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National LMV331 LMV393 LMV339 handbook

1. Input Bias Current nA 2 5 3 5 4 5 5 5 Supply Voltage V DS100080 36 Response Time vs Input Overdrives Negative Transition 3 8 20mv Yee 55 Ty 259C zo R 5 1k a gt 1 5 nput Overdrive 0 5mV 100 oS ot 25 0 0 5 1 5 2 Time ys DS100080 41 Output Voltage vs Output Current at 5V Supply 1000 900 800 700 600 500 49 C 85 C 259C Output Voltage mV 0 10 20 30 40 50 Output Current mA DS100080 37 Response Time vs Input Overdrives Negative Transition 2 5 8 4 100 mV Voc 5V E 3 T 25 C 20 mV R 5 1k a 2 5 o 1 0 Input Overdrive 5 100 5 o SS sz d a gt Overdrive 0 0 5 15 2 Time 05100080 42 Response Time for Input Overdrive Positive Transition 3 7 Voc 2 7V F T 25 C 55 R 5 1k G 3 7 1 Input 3 100 mV 20mV Overdrive 5 0 Overdrive 0 ZE 100 5 0 0 5 1 5 2 Time us DS100080 40 www national com Simplified Schematic DS100080 47 www national com 6 Application Circuits Basic Comparator A basic comparator circuit is used for converting analog sig nals to a digital output The LMV331 393 339 have an open collec
2. 0 102 0 254 Im 1 Fd A 0 102 0 014 0 008 0 010 ane 0 050 0 014 0 020 LT ALLLEAD TIPS 2 SML TYP 0 016 0 050 0 356 0 203 0 254 0 356 0 508 TYP ALL LEADS 0 406 1 270 0 008 ALL LEADS 0 203 REV 8 Pin Small Outline Order Number LMV393M and LMV393MX NS Package Number M08A www national com 18 Physical Dimensions inches millimeters unless otherwise noted Continued 0 118 0 004 3 0 1 Eta E cali E 0 193 0 004 0 1 1840 004 on 4 910 1 558 4 Fon TYP 1 1 1 1 PIN 1 y IDENT NOTE 2 0 016 TYP gt lt 0 0256 Y 0 41 peus 0 0256 TYP LAND PATTERN RECOMMENDATION 0 65 0 043 1 09 MAX 0 002 0 006 c 0 002 0 05 bi ore NUN Ky 0 021 0 005 d 5 010 0 53 0 12 09 69 _ 0 0375 SEATING PLANE 3 0 05 0 034 0 06 0 15 0 86 6 855 B 0 002 0 05 BO c 0 007 0 002 0 18 0 05 MUAOBA REV 8 Pin MSOP Order Number LMV393MM and LMV393MMX NS Package Number MUA08A 19 www national com Physical Dimensions inches millimeters unless otherwise noted Continued 0 335 0 344 8 509 8 738 0 228 0 244 5 791 6 198 L7 LEAD NO 1 x IDENT 0 010 MAX 0 254 0 150 0 157 3 810 3 988 lt 0 010 0 020 0 053
3. A logic output 4 at any of the inputs will produce a logic 71 at the V 25V 3k 0 025V f DS100080 10 FIGURE 13 OR Gate ORing the Output By the inherit nature of an open collector comparator the outputs of several comparators can be tied together with a pull up resistor to V If one or more of the comparators out puts goes low the output V will go low www national com Application Circuits continued DS100080 12 FIGURE 14 ORing the Outputs Vour A D 0 1 B C D I ALL DIODES 1N914 DS100080 13 FIGURE 15 Large Fan In AND Gate www national com 12 SC70 5 Tape and Reel Specification g1 5 0 1 2 lt 2 0 05 4 0 gt 0 3 0 05 1 SYMM 2 4 GAGE PLANE 1 0 MIN 0 5 A4 0 TYP B PLANE d SECTION B B CAVITY GAGE PLANE 5 R0 3 MAX TYP ff Yt Hc 2 25 0 10 TYP R30 MIN ALLOWED AT GAGE PLANE NI BEND RADIUS NOT TO SCALE DS100080 44 SOT 23 5 Tape and Reel Specification TAPE FORMAT Tape Section Cavities Cavity Status Cover Tape Status Leader Empty Start End Empy Carrier Filled Filed Trailer 125 min Hub End 0 min Empty Sealed 13 www national com SOT 23 5 Tape and Reel Specif
