LMC7215 LMC7225 LMC7215IM5 LMC7225IM5 MA05A LMC7215IM5X LMC7225IM5X LMC7215IM - Datasheet Archive

 

Micro-Power Rail-to-Rail CMOS Comparators with Open-Drain Push-Pull Outputs and TinyPak TM Package General Description Features

 

LMC7215 LMC7215 LMC7225 LMC7225 Micro-Power Rail-to-Rail CMOS Comparators with Open-Drain Push-Pull Outputs and TinyPak TM Package General Description Features (Typical unless otherwise noted) The LMC7215 LMC7215 LMC7225 LMC7225 are ultra low power comparators with a maximum of 1 mA power supply current They are designed to operate over a wide range of supply voltages from 2V to 8V The LMC7215 LMC7215 LMC7225 LMC7225 have a greater than rail-to-rail common mode voltage range This is a real advantage in single supply applications The LMC7215 LMC7215 features a push-pull output stage This feature allows operation with absolute minimum amount of power consumption when driving any load The LMC7225 LMC7225 features an open drain output By connecting an external resistor the output of the comparator can be used as a level shifter to any desired voltage to as high as 15V The LMC7215 LMC7215 LMC7225 LMC7225 are designed for systems where low power consumption is the critical parameter Guaranteed operation over the full supply voltage range of 2 7V to 5V and rail-to-rail performance makes this comparator ideal for battery-powered applications Y Y Y Y Y Y Y Y Ultra low power consumption 0 7 mA Wide range of supply voltages 2V to 8V Input common-mode range beyond V a and Vb Open collector and push-pull output High output current drive ( VS e 5V) 45 mA Propagation delay ( VS e 5V 10 mV overdrive) 25 ms Tiny SOT23-5 package Latch-up resistance l300 mA Applications Y Y Y Y Y Y Y Laptop computers Mobile phones Metering systems Hand-held electronics RC timers Alarm and monitoring circuits Window comparators multivibrators Connection Diagrams 5-Pin SOT23-5 8-Pin SO-8 TL H 12853 ­ 2 Top View TL H 12853 ­ 1 Top View Ordering Information Package Ordering Information NSC Drawing Number Package Marking Supplied As 5-Pin SOT 23-5 5-Pin SOT 23-5 LMC7215IM5 LMC7215IM5 LMC7225IM5 LMC7225IM5 MA05A MA05A MA05A MA05A C02B C03B 250 Tape and Reel 250 Tape and Reel 5-Pin SOT 23-5 5-Pin SOT 23-5 LMC7215IM5X LMC7215IM5X LMC7225IM5X LMC7225IM5X MA05A MA05A MA05A MA05A C02B C03B 3k Tape and Reel 3k Tape and Reel 8-Pin SO-8 8-Pin SO-8 LMC7215IM LMC7215IM LMC7225IM LMC7225IM M08A M08A LMC7215IM LMC7215IM LMC7225IM LMC7225IM Rails Rails 8-Pin SO-8 8-Pin SO-8 LMC7215IMX LMC7215IMX LMC7225IMX LMC7225IMX M08A M08A LMC7215IM LMC7215IM LMC7225IM LMC7225IM 2 5k Tape and Reel 2 5k Tape and Reel TinyPKTM is a trademark of National Semiconductor Corporation C1996 C1996 National Semiconductor Corporation TL H 12853 RRD-B30M86 RRD-B30M86 Printed in U S A http www national com LMC7215 LMC7215 LMC7225 LMC7225 Micro-Power Rail-to-Rail CMOS Comparators with Open-Drain Push-Pull Outputs and TinyPak Package August 1996 Absolute Maximum Ratings (Note 1) Operating Ratings (Note 1) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Junction Temperature Range ESD Tolerance (Note 2) Differential Input Voltage LMC7215IM LMC7215IM LMC7225IM LMC7225IM 2 kV 2V s VCC s 8V b 40 C s TJ s a 85 C Thermal Resistance (iJA) M Package 8-Pin Surface Mount SOT23-5 Package (VCC) a 0 3V to (bVCC)b0 3V Voltage at Input Output Pin (VCC) a 0 3V to (bVCC)b0 3V Supply Voltage (V a ­ Vb) 10V g 5 mA Current at Input Pin g 30 mA Current at Output Pin (Note 3) Current at Power Supply Pin 40 mA Lead Temperature (soldering 10 sec) 260 C b 65 C to a 150 C Storage Temperature Range Junction Temperature (Note 4) 150 C 165 C W 325 C W 2 7V to 5V Electrical Characteristics Unless otherwise specified all limits guaranteed for TJ e 25 C V a e 2 7V to 5V Vb e 0V VCM e VO e V a 2 Boldface limits apply at the temperature extremes Symbol Parameter Typ (Note 5) LMC7215 LMC7215 Limit (Note 6) LMC7225 LMC7225 Limit (Note 6) Units 1 Conditions 6 8 6 8 mV max VOS Input Offset Voltage TCVOS Input Offset Voltage Average Drift 2 mV C IB Input Current 5 fA IOS Input Offset Current 1 fA CMRR Common Mode Rejection Ratio (Note 7) PSRR Power Supply Rejection Ratio V a e 2 2V to 8V AV Voltage Gain CMVR Input Common-Mode Voltage Range 80 60 60 dB min 90 60 60 dB min 29 27 V min 140 dB 00 02 V max 53 52 50 52 50 V min b0 3 b0 2 b0 2 00 00 V max V a e 2 2V IOH e 1 5 mA 2 05 18 17 NA V