LMC7211

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LMC7211 Tiny CMOS Comparator with Rail-to-Rail Input and Push-Pull Output Literature Number: SNOS746E

January 26, 2010 Tiny CMOS Comparator with Rail-to-Rail Input and Push- Pull Output General Description The LMC7211 is a micropower CMOS comparator available in the space saving SOT23-5 package. This makes the com- parator ideal for space and weight critical designs. The LMC7211 is supplied in two offset voltage grades, 5 mV and 15 mV. The main benefits of the Tiny package are most apparent in small portable electronic devices, such as mobile phones, pagers, notebook computers, personal digital assistants, and PCMCIA cards. The rail-to-rail input voltage makes the LMC7211 a good choice for sensor interfacing, such as light detector circuits, optical and magnetic sensors, and alarm and status circuits. The Tiny Comparator's outside dimensions (length x width x height) of 3.05mm x 3.00mm x 1.43mm allow it to fit into tight spaces on PC boards. See the LMC7221 for a comparator with an open-drain output.

Features

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

Applications

■ Battery Powered Products ■ Notebooks and PDAs ■ PCMCIA cards ■ Mobile Communications ■ Alarm and Security circuits ■ Direct Sensor Interface ■ Replaces amplifiers used as comparators with better performance and lower current Connection Diagrams 8-Pin SO-8 1233701 Top View 5-Pin SOT23-5 1233702 Top View © 2010 National Semiconductor Corporation 12337 www.national.com LMC7211 Tiny CMOS Comparator with Rail-to-Rail Input and Push-Pull Output

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 (VCC) +0.3V to (−VCC)−0.3V Voltage at Input/Output Pin (VCC) + 0.3V to (−VCC)−0.3V Supply Voltage (V+–V−) 16V Current at Input Pin (Note 7) ±5 mA Current at Output Pin (Note 3, Note 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 LMC7211AI, LMC7211BI −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. Boldface limits apply at the temperature extremes. Typ LMC7211AI LMC7211BI Symbol Parameter Conditions (Note 5) Limit Limit Units (Note 6) (Note 6) VOS Input Offset Voltage 3 5 15 mV 8 18 max TCVOS Input Offset Voltage 1.0 μV/°C Temperature Drift Input Offset Voltage (Note 10) 3.3 μV/Month Average Drift IB 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 VOH Output Voltage High Iload = 2.5 mA 2.5 2.4 2.4 V 2.3 2.3 min VOL Output Voltage Low Iload = 2.5 mA 0.2 0.3 0.3 V 0.4 0.4 max IS Supply Current VOUT = Low 7 12 12 μA 14 14 max www.national.com 2 LMC7211

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. Boldface limits apply at the temperature extremes. Typ LMC7211AI LMC7211BI Symbol Parameter Conditions (Note 5) Limit Limit Units (Note 6) (Note 6) VOS Input Offset Voltage 3 5 15 mV 8 18 max TCVOS Input Offset Voltage V+ = 5V 1.0 μV/°C Temperature Drift V+ = 15V 4.0 Input Offset Voltage V+ = 5V 3.3 μV/Month Average Drift V+ = 15V 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 VOH Output Voltage High V+ = 5V 4.8 4.6 4.6 mV Iload = 5 mA 4.45 4.45 min V+ = 15V 14.8 14.6 14.6 mV Iload = 5 mA 14.45 14.45 min VOL Output Voltage Low V+ = 5V 0.2 0.40 0.40 mV Iload = 5 mA 0.55 0.55 max V+ = 15V 0.2 0.40 0.40 mV Iload = 5 mA 0.55 0.55 max IS Supply Current VOUT = Low 7 14 14 μA 18 18 max ISC Short Circuit Current Sourcing 30 mA Sinking (Note 8) 45 mA 3 www.national.com LMC7211