4. and PDA s Battery Powered Electronics General Purpose Portable Device General Purpose Low Voltage Applications Connection Diagrams 5 Pin SC70 5 SOT23 5 OUTPUT DS100080 1 Top View 8 Pin SO MSOP DS100080 2 Top View 14 Pin SO TSSOP DS100080 3 Top View 1999 National Semiconductor Corporation DS100080 www national com sioyesedwoy asoding je1euex GESANT IENA S6EAWT eiBurs LECAWT Ordering Information Temperature Range Packaging Transport NSC Package Industrial Marking Media Drawing 40 C to 85 C 5 pin SC70 5 LMV331M7 C13 1k Units Tape and Reel 05 LMV331M7X C13 3k Units Tape and Reel 5 pin SOT23 5 LMV331M5 C12 1k Units Tape and Reel 5 LMV331M5X C12 3k Units Tape and Reel 8 pin Small Outline LMV393M LMV393M Rails sia LMV393MX LMV393M 2 5k Units Tape and Reel 8 pin MSOP LMV393MM 1k UnitsTape and Reel ET LMV393MMX 3 5k Units Tape and Reel 14 pin Small Outline LMV339M Rails LMV339MX 2 5k Units Tape and Reel 14 pin TSSOP LMV339MT Rails reta LMV339MTX 2 5k Units Tape and Reel www national com Absolute Maximum Ratings Note 1 If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications ESD Tolerance Note 2 Human Body Model LMV331 393 339 800V Machine Model LMV
5. charge path will be the 1 MQ resistor and any load imped ance used Decay time is changed by varying the 1 MQ resistor DS100080 18 FIGURE 9 Negative Peak Detector www national com Application Circuits continued Driving CMOS and TTL The comparator s output is capable of driving CMOS and TTL Logic circuits DS100080 5 FIGURE 10 Driving CMOS 5 Voc 1 4 DM54XX 1 4 DM54XX DS100080 6 FIGURE 11 Driving TTL AND Gates The comparator can be used as three input AND gate The operation of the gate is as follow The resistor divider at the inverting input establishes a refer ence voltage at that node The non inverting input is the sum of the voltages at the inputs divided by the voltage dividers The output will go high only when all three inputs are high casing the voltage at the non inverting input to go above that at inverting input The circuit values shown work for a 0 equal to ground and a 1 equal to 5V The resistor values can be altered if different logic levels are desired If more inputs are required diodes are recom mended to improve the voltage margin when all but one of the inputs are high v 5V 3k 0 125V C f A B C DS100080 11 FIGURE 12 AND Gate OR Gates A three input OR gate is achieved from the basic AND gate simply by increasing the resistor value connected from the inverting input to Vec thereby reducing the reference volt age
6. dissipation is a function of and TA The maximum allowable power dissipation at any ambient temperature is Pp TA 0jA All numbers apply for packages soldered directly into a PC board Note 4 Typical Values represent the most likely parametric norm Note 5 All limits are guaranteed by testing or statistical analysis Tu max www national com Performance Characteristics unless otherwise specified Vs 45V single supply T4 25 C Supply Current vs Supply Voltage Output High LMV331 50 40 Lx 859 30 40 C 20 Supply Current 0 1 2 3 4 5 Supply Voltage V DS100080 34 Output Voltage vs Output Current at 2 7 Supply 600 500 400 300 200 Output Voltage mV 100 0 0 5 10 15 20 Output Current mA DS100080 38 Response Time for Input Overdrive Positive Transition 5 5 o Ty 25 55 5 5 1k VO A 20mV E 1 Input Overdrive 100 mV 5mV 0 Overdrive 0 ss 1 2 5 100 5 a 0 0 5 1 5 2 Time ys DS100080 43 Supply Current vs Supply Voltage Output Low LMV331 90 80 70 60 50 40 30 Supply Current uA 0 1 2 3 4 5 Supply Voltage V DS100080 33 Input Bias Current vs Supply Voltage
7. 0 069 10 254 0 508 lt 1 348 1 753 8 MAX TYP 0 004 0 010 ALL LEADS 0 102 0 254 L i SEATING Y PLANE 8 20000010 Wu 0 014 0 020 0 203 0 254 0 016 0 050 0 356 0 356 0 508j TYP ALL LEADS 0 004 0 406 1 270 0 102 TYP ALL LEADS ALL LEAD TIPS REV H 14 Pin Small Outline Order Number LMV339M and LMV339MX NS Package Number M14A www national com 20 Physical Dimensions inches millimeters unless otherwise noted Continued 7 72 TYP 1 4 16 TYP 2 MD LAND PATTERN RECOMMENDATION SEE DETAIL A 2 0 2 0 9 210 1 ALL LEAD TIPS 1 1 MAX E 0 10 0 05 TYP 0 19 0 30 TYP ERL DIMENSIONS ARE IN MILLIMETERS 09 89 SEATING PLANE 0 6 0 1 DETAIL A TYPICAL SCALE 40X BG cO MTC14 REV 14 Pin TSSOP Order Number LMV339MT and LMV339MTX NS Package Number MTC14 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 AND GENERAL COUNSEL 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 prop
