LM2903EP Low Power Low Offset Voltage Dual Comparators General Description Advantages The LM2903EP consists of two independent precision voltage comparators with an offset voltage specification as low as 2.0 mV max for two comparators which were designed specifically to operate from a single power supply over a wide range of voltages. Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage. This comparator also has a unique characteristic in that the input common-mode voltage range includes ground, even though operated from a single power supply voltage. Application areas include limit comparators, simple analog to digital converters; pulse, squarewave and time delay generators; wide range VCO; MOS clock timers; multivibrators and high voltage digital logic gates. The LM2903EP was designed to directly interface with TTL and CMOS. When operated from both plus and minus power supplies, the LM2903EP will directly interface with MOS logic where their low power drain is a distinct advantage over standard comparators. ENHANCED PLASTIC * Extended Temperature Performance of -40C to +85C * Baseline Control - Single Fab & Assembly Site * Process Change Notification (PCN) * Qualification & Reliability Data n n n n n n * Solder (PbSn) Lead Finish is standard * Enhanced Diminishing Manufacturing Sources (DMS) Support High precision comparators Reduced VOS drift over temperature Eliminates need for dual supplies Allows sensing near ground Compatible with all forms of logic Power drain suitable for battery operation Features n Wide supply -- Voltage range: 2.0V to 36V 1.0V to 18V -- Single or dual supplies: n Very low supply current drain (0.4 mA) -- independent of supply voltage n Low input biasing current: 25 nA 5 nA n Low input offset current: 3 mV n Maximum offset voltage: n Input common-mode voltage range includes ground n Differential input voltage range equal to the power supply voltage n Low output saturation voltage,: 250 mV at 4 mA n Output voltage compatible with TTL, DTL, ECL, MOS and CMOS logic systems Applications n Selected Military Applications n Selected Avionics Applications Ordering Information PART NUMBER VID PART NUMBER NS PACKAGE NUMBER (Note 3) LM2903MEP V62/04745-01 M08A (Notes 1, 2) TBD TBD Note 1: For the following (Enhanced Plastic) version, check for availability: - LM2903MXEP, LM2903NEP, LM2903ITLEP, LM2903ITLXEP. Parts listed with an "X" are provided in Tape & Reel and parts without an "X" are in Rails. Note 2: FOR ADDITIONAL ORDERING AND PRODUCT INFORMATION, PLEASE VISIT THE ENHANCED PLASTIC WEB SITE AT: www.national.com/ mil Note 3: Refer to package details under Physical Dimensions (c) 2005 National Semiconductor Corporation DS201141 www.national.com LM2903EP Low Power Low Offset Voltage Dual Comparators March 2005 LM2903EP Schematic and Connection Diagrams Dual-In-Line/SOIC Package 20114101 20114102 micro SMD 20114145 Top View www.national.com 2 If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage, V+ 36V Storage Temperature Range Differential Input Voltage (Note 12) 36V Soldering Information Input Voltage Dual-In-Line Package -0.3V to +36V Input Current (VIN < -0.3V) (Note 7) -65C to +150C Soldering (10 seconds) 50 mA 260C Small Outline Package Power Dissipation (Note 4) Molded DIP 780 mW Small Outline Package 510 mW 215C Vapor Phase (60 seconds) Infrared (15 seconds) 220C ESD rating Output Short-Circuit to Ground (Note 6) (1.5 k in series with 100 pF) Continuous Operating Temperature Range 1300V -40C to +85C Electrical Characteristics (Note 5) (V+=5V, TA = 25C, unless otherwise stated) Parameter Conditions LM2903 Min Units Typ Max Input Offset Voltage (Note 13) 2.0 7.0 mV Input Bias Current IIN(+) or IIN(-) with Output In 25 250 nA Linear Range, VCM = 0V (Note 9) Input Offset Current IIN(+)-IIN(-) VCM = 0V Input Common Mode V+ = 30V (Note 10) 5.0 50 nA V+-1.5 V 0.4 1.0 mA 1 2.5 0 Voltage Range Supply Current RL= V+=5V + V =36V Voltage Gain RL15 k, V+=15V 25 mA 100 V/mV 300 ns VO = 1V to 11V Large Signal Response VIN=TTL Logic Swing, VREF=1.4V Time VRL=5V, RL=5.1 k Response Time VRL=5V, RL=5.1 k (Note 11) Output Sink Current VIN(-)=1V, VIN(+)=0, VO1.5V 6.0 1.5 s 16 mA Saturation Voltage VIN(-)=1V, VIN(+)=0, ISINK4 mA 250 Output Leakage Current VIN(-)=0, VIN(+)=1V, VO=5V 0.1 400 mV nA Electrical Characteristics (Notes 4, 5) (V+ = 5V) Parameter Conditions LM2903 Min Typ Units Max Input Offset Voltage (Note 13) 9 15 mV Input Offset Current IIN(+)-IIN(-), VCM=0V 50 200 nA Input Bias Current IIN(+) or IIN(-) with Output in Linear Range, VCM=0V (Note 9) 200 500 nA Input Common Mode Voltage Range V+=30V (Note 10) V+-2.0 V Saturation Voltage VIN(-)=1V, VIN(+)=0, ISINK4 mA 700 mV 0 400 Output Leakage Current VIN(-)=0, VIN(+)=1V, VO=30V 1.0 A Differential Input Voltage Keep All VIN's0V (or V-, if Used), (Note 12) 36 V 3 www.national.com LM2903EP Absolute Maximum Ratings (Note 14) LM2903EP Electrical Characteristics (Notes 4, 5) (Continued) Note 4: For operating at high temperatures, the LM2903EP must be derated based on a 125C maximum junction temperature and a thermal resistance of 170C/W which applies for the device soldered in a printed circuit board, operating in a still air ambient. The low bias dissipation and the "ON-OFF" characteristic of the outputs keeps the chip dissipation very small (PD100 mW), provided that the output transistors are allowed to saturate. Note 5: "Testing and other quality control techniques are used to the extent deemed necessary to ensure product performance over the specified temperature range. Product may not necessarily be tested across the full temperature range and all parameters may not necessarily be tested. In the absence of specific PARAMETRIC testing, product performance is assured by characterization and/or design." Note 6: Short circuits from the output to V+ can cause excessive heating and eventual destruction. When considering short circuits to ground, the maximum output current is approximately 20 mA independent of the magnitude of V+. Note 7: This input current will only exist when the voltage at any of the input leads is driven negative. It is due to the collector-base junction of the input PNP transistors becoming forward biased and thereby acting as input diode clamps. In addition to this diode action, there is also lateral NPN parasitic transistor action on the IC chip. This transistor action can cause the output voltages of the comparators to go to the V+ voltage level (or to ground for a large overdrive) for the time duration that an input is driven negative. This is not destructive and normal output states will re-establish when the input voltage, which was negative, again returns to a value greater than -0.3V. Note 8: These specifications are limited to -40CTA+85C. Note 9: The direction of the input current is out of the IC due to the PNP input stage. This current is essentially constant, independent of the state of the output so no loading change exists on the reference or input lines. Note 10: The input common-mode voltage or either input signal voltage should not be allowed to go negative by more than 0.3V. The upper end of the common-mode voltage range is V+-1.5V at 25C, but either or both inputs can go to 36V without damage, independent of the magnitude of V+. Note 11: The response time specified is for a 100 mV input step with 5 mV overdrive. For larger overdrive signals 300 ns can be obtained, see typical performance characteristics section. Note 12: Positive excursions of input voltage may exceed the power supply level. As long as the other voltage remains within the common-mode range, the comparator will provide a proper output state. The low input voltage state must not be less than -0.3V (or 0.3V below the magnitude of the negative power supply, if used). Note 13: At output switch point, VO.1.4V, RS=0 with V+ from 5V to 30V; and over the full input common-mode range (0V to V+-1.5V), at 25C. Note 14: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Note 15: The LM193 within this data sheet's graphics is referenced because of it's a similarity to the LM2903, however is not offered in this data sheet. www.national.com 4 LM2903EP Typical Performance Characteristics Supply Current Input Current 20114131 20114130 Response Time for Various Input Overdrives -- Negative Transition Output Saturation Voltage 20114133 20114132 Response Time for Various Input Overdrives -- Positive Transition 20114134 5 www.national.com LM2903EP Application Hints The differential input voltage may be larger than V+ without damaging the device (Note 12). Protection should be provided to prevent the input voltages from going negative more than -0.3 