Unless otherwise specified, all limits guaranteed for TJ = 25°C, V+ = 5V, V− = 0V, VCM = VO = V+/2. Boldface limits apply at the temperature extreme. Typ LMC7211AI LMC7211BI Symbol Parameter Conditions (Note 5) Limit Limit Units (Note 6) (Note 6) trise Rise Time f = 10 kHz, Cl = 50 pF, 0.3 μs Overdrive = 10 mV (Note 9) tfall Fall Time f = 10 kHz, Cl = 50 pF, 0.3 μs Overdrive = 10 mV (Note 9) tPHL Propagation Delay f = 10 kHz, 10 mV 10 μs (High to Low) Cl = 50 pF 100 mV 4 (Note 11) (Note 9) V+ = 2.7V, 10 mV 10 μs f = 10 kHz, 100 mV 4 Cl = 50 pF (Note 9) tPLH Propagation Delay f = 10 kHz, 10 mV 6 μs (Low to High) Cl = 50p 100 mV 4 (Note 11) (Note 9) V+ = 2.7V, 10 mV 7 μs f = 10 kHz, 100 mV 4 Cl = 50 pF (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 intended 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 over long term 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 PD = (TJ(max) − TA)/θJA.All numbers apply for packages soldered directly into a PC board. Note 5: Typical values represent the most likely parametric norm. Note 6: All limits are guaranteed by testing or statistical analysis. Note 7: Limiting input pin current is only necessary for input voltages that exceed absolute maximum input voltage rating. Note 8: Do not short circuit output to V+, when V+ is greater than 12V or reliability will be adversely affected. Note 9: CL includes the probe and jig capacitance. Note 10: 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 11: Input step voltage for propagation delay measurement is 2V.

Ordering Information

Package Ordering NSC Drawing Package Transport Media Information Number Marking 8-Pin SO-8 LMC7211AIM M08A LM7211AIM Rails LMC7211AIMX M08A LM7211AIM 2.5k Units Tape and Reel LMC7211BIM M08A LM7211BIM Rails LMC7211BIMX M08A LM7211BIM 2.5k Units tape and Reel 5-Pin SOT 23-5 LMC7211AIM5 MF05A C00A 1k Units Tape and Reel LMC7211AIM5X MF05A C00A 3k Units Tape and Reel LMC7211BIM5 MF05A C00B 1k Units Tape and Reel LMC7211BIM5X MF05A C00B 3k Units Tape and Reel www.national.com 4 LMC7211

Typical Performance Characteristics Single Supply TA = 25°C unless specified Supply Current vs. Supply Voltage 1233715 Supply Current vs. Temperature while Sourcing 1233716 Supply Current vs. Temperature while Sinking 1233717 Output Sourcing Current vs. Supply Voltage 1233718 Output Sinking Current vs. Supply Voltage 1233719 Output Sourcing Current vs. Output Voltage @ 5V 1233720 5 www.national.com LMC7211

Output Sinking Current vs. Output Voltage @ 5V 1233721 Output Sourcing Current vs. Output Voltage @ 15V 1233722 Output Sinking Current vs. Output Voltage @ 15V 1233723 Response Time for Various Input Overdrives −tPLH 1233724 Response Time for Various Input Overdrives −tPHL 1233725 Response Time for Various Input Overdrives −tPLH 1233726 www.national.com 6 LMC7211

Response Time for Various Input Overdrives −tPHL 1233727 Response Time for Various Input Overdrives −tPLH 1233728 Response Time for Various Input Overdrives −tPHL 1233729 Input Bias Current vs. Common Mode Voltage 1233730 Input Bias Current vs. Common Mode Voltage 1233731 Input Bias Current vs. Common Mode Voltage 1233732 7 www.national.com LMC7211

Input Bias Current vs. Temperature 1233733

Application Information

1.0 Benefits of the LMC7211 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 Com- parator makes it possible to use it in PCMCIA type III cards. Simplified Board Layout. The Tiny Comparator can simplify board layout in several ways. First, by placing a comparator 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 re- duced. Low Supply Current. The typical 7 μA supply current of the LMC7211 extends battery life in portable applications, and may allow the reduction of the size of batteries in some ap- plications. Wide Voltage Range. The LMC7211 is characterized at 15V, 5V and 2.7V. Performance data is provided at these popular voltages. This wide voltage range makes the LMC7211 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 LMC7211 can be thought of as a one-bit a/d converter. Push-Pull Output. The push-pull output of the LMC7211 is capable of both sourcing and sinking milliamp level currents even at a 2.7 volt supply. This can allow the LMC7211 to drive multiple logic gates. Driving LEDs (Light Emitting Diodes). With a 5 volt power supply, the LMC7211's output sinking current can drive small, high efficiency LEDs for indicator and test point circuits. 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 LMC7211 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 sup- ply, 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. Zero Crossing Detector. Since the LMC7211's common mode input range extends below ground even when powered by a single positive supply, it can be used with large input resistors as a zero crossing detector. Low Input Currents and High Input Impedance. These characteristics allow the LMC7211 to be used to sense high impedance signals from sensors. They also make it possible to use the LMC7211 in timing circuits built with large value resistors. This can reduce the power dissipation of timing cir- cuits. For very long timing circuits, using high value resistors can reduce the size and cost of large value capacitors for the same R-C time constant. Direct Sensor Interfacing. The wide input voltage range and high impedance of the LMC7211 may make it possible to di- rectly interface to a sensor without the use of amplifiers or bias circuits. In circuits with sensors which can produce outputs in the tens to hundreds of millivolts, the LMC7211 can compare the sensor signal with an appropriately small reference volt- age. This may be done close to ground or the positive supply rail. Direct sensor interfacing may eliminate the need for an amplifier for the sensor signal. Eliminating the amplifier can save cost, space, and design time.

