LMV331 Single / LMV393 Dual / LMV339 Quad General Purpose, Low Voltage, TinyPack Comparators General Description Features 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. The LMV339 is available in 14-pin SOIC and 14-pin TSSOP. (For 5V Supply, Typical Unless Otherwise Noted) The LMV331/393/339 is the most cost-effective solution where space, low voltage, low power and price are the primary 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 performance. n Industrial Temperature Range n Space Saving SC70-5 Package (2.0 x 2.1 x 1.0 mm) n Space Saving SOT23-5 Package (3.00 x 3.01 x 1.43 mm) n Guaranteed 2.7V and 5V Performance n Low Supply Current −40˚C to +85˚C 60µA/Channel n Input Common Mode Voltage Range Includes Ground n Low Output Saturation Voltage 200 mV Applications n n n n n Mobile Communications Notebooks and PDA’s Battery Powered Electronics General Purpose Portable Device General Purpose Low Voltage Applications Connection Diagrams 5-Pin SC70-5/SOT23-5 14-Pin SO/TSSOP DS100080-1 Top View 8-Pin SO/MSOP DS100080-3 Top View DS100080-2 Top View © 1999 National Semiconductor Corporation DS100080 www.national.com LMV331 Single / LMV393 Dual / LMV339 Quad General Purpose, Low Voltage, TinyPack Comparators August 1999 Ordering Information Temperature Range Package 5-pin SC70-5 5-pin SOT23-5 8-pin Small Outline 8-pin MSOP 14-pin Small Outline 14-pin TSSOP www.national.com Industrial −40˚C to +85˚C Packaging Marking Transport Media LMV331M7 C13 1k Units Tape and Reel LMV331M7X C13 3k Units Tape and Reel LMV331M5 C12 1k Units Tape and Reel LMV331M5X C12 3k Units Tape and Reel LMV393M LMV393M Rails LMV393MX LMV393M 2.5k Units Tape and Reel LMV393MM LMV393 1k UnitsTape and Reel LMV393MMX LMV393 3.5k Units Tape and Reel LMV339M LMV339M Rails LMV339MX LMV339M 2.5k Units Tape and Reel LMV339MT LMV339MT Rails LMV339MTX LMV339MT 2.5k Units Tape and Reel 2 NSC Drawing MAA05 MA05B M08A MUA08A M14A MTC14 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 2.7V to 5.0V Temperature Range −40˚C ≤ TJ ≤ +85˚C LMV393, LMV339, LMV331 ESD Tolerance (Note 2) Human Body Model Thermal Resistance (θJA) LMV331/ 393/ 339 800V Machine Model LMV331/339/393 120V ± Supply Voltage Differential Input Voltage 5.5V Voltage on any pin (referred to V− pin) Soldering Information Infrared or Convection (20 sec) Storage Temp. Range 235˚C −65˚C to +150˚C Junction Temperature (Note 3) 150˚C M Package, 8-pin Surface Mount 190˚C/W M Package, 14-pin Surface Mount 145˚C/W MTC Package, 14-pin TSSOP 155˚C/W MAA05 Package, 5-pin SC70-5 478˚C/W M05A Package 5 -pin SOT23-5 265˚C/W MM Package, 8-pin Mini Surface Mount 235˚C/W 2.7V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.7V, V− = 0V. Boldface limits apply at the temperature extremes. Symbol Parameter VOS Input Offset Voltage TCVOS Input Offset Voltage Average Drift IB Input Bias Current IOS Input Offset Current VCM Input Voltage Range Conditions Typ (Note 4) LMV331/ 393/339 Limit (Note 5) 1.7 7 Units mV max 5 µV/˚C 10 250 400 5 50 150 nA max nA max −0.1 V 2.0 V Isink ≤ 1mA 200 mV VSAT Saturation Voltage IO Output Sink Current VO ≤ 1.5V 23 5 mA min IS Supply Current LMV331 40 100 µA max LMV393 Both Comparators 70 140 µA max LMV339 All four Comparators 140 200 µA max .003 1 µA max Output Leakage Current 2.7V AC Electrical Characteristics TJ = 25˚C, V+ = 2.7V, RL = 5.1 kΩ, V− = 0V. Symbol tPHL tPLH Parameter Propagation Delay (High to Low) Propagation Delay (Low to High) Conditions Typ (Note 4) Units Input Overdrive = 10 mV Input Overdrive = 100 mV 1000 ns 350 ns Input Overdrive = 10 mV Input Overdrive = 100 mV 500 ns 400 ns 3 www.national.com 5V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Typ (Note 4) LMV331/ 393/339 Limit (Note 5) Units 7 9 mV max VOS Input Offset Voltage 1.7 TCVOS Input Offset Voltage Average Drift 5 IB Input Bias Current IOS Input Offset Current VCM Input Voltage Range µV/˚C 25 250 400 2 50 150 nA max nA max −0.1 V 4.2 AV Voltage Gain Vsat Saturation Voltage IO IS V 50 20 Isink ≤ 4 mA 200 400 700 Output Sink Current VO ≤ 1.5V 84 10 mA Supply Current LMV331 60 120 150 µA max LMV393 Both Comparators 100 200 250 µA max LMV339 All four Comparators 170 300 350 µA max .003 1 µA max Output Leakage Current V/mV min mV max 5V AC Electrical Characteristics TJ = 25˚C, V+ = 5V, RL = 5.1 kΩ, V− = 0V. Symbol tPHL tPLH Parameter Propagation Delay (High to Low) Propagation Delay (Low to High) Conditions Typ (Note 4) Units Input Overdrive = 10 mV Input Overdrive = 100 mV 600 ns 200 ns Input Overdrive = 10 mV Input Overdrive = 100 mV 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 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, 1.5kΩ in series with 100 pF. Machine model, 200Ω in series with 100 pF. Note 3: The maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(max) - TA)/θJA. 