LMC7221

LMC7221 NSC | Alldatasheet

Document overview

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Technical content

Features

n Tiny SOT 23-5 package saves space n Package is less than 1.43 mm thick n Guaranteed specs at 2.7V, 5V, 15V supplies n Typical supply current 7 µA at 5V n Response time of 4 µs at 5V n LMC7221 — open drain output n Input common-mode range beyond V− and V+ n Low input current

Applications

n Mixed voltage battery powered products n Notebooks and PDAs n PCMCIA cards n Mobile communications n Alarm and security circuits n Driving low current LEDs n Direct sensor interface Connection Diagrams

Ordering Information

Package Ordering NSC Drawing Package Transport Media Information Number Marking 8-Pin SO-8 LMC7221AIM M08A LMC7221AIM Rails LMC7221AIMX M08A LMC7221AIM 2.5k Units Tape and Reel LMC7221BIM M08A LMC7221BIM Rails LMC7221BIMX M08A LMC7221BIM 2.5k Units Tape and Reel 5-Pin SOT 23-5 LMC7221AIM5 MA05A C01A 1k Units Tape and Reel LMC7221AIM5X MA05A C01A 3k Units Tape and Reel LMC7221BIM5 MA05A C01B 1k Units Tape and Reel LMC7221BIM5X MA05A C01B 3k Units Tape and Reel 8–Pin SO-8 DS012346-1 Top View 5-Pin SOT23-5 DS012346-2 Top View September 1999 LMC7221 Tiny CMOS Comparator with Rail-To-Rail Input and Open Drain Output © 1999 National Semiconductor Corporation DS012346 www.national.com

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) 2 kV Differential Input Voltage (V CC ) +0.3V to (−VCC )−0.3V Voltage at Input (V CC ) + 0.3V to (−VCC )−0.3V Voltage at Output Pin 15V Supply Voltage (V +–V −) 16V Current at Input Pin (Note 7) ±5m A Current at Output Pin (Notes 3, 8) ±30 mA Current at Power Supply Pin 40 mA Lead Temperature (soldering, 10 sec.) 260˚C Storage Temperature Range −65˚C to +150˚C Junction Temperature (Note 4) 150˚C Operating Ratings(Note 1) Supply Voltage 2.7 ≤ VCC ≤ 15V Junction Temperature Range LMC7221AI, LMC7221BI −40˚C ≤ TJ ≤ +85˚C Thermal Resistance (θJA) 8-Pin Surface Mount 180˚C/W 5-Pin Surface Mount 325˚C/W 2.7V Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.7V, V− = 0V, VCM = VO = V+/2.Boldfacelimits apply at the temperature extremes Typ LMC7221AI LMC7221BI Symbol Parameter Conditions (Note 5) Limit Limit Units (Note 6) (Note 6) VOS Input Offset Voltage 3 5 15 mV 81 8 max TCV OS Input Offset Voltage 1.0 µV/˚C Temperature Drift Input Offset Voltage (Note 10) 3.3 µV/Month Average Drift I B Input Current 0.04 pA IOS Input Offset Current 0.02 pA CMRR Common Mode 0V ≤ VCM ≤ 2.7V 75 dB Rejection Ratio PSRR Power Supply 2.7V ≤ V+ ≤ 15V 80 dB Rejection Ratio AV Voltage Gain 100 dB CMVR Input Common-Mode CMRR > 55 dB 3.0 2.9 2.9 V Voltage Range 2.7 2.7 min CMRR > 55 dB −0.3 −0.2 −0.2 V 0.0 0.0 max VOL Output Voltage Low I load = 2.5 mA 0.2 0.3 0.3 V 0.4 0.4 max IS Supply Current V OUT = low 7 12 12 µA 14 14 max www.national.com 2