2.0 Low Voltage Operation

Comparators are the common devices by which analog sig- nals interface with digital circuits. The LMC7211 has been designed to operate at supply voltages of 2.7V without sacri- ficing performance to meet the demands of 3V digital sys- tems. At supply voltages of 2.7V, the common-mode voltage range extends 200 mV (guaranteed) below the negative supply. This feature, in addition to the comparator being able to sense signals near the positive rail, is extremely useful in low voltage applications. www.national.com 8 LMC7211

FIGURE 1. Even at Low-Supply Voltage of 2.7V, an Input μs with overdrives of 100 mV.

3.0 Shoot-Through Current

FIGURE 2. Circuit for Measurement of the FIGURE 3. Measurement of the Shoot-Through Current result in an effective threshold shift of about 1 mV to 10 mV. equal to or less than the hysteresis of the comparator circuit. to make the capacitor larger.

sive bypass capacitors in non-critical circuits.

4.0 Output Short Circuit Current

the supply rails, and varistors may be used.

5.0 Hysteresis

teresis to the switching can reduce or eliminate this problem. noise immunity for the circuit. See Figure 4, Figure 5 and Figure 6. voltage and shift the voltage thresholds. FIGURE 4. Positive Feedback for Hysteresis

6.0 Input Protection

7.0 Layout Considerations

8.0 Open Drain Output, Dual Versions

The LMC7221 is a comparator similar to the LMC7211, but with an open drain output which allows the output voltage to be different (higher or lower) than the supply voltage. The open drain output is like the open collector output of a logic gate. This makes the LMC7221 very useful for mixed voltage systems. Many systems will have different voltages for the analog and microprocessor sections. Please see the LMC7221 datasheet for details. The performance of the LMC7211 is available in dual devices. Please see the LMC6762 datasheet for details on a dual push-pull output device. For a dual device with open drain outputs, please see the LMC6772 datasheet. Rail-to-Rail Input Low Power Comparators— Push-Pull Output LMC7211 SOT23-5, SO-8 Single LMC6762 SO-8, Dual Open Drain Output LMC7221 SOT23-5, SO-8 Single LMC6772 SO-8, DIP Dual

9.0 Additional SOT23-5 Tiny Devices

National Semiconductor has additional parts available in the space saving SOT23 Tiny package, including amplifiers, volt- age references, and voltage regulators. These devices in- clude— LMC7101 1 MHz gain-bandwidth rail-to-rail input and output amplifier—high input impedance and high gain 700 μA typical current 2.7V, 3V, 5V and 15V spec- ifications. LMC7111 Low power 50 kHz gain-bandwidth rail-to-rail in- put and output amplifier with 25 μA typical current specified at 2.7V, 3.0V, 3.3V, 5V and 10V. LM7131 Tiny Video amp with 70 MHz gain bandwidth 3V, 5V and ±5V specifications. LP2980 Micropower SOT 50 mA Ultra Low-Dropout Reg- ulator. LM4040 Precision micropower shunt voltage reference. Fixed voltages of 2.500V, 4.096V, 5.000V, 8.192V and 10.000V. LM4041 Precision micropower shut voltage reference 1.225V and adjustable. LM385 Low current voltage reference. Fixed Voltages of 1.2V and 2.5V. Contact your National Semiconductor representative for the latest information.

10.0 Spice Macromodel

A Spice Macromodel is available for the LMC7211 compara- tor on the National Semiconductor Amplifier Macromodel disk. Contact your National Semiconductor representative to obtain the latest version. 11 www.national.com LMC7211

SOT-23-5 Tape and Reel Specification REEL DIMENSIONS 1233713 Tape Size A B C D N W1 W2 W3 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 www.national.com 12 LMC7211

Tape Size DIM A DIM Ao DIM B DIM Bo DIM F DIM Ko DIM P1 DIM W 13 www.national.com LMC7211

Physical Dimensions inches (millimeters) unless otherwise noted 5-Pin SOT Package 8-Pin Small Outline Package www.national.com 14 LMC7211

15 www.national.com LMC7211

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