LP265 LP365 Micropower Programmable Quad Comparator

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LP265 LP365 Micropower Programmable Quad Comparator General Description The LP365 consists of four independent voltage comparators The comparators can be programmed four at the same time for various

power supplies or from a single power supply over a wide range of voltages The input can sense signals at ground level even with single supply operation The unique output NPN transistor stages are

battery power circuits threshold detectors zero crossing detectors simple serial A D converters CO multivibrators voltage converters power sequencers and high performance F converters and RTD

range or dual supplies (4 DC to 36 DC or g2 0 DC to g18 DC ) Y Low supply current drain (10 ma) and low power consumption (10 mw comparator) I SET e 0 5 ma CC e 5 DC Y Uncommitted output stage

1 LP265 LP365 Micropower Programmable Quad Comparator General Description The LP365 consists of four independent voltage comparators The comparators can be programmed four at the same time for various supply currents input currents response times and output current drives This is accomplished by connecting a single resistor between the CC and I SET pins These comparators can be operated from split power supplies or from a single power supply over a wide range of voltages The input can sense signals at ground level even with single supply operation The unique output NPN transistor stages are uncommitted to either power supply They can be connected directly to various logic system supplies so that they are highly flexible to interface with various logic families Application areas include battery power circuits threshold detectors zero crossing detectors simple serial A D converters CO multivibrators voltage converters power sequencers and high performance F converters and RTD linearization Typical Connection Features December 1994 Y Single programming resistor to tailor power consumption input current speed and output current drive capability Y Wide single supply voltage range or dual supplies (4 DC to 36 DC or g2 0 DC to g18 DC ) Y Low supply current drain (10 ma) and low power consumption (10 mw comparator) I SET e 0 5 ma CC e 5 DC Y Uncommitted output stage selectable output levels Y Output directly compatible with DTL TTL CMOS MOS or other special logic families Y Input common-mode range includes ground Y Differential input voltage equal to the power supply voltage Connection Diagram Dual-In-Line Package LP265 LP365 Micropower Programmable Quad Comparator Programming Equation TL H I SET e (a )b( b )b1 3 R SET I SUPPLY 22cI SET TL H Order Number LP365M LP365AN or LP365N See NS Package Numbers M16A or N16A

2 Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply oltage 36 DC or g 18 DC Differential Input oltage g 36 DC Input oltage (Note 1) b0 3 to a36 DC Output Short Circuit to E (Note 2) Continuous OUT with Respect to E E b7s OUT s E a36 ESD Tolerance (Note 10) 2000 M Package N Package Power Dissipation (Note 3) 500 mw 500 mw T j Max 115 C 115 C i ja 115 C W 90 C W Lead Temp (Soldering 10 sec ) 260 C (apor Phase 60 sec ) 215 C (Infrared 15 sec ) 220 C Operating Temp Range LP365 0 C s T A s a70 C Storage Temp Range b40 C s T A s a150 C Electrical Characteristics (Note 4) Low power S e5 I SET e10 ma LP365A LP365 Tested Design Tested Design Units Symbol Parameter Conditions Typ Limit Limit Typ Limit Limit (Limit) (Note 5) (Note 6) (Note 5) (Note 6) OS Input Offset CM eo m oltage R S e100 (Max) I OS Input Offset CM e na Current LP (Max) I B Input Bias CM e na Current LP (Max) A OL Large Signal R L e100k oltage Gain CM Input Common- Mode oltage Range CMRR Common-Mode 0s CM s3 Rejection Ratio m (Max) PSRR Supply oltage g2 5s S 65 db Rejection Ratio sg3 5 I S Supply Current All Inputse0 R L e% OH Output oltage C e5 High E e R L e100k OL Output oltage E e0 Low db ma (Max) (Max) I SINK Output Sink E e0 ma Current O e0 4 I LEAK Output Leakage C e5 na Current E e0 (Max) t R Response Time CC e5 E e0 R L e5k 4 4 ms C L e10 pf (Note 7) 2