5.0V and 15.0V Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5.0V and 15V, V− = 0V, VCM = VO = V+/2.Boldfacelim- its apply at the temperature extremes Typ LMC7221AI LMC7221BI Symbol Parameter Conditions (Note 5) Limit Limit Units (Note 6) (Note 6) VOS Input Offset Voltage 3 5 15 mV 81 8 max TCV OS Input Offset Voltage V + = 5V 1.0 µV/˚C Temperature Drift V + = 15V 4.0 Input Offset Voltage V + = 5V (Note 10) 3.3 µV/Month Average Drift V + = 15V (Note 10) 4.0 IB Input Current 0.04 pA IOS Input Offset Current 0.02 pA CMRR Common Mode V+ = 5.0V 75 dB Rejection Ration V+ = 15.0V 82 dB PSRR Power Supply 5V ≤ V+ ≤ 10V 80 dB Rejection Ratio AV Voltage Gain 100 dB CMVR Input Common-Mode V+ = 5.0V 5.3 5.2 5.2 V Voltage Range CMRR > 55 dB 5.0 5.0 min CMRR > 55 dB 0.0 0.0 max V+ = 15.0V 15.3 15.2 15.2 V CMRR > 55 dB 15.0 15.0 min CMRR > 55 dB 0.0 0.0 max VOL Output Voltage Low V+ = 5V 0.2 0.40 0.40 mV Iload = 5m A 0.55 0.55 max V+ = 15V 0.2 0.40 0.40 mV Iload = 5m A 0.55 0.55 max IS Supply Current V OUT = Low 7 14 14 µA 18 18 max ISC Short Circuit Current Sinking (Note 8) 45 mA Leakage Characteristics TJ = 25˚C Typ LMC7221AI LMC7221BI Symbol Parameter Conditions (Note 5) Limit Limit Units (Note 6) (Note 6) ILEAKAGE Output Leakage V+ = 2.7V Current V IN(+)= 0.5V 0.1 500 500 nA VIN(−)= 0V VOUT = 15V www.national.com3

Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VCM = VO = V+/2.Boldfacelimits apply at the temperature extreme Typ LMC7221AI LMC7221BI Symbol Parameter Conditions (Note 5) Limit Limit Units (Note 6) (Note 6) trise Rise Time f = 10 kHz, CL = 50 pF, (Note 9) 0.3 µs Overdrive= 10 mV, 5 kΩ Pullup tfall Fall Time f = 10 kHz, CL = 50 pF, (Note 9) 0.3 µs Overdrive= 10 mV, 5 kΩ Pullup tPHL Propagation Delay f = 10 kHz, 10 mV 10 µs (High to Low) C L = 50 pF, 100 mV 4 (Note 11) 5 k Ω Pullup (Note 9) V+ = 2.7V, 10 mV 10 µs f= 10 kHz, C L = 50 pF, 100 mV 4 5k Ω Pullup (Note 9) tPLH Propagation Delay f = 10 kHz, 10 mV 6 µs (Low to High) C L = 50 pF, 100 mV 4 (Note 11) 5 k Ω Pullup (Note 9) V+ = 2.7V, 10 mV 7 µs f= 10 kHz, C L = 50 pF, 100 mV 4 5k Ω Pullup (Note 9) Note 1:Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in- tended 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, 1.5 kΩ in series with 100 pF. Note 3:Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the maximum allowed junction temperature of 150˚C. Output currents in excess of±30 mA may adversely affect reliability. Note 4:The maximum power dissipation is a function of TJ(max),θJA, and TA. The maximum allowable power dissipation at any ambient temperature is Note 5:PD = (TJ(max)−T A)/θJA. All numbers apply for packages soldered directly into a PC board. Note 6:Typical values represent the most likely parametric norm. Note 7:All limits are guaranteed by testing or statistical analysis. Note 8:Limiting input pin current is only necessary for input voltages which exceed the absolute maximum input voltage rating. Note 9:Do not short circuit the output to V+ when V+ is greater than 12V or reliability will be adversely affected. Note 10:C L includes the probe and test jig capacitance. Note 11:Input offset voltage average drift is calculated by dividing the accelerated operating life VOS drift by the equivalent operational time. This represents worst case input conditions and includes the first 30 days of drift. Note 12:Input step voltage for propagation delay measurement is 2V. www.national.com 4

Typical Performance Characteristics Supply Current vs Supply Voltage DS012346-3 Supply Current vs Temperature while Sinking DS012346-4 Output Sinking Current vs Supply Voltage DS012346-5 Output Sinking Current vs Output Voltage @ 5V DS012346-6 Output Sinking Current vs Output Voltage @ 15V DS012346-7 Response Time for Various Input Overdrives −t PHL DS012346-8 Response Time vs Various Input Overdrives −t PHL DS012346-9 Response Time vs Various Input Overdrives −t PHL DS012346-10 Input Bias Current vs Common Mode Voltage DS012346-11 www.national.com5

Typical Performance Characteristics(Continued)