8. 0 O0 LMV3310 00 Q9 vationat Semiconductor LMV331 Single LMV393 Dual LMV339 Quad General Purpose Low Voltage TinyPack Comparators General Description The LMV393 and LMV339 are low voltage 2 7 5V versions of the dual and quad comparators LM393 339 which are specified at 5 30V The LMV331 is the single version which is available in space saving SC70 5 and SOT23 5 packages SC70 5 is approximately half the size of SOT23 5 The LMV393 is available in 8 pin SOIC and 8 pin MSOP LMV339 is available in 14 pin SOIC and 14 pin TSSOP The LMV331 393 339 is the most cost effective solution where space low voltage low power and price are the pri mary specification in circuit design for portable consumer products They offer specifications that meet or exceed the familiar LM393 339 at a fraction of the supply current The chips are built with National s advanced Submicron Silicon Gate BiCMOS process The LMV331 393 339 have bipolar input and output stages for improved noise perfor mance August 1999 Features For 5V Supply Typical Unless Otherwise Noted m Space Saving SC70 5 Package 2 0 x 2 1 x 1 0 mm Space Saving SOT23 5 Package 3 00 x 3 01 x 1 43 mm Guaranteed 2 7V and 5V Performance Industrial Temperature Range 40 C to 85 C Low Supply Current Input Common Mode Voltage Range Includes Ground Low Output Saturation Voltage 200 mV Applications Mobile Communications Notebooks
9. 331 339 393 120V Differential Input Voltage Supply Voltage Voltage on any pin 5 5V referred to pin Soldering Information Infrared or Convection 20 sec 235 C Storage Temp Range 65 C to 150 C Junction Temperature Note 3 150 C 2 7V DC Electrical Characteristics Unless otherwise specified all limits guaranteed for T 25 C V 2 7V V OV Boldface limits apply at the temperature Operating Ratings oe 1 Supply Voltage Temperature Range LMV393 LMV339 LMV331 Thermal Resistance 0 4 M Package 8 pin Surface Mount M Package 14 pin Surface Mount Package 14 pin TSSOP MAAO5 Package 5 pin SC70 5 M05A Package 5 pin SOT23 5 MM Package 8 pin Mini Surface Mount 2 7N to 5 0V 40 C lt Ty lt 85 C 190 C W 145 C W 155 C W 478 C W 265 C W 235 C W extremes Symbol Parameter Conditions Typ LMV331 Units Note 4 393 339 Limit Note 5 Vos Input Offset Voltage TCVos Input Offset Voltage Average Drift lg Input Bias Current los Input Offset Current Vom Input Voltage Range 2 0 lo Sink Current mA min is Supply Current max LMV393 140 max Both Comparators LMV339 140 200 max All four Comparators Output Leakage Current 003 1 max 2 7V AC Electrical Characteristics Ty 25 C V 2 7V 5 1 V OV Symbol Parameter Conditions Typ Units teu Propagation Delay High to Low ns ns Propagation Delay Low t
10. ND PATTERN RECOMMENDATION 0 9 R0 025 MIN GAGE PLANE R0 025 MIN cx L LAA SEATING PLANE i 0 0 1 E 0 1 0 20 09 59 TYP 0 8 1 1 0 40 0 05 0 515 DIMENSIONS ARE IN MILLIMETERS MAAOSA REV B 5 Pin SC70 5 Tape and Reel Order Number LMV331M7 and LMV331M7X NS Package Number MAA05A www national com 16 Physical Dimensions inches millimeters unless otherwise noted Continued SYMM 0 112 0 118 Y 2 84 3 00 mm UY 0 102 2 59 0 060 0 066 1 52 1 68 NN S 0 039 lt 1 0 99 1 2 3 1 1 0 0145 0 0195 0 027 0 0375 4 0 57 0 50 0 69 0 95 i LAND PATTERN RECOMMENDATION 0 0050 0 0075 0 13 0 19 TP j yo A 0 038 0 048 0 036 0 044 0 97 1 22 0 91 1 12 i do L 09 109 TYP ta 0 025 0 002 0 006 0 64 0 140 0 0215 0 05 0 15 0 36 0 55 5 4 1 ds PLANE MAOSB REV B 5 Pin SOT23 5 Tape and Reel Order Number LMV331M5 and LMV331M5X NS Package Number MA05B www national com Physical Dimensions inches millimeters unless otherwise noted Continued 0 189 0 197 4 800 5 004 _ 8 7 8 5 0 228 0 244 5 791 6 188 0 010 max N 0 258 ECC 2 3 58 IDENT 30 0150 0157 3 810 3 988 0 053 0 069 0 010 0 020 y 45 1 346 1 753 0 254 0 508 dnie 0 004 0 010
