SM73403 SM73403 Single General Purpose Voltage Comparator Literature Number: SNOSBA0 SM73403 Single General Purpose Voltage Comparator General Description Features The SM73403 is a single voltage comparator with an input common mode that includes ground. The SM73403 is designed to operate from a single 5V to 30V power supply or a split power supply. Its low supply current is virtually independent of the magnitude of the supply voltage. The SM73403 features an open collector output stage. This allows the connection of an external resistor at the output. The output can directly interface with TTL, CMOS and other logic levels, by tying the resistor to different voltage levels (level translator). The SM73403 is available in a space saving 5-Pin SOT23 package. (TA = 25°C. Typical values unless otherwise specified). ■ 5-Pin SOT23 package −40°C to +85°C ■ Industrial operating range ■ Single or dual power supplies 5V to 30V ■ Wide supply voltage range 300µA ■ Low supply current 7nA ■ Low input bias current ±1nA ■ Low input offset current ±2mV ■ Low input offset voltage 440ns (50mV overdrive) ■ Response time 0 to VS - 1.5V ■ Input common mode voltage Applications ■ ■ ■ ■ ■ Connection Diagram Photovoltaic electronics A/D converters Pulse, square wave generators Peak detector Industrial applications Typical Circuit 5-Pin SOT23 30159708 Top View 30159709 FIGURE 1. Inverting Comparator with Hysteresis Ordering Information Package Part Number Package Marking SM73403MF 5-Pin SOT-23 SM73403MFX SM73403MFE © 2011 National Semiconductor Corporation 301597 Transport Media NSC Drawing 1k Units Tape and Reel LLPB 3k Units Tape and Reel MF05A 250 Units Tape and Reel www.national.com SM73403 Single General Purpose Voltage Comparator October 4, 2011 SM73403 Junction Temperature (Note 3) Soldering Information Infrared or Convection (20 sec.) Wave Soldering (10 sec.) 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 Machine Model VIN Differential Supply Voltages Voltage at Input Pins Storage Temperature Range Operating Ratings 2KV 200V 30V 30V or ±15V −0.3V to 30V −65°C to +150°C +150°C 235°C 260°C (Note 1) Supply Voltage, VS Temperature Range (Note 3) Package Thermal Resistance (Note 3) 5-Pin SOT23 5V to 30V −40°C to +85°C 168°C/W Electrical Characteristics Unless otherwise specified, all limits are guaranteed for TA = 25°C, VS = 5V, V− = 0V, VCM = V+/2 = VO. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min (Note 5) Typ (Note 4) Max (Note 5) Units VOS Input Offset Voltage VS = 5V to 30V, VO = 1.4V, VCM = 0V 2 7 10 mV IOS Input Offset Current VO = 1.4V, VCM = 0V 1.6 50 250 nA IB Input Bias Current VO = 1.4V, VCM = 0V 10 250 400 nA IS Supply Current RL = Open, VS = 5V 0.25 0.7 RL = Open, VS = 30V 0.30 2 IO Output Sink Current VIN+ = 1V,VIN− = 0V, VO = 1.5V ILEAKAGE Output Leakage Current VIN+ = 1V,VIN− = 0V, VO = 5V 6 VIN+ = 1V,VIN− = 0V, VO = 30V 1 VOL Output Voltage Low IO = −4mA, VIN+ = 0V,VIN− = 1V 180 VCM Common-Mode Input Voltage Range VS = 5V to 30V (Note 6) AV Voltage Gain VS = 15V, VO = 1.4V to 11.4V, mA 13 mA 0.1 nA 0 0 µA 400 700 VS - 1.5V VS - 2V 120 mV V V/mV RL > = 15kΩ connected to VS tPHL tPLH Propagation Delay (High to Low) Propagation Delay (Low to High) Input Overdrive = 5mV RL = 5.1kΩ connected to 5V, CL = 15pF 900 Input Overdrive = 50mV RL = 5.1kΩ connected to 5V, CL = 15pF 250 Input Overdrive = 5mV RL = 5.1kΩ connected to 5V, CL = 15pF 940 µs Input Overdrive = 50mV RL = 5.1kΩ connected to 5V, CL = 15pF 440 ns 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, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of JEDEC) Field-Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC). Note 3: The maximum power dissipation is a function of TJ(MAX), θJA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) - TA)/ θJA . All numbers apply for packages soldered directly onto a PC board. Note 4: Typical values represent the most likely parametric norm as determined at the time of characterization. Actual typical values may vary over time and will also depend on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material. Note 5: All limits are guaranteed by testing or statistical analysis. Note 6: The input common-mode voltage of either input should not be permitted to go below the negative rail by more than 0.3V. The upper end of the commonmode voltage range is VS - 1.5V at 25°C. www.national.com 2 TA = 25°C. Unless otherwise specified. Supply