Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - system monitor Reset/power-on reset SOT 23 5

GND

LM3724

PUSHBUTTON

SWITCH

RESET

INPUT

GND

RESET

GND

LM3722

LM3723

PUSHBUTTON

SWITCH

RESET

INPUT

*(RESET)

RESET

GND

LM3722, LM3723, LM3724

www.ti.com

SNVS154E –MAY 2001–REVISED MARCH 2013

LM3722/LM3723/LM3724 5-Pin Microprocessor Reset Circuits

Check for Samples: LM3722, LM3723, LM3724

FEATURES

DESCRIPTION

The LM3722/LM3723/LM3724 microprocessor

• Precise Monitoring of 2.5V, 3.3V, and 5V

supervisory circuits monitor the power supplies in

Supply Voltages

microprocessor and digital systems. They provide a

• Fully Specified Over Temperature

reset to the microprocessor during power-up, power-

– Industrial: −40°C to +85°C

down, brown-out conditions, and manual reset.

– Extended: −40°C to +125°C

The LM3722/LM3723/LM3724 asserts a reset signal

whenever the supply decreases below the factory-

• 100 ms Minimum Power-On Reset pulse Width,

programmed reset threshold. Reset will be asserted

190 ms Typical:

for at least 100ms even after V

rises above the

– Active-Low RESET Output (LM3722)

reset threshold.

– Active-High RESET Output (LM3723)

The LM3722 has an active-low RESET push-pull

– Active-Low RESET Open Drain Output

output. The LM3723 has an active-high RESET push-

(LM3724)

pull output. The LM3724 has an active-low open-drain

• Guaranteed RESET Output Valid for V

≥ 1V

RESET output.

• Low Supply Current, 6µA Typical

Three standard reset voltage options are available,

• Power Supply Transient Immunity

suitable for monitoring 5V, 3.3V, and 2.5V supply

voltages. Additional reset voltages are also available;

• Compatible with MAX811/812 Applications

contact Texas Instruments for details.

APPLICATIONS

With a low supply current of only 6µA, the

LM3722/LM3723/LM3724 are ideal for use in portable

• Microprocessor Systems

equipment. The LM3722/LM3723/LM3724 are

• Computers

available in the 5-pin SOT-23 package.

• Controllers

• Intelligent Instruments

• Portable/Battery-Powered Equipment

Typical Application Circuits

Figure 1. Typical Application Circuit Figure 2. Typical Application Circuit with R

Connection

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 (19 pages)

