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LM3724  Product Folder

5-Pin Microprocessor Reset Circuits
Generic P/N 3724
General
Description		 Features Datasheet Package
& Models		 Samples
& Pricing		 Reliability
Metrics

Parametric Table Parametric Table
Temperature Min (deg C) -40 
Temperature Max (deg C) 125 
Multiple Output Capability No 
On/Off Pin Yes 
Error Flag Yes 
InputMin Voltage (Volt) 1 
InputMax Voltage (Volt) 6 
Output Current (mA) 20 
Output Voltage (Volt) - 
Adjustable Output Yes 
Switching Frequency (Hz) - 
Adj Switch Frequency No 
Sync Pin No 
Power on Reset Yes 
Watchdog No 
Power Fail Input No 
Manual Reset Yes 

Datasheet

TitleSize in KbytesDate
View Online
Download
Receive via Email
LM3722 LM3723 LM3724 5-Pin Microprocessor Reset Circuits 219 Kbytes 5-Jun-01 View Online Download Receive via Email

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Package Availability, Models, Samples & Pricing

Part NumberPackageStatusModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
TypePinsMSL/Lead-Free AvailabilityLead
Time		QtySPICEIBISQty$US each
LM3724EM5-2.32SOT-235StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.95reel
of
1000		R64B
ZXTT
16-18 weeks50000
LM3724EM5-3.08SOT-235StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.95reel
of
1000		R63B
ZXTT
16-18 weeks50000
LM3724EM5-4.63SOT-235StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.95reel
of
1000		R62B
ZXTT
16-18 weeks50000
LM3724IM5-2.32SOT-235StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.80reel
of
1000		R50B
ZXTT
16-18 weeks50000
LM3724IM5-3.08SOT-235StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.80reel
of
1000		R53B
ZXTT
16-18 weeks50000
LM3724IM5-4.63SOT-235StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.80reel
of
1000		R55B
ZXTT
16-18 weeks50000
LM3724EM5X-2.32SOT-235StatusFull productionN/AN/A 1K+$0.95reel
of
3000		R64B
ZXTT
16-18 weeks50000
LM3724EM5X-3.08SOT-235StatusFull productionN/AN/A 1K+$0.95reel
of
3000		R63B
ZXTT
16-18 weeks50000
LM3724EM5X-4.63SOT-235StatusFull productionN/AN/A 1K+$0.95reel
of
3000		R62B
ZXTT
16-18 weeks50000
LM3724IM5X-2.32SOT-235StatusFull productionN/AN/A 1K+$0.80reel
of
3000		R50B
ZXTT
16-18 weeks50000
LM3724IM5X-3.08SOT-235StatusFull productionN/AN/A 
Buy Now		1K+$0.80reel
of
3000		R53B
ZXTT
17-19 weeks50000
LM3724IM5X-4.63SOT-235StatusFull productionN/AN/A 1K+$0.80reel
of
3000		R55B
ZXTT
16-18 weeks50000
LM3724E2.32 MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM3724E3.08 MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM3724E4.63 MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM3724I2.32 MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM3724I3.08 MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM3724I4.63 MDCUnpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM3724E2.32 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM3724E3.08 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM3724E4.63 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM3724I2.32 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM3724I3.08 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM3724I4.63 MWCWaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0

General 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, power-down, brown-out conditions, and manual reset.

The LM3722/LM3723/LM3724 asserts a reset signal whenever the supply decreases below the factory-programmed reset threshold for at least 100 ms. The reset signal remains asserted for 190 ms after VCC rises above the threshold.

The LM3722 has an active-low RESET# push-pull output. The LM3723 has an active-high RESET push-pull output. The LM3724 has an active-low open-drain RESET# output.

Three standard reset voltage options are available, suitable for monitoring 5V, 3.3V, and 2.5V supply voltages. Additional reset voltages are also available; contact National Semiconductor for details.

With a low supply current of only 6µA, the LM3722/LM3723/LM3724 are ideal for use in portable equipment. The LM3722/LM3723/LM3724 are available in the 5-pin SOT23 package.

Features

  • Precise monitoring of 2.5V, 3.3V, and 5V supply voltages
  • Fully specified over temperature Industrial: -40°C to +85°C Extended: -40°C to +125°C
  • 100 ms minimum Power-On Reset pulse width, 190 ms typical: Active-Low RESET# Output (LM3722) Active-High RESET Output (LM3723) Active-Low RESET# Open Drain Output (LM3724)
  • Guaranteed RESET# Output valid for VCC >= 1V
  • Low Supply Current, 6µA typical
  • Power supply transient immunity
  • Compatible with MAX811/812 applications

Applications

  • Microprocessor Systems
  • Computers
  • Controllers
  • Intelligent Instruments
  • Portable/Battery-Powered Equipment

Reliability Metrics

Part Number Process Early Failure Rate - Rejects Sample Size (EFR) PPM * Rel. Rejects Device Hours Long Term Failure Rates (FITS) MTTF
LM3724E2.32 MDCCS06508800006000006169643205
LM3724E2.32 MWCCS06508800006000006169643205
LM3724E3.08 MDCCS06508800006000006169643205
LM3724E3.08 MWCCS06508800006000006169643205
LM3724E4.63 MDCCS06508800006000006169643205
LM3724E4.63 MWCCS06508800006000006169643205
LM3724EM5-2.32CS06508800006000006169643205
LM3724EM5-3.08CS06508800006000006169643205
LM3724EM5-4.63CS06508800006000006169643205
LM3724EM5X-2.32CS06508800006000006169643205
LM3724EM5X-3.08CS06508800006000006169643205
LM3724EM5X-4.63CS06508800006000006169643205
LM3724I2.32 MDCCS06508800006000006169643205
LM3724I2.32 MWCCS06508800006000006169643205
LM3724I3.08 MDCCS06508800006000006169643205
LM3724I3.08 MWCCS06508800006000006169643205
LM3724I4.63 MDCCS06508800006000006169643205
LM3724I4.63 MWCCS06508800006000006169643205
LM3724IM5-2.32CS06508800006000006169643205
LM3724IM5-3.08CS06508800006000006169643205
LM3724IM5-4.63CS06508800006000006169643205
LM3724IM5X-2.32CS06508800006000006169643205
LM3724IM5X-3.08CS06508800006000006169643205
LM3724IM5X-4.63CS06508800006000006169643205

For more information on Reliablitity Metrics, please click here.


[Information as of 15-Jan-2004]

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