LP311N

LP311 Voltage Comparator February 1995 LP311 Voltage Comparator General Description The LP311 is a low power version of the industry-standard LM311 It takes advantage of stable high-value ion-implanted resistors to perform the same function as an LM311 with a 30 1 reduction in power drain but only a 6 1 slowdown of response time Thus the LP311 is well suited for batterypowered applications and all other applications where fast response is not needed It operates over a wide range of supply voltages from 36V down to a single 3V supply with less than 200 mA drain but it is still capable of driving a 25 mA load The LP311 is quite easy to apply without any oscillation if ordinary precautions are taken to minimize stray coupling from the output to either input or to the balance pins (as described in the LM311 datasheet Application Hints) Features Y Y Y Y Y Y Y Y Low power drain 900 mW on 5V supply Operates from g 15V or a single supply as low as 3V Output can drive 25 mA Emitter output can swing below negative supply Response time 1 2 ms Same pin-out as LM311 Low input currents 2 nA of offset 15 nA of bias Large common-mode input range b14 6V to 13 6V with g 15V supply Applications Y Y Y Level-detector for battery-powered instruments Low-power lamp or relay driver Low-power zero-crossing detector Schematic Diagram TL H 5711 – 7 Connection Diagram Dual-In-Line Package Order Number LP311M or LP311N See NS Package Numbers M08A or N08E TL H 5711 – 4 Top View C1995 National Semiconductor Corporation TL H 5711 RRD-B30M115 Printed in U S A Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Total Supply Voltage (V8 – 4) Collector Output to Negative Supply Voltage (V7 – 4) Collector Output to Emitter Output Emitter Output to Negative Supply Voltage (V1 – 4) Differential Input Voltage Input Voltage (Note 1) 36V 40V 40V g 30V g 30V g 15V Power Dissipation (Note 2) Output Short Circuit Duration Operating Temperature Range 500 mW 10 sec 0 C to 70 C b 65 C to 150 C Storage Temperature Range Lead Temperature (Soldering 10 seconds) 260 C Electrical Characteristics These specifications apply for VS e g 15V and 0 C s TA s 70 C unless otherwise specified Parameter Input Offset Voltage (Notes 3 4) Input Offset Current (Notes 3 4) Input Bias Current (Note 3) Voltage Gain Response Time (Note 5) Saturation Voltage (Note 6) Strobe Current (Note 7) Output Leakage Current Input Offset Voltage (Notes 3 4) Input Offset Current (Notes 3 4) Input Bias Current (Note 3) Input Voltage Range Saturation Voltage (Note 6) Positive Supply Current Negative Supply Current Minimum Operating Voltage V a t4 5V Vb e 0V VINs b10 mV ISINKs1 6 mA TA e 25 C Output on TA e 25 C TA e 25 C Vb a 0 5 a 13 7 b 14 7 Conditions TA e 25 C RSs100k TA e 25 C TA e 25 C TA e 25 C RL e 5k TA e 25 C VINs b10 mV IOUT e 25 mA TA e 25 C TA e 25 C VINt10 mV VOUT e 35V TA e 25 C RSs100k Min Typ 20 20 15 Max 75 25 100 Units mV nA nA V mV ms 40 200 12 04 15 300 100 10 35 150 V a b1 5 04 300 180 35 V mA nA mV nA nA V V mA mA V 100 200 02 01 150 80 30 Note 1 This rating applies for g 15V supplies The positive input voltage limit is 30V above the negative supply The negative input voltage limit is equal to the negative supply voltage or 30V below the positive supply whichever is less Note 2 The maximum junction temperature of the LP311 is 85 C For operating at elevated temperatures devices in the dual-in-line package must be derated based on a thermal resistance of 160 C W junction to ambient Note 3 The offset voltage offset current and bias current specifications apply for any supply voltage from a single 4V supply up to g 15V supplies Note 4 The offset voltages and offset currents given are the maximum values required to drive the output within a volt of either supply with 1 mA load Thus these parameters define an error band and take into account the worst-case effects of voltage gain and input impedance Note 5 The response time specified is for a 100 mV input step with 5 mV overdrive Note 6 Saturation voltage specification applies to collector-emitter voltage (V7-1) for VCOLLECTOR s (V a b 3V) Note 7 This specification gives the range of current which must be drawn from the strobe pin to ensure the output is properly disabled Do not short the strobe pin to ground It should be current driven 100 mA to 300 mA 2 Typical Performance Characteristics Input Characteristics Input Bias Current Input Offset Current Common Mode Limits Transfer Function Output Saturation Voltage (Collector Output) Response Time for Various Input Overdrives Response Time for Various Input Overdrives Output Saturation Voltage (Emitter Output) Response Time for Various Input Overdrives Response Time for Various Input Overdrives Output Limiting Characteristics TL H 5711 – 5 3 Typical Performance Characteristics Supply Current (Continued) Leakage Currents Supply Current TL H 5711 – 6 Applications Information For applications information and typical applications refer to the LM311 datasheet Auxiliary Circuits Strobing Offset Balancing TL H 5711 – 2 TL H 5711– 1 Note Do not ground strobe pin Test Circuits Test Circuit 1 (Collector Output) Test Circuit 2 (Emitter Output) TL H 5711 – 8 TL H 5711 – 9 Test Circuit 3 (Collector Output) Test Circuit 4 (Emitter Output) TL H 5711 – 10 TL H 5711 – 11 4 Physical Dimensions inches (millimeters) Order Number LP311M NS Package Number M08A 5 LP311 Voltage Comparator Physical Dimensions inches (millimeters) (Continued) Molded Dual-In-Line Package (N) Order Number LP311N NS Package Number N08E 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 OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or systems which (a) are intended for surgical implant 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81-043-299-2309 Fax 81-043-299-2408 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