PAGE 1
LM3722, LM3723, LM3724 www.ti.com SNVS154E – MAY 2001 – REVISED MARCH 2013 LM3722/LM3723/LM3724 5-Pin Microprocessor Reset Circuits Check for Samples: LM3722, LM3723, LM3724 FEATURES DESCRIPTION • The LM3722/LM3723/LM3724 microprocessor supervisory circuits monitor the power supplies in microprocessor and digital systems. They provide a reset to the microprocessor during power-up, powerdown, brown-out conditions, and manual reset. 1 2 • • • • • • Precise Monitoring of 2.5V, 3.
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LM3722, LM3723, LM3724 SNVS154E – MAY 2001 – REVISED MARCH 2013 www.ti.com Connection Diagram 5 VCC GND 1 GND 2 LM3722 LM3723 LM3724 RESET 3 *(RESET) 4 MR *( ) are for LM3723 Figure 3. SOT-23-5 PIN DESCRIPTIONS PIN NAME 1 GND Ground reference GND Ground reference, device substrate, connect to ground. 2 3 FUNCTION RESET LM3722/LM3724 RESET LM3723 Active-low output.
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LM3722, LM3723, LM3724 www.ti.com SNVS154E – MAY 2001 – REVISED MARCH 2013 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. Absolute Maximum Ratings (1) (2) −0.3V to 6.0V VCC, MR −0.3V to (VCC+ 0.
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LM3722, LM3723, LM3724 SNVS154E – MAY 2001 – REVISED MARCH 2013 www.ti.com Electrical Characteristics (continued) Typical values are at TA = +25°C. Limits with standard typeface are for TA = +25°C, and limits in boldface type apply for the operating temperature range (−40°C to +85°C) for LM372_IM5X, and (−40°C to +125°C) for LM372_EM5X, unless otherwise noted. (1) Symbol Parameter VIH VIL VIH Conditions Min VCC > VTH(MAX), LM372_ -4.63 VCC > VTH(MAX), LM372_ -3.08, LM372_ -2.32 0.
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LM3722, LM3723, LM3724 www.ti.com SNVS154E – MAY 2001 – REVISED MARCH 2013 Typical Performance Characteristics Supply Current vs VCC Supply Current vs Temperature 10 9 VCC = 5.5V 8 SUPPLY CURRENT (PA) 7 ICC (PA) 6 5 4 3 2 8 6 VCC = 3.6V 4 VCC = 2.5V 2 1 0 -40 0 0 1 2 4 3 5 6 10 35 60 TEMPERATURE (oC) Figure 5. Figure 6. Reset Timeout vs VCC Reset Timeout vs Temperature 1.05 85 210 200 RESET TIMEOUT (ms) NORMALIZED RESET TIMEOUT -15 VCC (V) 1.025 1 0.
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LM3722, LM3723, LM3724 SNVS154E – MAY 2001 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) LM3724 Low VCC Characteristics 700 RESET VOLTAGE (mV) 600 10 k: Pull-Up Resistor 500 400 300 200 100 0 0.0 0.5 1.0 1.5 2.0 VCC (V) Figure 11.
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LM3722, LM3723, LM3724 www.ti.com SNVS154E – MAY 2001 – REVISED MARCH 2013 Timing Diagram Figure 12. Timing Diagram Circuit Information RESET OUTPUT The reset input of a µP initializes the device into a known state. The LM3722/LM3723/LM3724 microprocessor voltage monitoring circuits assert a forced reset output to prevent code execution errors during power-up, powerdown, and brownout conditions. RESET is guaranteed valid for VCC ≥ 1V.
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LM3722, LM3723, LM3724 SNVS154E – MAY 2001 – REVISED MARCH 2013 www.ti.com MANUAL RESET INPUT (MR) Many µP-based products require a manual reset capability, allowing the operator to initiate a reset. The MR input is fully debounced and provides an internal 22 kΩ pull-up. When the MR input is pulled below VIL (0.25VCC) for more than 100 ns, reset is asserted after a typical delay of 2 µs.
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LM3722, LM3723, LM3724 www.ti.com SNVS154E – MAY 2001 – REVISED MARCH 2013 NEGATIVE-GOING VCC TRANSIENTS The LM3722/LM3723/LM3724 are relatively immune to short negative-going transients or glitches on VCC. Figure 14 shows the maximum pulse width a negative-going VCC transient can have without causing a reset pulse. In general, as the magnitude of the transient increases, going further below the threshold, the maximum allowable pulse width decreases.
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LM3722, LM3723, LM3724 SNVS154E – MAY 2001 – REVISED MARCH 2013 www.ti.com VIN IN VOUT OUT + LM2941 SD GND 24.9k 2.2PF ADJ 7.15k 14.7k 11.5k VOUT = 3.3V VCC VIN(TRIP) = 5.0V LM3722 RESET MR OVERRIDE 5V 4V VIN 3.3V VOUT tRP RESET Figure 16. Regulator/Switch with Long-Term Overvoltage Lockout Prevents Overdissipation in Linear Regulator 3.3V VCC RESET LM3722 MR RESET GND tRP tRP tRP Mechanical Switch MR Figure 17.
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LM3722, LM3723, LM3724 www.ti.com SNVS154E – MAY 2001 – REVISED MARCH 2013 MTP50P03HDL VIN VOUT LOAD C VCC RESET R LM3723 GND VIN VOUT RESET tRP Figure 18.
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LM3722, LM3723, LM3724 SNVS154E – MAY 2001 – 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.com 7-Oct-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish (2) MSL Peak Temp Op Temp (°C) Device Marking (3) (4/5) LM3724EM5-3.08/NOPB ACTIVE SOT-23 DBV 5 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 R63B LM3724EM5-4.63/NOPB ACTIVE SOT-23 DBV 5 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 R62B LM3724EM5X-4.
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PACKAGE OPTION ADDENDUM www.ti.com 7-Oct-2013 (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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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) LM3724EM5-3.08/NOPB SOT-23 DBV 5 1000 178.0 8.4 LM3724EM5-4.63/NOPB SOT-23 DBV 5 1000 178.0 LM3724EM5X-4.63/NOPB SOT-23 DBV 5 3000 178.0 W Pin1 (mm) Quadrant 3.2 3.2 1.4 4.0 8.0 Q3 8.4 3.2 3.2 1.4 4.0 8.0 Q3 8.4 3.2 3.2 1.4 4.0 8.
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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) LM3724EM5-3.08/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LM3724EM5-4.63/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LM3724EM5X-4.63/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LM3724IM5-2.32/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LM3724IM5-3.08/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LM3724IM5-4.
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