11. at the inverting input is less than Va the voltage at the non inverting node of the com parator Vi lt Va the output voltage is high for simplicity assume V switches as high as V The three network re sistors can be represented as R Rs in series with Ro The lower input trip voltage V4 is defined as Le Vcc R2 Ry Rz When Vin is greater than Va Vi Va the output voltage is low very close to ground In this case the three network re sistors can be presented as R R in series with R4 The up per trip voltage Vo is defined as _ 82 R3 92 R R R The total hysteresis provided by the network is defined as AV Var To assure that the comparator will always switch fully to Vec and not be pulled down by the load the resistors values should be chosen as follow Rout up lt lt Rioad and R gt Rout up www national com Application Circuits continued RPuLL uP 3 KN R1 R3 Vai R2 Vo Va2 Vai 0 1 67 3 33 Vin Vo LOW Vcc R1 Va2 R2 R3 DS100080 25 FIGURE 2 Inverting Comparator with Hysteresis Non Inverting Comparator with Hysteresis Non inverting comparator with hysteresis requires a two re sistor network and a voltage reference V at the inverting input When Vin is low the output is also low For the output to switch from low to high Vin must rise up to where Vi is calculated by _ Vref T R2 Vint R When V is high the o
12. charged up to value equal to the voltage at the positive input V4 the comparator output will switch Vaz Will be given by A o n al R2 Vai 2V 3 When the output switches to ground the value of V is re duced by the hysteresis network to a value given by Vaz Vec 3 Capacitor must now discharge through R4 towards ground The output will return to its high state when the volt age across the capacitor has discharged to a value equal to For the circuit shown the period for one cycle of oscillation will be twice the time it takes for a single RC circuit to charge up to one half of its final value The time to charge the ca pacitor can be calculated from Where Vmax is the max applied potential across the capaci tor 2V 3 and 2 3 One period will be given by 1 freq 2t or calculating the exponential gives 1 freq 2 0 694 R4 C Resistors and must be at least two times larger than Rs to insure that V will go all the way up to Vec in the high state The frequency stability of this circuit should strictly be a function of the external components Free Running Multivibrator A simple yet very stable oscillator that generates a clock for slower digital systems can be obtained by using a resonator as the feedback element It is similar to the free running mul tivibrator except that the positive feedback is obtained through a quartz c
13. erly 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 National Semiconductor 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 Corporation Europe Americas Fax 49 0 1 80 530 85 86 Tel 1 800 272 9959 Email europe support nsc com Fax 1 800 737 7018 Deutsch Tel 49 0 1 80 530 85 85 Email support nsc com English Tel 49 0 1 80 532 78 32 Francais Tel 49 0 1 80 532 93 58 www national com Italiano Tel 49 0 1 80 534 16 80 National Semiconductor Asia Pacific Customer Response Group Tel 65 2544466 Fax 65 2504466 Email sea support nsc com National Semiconductor Japan Ltd Tel 81 3 5639 7560 Fax 81 3 5639 7507 National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications siojeseduo4y yoedAul esoding pend GESANT IENA E6EAINT 6 LESAN