min V a e 2 7V IOH e 2 0 mA 2 05 23 22 NA V min V a e 5 0V IOH e 4 0 mA www national com 00 02 V a e 5 0V CMRR l 50 dB http b0 2 V a e 5 0V CMRR l 50 dB Output Voltage High 30 29 27 V a e 2 7V CMRR l 50 dB VOH V a e 2 7V CMRR l 50 dB 48 46 45 NA V min 2 2 7V to 5V Electrical Characteristics (Continued) Unless otherwise specified all limits guaranteed for TJ e 25 C V a e 2 7V to 5V Vb e 0V VCM e VO e V a 2 Boldface limits apply at the temperature extremes (Continued) ISC a LMC7225 LMC7225 Limit (Note 6) Units V a e 2 2V IOH e 1 5 mA 0 17 04 05 04 05 V max 0 17 04 05 04 05 V max 02 04 05 04 05 V max V a e 2 7V Sourcing 15 NA mA V a e 5 0V Sourcing 50 NA V a e 2 7V Sinking 12 mA V a e 5 0V Sinking 30 mA Parameter Output Voltage Low Output Short Circuit Current (Note 10) ISCb Output Short Circuit Current (Note 10) ILeakage Output Leakage Current IS LMC7215 LMC7215 Limit (Note 6) V a e 5 0V IOH e 4 0 mA VOL Typ (Note 5) V a e 2 7V IOH e 2 0 mA Symbol Supply Current Conditions mA V a e 2 2V VIN a e 0 1V VINb e 0V VOUT e 15V 0 01 NA 500 nA max V a e 5 0V VIN a e 5V VINb e 0V 07 1 12 1 12 mA max AC Electrical Characteristics Unless otherwise specified TJ e 25 C V a e 5V Vb e 0V VCM e V a 2 Symbol Parameter Conditions LMC7215 LMC7215 Typ (Note 5) LMC7225 LMC7225 Typ (Notes 5 and 8) Units trise Rise Time Overdrive e 10 mV (Note 8) 1 12 2 ms tfall Fall Time Overdrive e 10 mV (Note 8) 04 0 35 ms tPHL Propagation Delay (High to Low) (Note 9) V a e 2 7V (Note 9) tPLH Propagation Delay (Low to High) (Note 9) 10 mV 24 24 100 mV 12 12 10 mV 17 17 100 mV 11 11 V a e 2 7V (Note 9) 10 mV 24 12 17 10 mV 17 22 100 mV 11 ms 29 100 mV ms 16 ms ms Note 1 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur Operating Ratings indicate conditions for which the device is intended to be functional but specific performance is not guaranteed For guaranteed specifications and the test conditions see the Electrical Characteristics Note 2 Human body model 1 5 kX in series with 100 pF Note 3 Applies to both single-supply and split-supply operation Continuous short circuit operation at elevated ambient temperature can result in exceeding the maximum allowed junction temperature of 150 C Note 4 The maximum power dissipation is a function of TJ(max) iJA and TA The maximum allowable power dissipation at any ambient temperature is PD e (TJ(max) b TA) iJA All numbers apply for packages soldered directly into a PC board Note 5 Typical values represent the most likely parametric norm Note 6 All limits are guaranteed by testing or statistical analysis Note 7 CMRR measured at VCM e 2 5V and 2 5V to 5V when VS e 5V VCM e 0 2V to 1 35V and 1 35V to 2 7V when VS e 2 7V This eliminates units that have large VOS at the VCM extremes and low or opposite VOS at VCM e VS 2 Note 8 All measurements made at 10 kHz A 100 kX pull-up resistor was used when measuring the LMC7225 LMC7225 CLOAD e 50 pF including the test jig and scope probe The rise times of the LMC7225 LMC7225 are a function of the R-C time constant Note 9 Input step voltage for the propagation measurements is 100 mV Note 10 Do not short the output of the LMC7225 LMC7225 to voltages greater than 10V or damage may occur 3 http www national com Typical Performance Characteristics TA e 25 C unless otherwise specified Supply Current vs Supply Voltage Prop Delay vs VSupply TL H 12853­3 Short Circuit Current vs VSupply TL H 12853 ­ 12 Output Voltage vs Output Current LMC7215 LMC7215 TL H 12853­14 Output Voltage vs Output Current LMC7215 LMC7215 TL H 12853 ­ 15 Output Voltage vs Output Current TL H 12853­17 TL H 12853 ­ 18 Output Leakage Current vs Output Voltage LMC7225 LMC7225 TL H 12853 ­ 20 http www national com 4 Prop Delay vs Overdrive TL H 12853 ­ 13 Output Voltage vs Output Current TL H 12853 ­ 16 Output Leakage Current vs Output Voltage LMC7225 LMC7225 TL H 12853 ­ 19 Application Information RESPONSE TIME INPUT VOLTAGE RANGE Depending upon the amount of overdrive the delay will typically be between 10 ms to 200 ms The curve showing delay vs overdrive in the ``Typical Characteristics'' section shows the delay time when the input is preset with 100 mV across the inputs and then is driven the other way by 1 mV to 500 mV The transition from high to low or low to high is fast Typically 1 ms rise and 400 ns fall With a small signal input the comparators will provide a square wave output from sine