Application Information

1.0 Benefits of the LMC7221 Tiny Comparator

Size.The small footprint of the SOT 23-5 packaged Tiny Comparator, (0.120 x 0.118 inches, 3.05 x 3.00 mm) saves space on printed circuit boards, and enable the design of smaller electronic products. Because they are easier to carry, many customers prefer smaller and lighter products. Height.The height (0.056 inches, 1.43 mm) of the Tiny Comparator makes it possible to use it in PCMCIA type III cards. Simplified Board Layout.The Tiny Comparator can sim- plify board layout in several ways. First, by placing a com- parator where comparators are needed, instead of routing signals to a dual or quad device, long pc traces may be avoided. By using multiple Tiny Comparators instead of duals or quads, complex signal routing and possibly crosstalk can be reduced. Low Supply Current.The typical 7 µA supply current of the LMC7221 extends battery life in portable applications, and may allow the reduction of the size of batteries in some ap- plications. Wide Voltage Range. The LMC7221 is characterized at 15V, 5V and 2.7V. Performance data is provided at these popular voltages. This wide voltage range makes the LMC7221 a good choice for devices where the voltage may vary over the life of the batteries. Digital Outputs Representing Signal Level.Comparators provide a high or low digital output depending on the voltage levels of the (+) and (−) inputs. This makes comparators use- ful for interfacing analog signals to microprocessors and other digital circuits. The LMC7221 can be thought of as a one-bit a/d converter. Open Drain Output.The open drain output is like the open collector output of a logic gate. This makes the LMC7221 very useful for mixed voltage systems. Driving LEDs (Light Emitting Diodes).With a 5 volt power supply, the LMC7221’s output sinking current can drive small, high efficiency LEDs for indicator and test point cir- cuits. The small size of the Tiny package makes it easy to find space to add this feature to even compact designs. Input range to Beyond Rail to Rail.The input common mode range of the LMC7221 is slightly larger than the actual power supply range. This wide input range means that the comparator can be used to sense signals close to the power supply rails. This wide input range can make design easier by eliminating voltage dividers, amplifiers, and other front end circuits previously used to match signals to the limited input range of earlier comparators. This is useful to power supply monitoring circuits which need to sense their own power supply, and compare it to a reference voltage which is close to the power supply voltage. The wide input range can also be useful for sensing the voltage drop across a current sense resistor for battery chargers. Input Bias Current vs Common Mode Voltage DS012346-12 Input Bias Current vs Common Mode Voltage DS012346-13 Input Bias Current vs Temperature DS012346-14 Leakage Current vs Supply Voltage DS012346-15 www.national.com 6

put resistors as a zero crossing detector. the amplifier can save cost, space, and design time.

2.0 Low Voltage Operation

extends 200 mV (guaranteed) below the negative supply. 4 µs with overdrives of 100 mV.

3.0 Open Drain Output

4.0 Output Short Circuit Current

FIGURE 1. Even at Low-Supply Voltage of 2.7V, an

diodes to the supply rails, and varistors may be used.

5.0 Input Protection

when power is off, damage to the LMC7221 may occur. Figure 3. Note that diode leakage current may affect accuracy during normal operation.

6.0 Layout Considerations

trically noisy environments.

7.0 Push-Pull Outputs, Dual Versions

with push-pull outputs which can source current. with push-pull outputs, please see the LMC6762 datasheet.

8.0 Additional SOT23-5 Tiny Devices

rent specified at 2.7V, 3.0V, 3.3V, 5V and 10V. LM4040 Precision micropower shunt voltage reference.

9.0 Spice Macromodel

Application Information(Continued) Tape Size A B C D N W1 W2 W3 SOT-23-5 Tape and Reel Specification TAPE FORMAT Tape Section # Cavities Cavity Status Cover Tape Status Leader 0 (min) Empty Sealed (Start End) 75 (min) Empty Sealed Carrier 3000 Filled Sealed

1000 Filled Sealed

Trailer 125 (min) Empty Sealed (Hub End) 0 (min) Empty Sealed REEL DIMENSIONS DS012346-19 www.national.com9

SOT-23-5 Tape and Reel Specification(Continued) Tape Size DIM A DIM Ao DIM B DIM Bo DIM F DIM Ko DIM P1 DIM W Tape Dimensions DS012346-20 www.national.com 10

Physical Dimensionsinches (millimeters) unless otherwise noted 5-Pin SOT Package Order Number LMC7221AIM5, LMC7221AIM5X, LMC7221BIM5, or LMC7221BIMX 8-Pin Small Outline Package Order Number LMC7221AIM, LMC7221AIMX, LMC7221BIM, or LMC7221BIMX www.national.com11

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 AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 www.national.com LMC7221 Tiny CMOS Comparator with Rail-To-Rail Input and Open Drain Output 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.