14. ication continued TAPE DIMENSIONS 0 061 0 002 TYP 1 55 0 05 0 157 0 079 0 002 TYP 0 069 2 0 05 0045 175 CAVITY SYMM B F TANGENT GAGE LINE POINTS R0 012 TYP i 0 3 typ ALL INSIDE RADII 20 041 0 002 TYP i 0 012 1 04 0 05 DIRECTION OF FEED 0 3 GAGE LINE SECTION B B A TYP TANGENT POINTS CAVITY 0 012 GAGE LINE SYMM 0 3 ALL INSIDE RADII 5 q AT GAGE LINE SECTION A A BEND RADIUS NOT TO SCALE DS100080 45 8 mm 0 130 0 124 0 130 0 126 0 138 0 002 0 055 0 004 0 157 0 315 0 012 3 3 3 15 3 3 3 2 3 5 0 05 1 4 0 11 4 8 0 3 Tape Size DIMA DIM Ao DIMB DIM Bo DIM F DIM Ko DIM P1 DIM W www national com 14 SOT 23 5 Tape and Reel Specification continued REEL DIMENSIONS TAPE SLOT DETAIL X DETAIL X SCALE 3X i Ws Wo DS100080 46 8 mm 7 00 0 059 0 512 0 795 2 165 0 331 0 059 0 000 0 567 W1 0 078 0 039 330 00 1 50 13 00 20 20 55 00 8 40 1 50 0 00 14 40 W1 2 00 1 00 Tape Size A B C D N W1 W2 W3 www national com Physical Dimensions inches millimeters unless otherwise noted SYMM 0 65 1 9 mt te 0 75 Re 1 E AM 5 ex 0 15 0 3 0 4 o Da BOO H 1 3 LA
15. ime between pulses can be found from R4 7 1M FOR LARGE RATIOS OF R1 R2 D1 CAN BE OMITTED DS100080 9 FIGURE 7 Pulse Generator Vy Vmax 1 e S ROT rise time Vi Vmax ac a Rab fall time Where 2 Vec Vmax 7 3 and e Vimax _ Which gives 1 2 t is then given by d e e U RsCi 2 Solving these equations for t and t t R C In2 te 5 1 2 These terms will have a slight error due to the fact that V max is not exactly equal to 2 3 Voc but is actually reduced by the diode drop to 22 Vmax Va gold gt e RIO _ e v RsCi Positive Peak Detector Positive peak detector is basically the comparator operated as a unit gain follower with a large holding capacitor from the output to ground Additional transistor is added to the output to provide a low impedance current source When the output of the comparator goes high current is passed through the transistor to charge up the capacitor The only discharge path will be the 1M ohm resistor shunting C1 and any load that is connected to the output The decay time can be al tered simply by changing the 1M ohm resistor The output should be used through a high impedance follower to a avoid loading the output of the peak detector Vcc DS100080 17 FIGURE 8 Positive Peak Detector Negative Peak Detector For the negative detector the output transistor of the com parator acts as a low impedance current sink The only dis
16. o High ns ns www national com 5V DC Electrical Characteristics Unless otherwise specified all limits guaranteed for T 25 C V 5V V OV Boldface limits apply at the temperature extremes Symbol Parameter Conditions Typ LMV331 Units Note 4 393 339 Limit Note 5 Vos Input Offset Voltage TCVos Input Offset Voltage Average Drift lg Input Bias Current los Input Offset Current Vom Input Voltage Range 0 1 V 4 2 V A Voltage Gain a a Veat Saturation Voltage lai 4 mA 400 mV 700 max lo Output Sink Current Vo lt 1 5V 84 10 mA ls Supply Current LMV331 60 120 max 150 Both Comparators LMV339 300 max All four Comparators 350 Output Leakage Current 003 1 5V AC Electrical Characteristics Ty 25 C V 5V 5 1 V OV Symbol Parameter Conditions Typ Units Note 4 teur Propagation Delay High to Low Input Overdrive 2 10 mV 600 ns 200 ns Propagation Delay Low to High 450 ns 300 ns Note 1 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur Operating Ratings indicate conditions for which the device is in tended 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 5kQ in series with 100 pF Machine model 2000 in series with 100 pF Note 3 The maximum power