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. www.national.com 4 Typical Performance Characteristics Supply Current vs Supply Voltage Output High (LMV331) Unless otherwise specified, VS = +5V, single supply, TA = 25˚C Supply Current vs Supply Voltage Output Low (LMV331) DS100080-34 Output Voltage vs Output Current at 2.7 Supply Output Voltage vs Output Current at 5V Supply DS100080-33 Input Bias Current vs Supply Voltage DS100080-37 Response Time vs Input Overdrives Negative Transition DS100080-36 DS100080-38 Response Time for Input Overdrive Positive Transition DS100080-42 Response Time vs Input Overdrives Negative Transition Response Time for Input Overdrive Positive Transition DS100080-43 DS100080-41 5 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 signals to a digital output. The LMV331/393/339 have an open-collector 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 10kΩ. DS100080-26 The comparator compares the input voltage (Vin) at the non-inverting pin to the reference voltage (Vref) at the inverting pin. If Vin is less than Vref, the output voltage (Vo) is at the saturation voltage. On the other hand, if Vin is greater than Vref, the output voltage (Vo) is at Vcc.. 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 comparator’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 resistor network that are referenced to the supply voltage Vcc of the comparator. When Vin at the inverting input is less than Va, the voltage at the non-inverting node of the comparator (Vin < Va), the output voltage is high (for simplicity assume Vo switches as high as Vcc). The three network resistors can be represented as R1//R3 in series with R2. The lower input trip voltage Va1 is defined as When Vin is greater than Va (Vin Va), the output voltage is low very close to ground. In this case the three network resistors can be presented as R2//R3 in series with R1. The upper trip voltage Va2 is defined as The total hysteresis provided by the network is defined as ∆Va = Va1 - Va2 To assure that the comparator will always switch fully to Vcc and not be pulled down by the load the resistors values should be chosen as follow: Rpull-up << Rload and R1 > Rpull-up. 7 www.national.com Application Circuits (Continued) DS100080-25 FIGURE 2. Inverting Comparator with Hysteresis Non-Inverting Comparator with Hysteresis Non inverting comparator with hysteresis requires a two resistor network, and a voltage reference (Vref) 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 Vin1 where Vin1 is calculated by When Vin is high, the output is also high, to make the comparator switch back to it’s low state, Vin must equal Vref before Va will again equal Vref. Vin can be calculated by: DS100080-22 The hysteresis of this circuit is the difference between Vin1 and Vin2. ∆Vin = VccR1/R2 DS100080-23 www.national.com 8 Application Circuits Capacitor C1 must now discharge through R4 towards ground. The output will return to its high state when the voltage across the capacitor has discharged to a value equal to Va2. 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 capacitor can be calculated from (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 C1 and the resistor in the negative feedback R4. The maximum frequency is limited only by the large signal propagation delay of the comparator in addition to any capacitive loading at the output, which would degrade the output slew rate. Where Vmax is the max applied potential across the capacitor = (2Vcc/3) and VC = Vmax/2 = VCC/3 One period will be given by: 1/freq = 2t or calculating the exponential gives: 1/freq = 2(0.694) R4 C1 Resistors R3 and R4 must be at least two times larger than R5 to insure that Vo will go all the way up to Vcc 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 multivibrator, except that the positive feedback is obtained through a quartz crystal. The circuit oscillates when the transmission through the crystal is at a maximum, so the crystal in its series-resonant mode. The value of R1 and R2 are equal so that the comparator will switch symmetrically about +Vcc/2. The RC constant of R3 and C1 is set to be several times greater than the period of the oscillating frequency, insuring a 50% duty cycle by maintaining a DC voltage at the inverting input equal to the absolute average of the output waveform. When specifying the crystal, be sure to order series resonant with the desired temperature coefficient 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 Vc has to be less than the voltage at the non-inverting input Va. For