Datasheet

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LMC7211-N

www.ti.com

SNOS746F –MAY 2004–REVISED JANUARY 2013

LMC7211 Tiny CMOS Comparator with Rail-to-Rail Input and Push-Pull Output

Check for Samples: LMC7211-N

FEATURES

APPLICATIONS

• Tiny SOT 23-5 package saves space

• Battery Powered Products

• Package is less than 1.43 mm thick • Notebooks and PDAs

• Guaranteed specs at 2.7V, 5V, 15V supplies • PCMCIA cards

• Typical supply current 7 μA at 5V • Mobile Communications

• Response time of 4 μs at 5V • Alarm and Security circuits

• Push-pull output • Direct Sensor Interface

• Input common-mode range beyond V− and V+ • Replaces amplifiers used as comparators with

better performance and lower current

• Low input current

DESCRIPTION

The LMC7211 is a micropower CMOS comparator available in the space saving SOT23-5 package. This makes

the comparator 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.

CONNECTION DIAGRAM

Figure 1. 8-Pin SOIC-8 Figure 2. 5-Pin SOT23-5

Top View Top View

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (22 pages)

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LMC7211-N www.ti.com SNOS746F – MAY 2004 – REVISED JANUARY 2013 LMC7211 Tiny CMOS Comparator with Rail-to-Rail Input and Push-Pull Output Check for Samples: LMC7211-N FEATURES APPLICATIONS • • • • • • • • • • • • • • • 1 2 Tiny SOT 23-5 package saves space Package is less than 1.43 mm thick Guaranteed specs at 2.
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LMC7211-N SNOS746F – MAY 2004 – REVISED JANUARY 2013 Absolute Maximum Ratings ESD Tolerance www.ti.com (1) (2) 2 kV Differential Input Voltage (VCC) +0.3V to (−VCC)−0.3V Voltage at Input/Output Pin (VCC) + 0.3V to (−VCC)−0.
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LMC7211-N www.ti.com SNOS746F – MAY 2004 – REVISED JANUARY 2013 2.7V Electrical Characteristics (continued) 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. Symbol CMVR Parameter Input Common-Mode Voltage Range Conditions Typ (1) LMC7211AI Limit (2) LMC7211BI Limit (2) Units CMRR > 55 dB 3.0 2.9 2.7 2.9 2.7 V min CMRR > 55 dB −0.3 −0.2 0.0 −0.2 0.
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LMC7211-N SNOS746F – MAY 2004 – REVISED JANUARY 2013 www.ti.com 5.0V and 15.0V Electrical Characteristics (continued) 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.
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LMC7211-N www.ti.com SNOS746F – MAY 2004 – REVISED JANUARY 2013 Typical Performance Characteristics Single Supply TA = 25°C unless specified Supply Current vs. Supply Voltage Supply Current vs. Temperature while Sourcing Supply Current vs. Temperature while Sinking Output Sourcing Current vs. Supply Voltage Output Sinking Current vs. Supply Voltage Output Sourcing Current vs.
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LMC7211-N SNOS746F – MAY 2004 – REVISED JANUARY 2013 www.ti.com Typical Performance Characteristics (continued) Single Supply TA = 25°C unless specified 6 Output Sinking Current vs. Output Voltage @ 5V Output Sourcing Current vs. Output Voltage @ 15V Output Sinking Current vs.
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LMC7211-N www.ti.com SNOS746F – MAY 2004 – REVISED JANUARY 2013 Typical Performance Characteristics (continued) Single Supply TA = 25°C unless specified Response Time for Various Input Overdrives −tPHL Response Time for Various Input Overdrives −tPLH Response Time for Various Input Overdrives −tPHL Input Bias Current vs. Common Mode Voltage Input Bias Current vs. Common Mode Voltage Input Bias Current vs.
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LMC7211-N SNOS746F – MAY 2004 – REVISED JANUARY 2013 www.ti.com Typical Performance Characteristics (continued) Single Supply TA = 25°C unless specified Input Bias Current vs.
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LMC7211-N www.ti.com SNOS746F – MAY 2004 – REVISED JANUARY 2013 APPLICATION INFORMATION 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.
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LMC7211-N SNOS746F – MAY 2004 – REVISED JANUARY 2013 www.ti.com 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. Figure 3. Even at Low-Supply Voltage of 2.7V, an Input Signal which Exceeds the Supply Voltages Produces No Phase Inversion at the Output At V+ = 2.
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LMC7211-N www.ti.com SNOS746F – MAY 2004 – REVISED JANUARY 2013 Figure 5. Measurement of the Shoot-Through Current From Figure 5, the shoot-through current for the LMC7211 can be calculated to be 0.2 mA (typical), and the duration is 1 μs. The values needed for the bypass capacitors can be calculated as follows: Area of Δ = ½ (1 μs × 200 μA) = 100 pC The capacitor needs to supply 100 picocolumb.
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LMC7211-N SNOS746F – MAY 2004 – REVISED JANUARY 2013 www.ti.com Output Short Circuit Current The LMC7211 has short circuit protection of 40 mA. However, it is not designed to withstand continuous short circuits, transient voltage or current spikes, or shorts to any voltage beyond the supplies. A resistor in series with the output should reduce the effect of shorts. For outputs which send signals off PC boards additional protection devices, such as diodes to the supply rails, and varistors may be used.
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LMC7211-N www.ti.com SNOS746F – MAY 2004 – REVISED JANUARY 2013 Figure 8. With Positive Feedback (Hysteresis or Memory) Input Protection If input signals are like to exceed the common mode range of the LMC7211, or it is likely that signals may be present when power is off, damage to the LMC7211 may occur. Large value (100 kΩ to MΩ) input resistors may reduce the likelihood of damage by limiting the input currents.
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LMC7211-N SNOS746F – MAY 2004 – REVISED JANUARY 2013 www.ti.com Push-Pull Output LMC7211 SOT23-5, SO-8 Single LMC6762 SO-8, Dual LMC7221 SOT23-5, SO-8 Single LMC6772 SO-8, DIP Dual Open Drain Output Additional SOT23-5 Tiny Devices National Semiconductor has additional parts available in the space saving SOT23 Tiny package, including amplifiers, voltage references, and voltage regulators.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined.
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PACKAGE MATERIALS INFORMATION www.ti.com 25-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) LMC7211AIM5 SOT-23 DBV 5 1000 178.0 8.4 LMC7211AIM5/NOPB SOT-23 DBV 5 1000 178.0 LMC7211AIM5X SOT-23 DBV 5 3000 178.0 LMC7211AIM5X/NOPB SOT-23 DBV 5 3000 LMC7211AIMX/NOPB SOIC D 8 W Pin1 (mm) Quadrant 3.2 3.2 1.4 4.0 8.0 Q3 8.4 3.2 3.2 1.
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PACKAGE MATERIALS INFORMATION www.ti.com 25-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMC7211AIM5 SOT-23 DBV 5 1000 210.0 185.0 35.0 LMC7211AIM5/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LMC7211AIM5X SOT-23 DBV 5 3000 210.0 185.0 35.0 LMC7211AIM5X/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LMC7211AIMX/NOPB SOIC D 8 2500 367.0 367.0 35.0 LMC7211BIM5 SOT-23 DBV 5 1000 210.0 185.0 35.
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