Positive Analog Supply
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Low Cost, 7ns, Low-Power Voltage Comparators MAX9201/9202/9203
Pin Description (continued) MAX9203
PIN NAME SO 1 2 3 4 5 6 7 8 SOT 8 7 6 5 4 3 2 1 VCC IN+ INVEE LATCH GND OUT VDD Positive Analog Supply Positive Input Negative Input Negative Analog Supply and Substrate Latch Input Ground Output Positive Digital Supply FUNCTION
decoupling and terminating components. Short lead lengths on the inputs and outputs are essential to avoid unwanted parasitic feedback around the comparators. Solder the device directly to the printed circuit board instead of using a socket.
Input Slew-Rate Requirements
As with all high-speed comparators, the high gain-bandwidth product of the MAX9201/MAX9202/ MAX9203 can create oscillation problems when the input traverses the linear region. For clean output switching without oscillation or steps in the output waveform, the input must meet minimum slew-rate requirements (0.5V/s typ). Oscillation is largely a function of board layout and of coupled source impedance and stray input capacitance. Both poor layout and large source impedance will cause the part to oscillate and increase the minimum slew-rate requirement. In some applications, it may be helpful to apply some positive feedback between the output and positive input. This pushes the output through the transition region clearly, but applies a hysteresis in threshold seen at the input terminals.
Applications Information
Circuit Layout
Because of the large gain-bandwidth transfer function of the MAX9201/MAX9202/MAX9203 special precautions must be taken to realize their full high-speed capability. A printed circuit board with a good, lowinductance ground plane is mandatory. All decoupling capacitors (the small 100nF ceramic type is a good choice) should be mounted as close as possible to the power-supply pins. Separate decoupling capacitors for analog VCC and for digital VDD are also recommended. Close attention should be paid to the bandwidth of the
TTL Output and Latch Inputs
The comparator TTL output stages are optimized for driving low-power Schottky TTL with a fan-out of four. When the latch is connected to a logic high level or left floating, the comparator is transparent and immediately responds to changes at the input terminals. When the latch is connected to a TTL low level, the comparator output latches (in the same state) the instant that the latch command is applied, and will not respond to subsequent changes at the input. No latch is provided on the MAX9201.
Typical Power-Supply Alternatives
+10V +5V VCC VDD OUT GND VEE VEE GND VEE VCC VDD OUT GND VCC VDD OUT +5V +5V +5V
-5V
Figure 1a. Separate Analog Supply, Common Ground 6
Figure 1b. Single +5V Supply, Common Ground
Figure 1c. Split 5V Supply, Separate Ground
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Low Cost, 7ns, Low-Power Voltage Comparators MAX9201/9202/9203
Power Supplies
The MAX9201/MAX9202/MAX9203 can be powered from separate analog and digital supplies or from a single +5V supply. The analog supply can range from +5V to +10V with VEE grounded for single-supply operation (Figures 1a and 1b) or from a split 5V supply (Figure 1c). The VDD digital supply always requires +5V. In high-speed, mixed-signal applications where a common ground is shared, a noisy digital environment can adversely affect the analog input signal. When set up with separate supplies, the MAX9201/MAX9202/MAX9203 isolate analog and digital signals by providing a separate analog ground (VEE) and digital ground (GND). tpdInput to Output Low Delay: The propagation delay measured from the time the input signal crosses the input offset voltage to the TTL logic threshold (+1.4V) of an output high to low transition. tpd+ (D) Latch Disable to Output High Delay: The propagation delay measured from the latch signal crossing the TTL logic threshold (+1.4V) in a low to high transition to the point of the output crossing TTL threshold (+1.4V) in a low to high transition. tpd- (D) Latch Disable to Output Low Delay: The propagation delay measured from the latch signal crossing the TTL threshold (+1.4V) in a low to high transition to the point of the output crossing TTL threshold (+1.4V) in a high to low transition. Minimum Setup Time: The minimum time, ts before the negative transition of the latch signal, that an input signal change must be present in order to be acquired and held at the outputs. th Minimum Hold Time: The minimum time, after the negative transition of the latch signal, that an input signal must remain unchanged in order to be acquired and held at the output. Minimum Latch Disable Pulse Width: The minimum time that the latch signal must remain high in order to acquire and hold an input signal change.
Definition of Terms
VOS Input Offset Voltage: Voltage applied between the two input terminals to obtain TTL logic threshold (+1.4V) at the output. Input Voltage Pulse Amplitude: Usually set to 100mV for comparator specifications. Input Voltage Overdrive: Usually set to 5mV and in opposite polarity to VIN for comparator specifications. Input to Output High Delay: The propagation delay measured from the time the input signal crosses the input offset voltage to the TTL logic threshold (+1.4V) of an output low to high transition.
VIN VOD
tpd+
tpw (D)
LATCH ENABLE INPUT LATCH
COMPARE
COMPARE 1.4V LATCH LATCH INPUT 0V VOD + 5mV 50mV/div
ts VIN VOD
th
tpw (D) VOS OUTPUT 1V/div
tpd COMPARATOR OUTPUT
tpd+ (D) 1.4V
0V
5ns/div
Figure 2. MAX9201/MAX9202/MAX9203 Diagram
Figure 3. tPD+ Response Time to 5mV Overdrive 7
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Low Cost, 7ns, Low-Power Voltage Comparators MAX9201/9202/9203
INPUT 50mV/div 0V OUTPUT VOD + 5mV
PRECISION STEP GENERATOR 10k 1k INPUT TO 10X SCOPE PROBE (10M 14pF)
VCC = +5V
VDD = +5V
10k
100nF
RL 2.43k
D.U.T. OUTPUT TO 10X SCOPE PROBE (10M 14pF) 100nF 10k VEE = -5V 100nF
1V/div
VCC OFFSET ADJUST 100nF
0V 5ns/div
Figure 4. tPD- Response Time to 5mV Overdrive
Figure 5. Response-Time Setup
OUTPUT OUTPUT 0V 2V/div 10mV/div 0V INPUT 0V INPUT 2V/div 0V 10mV/div
5ns/div
5ns/div
Figure 6. Response to 50MHz Sine Wave
Figure 7. Response to 100MHz Sine Wave
Chip Information
MAX9201 TRANSISTOR COUNT: 348 MAX9202 TRANSISTOR COUNT: 176 MAX9203 TRANSISTOR COUNT: 116 PROCESS: Bipolar
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) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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