Current vs. Supply Voltage Input Bias Current vs. Supply Current 30159703 30159701 Output Saturation Voltage vs. Output Sink Current Input Offset Voltage vs. Supply Voltage 30159704 30159702 Response Time for Various Input Overdrives – tPHL Response Time for Various Input Overdrives – tPLH 30159705 30159706 3 www.national.com SM73403 Typical Performance Characteristics SM73403 Application Notes When input voltage (VIN) at the inverting node is less than non-inverting node (VT), the output is high. The equivalent circuit for the three resistor network is R1 in parallel with R3 and in series with R2. The lower threshold voltage VT1 is calculated by: Basic Comparators A comparator is quite often used to convert an analog signal to a digital signal. The comparator compares an 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 (V O) is low (VOL). However, if VIN is greater than VREF, the output voltage (VO) is high (VOH). Refer to Figure 2. VT1 = ((VS R2) / (((R1 R3) / (R1 + R3)) + R2)) When VIN is greater than VT, the output voltage is low. The equivalent circuit for the three resistor network is R2 in parallel with R3 and in series with R1. The upper threshold voltage VT2 is calculated by: VT2 = VS ((R2 R3) / (R2 + R3)) / (R1 + ((R2 R3) / (R2 + R3))) The hysteresis is defined as ΔVIN = VT1 – VT2 30159710 30159712 30159711 FIGURE 2. Basic Comparator Hysteresis The basic comparator configuration may oscillate or produce a noisy output if the applied differential input is near the comparator’s input offset voltage. This tends to occur when the voltage on the input is equal or very close to the other input voltage. Adding hysteresis can prevent this problem. Hysteresis creates two switching thresholds (one for the rising input voltage and the other for the falling input voltage). Hysteresis is the voltage difference between the two switching thresholds. When both inputs are nearly equal, hysteresis causes one input to effectively move quickly pass the other. Thus, effectively moving the input out of the region that oscillation may occur. For an inverting configured comparator, hysteresis can be added with a three resistor network and positive feedback. www.national.com 30159713 FIGURE 3. Inverting Configured Comparator – SM73403 4 SM73403 Input Stage The SM73403 has a bipolar input stage. The input common mode voltage range is from 0 to (VS – 1.5V). Output Stage The SM73403 has an open collector grounded-emitter NPN output transistor for the output stage. This requires an external pull-up resistor connected between the positive supply voltage and the output. The external pull-up resistor should be high enough resistance so to avoid excessive power dissipation. In addition, the pull-up resistor should be low enough resistance to enable the comparator to switch with the load circuitry connected. Because it is an open collector output stage, several comparator outputs can be connected together to create an OR’ing function output. With an open collector, the output can be used as a simple SPST switch to ground.The amount of current which the output can sink is approximately 10mA. When the maximum current limit is reached, the output transistor will saturate and the output will rise rapidly (Figure 4). 30159707 FIGURE 4. Output Saturation Voltage vs. Output Sink Current 5 www.national.com SM73403 SOT23-5 Tape and Reel Specification TAPE FORMAT Tape Section # Cavities Cavity Status Cover Tape Status Leader (Start End) 0 (min) Empty Sealed 75 (min) Empty Sealed 3000 Filled Sealed 1000 Filled Sealed 125 (min) Empty Sealed 0 (min) Empty Sealed Carrier Trailer (Hub End) TAPE DIMENSIONS 30159715 8mm 0.130 (3.3) 0.124 (3.15) 0.130 (3.3) 0.126 (3.2) 0.138 ± 0.002 (3.5 ± 0.05) 0.055 ± 0.004 (1.4 ± 0.11) 0.157 (4) 0.315 ± 0.012 (8 ± 0.3) Tape Size DIM A DIM Ao DIM B DIM Bo DIM F DIM Ko DIM P1 DIM W www.national.com 6 SM73403 REEL DIMENSIONS 30159716 8mm 7.00 330.00 0.059 1.50 0.512 13.00 0.795 20.20 2.165 55.00 0.331 + 0.059/−0.000 8.40 + 1.50/−0.00 0.567 14.40 W1 + 0.078/−0.039 W1 + 2.00/−1.00 Tape Size A B C D N W1 W2 W3 7 www.national.com SM73403 Physical Dimensions inches (millimeters) unless otherwise noted 5-Pin SOT23 NS Package Number MF05A www.national.com 8 SM73403 Notes 9 www.national.com SM73403 Single General Purpose Voltage Comparator 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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