SM72375 SM72375 SolarMagic Dual Micropower Rail-To-Rail Input CMOS Comparator with Open Drain Output Literature Number: SNIS155C May 11, 2011 SM72375 SolarMagic Dual Micropower Rail-To-Rail Input CMOS Comparator with Open Drain Output General Description Features The SM72375 is an ultra low power dual comparator with a maximum 10 μA/comparator power supply current. It is designed to operate over a wide range of supply voltages, with a minimum supply voltage of 2.7V. The common mode voltage range of the SM72375 exceeds both the positive and negative supply rails, a significant advantage in single supply applications. The open drain output of the SM72375 allows for wired-OR configurations. The open drain output also offers the advantage of allowing the output to be pulled to any voltage rail up to 15V, regardless of the supply voltage of the SM72375. The SM72375 is targeted for systems where low power consumption is the critical parameter. Guaranteed operation at supply voltages of 2.7V and rail-to-rail performance makes this comparator ideal for battery-powered applications. ■ Renewable Energy Grade (Typical unless otherwise noted) ■ Low power consumption (max): IS = 10 μA/comp ■ Wide range of supply voltages: 2.7V to 15V ■ Rail-to-Rail Input Common Mode Voltage Range ■ Open drain output ■ Short circuit protection: 40 mA ■ Propagation delay (@VS = 5V, 100 mV overdrive): 5 μs ■ −40°C to 125°C temperature range Applications ■ ■ ■ ■ Metering systems RC timers Alarm and monitoring circuits Window comparators, multivibrators Connection Diagram 8-Pin MSOP 30141801 Top View Ordering Information Package 8-Pin MSOP Part Number Package Marking Transport Media SM72375MMX S375 3500 Units in Tape and Reel SM72375MM S375 1000 Units in Tape and Reel SM72375MME S375 250 Units in Tape and Reel © 2011 National Semiconductor Corporation 301418 NSC Drawing MUA08A www.national.com SM72375 SolarMagic Dual Micropower Rail-To-Rail Input CMOS Comparator with Open Drain Output PRELIMINARY SM72375 Current at Power Supply Pin, 40 mA SM72375 Lead Temperature (Soldering, 10 seconds) 260°C Storage Temperature Range −65°C to +150°C Junction Temperature (Note 4) 150°C 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) 1.5 kV Differential Input Voltage (V+)+0.3V to (V−)−0.3V Voltage at Input/Output Pin (V+)+0.3V to (V−)−0.3V Supply Voltage (V+–V−) 16V Current at Input Pin (Note 8) ±5 mA Current at Output Pin (Note 3, Note ±30 mA 7) Operating Ratings (Note 1) 2.7 ≤ VS ≤ 15V Supply Voltage – 40°C ≤ TA ≤ +125°C Temperature Range Thermal Resistance (θJA) 8-Pin MSOP 172°C/W 2.7V Electrical Characteristics Unless otherwise specified, all limits guaranteed for TA = 25°C, V+ = 2.7V, V− = 0V, VCM = V+/2. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (Note 6) Tpy (Note 5) Ma x (Note 6) Units 3 10 13 mV VOS Input Offset Voltage TCVOS Input Offset Voltage Temperature Drift 2.0 Input Offset Voltage Average Drift (Note 10) 3.3 IB Input Current 0.02 pA IOS Input Offset Current 0.01 pA CMRR Common Mode Rejection Ratio 75 dB PSRR Power Supply Rejection Ratio ±1.35V < VS < ±7.5V 80 dB AV Voltage Gain (By Design) 100 dB VCM Input Common-Mode Voltage Range CMRR > 55 dB μV/Month 2.9 2.7 3.0 −0.3 −0.2 0.0 V VOL Output Voltage Low ILOAD = 2.5 mA 0.2 0.3 0.45 V IS Supply Current For Both Comparators 12 20 25 μA ILeakage Output Leakage Current VIN(+) = 0.5V, VIN(−) = 0V, VO = 15V 500 0.1 nA 5.0V and 15.0V Electrical Characteristics Unless otherwise specified, all limits guaranteed for TA = 25°C, V+ = 5.0V and 15.0V, V− = 0V, VCM = V+/2. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (Note 6) Typ (Note 5) Max (Note 6) 3 10 13 VOS Input Offset Voltage TCVOS Input Offset Voltage Temperature Drift V+ = 5V 2.0 V+ 0.4 Input Offset Voltage Average Drift V+ = 5V (Note 10) 3.3 V+ 4.0 IB = 15V = 15V (Note 10) Units mV μV/°C μV/Month Input Current V = 5V 0.04 pA IOS Input Offset Current V+ 0.02 pA CMRR Common Mode V+ = 5V 75 dB Rejection Ratio V+ 82 dB www.national.com = 5V = 15V 2 Parameter Min (Note 6) Conditions Typ (Note 5) Max (Note 6) Units PSRR Power Supply Rejection Ratio ±2.5V < VS < ±5V 80 dB AV Voltage Gain (By Design) 100 dB Input Common-Mode Voltage Range V+ VCM = 5.0V CMRR > 55 dB 5.2 5.0 5.3 −0.3 V+ = 15.0V CMRR > 55 dB VOL Output Voltage Low 15.2 15.0 −0.2 0.0 15.3 −0.3 −0.2 0.0 V+ = 5V ILOAD = 5 mA 0.2 0.4 0.55 V+ = 15V ILOAD = 5 mA 02 0.4 0.55 12 20 25 IS Supply Current For Both Comparators (Output Low) ISC Short Circuit Current V+ = 15V, Sinking, VO = 12V (Note 7) 45 V V μA mA AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TA = 25°C, V+ = 5V, V− = 0V, VCM = VO = V+/2. Boldface limits apply at the temperature extreme. Symbol Parameter Min (Note 6) Conditions tRISE Rise Time f = 10 kHz, CL = 50 pF, Overdrive = 10 mV (Note 9) tFALL Fall Time f = 10 kHz, CL = 50 pF, (Note 9) tPHL Propagation Delay (High to Low) f = 10 kHz, CL = 50 pF (Note 9) V+ = 2.7V, f = 10 kHz, CL = 50 pF (Note 9) tPLH Propagation Delay (Low to High) f = 10 kHz, CL = 50 pF (Note 9) V+ = 2.7V, f = 10 kHz, CL = 50 pF (Note 9) Typ (Note 5) Max (Note 6) Units 0.3 μs 0.3 μs 10 mV 10 100 mV 4 10 mV 10 100 mV 4 10 mV 10 100 mV 4 10 mV 8 μs μs μs μs 100 mV 4 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 kΩ in series with 100 pF. The output pins of the two comparators (pin 1 and pin 7) have an ESD tolerance of 1.5 kV. All other pins have an ESD tolerance of 2 kV. 