Datasheet

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LM809, LM810

www.ti.com

SNVS052D –SEPTEMBER 1999–REVISED MAY 2013

LM809/LM810 3-Pin Microprocessor Reset Circuits

Check for Samples: LM809, LM810

FEATURES

DESCRIPTION

The LM809/810 microprocessor supervisory circuits

• Precise Monitoring of 3V, 3.3V, and 5V Supply

can be used to monitor the power supplies in

Voltages

microprocessor and digital systems. They provide a

• Superior Upgrade to MAX809/810

reset to the microprocessor during power-up, power-

• Fully Specified Over Temperature

down and brown-out conditions.

• 140ms Min. Power-On Reset Pulse Width,

The function of the LM809/810 is to monitor the V

240ms Typical

supply voltage, and assert a reset signal whenever

this voltage declines below the factory-programmed

– Active-Low RESET Output (LM809)

reset threshold. The reset signal remains asserted for

– Active-High RESET Output (LM810)

240ms after V

rises above the threshold. The

• Ensured RESET Output Valid for V

≥1V

LM809 has an active-low RESET output, while the

LM810 has an active-high RESET output.

• Low Supply Current, 15µA Typ

• Power Supply Transient Immunity

Seven standard reset voltage options are available,

suitable for monitoring 5V, 3.3V, and 3V supply

APPLICATIONS voltages.

• Microprocessor Systems

With a low supply current of only 15µA, the

LM809/810 are ideal for use in portable equipment.

• Computers

The LM809/LM810 are available in the 3-pin SOT-23

• Controllers

package and in the 6-Lead SON package.

• Intelligent Instruments

• Portable/Battery-Powered Equipment

• Automotive

Connection Diagrams Typical Application Circuit

Top View Top View

Figure 1. 3-Lead Figure 2. 6-Lead

SOT-23-3 Package SON Package

See Package Number See Package Number

DBZ NGB0006A

( ) are for LM810 () are for LM810

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 (14 pages)

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LM809, LM810 www.ti.com SNVS052D – SEPTEMBER 1999 – REVISED MAY 2013 LM809/LM810 3-Pin Microprocessor Reset Circuits Check for Samples: LM809, LM810 FEATURES DESCRIPTION • The LM809/810 microprocessor supervisory circuits can be used to monitor the power supplies in microprocessor and digital systems. They provide a reset to the microprocessor during power-up, powerdown and brown-out conditions. 1 2 • • • • • • Precise Monitoring of 3V, 3.
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LM809, LM810 SNVS052D – SEPTEMBER 1999 – REVISED MAY 2013 www.ti.com Pin Descriptions PIN SON SOT-23 1 1 3 NAME GND Ground reference RESET (LM809) Active-low output. RESET remains low while VCC is below the reset threshold, and for 240ms after VCC rises above the reset threshold. RESET (LM810) Active-high output. RESET remains high while VCC is below the reset threshold, and for 240ms after VCC rises above the reset threshold. 2 5 FUNCTION 3 VCC Supply Voltage (+5V, +3.3V, or +3.
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LM809, LM810 www.ti.com SNVS052D – SEPTEMBER 1999 – REVISED MAY 2013 Electrical Characteristics VCC = full range, TA = −40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = 5V for 4.63/4.38/4.00 versions, VCC = 3.3V for 3.08/2.93 versions, and VCC = 3V for 2.63/2.45 version (1). Parameter VCC Range Test Conditions Supply Current TA = −40°C to +105°C 1.2 5.5 TA = +85°C to +105°C LM8_ _ -4.38 LM8_ _ -4.00 Reset Threshold (2) LM8_ _ -3.08 LM8_ _ -2.93 LM8_ _ -2.
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LM809, LM810 SNVS052D – SEPTEMBER 1999 – REVISED MAY 2013 www.ti.com Electrical Characteristics (continued) VCC = full range, TA = −40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = 5V for 4.63/4.38/4.00 versions, VCC = 3.3V for 3.08/2.93 versions, and VCC = 3V for 2.63/2.45 version(1). Parameter 4 VOL RESET Output Voltage Low (LM810) VOH RESET Output Voltage High (LM810) Test Conditions Min Typ Max VCC = VTH max, ISINK = 1.2mA, LM8102.63/2.93/3.08 0.
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LM809, LM810 www.ti.com SNVS052D – SEPTEMBER 1999 – REVISED MAY 2013 Typical Performance Characteristics Supply Current vs Temperature (No Load, LM8_ _-2.63/2.93/3.08) Supply Current vs Temperature (No Load, LM8_ _-4.63/4.38) Figure 3. Figure 4. Power-Down Reset Delay vs Temp (LM8_ _-2.63/2.93/3.08) Power-Down Reset Delay vs Temperature (LM8_ _-4.63/4.38) Figure 5. Figure 6. Power-Up Reset Timeout vs Temperature Normalized Reset Threshold vs Temperature Figure 7. Figure 8.
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LM809, LM810 SNVS052D – SEPTEMBER 1999 – REVISED MAY 2013 www.ti.com APPLICATIONS INFORMATION Benefits of Precision Reset Thresholds A microprocessor supply supervisor must provide a reset output within a predictable range of the supply voltage. A common threshold range is between 5% and 10% below the nominal supply voltage. The 4.63V and 3.08V options of the LM809/810 use highly accurate circuitry to ensure that the reset threshold occurs only within this range (for 5V and 3.3V supplies).
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LM809, LM810 www.ti.com SNVS052D – SEPTEMBER 1999 – REVISED MAY 2013 Figure 10. Maximum Transient Duration without Causing a Reset Pulse vs. Reset Comparator Overdrive Interfacing to µPs with Bidirectional Reset Pins Microprocessors with bidirectional reset pins, such as the Motorola 68HC11 series, can be connected to the LM809 RESET output. To ensure a correct output on the LM809 even when the microprocessor reset pin is in the opposite state, connect a 4.
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LM809, LM810 SNVS052D – SEPTEMBER 1999 – REVISED MAY 2013 www.ti.com REVISION HISTORY Changes from Revision C (May 2013) to Revision D • 8 Page Changed layout of National Data Sheet to TI format ............................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM809M3-2.63 NRND SOT-23 DBZ 3 1000 TBD Call TI Call TI -40 to 105 S3B LM809M3-2.63/NOPB ACTIVE SOT-23 DBZ 3 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 105 S3B LM809M3-2.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (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.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-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) LM809M3-2.63 SOT-23 DBZ 3 1000 178.0 8.4 LM809M3-2.63/NOPB SOT-23 DBZ 3 1000 178.0 LM809M3-2.93 SOT-23 DBZ 3 1000 178.0 LM809M3-2.93/NOPB SOT-23 DBZ 3 1000 LM809M3-3.08 SOT-23 DBZ 3 LM809M3-3.08/NOPB SOT-23 DBZ LM809M3-4.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM809M3-2.63 SOT-23 DBZ 3 1000 210.0 185.0 35.0 LM809M3-2.63/NOPB SOT-23 DBZ 3 1000 210.0 185.0 35.0 LM809M3-2.93 SOT-23 DBZ 3 1000 210.0 185.0 35.0 LM809M3-2.93/NOPB SOT-23 DBZ 3 1000 210.0 185.0 35.0 LM809M3-3.08 SOT-23 DBZ 3 1000 210.0 185.0 35.0 LM809M3-3.08/NOPB SOT-23 DBZ 3 1000 210.
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