17. rystal The circuit oscillates when the transmission through the crystal is at a maximum so the crystal in its series resonant mode The value of and R equal so that the comparator will switch symmetrically about V 2 The RC constant of and C is set to be several times greater than the period of the oscillating frequency insuring a 50 duty cycle by main taining a DC voltage at the inverting input equal to the abso lute average of the output waveform When specifying the crystal be sure to order series resonant with the desired temperature coefficient CRYSTAL R2 200k f 100 kHz DS100080 7 FIGURE 6 Crystal controlled Oscillator www national com Application Circuits continued Pulse generator with variable duty cycle The pulse generator with variable duty cycle is just a minor modification of the basic square wave generator Providing a separate charge and discharge path for capacitor gener ates a variable duty cycle One path through and D will charge the capacitor and set the pulse width t The other path R and D will discharge the capacitor and set the time between pulses to By varying resistor R the time between pulses of the gen erator can be changed without changing the pulse width Similarly by varying R3 the pulse width will be altered with out affecting the time between pulses Both controls will change the frequency of the generator The pulse width and t
18. tor output stage which requires a pull up resistor to a positive supply voltage for the output to switch properly When the internal output transistor is off the output voltage will be pulled up to the external positive voltage The output pull up resistor should be chosen high enough so as to avoid excessive power dissipation yet low enough to supply enough drive to switch whatever load circuitry is used on the comparator output On the LMV331 393 339 the pull up resistor should range between 1k to 10kQ The comparator compares the input voltage Vin at the non inverting pin to the reference voltage at the invert ing pin If Vi is less than the output voltage V is at the saturation voltage On the other hand if Vi is greater than Vier the output voltage Vo is at DS100080 26 vt Vin 3 0k Vo VREF DS100080 4 FIGURE 1 Basic Comparator Comparator with Hysteresis The basic comparator configuration may oscillate or produce a noisy output if the applied differential input voltage is near the comparator s offset voltage This usually happens when the input signal is moving very slowly across the compara tor s switching threshold This problem can be prevented by the addition of hysteresis or positive feedback Inverting Comparator with Hysteresis The inverting comparator with hysteresis requires a three re sistor network that are referenced to the supply voltage V of the comparator When Vin
19. utput is also high to make the com parator switch back to it s low state Vin must equal e fore V4 will again equal Vi can be calculated by Vret Ry R2 7 Ry in2 R3 The hysteresis of this circuit is the difference between V and Vinz AVin VecR1 Re Hec 5V Veer 2 5V RPULL UP 3 KO R Vn LOAD 330 R2 1MQ DS100080 22 Vg HIGH Vg LOW Vec Vint 5V R2 R1 Va VREF Va Veer Vo Vin 2 R1 R2 1 675 3 325 Vin Vin 2 DS100080 23 www national com Application Circuits continued Square Wave Oscillator Comparators are ideal for oscillator applications This square wave generator uses the minimum number of components The output frequency is set by the RC time constant of the capacitor and the resistor the negative feedback R4 The maximum frequency is limited only by the large signal propagation delay of the comparator in addition to any ca pacitive loading at the output which would degrade the out put slew rate 1 100 kHz Va 85 100 DS100080 8 DS100080 24 FIGURE 5 Squarewave Oscillator To analyze the circuit assume that the output is initially high For this to be true the voltage at the inverting input V has to be less than the voltage at the non inverting input V4 For V to be low the capacitor C has to be discharged and will charge up through the negative feedback resistor R4 When it has

National LMV331 LMV393 LMV339 handbook

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