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. Output currents in excess of ±30 mA over long term may adversely affect reliability. Note 4: 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 5: Typical Values represent the most likely parametric norm. Note 6: All limits are guaranteed by testing or statistical analysis. Note 7: Do not short circuit output to V+, when V+ is > 12V or reliability will be adversely affected. Note 8: Limiting input pin current is only necessary for input voltages that exceed absolute maximum input voltage ratings. Note 9: CL inlcudes the probe and jig capacitance. The rise time, fall time and propagation delays are measured with a 2V input step. Note 10: Input offset voltage Average Drift is calculated by dividing the accelerated operating life drift average by the equivalent operational time. The input offset voltage average drift represents the input offset voltage change at worst-case input conditions. 3 www.national.com SM72375 Symbol SM72375 Typical Performance Characteristics V+ = 5V, Single Supply, TA = 25°C unless otherwise specified Input Current vs. Common-Mode Voltage Input Current vs. Common-Mode Voltage 30141805 30141806 Input Current vs. Common-Mode Voltage Input Current vs. Temperature 30141808 30141807 ΔVOS vs ΔVCM, VS = 5V ΔVOS vs ΔVCM, VS = 2.7V 30141809 www.national.com 30141810 4 SM72375 ΔVOS vs ΔVCM, VS = 15V Response Time for Overdrive (tPLH) 30141817 30141811 Response Time for Overdrive (tPHL) Response Time for Overdrive (tPLH) 30141818 30141819 Response Time for Overdrive (tPHL) Response Time for Overdrive (tPLH) 30141820 30141821 5 www.national.com SM72375 Response Time for Overdrive (tPHL) Response Time vs. Capacitive Load 30141822 30141823 Supply Current vs. Supply Voltage (Output High) Supply Current vs. Supply Voltage (Output Low) 30141834 30141833 Output Voltage vs. Output Current (Sinking) Output Voltage vs. Output Current (Sinking) 30141835 30141836 www.national.com 6 Output Short Circuit Current vs. Supply 30141838 30141837 Output Leakage vs. Output Voltage 30141839 7 www.national.com SM72375 Output Voltage vs. Output Current (Sinking) SM72375 Application Information 1.0 INPUT COMMON-MODE VOLTAGE RANGE At supply voltages of 2.7V, 5V and 15V, the SM72375 has an input common-mode voltage range (CMVR) which exceeds both supplies. As in the case of operational amplifiers, CMVR is defined by the VOS shift of the comparator over the common-mode range of the device. A common-mode rejection ratio (CMRR, defined as ΔVOS/ΔVCM) of 75 dB (typical) implies a shift of < 1 mV over the entire common-mode range of the device. The absolute maximum input voltage at V+ = 5V is 200 mV beyond either supply rail at room temperature. 30141825 FIGURE 2. Even at Low-Supply Voltage of 2.7V, an Input Signal which Exceeds the Supply Voltages Produces No Phase Inversion at the Output At V+ = 2.7V, propagation delays are tPLH = 4 μs and tPHL = 4 μs with overdrives of 100 mV. Please refer to the performance curves for more extensive characterization. 3.0 OUTPUT SHORT CIRCUIT CURRENT The SM72375 has short circuit protection of 40 mA. However, it is not designed to withstand continuous short circuits, transient voltage or current spikes, or shorts to any voltage beyond the supplies. A resistor is series with the output should reduce the effect of shorts. For outputs which send signals off PC boards additional protection devices, such as diodes to the supply rails, and varistors may be used. 30141824 FIGURE 1. An Input Signal Exceeds the SM72375 Power Supply Voltages with No Output Phase Inversion 4.0 HYSTERESIS If the input signal is very noisy, the comparator output might trip several times as the input signal repeatedly passes through the threshold. This problem can be addressed by making use of hysteresis as shown below. A wide input voltage range means that the comparator can be used to sense signals close to ground and also to the power supplies. This is an extremely useful feature in power supply monitoring circuits. An input common-mode voltage range that exceeds the supplies, 20 fA input currents (typical), and a high input impedance makes the SM72375 ideal for sensor applications. The SM72375 can directly interface to sensors without the use of amplifiers or bias circuits. In circuits with sensors which produce outputs in the tens to hundreds of millivolts, the SM72375 can compare the sensor signal with an appropriately small reference voltage. This