VDC (at 25C). An input clamp diode can be used as shown in the applications section. The LM2903EP is a high gain, wide bandwidth device which, like most comparators, can easily oscillate if the output lead is inadvertently allowed to capacitively couple to the inputs via stray capacitance. This shows up only during the output voltage transition intervals as the comparator change states. Power supply bypassing is not required to solve this problem. Standard PC board layout is helpful as it reduces stray input-output coupling. Reducing the input resistors to < 10 k reduces the feedback signal levels and finally, adding even a small amount (1.0 to 10 mV) of positive feedback (hysteresis) causes such a rapid transition that oscillations due to stray feedback are not possible. Simply socketing the IC and attaching resistors to the pins will cause input-output oscillations during the small transition intervals unless hysteresis is used. If the input signal is a pulse waveform, with relatively fast rise and fall times, hysteresis is not required. All input pins of any unused comparators should be tied to the negative supply. The output of the LM2903EP is the uncommitted collector of a grounded-emitter NPN output transistor. Many collectors can be tied together to provide an output OR'ing function. An output pull-up resistor can be connected to any available power supply voltage within the permitted supply voltage range and there is no restriction on this voltage due to the magnitude of the voltage which is applied to the V+ terminal of the LM2903EP package. The output can also be used as a simple SPST switch to ground (when a pull-up resistor is not used). The amount of current which the output device can sink is limited by the drive available (which is independent of V+) and the of this device. When the maximum current limit is reached (approximately 16mA), the output transistor will come out of saturation and the output voltage will rise very rapidly. The output saturation voltage is limited by the approximately 60 rSAT of the output transistor. The low offset voltage of the output transistor (1.0mV) allows the output to clamp essentially to ground level for small load currents. The bias network of the LM2903EP establishes a drain current which is independent of the magnitude of the power supply voltage over the range of from 2.0 VDC to 30 VDC. It is usually unnecessary to use a bypass capacitor across the power supply line. Typical Applications (V+=5.0 VDC) (Note 15) Basic Comparator Driving CMOS Driving TTL 20114135 20114136 Squarewave Oscillator Pulse Generator 20114137 Crystal Controlled Oscillator 20114138 20114140 20114139 * For large ratios of R1/R2, D1 can be omitted. www.national.com 6 LM2903EP Typical Applications (V+=5.0 VDC) (Note 15) (Continued) Two-Decade High Frequency VCO 20114141 V* = +30 VDC +250 mVDC VC +50 VDC 700Hz fo 100kHz Basic Comparator Non-Inverting Comparator with Hysteresis 20114106 20114109 Inverting Comparator with Hysteresis Output Strobing 20114110 20114111 7 www.national.com LM2903EP Typical Applications (V+=5.0 VDC) (Note 15) (Continued) AND Gate OR Gate 20114113 20114112 Large Fan-in AND Gate Limit Comparator 20114115 20114114 Comparing Input Voltages of Opposite Polarity ORing the Outputs 20114116 20114117 www.national.com 8 LM2903EP Typical Applications (V+=5.0 VDC) (Note 15) (Continued) Zero Crossing Detector (Single Power Supply) One-Shot Multivibrator 20114121 20114122 Bi-Stable Multivibrator One-Shot Multivibrator with Input Lock Out 20114124 20114123 Zero Crossing Detector Comparator With a Negative Reference 20114144 20114143 9 www.national.com LM2903EP Typical Applications (V+=5.0 VDC) (Note 15) (Continued) Time Delay Generator 20114107 Split-Supply Applications (V+=+15 VDC and V-=-15 VDC) MOS Clock Driver 20114142 www.national.com 10 LM2903EP Physical Dimensions inches (millimeters) unless otherwise noted SOIC Package NS Package Number M08A Molded Dual-In-Line Package (N) NS Package N08E 11 www.national.com LM2903EP Low Power Low Offset Voltage Dual Comparators Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 8-Bump (12 mil) micro SMD Package NS Package TLA08AAA X1 = 1,514mm X2 = 1.514mm X3 = 0.600mm 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. 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