wave inputs at frequencies as high as 25 kHz Figure 1 shows a worst case example where a g 5 mV sine wave is applied to the input Note that the output is delayed by almost 180 The LMC7215 LMC7215 25 have input voltage ranges that are larger than the supply voltage guarantees that signals from other parts of the system cannot overdrive the inputs This allows sensing supply current by connecting one input directly to the V a line and the other to the other side of a current sense resistor The same is true if the sense resistor is in the ground return line Sensing supply voltage is also easy by connecting one input directly to the supply The inputs of these comparators are protected by diodes to both supplies This protects the inputs from both ESD as well as signals that greatly exceed the supply voltages As a result current will flow through these forward biased diodes whenever the input voltage is more than a few hundred millivolts larger than the supplies Until this occurs there is essentially no input current As a result placing a large resistor in series with any input that may be exposed to large voltages will limit the input current but have no other noticeable effect If the input current is limited to less than 5 mA by a series resistor (see Figure 2 ) a threshold or zero crossing detector that works with inputs from as low as a few millivolts to as high as 5 000V is made with only one resistor and the comparator INPUTS As mentioned above these comparators have near zero input current This allows very high resistance circuits to be used without any concern for matching input resistances This also allows the use of very small capacitors in R-C type timing circuits This reduces the cost of the capacitors and amount of board space used TL H 12853 ­ 4 CAPACITIVE LOADS The high output current drive allows large capacitive loads with little effect Capacitive loads as large as 10 000 pF have no effect upon delay and only slow the transition by about 3 ms FIGURE 1 NOISE Most comparators have rather low gain This allows the output to spend time between high and low when the input signal changes slowly The result is the output may oscillate between high and low when the differential input is near zero The exceptionally high gain of these comparators 10 000V mV eliminates this problem Less then 1 mV of change on the input will drive the output from one rail to the other rail If the input signal is noisy the output cannot ignore the noise unless some hysteresis is provided by positive feedback OUTPUT CURRENT Even though these comparators use less than 1 mA supply current the outputs are able to drive very large currents The LMC7215 LMC7215 can source up to 50 mA when operated on a 5V supply Both the LMC7215 LMC7215 and LMC7225 LMC7225 can sink over 20 mA (See the graph of Max IO vs VSupply in the ``Typical Characteristics'' section ) This large current handling ability allows driving heavy loads directly LEDs beepers and other loads can be driven easily The push-pull output stage of the LMC7215 LMC7215 is a very important feature This keeps the total system power consumption to the absolute minimum The only current consumed is the less than 1 mA supply current and the current going directly into the load No power is wasted in a pull-up resistor when the output is low The LMC7225 LMC7225 is only recommended where a level shifting function from one logic level to another is desired where the LMC7225 LMC7225 is being used as a drop-in lower power replacement for an older comparator or in circuits where more than one output will be paralleled TL H 12853 ­ 5 FIGURE 2 5 http www national com Application Information (Continued) The LMC7215 LMC7215 produces a small current spike of 300 mA peak for about 400 ns with 2 7V supply and 1 8 mA peak for 400 ns with a 5V supply This spike only occurs when the output is going from high to low It does not occur when going from low to high Figures 4 and 5 show what this current pulse looks like on 2 7V and 5V supplies The upper trace is the output voltage and the lower trace is the supply current as measured with the circuit in Figure 6 If the power supply has a very high impedance a bypass capacitor of 0 01 mF should be more than enough to minimize the effects of this small current pulse POWER DISSIPATION The large output current ability makes it possible to exceed the