reference voltage can be close to ground or the positive supply rail. 2.0 LOW VOLTAGE OPERATION Comparators are the common devices by which analog signals interface with digital circuits. The SM72375 has been designed to operate at supply voltages of 2.7V, without sacrificing performance, to meet the demands of 3V digital systems. At supply voltages of 2.7V, the common-mode voltage range extends 200 mV (guaranteed) below the negative supply. This feature, in addition to the comparator being able to sense signals near the positive rail, is extremely useful in low voltage applications. www.national.com 30141826 FIGURE 3. Canceling the Effect of Input Capacitance The capacitor added across the feedback resistor increases the switching speed and provides more short term hysteresis. This can result in greater noise immunity for the circuit. 8 SM72375 BI-STABLE MULTIVIBRATOR Typical Applications UNIVERSAL LOGIC LEVEL SHIFTER The output of the SM72375 is the uncommitted drain of the output NMOS transistor. Many drains can be tied together to provide an output OR'ing function. An output pullup resistor can be connected to any available power supply voltage within the permitted power supply range. 30141830 FIGURE 6. Bi-Stable Multivibrator A bi-stable multivibrator has two stable states. The reference voltage is set up by the voltage divider of R2 and R3. A pulse applied to the SET terminal will switch the output of the comparator high. The resistor divider of R1, R4, and R5 now clamps the non-inverting input to a voltage greater than the reference voltage. A pulse applied to RESET will now toggle the output low. 30141827 FIGURE 4. Universal Logic Level Shifter The two 1 kΩ resistors bias the input to half of the power supply voltage. The pull-up resistor should go to the output logic supply. Due to its wide operating range, the SM72375 is ideal for the logic level shifting applications. ZERO CROSSING DETECTOR ONE-SHOT MULTIVIBRATOR 30141829 30141828 FIGURE 7. Zero Crossing Detector FIGURE 5. One-Shot Multivibrator A voltage divider of R4 and R5 establishes a reference voltage V1 at the non-inverting input. By making the series resistance of R1 and R2 equal to R5, the comparator will switch when VIN = 0. Diode D1 insures that V3 never drops below −0.7V. The voltage divider of R2 and R3 then prevents V2 from going below ground. A small amount of hysteresis is setup to ensure rapid output voltage transitions. A monostable multivibrator has one stable state in which it can remain indefinitely. It can be triggered externally to another quasi-stable state. A monostable multivibrator can thus be used to generate a pulse of desired width. The desired pulse width is set by adjusting the values of C2 and R4. The resistor divider of R1 and R2 can be used to determine the magnitude of the input trigger pulse. The SM72375 will change state when V1 < V2. Diode D2 provides a rapid discharge path for capacitor C2 to reset at the end of the pulse. The diode also prevents the non-inverting input from being driven below ground. 9 www.national.com SM72375 Figure 8 shows the application of the SM72375 in a square wave generator circuit. The total hysteresis of the loop is set by R1, R2 and R3. R4 and R5 provide separate charge and discharge paths for the capacitor C. The charge path is set through R4 and D1. So, the pulse width t1 is determined by the RC time constant of R4 and C. Similarly, the discharge path for the capacitor is set by R5 and D2. Thus, the time t2 between the pulses can be changed by varying R5, and the pulse width can be altered by R4. The frequency of the output can be changed by varying both R4 and R5. OSCILLATOR 30141831 FIGURE 8. Square Wave Generator Time Delay Generator 30141832 FIGURE 9. Time Delay Generator The circuit shown above provides output signals at a prescribed time interval from a time reference and automatically resets the output when the input returns to ground. Consider the case of VIN = 0. The output of comparator 4 is also at ground. This implies that the outputs of comparators 1, 2, and 3 are also at ground. When an input signal is applied, the output of comparator 4 swings high and C charges exponentially www.national.com through R. This is indicated above. The output voltages of comparators 1, 2, and 3 swtich to the high state when VC1 rises above the reference voltages VA, VB and VC. A small amount of hysteresis has been provided to insure fast switching when the RC time constant is chosen to give long delay times. 10 SM72375 Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin MSOP NS Package Number MUA08A 11 www.national.com SM72375 SolarMagic Dual Micropower Rail-To-Rail Input CMOS Comparator with Open Drain Output Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise® Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise® Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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