Vc to be low, the capacitor C1 has to be discharged and will charge up through the negative feedback resistor R4. When it has charged up to value equal to the voltage at the positive input Va1, the comparator output will switch. Va1 will be given by: If: R1 = R2 = R3 Then: Va1 = 2Vcc/3 When the output switches to ground, the value of Va is reduced by the hysteresis network to a value given by: Va2 = Vcc/3 DS100080-7 FIGURE 6. Crystal controlled Oscillator 9 www.national.com Application Circuits These terms will have a slight error due to the fact that Vmax is not exactly equal to 2/3 VCC but is actually reduced by the diode drop to: (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 C1 generates a variable duty cycle. One path, through R2 and D2 will charge the capacitor and set the pulse width (t1). The other path, R1 and D1 will discharge the capacitor and set the time between pulses (t2). By varying resistor R1, the time between pulses of the generator can be changed without changing the pulse width. Similarly, by varying R2, the pulse width will be altered without affecting the time between pulses. Both controls will change the frequency of the generator. The pulse width and time between pulses can be found from: 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 altered 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. DS100080-9 FIGURE 7. Pulse Generator DS100080-17 FIGURE 8. Positive Peak Detector Negative Peak Detector: For the negative detector, the output transistor of the comparator acts as a low impedance current sink. The only discharge path will be the 1 MΩ resistor and any load impedance used. Decay time is changed by varying the 1 MΩ resistor Solving these equations for t1 and t2 t1 = R4C1ln2 t2 = R5C1ln2 www.national.com DS100080-18 FIGURE 9. Negative Peak Detector 10 Application Circuits (Continued) Driving CMOS and TTL The comparator’s output is capable of driving CMOS and TTL Logic circuits. DS100080-5 DS100080-11 FIGURE 10. Driving CMOS 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 Vcc, thereby reducing the reference voltage. A logic ″1″ at any of the inputs will produce a logic ″1″ at the output. 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 reference 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 recommended to improve the voltage margin when all but one of the inputs are high. 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 Vcc. If one or more of the comparators outputs goes low, the output Vo will go low. 11 www.national.com Application Circuits (Continued) DS100080-12 FIGURE 14. ORing the Outputs DS100080-13 FIGURE 15. Large Fan-In AND Gate www.national.com 12 SC70-5 Tape and Reel Specification DS100080-44 SOT-23-5 Tape and Reel Specification TAPE FORMAT Tape Section # Cavities Cavity Status Cover Tape Status Leader 0 (min) Empty Sealed (Start End) 75 (min) Empty Sealed Carrier 3000 Filled Sealed 250 Filled Sealed Trailer 125 (min) Empty Sealed (Hub End) 0 (min) Empty Sealed 13 www.national.com SOT-23-5 Tape and Reel Specification (Continued) TAPE DIMENSIONS DS100080-45 8 mm Tape Size www.national.com 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) DIM A DIM Ao DIM B DIM Bo DIM F DIM Ko DIM P1 DIM W 14 SOT-23-5 Tape and Reel Specification (Continued) REEL DIMENSIONS DS100080-46 8 mm Tape Size 7.00 0.059 0.512 0.795 2.165 330.00 1.50 A B 13.00 20.20 55.00 C D N 15 0.331 + 0.059/−0.000 0.567 W1+ 0.078/−0.039 8.40 + 1.50/−0.00 14.40 W1 + 2.00/−1.00 W1 W2 W3 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted 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) 5-Pin SOT23-5 Tape and Reel Order Number LMV331M5 and LMV331M5X NS Package Number MA05B 17 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 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) 8-Pin MSOP Order Number LMV393MM and LMV393MMX NS Package Number MUA08A 19 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 14-Pin Small Outline Order Number LMV339M and LMV339MX NS Package Number M14A www.national.com 20 inches (millimeters) unless otherwise noted (Continued) 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 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 Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: [email protected] www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: [email protected] Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 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 Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: [email protected] 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. LMV331 Single / LMV393 Dual / LMV339 Quad General Purpose, Low Voltage, TinyPack Comparators Physical Dimensions