3 Electrical Characteristics (Continued) (Note 8) High power S e g15 I SET e100 ma LP365A LP365 Symbol Parameter Conditions Tested Design Tested Design Units Typ Limit Limit Typ Limit Limit (Limit) (Note 5) (Note 6) (Note 5) (Note 6) OS Input Offset CM e0 m oltage R S e100 (Max) I OS Input Offset CM e na Current LP (Max) I B Input Bias CM e na Current LP (Max) A OL Large Signal R L e15k oltage Gain CM Input Common- Mode oltage Range b15 b15 b15 b m (Max) CMRR Common-Mode b15s CM db Rejection Ratio s13 PSRR Supply oltage g10s S db Rejection Ratio sg15 I S Supply Current All Inputse ma R L e% LP (Max) OH Output oltage C e5 High E e R L e100k OL Output oltage E e0 Low (Max) I SINK Output Sink E e0 ma Current O e0 4 I LEAK Output Leakage C e15 na Current E eb15 (Max) t R Response Time CC e5 E e0 R L e5k ms C L e10 pf (Note 7) Note 1 The input voltage is not allowed to go 0 3 above a or b0 3 below b as this will turn on a parasitic transistor causing large currents to flow through the device Note 2 Short circuits from the output to a may cause excessive heating and eventual destruction The current in the output leads and the E lead should not be allowed to exceed 30 ma The output should not be shorted to b if E s( b ) a 7 Note 3 For operating at elevated temperatures these devices must be derated based on a thermal resistance of i ja and T j max T j et A ai ja P D Note 4 Boldface numbers apply at temperature extremes All other numbers apply at T A et j e25 C a e5 b e0 I SET e10 ma R L e100k and C e5 as shown in the Typical Connection diagram Note 5 Guaranteed and 100% production tested Note 6 Guaranteed (but not 100% production tested) over the operating temperature and supply voltage ranges These limits are not used to calculate out-going quality levels Note 7 The response time specified is for a 100 m input step with 5 m overdrive Note 8 Boldface numbers apply at temperature extremes All other numbers apply at T A et j e25 C a ea15 b eb15 I SET e100 ma R L e100k and C e5 as shown in the Typical Connection diagram Note 9 See AN-450 Surface Mounting Methods and Their Effect on Product Reliability for other methods of soldering surface mount devices Note 10 Human body model 1 5 kx in series with 100 pf 3

4 Typical Performance Characteristics Supply Current vs I SET Supply Current vs Supply oltage Supply Current vs Temperature Input Bias Current vs I SET Output Saturation oltage oltage Gain vs I SET Response Time Negative Transition Response Time Positive Transition Response Time Negative Transition Response Time Positive Transition TL H

5 Typical Applications Gated 4-Phase Oscillator oting Comparator TL H TL H fe20 khz 1 fe 1 6 R t C t All four phases run when X is low When X is high oscillation stops and power drain is zero If E e 0 25 then OUT will be low if 1 of the 3 other outputs are low Choice of E e 0 50 causes OUT to be low if 2 of the 3 other outputs are low E e 0 75 will cause OUT to be low if all 3 other outputs are low 5

6 Typical Applications (Continued) Ordinary Hysteresis Hysteresis from Emitter TL H It is a good practice to add a few millivolts of positive feedback to prevent oscillation when the input voltage is near the threshold Bar-Graph Display TL H Positive feedback from the emitter can also prevent oscillations when IN is near the threshold Level-Sensitive Strobe The positive feedback from pin 16 provides hysteresis TL H TL H Comparators B C and D do not respond until activated by the signal applied to comparator A 6

7 Typical Applications (Continued) Slow Op Amp (Inverter) Slow Op Amp (Unity-Gain Follower) TL H R B e a 20 ma Unlike most comparators the LP365 can be used as an op amp if suitable R-C damping networks are used Chopping Outputs TL H R B e a 20 ma The LP365 can also be used as a high-input-impedance follower-amplifier with the damping components shown Low Battery Detector TL H TL H Chopping the outputs by modulating the I SET current allows data to be transmitted via opto-couplers transformers etc I S 6 e 45 ma I S 3 8 e 1 ma f e 3 khz Comparator A detects when the supply voltage drops to 4 and enables comparator B to drive a piezoelectric alarm 7

8 Simplified Schematic TL H Current sources are programmed by I SET E is common to all 4 comparators 8

9 Physical Dimensions inches (millimeters) Plastic Surface-Mount Package (M) Order Number LP365M NS Package Number M16A 9

10 LP265 LP365 Micropower Programmable Quad Comparator Physical Dimensions inches (millimeters) (Continued) Molded Dual-In-Line Package (N) Order Number LP365AN or LP365N NS Package Number N16A

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