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LMC7221

www.ti.com

SNOS748E –SEPTEMBER 1999–REVISED MARCH 2013

LMC7221 Tiny CMOS Comparator with Rail-To-Rail Input and Open Drain Output

Check for Samples: LMC7221

FEATURES

DESCRIPTION

The LM7221 is a micropower CMOS comparator

• Tiny 5-Pin SOT-23 package saves space

available in the space saving 5-Pin SOT-23 package.

• Package is less than 1.43 mm thick

This makes this comparator ideal for space and

• Ensured specs at 2.7V, 5V, 15V supplies

weight critical designs. The LMC7221 is also

available in the 8-Pin SOIC package. The LMC7221

• Typical supply current 7 μA at 5V

is supplied in two offset voltage grades, 5 mV and 15

• Response time of 4 μs at 5V

mV.

• LMC7221—open drain output

The open drain output can be pulled up with a

• Input common-mode range beyond V

−

and V

resistor to a voltage which can be higher or lower

• Low input current

than the supply voltage—this makes the part useful

for mixed voltage systems.

APPLICATIONS

For a tiny comparator with a push-pull output, please

• Mixed voltage battery powered products

see the LMC7211 datasheet.

• Notebooks and PDAs

• PCMCIA cards

• Mobile communications

• Alarm and security circuits

• Driving low current LEDs

• Direct sensor interface

Connection Diagram

8-Pin SOIC - Top View 5-Pin SOT-23 - Top View

Figure 1. See Package Number D0008A Figure 2. See Package Number DBV0005A

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 (20 pages)

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LMC7221 www.ti.com SNOS748E – SEPTEMBER 1999 – REVISED MARCH 2013 LMC7221 Tiny CMOS Comparator with Rail-To-Rail Input and Open Drain Output Check for Samples: LMC7221 FEATURES DESCRIPTION • • • • • • • • The LM7221 is a micropower CMOS comparator available in the space saving 5-Pin SOT-23 package. This makes this comparator ideal for space and weight critical designs. The LMC7221 is also available in the 8-Pin SOIC package. The LMC7221 is supplied in two offset voltage grades, 5 mV and 15 mV.
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LMC7221 SNOS748E – SEPTEMBER 1999 – REVISED MARCH 2013 Absolute Maximum Ratings ESD Tolerance www.ti.com (1) (2) 2 kV Differential Input Voltage V+ +0.3V, V− −0.3V Voltage at Input V+ +0.3V, V− −0.3V Voltage at Output Pin + 15V − 16V (3) ±5 mA Supply Voltage (V –V ) Current at Input Pin Current at Output Pin (4) (5) ±30 mA Current at Power Supply Pin 40 mA Lead Temperature (soldering, 10 sec.
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LMC7221 www.ti.com SNOS748E – SEPTEMBER 1999 – REVISED MARCH 2013 2.7V Electrical Characteristics (continued) Unless otherwise specified, all limits ensured for TJ = 25°C, V+ = 2.7V, V− = 0V, VCM = VO = V+/2. Boldface limits apply at the temperature extremes. Parameter AV Voltage Gain CMVR Input Common-Mode Voltage Range VOL Output Voltage Low IS Supply Current Test Conditions Typ (1) LMC7221AI Limit (2) LMC7221BI Limit (2) 2.9 2.9 V 2.7 2.7 min −0.2 −0.2 V 0.0 0.0 max 0.3 0.
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LMC7221 SNOS748E – SEPTEMBER 1999 – REVISED MARCH 2013 www.ti.com 5.0V and 15.0V Electrical Characteristics (continued) Unless otherwise specified, all limits ensured 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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LMC7221 www.ti.com SNOS748E – SEPTEMBER 1999 – REVISED MARCH 2013 Typical Performance Characteristics Supply Current vs. Supply Voltage Supply Current vs. Temperature while Sinking Figure 3. Figure 4. Output Sinking Current vs. Supply Voltage Output Sinking Current vs. Output Voltage @ 5V Figure 5. Figure 6. Output Sinking Current vs. Output Voltage @ 15V Response Time for Various Input Overdrives −tPHL Figure 7. Figure 8.
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LMC7221 SNOS748E – SEPTEMBER 1999 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) 6 Response Time vs. Various Input Overdrives −tPHL Response Time vs Various Input Overdrives −tPHL Figure 9. Figure 10. Input Bias Current vs. Common Mode Voltage Input Bias Current vs. Common Mode Voltage Figure 11. Figure 12. Input Bias Current vs. Common Mode Voltage Input Bias Current vs. Temperature Figure 13. Figure 14.
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LMC7221 www.ti.com SNOS748E – SEPTEMBER 1999 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Leakage Current vs. Supply Voltage Figure 15. APPLICATION INFORMATION BENEFITS OF THE LMC7221 TINY COMPARATOR Size The small footprint of the 5-Pin SOT-23 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.
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LMC7221 SNOS748E – SEPTEMBER 1999 – REVISED MARCH 2013 www.ti.com 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 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 LMC7221 is slightly larger than the actual power supply range.
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LMC7221 www.ti.com SNOS748E – SEPTEMBER 1999 – REVISED MARCH 2013 OPEN DRAIN OUTPUT Output Stage Figure 17. Output Stage Figure 17 shows the difference between push-pull output and open drain output. Push pull outputs will have a conventional high or low digital output, the same as a logic gate. Low will be the negative supply rail (usually ground) and high will be the positive supply rail. This is useful if the chips you are interfacing to run on the same supply voltage as the comparator.
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LMC7221 SNOS748E – SEPTEMBER 1999 – REVISED MARCH 2013 www.ti.com Figure 18. LAYOUT CONSIDERATIONS The LMC7221 is not an especially fast comparator, so high speed design practices are not required. The LMC7221 is capable of operating with very high impedance inputs, so precautions should be taken to reduce noise pickup with high impedance (∼ 100 kΩ and greater) designs and in electrically noisy environments.
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LMC7221 www.ti.com SNOS748E – SEPTEMBER 1999 – REVISED MARCH 2013 Contact your TI representative for the latest information. SPICE MACROMODEL A Spice Macromodel is available for the LMC7221 comparator on the TI Amplifier Macromodel disk. Contact your TI representative to obtain the latest version.
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LMC7221 SNOS748E – SEPTEMBER 1999 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision D (March 2013) to Revision E • 12 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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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 8-Apr-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) LMC7221AIM5 SOT-23 DBV 5 1000 178.0 8.4 LMC7221AIM5/NOPB SOT-23 DBV 5 1000 178.0 LMC7221AIM5X SOT-23 DBV 5 3000 178.0 LMC7221AIM5X/NOPB SOT-23 DBV 5 3000 LMC7221AIMX SOIC D 8 W Pin1 (mm) Quadrant 3.2 3.2 1.4 4.0 8.0 Q3 8.4 3.2 3.2 1.4 4.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMC7221AIM5 SOT-23 DBV 5 1000 210.0 185.0 35.0 LMC7221AIM5/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LMC7221AIM5X SOT-23 DBV 5 3000 210.0 185.0 35.0 LMC7221AIM5X/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LMC7221AIMX SOIC D 8 2500 367.0 367.0 35.0 LMC7221AIMX/NOPB SOIC D 8 2500 367.0 367.0 35.
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