maximum operating junction temperature of 85 C and possibly even the absolute maximum junction temperature of 150 C The thermal resistance of the 8-pin surface mount package is 165 C W Shorting the output to ground with a 2 7V supply will only result in about 5 C rise above ambient The thermal resistance of the much smaller SOT23-5 package is 325 C W With a 2 7V supply the raise is only 10 5 C but if the supply is 5V and the short circuit current is 50 mA this will cause a raise of 41 C in the SO-8 and 81 C in the SOT23-5 This should be kept in mind if driving very low resistance loads SHOOT-THROUGH Shoot-through is a common occurrence on digital circuits and comparators where there is a push-pull output stage This occurs when a signal is applied at the same time to both the N-channel and P-channel output transistors to turn one off and turn the other on (See Figure 3 ) If one of the output devices responds slightly faster than the other the fast one can be turned on before the other has turned off For a very short time this allows supply current to flow directly through both output transistors The result is a short spike of current drawn from the supply TL H 12853 ­ 8 FIGURE 5 RS e 10X TL H 12853­6 TL H 12853 ­ 9 FIGURE 3 FIGURE 6 LATCH-UP In the past most CMOS IC's were susceptible to a damaging phenomena known as latch-up This occurred when an ESD current spike or other large signal was applied to any of the pins of an IC The LMC7215 LMC7215 and LMC7225 LMC7225 both are designed to make them highly resistant to this type of damage They have passed qualification tests with input currents on any lead up to 300 mA at temperatures up to 125 C SPICE MODELS For a SPICE model of the LMC7215 LMC7215 LMC7225 LMC7225 and many other op-amps and comparators contact the NSC Customer Response Center at 800-272-9959 or on the World Wide Web at http www national com models index html TL H 12853­7 FIGURE 4 RS e 100X http www national com 6 SOT-23-5 Tape and Reel Specification REEL DIMENSIONS TL H 12853 ­ 10 8 mm Tape Size 7 00 0 059 0 512 0 795 2 165 0 331 a 0 059 b0 000 0 567 W1 a 0 078 b0 039 330 00 1 50 13 00 20 20 55 00 8 40 a 1 50 b0 00 14 40 W1 a 2 00 b1 00 A B C D N W1 7 W2 W3 http www national com SOT-23-5 Tape and Reel Specification (Continued) TAPE FORMAT Tape Section Cavities Cavity Status Cover Tape Status Leader (Start End) 0 (min) Empty Sealed 75 (min) Empty Sealed Carrier 3000 Filled Sealed 250 Filled Sealed Trailer (Hub End) 125 (min) Empty Sealed 0 (min) Empty Sealed TAPE DIMENSIONS TL H 12853 ­ 11 8 mm 0 130 (3 3) 0 124 (3 15) 0 130 (3 3) 0 126 (3 2) Tape Size DIM A DIM Ao DIM B DIM Bo http www national com 0 138 g 0 002 0 055 g 0 004 (3 5 g 0 05) (1 4 g 0 11) DIM F 8 DIM Ko 0 157 (4) 0 315 g 0 012 (8 g 0 3) DIM P1 DIM W Physical Dimensions inches (millimeters) unless otherwise noted Suffix indicates number of units See Ordering Information on first page 5-Pin SOT Package Order Number LMC7215IM5X LMC7215IM5X LMC7225IM5X LMC7225IM5X LMC7215IM5 LMC7215IM5 or LMC7225IM5 LMC7225IM5 NS Package Number MA05A MA05A 9 http www national com LMC7215 LMC7215 LMC7225 LMC7225 Micro-Power Rail-to-Rail CMOS Comparators with Open-Drain Push-Pull Outputs and TinyPak Package Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Lit 108496-001 8-Pin Small Outline Package Order Number LMC7215IM LMC7215IM LMC7225IM LMC7225IM LMC7215IMX LMC7215IMX or LMC7225IMX LMC7225IMX NS Package Number M08A LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or systems which (a) are intended for surgical implant into the body or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user National Semiconductor Corporation 1111 West Bardin Road Arlington TX 76017 Tel 1(800) 272-9959 Fax 1(800) 737-7018 http www national com 2 A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness National Semiconductor Europe Fax a49 (0) 180-530 85 86 Email europe support nsc com Deutsch Tel a49 (0) 180-530 85 85 English Tel a49 (0) 180-532 78 32 Fran ais Tel a49 (0) 180-532 93 58 Italiano Tel a49 (0) 180-534 16 80 National Semiconductor Hong Kong Ltd 13th Floor Straight Block Ocean Centre 5 Canton Rd Tsimshatsui Kowloon Hong Kong Tel (852) 2737-1600 Fax (852) 2736-9960 National Semiconductor Japan Ltd Tel 81-043-299-2308 Fax 81-043-299-2408 National does not assume any responsibility for use of any 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