LP311 Voltage Comparator General Description Features 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). 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. LP311 Voltage Comparator February 1995 Absolute Maximum Ratings Power Dissipation (Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Total Supply Voltage (V8 – 4) 10 sec Operating Temperature Range 36V 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) 500 mW Output Short Circuit Duration 0§ C to 70§ C b 65§ C to 150§ C Storage Temperature Range Lead Temperature (Soldering, 10 seconds) 260§ C 40V 40V g 30V g 30V g 15V Electrical Characteristics These specifications apply for VS e g 15V and 0§ C s TA s 70§ C, unless otherwise specified. Parameter Typ Max Units Input Offset Voltage (Notes 3, 4) TA e 25§ C, RSs100k Conditions Min 2.0 7.5 mV Input Offset Current (Notes 3, 4) TA e 25§ C 2.0 25 nA Input Bias Current (Note 3) TA e 25§ C 15 100 Voltage Gain TA e 25§ C, RL e 5k Response Time (Note 5) Saturation Voltage (Note 6) 40 nA 200 V/mV TA e 25§ C 1.2 ms VINs b10 mV, IOUT e 25 mA 0.4 1.5 V 200 300 mA 0.2 100 nA 10 mV 35 nA 150 nA TA e 25§ C Strobe Current (Note 7) TA e 25§ C Output Leakage Current VINt10 mV, VOUT e 35V 100 TA e 25§ C Input Offset Voltage (Notes 3, 4) RSs100k Input Offset Current (Notes 3, 4) Input Bias Current (Note 3) Input Voltage Range Vb a 0.5 a 13.7, b 14.7 V a b1.5 V 0.4 V Saturation Voltage (Note 6) V a t4.5V, Vb e 0V VINs b10 mV, ISINKs1.6 mA 0.1 Positive Supply Current TA e 25§ C, Output on 150 300 mA Negative Supply Current TA e 25§ C 80 180 mA Minimum Operating Voltage TA e 25§ C 3.0 3.5 V 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) Supply Current Leakage Currents 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. 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