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LM3724 Dataheets PDF



Part Number LM3724
Manufacturers National Semiconductor
Logo National Semiconductor
Description 5-Pin Microprocessor Reset Circuits
Datasheet LM3724 DatasheetLM3724 Datasheet (PDF)

LM3722/LM3723/LM3724 5-Pin Microprocessor Reset Circuits June 2001 LM3722/LM3723/LM3724 5-Pin Microprocessor Reset Circuits 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 th.

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LM3722/LM3723/LM3724 5-Pin Microprocessor Reset Circuits June 2001 LM3722/LM3723/LM3724 5-Pin Microprocessor Reset Circuits 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 n Precise monitoring of 2.5V, 3.3V, and 5V supply voltages n Fully specified over temperature Industrial: −40˚C to +85˚C Extended: −40˚C to +125˚C n 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) n Guaranteed RESET Output valid for VCC ≥ 1V n Low Supply Current, 6µA typical n Power supply transient immunity n Compatible with MAX811/812 applications Applications n n n n n Microprocessor Systems Computers Controllers Intelligent Instruments Portable/Battery-Powered Equipment Typical Application Circuit 20014401 20014437 Connection Diagram SOT23-5 20014402 *( ) are for LM3723 © 2001 National Semiconductor Corporation DS200144 www.national.com LM3722/LM3723/LM3724 Ordering Information Industrial Temperature Range (−40˚C to +85˚C): Reset Threshold (V) 4.63 3.08 2.32 Reset Threshold (V) 4.63 3.08 2.32 Reset Threshold (V) 4.63 3.08 2.32 LM3722 Supplied as 1000 units, tape & reel LM3722IM5-4.63 LM3722IM5-3.08 LM3722IM5-2.32 LM3723 Supplied as 1000 units, tape & reel LM3723IM5-4.63 LM3723IM5-3.08 LM3723IM5-2.32 LM3724 Supplied as 1000 units, tape & reel LM3724IM5-4.63 LM3724IM5-3.08 LM3724IM5-2.32 LM3722 Supplied as 3000 units, tape & reel LM3722IM5X-4.63 LM3722IM5X-3.08 LM3722IM5X-2.32 LM3723 Supplied as 3000 units, tape & reel LM3723IM5X-4.63 LM3723IM5X-3.08 LM3723IM5X-2.32 LM3724 Supplied as 3000 units, tape & reel LM3724IM5X-4.63 LM3724IM5X-3.08 LM3724IM5X-2.32 Package Top Mark R43B R41B R34B Package Top Mark R13B R11B R46B Package Top Mark R55B R53B R50B SOT23-5 MF05A Package Type NSC Package SOT23-5 MF05A Package Type NSC Package SOT23-5 MF05A Package Type NSC Package Extended Temperature Range (−40˚C to +125˚C): Reset Threshold (V) 4.63 3.08 2.32 Reset Threshold (V) 4.63 3.08 2.32 Reset Threshold (V) 4.63 3.08 2.32 LM3722 Supplied as 1000 units, tape & reel LM3722EM5-4.63 LM3722EM5-3.08 LM3722EM5-2.32 LM3723 Supplied as 1000 units, tape & reel LM3723EM5-4.63 LM3723EM5-3.08 LM3723EM5-2.32 LM3724 Supplied as 1000 units, tape & reel LM3724EM5-4.63 LM3724EM5-3.08 LM3724EM5-2.32 LM3722 Supplied as 3000 units, tape & reel LM3722EM5X-4.63 LM3722EM5X-3.08 LM3722EM5X-2.32 LM3723 Supplied as 3000 units, tape & reel LM3723EM5X-4.63 LM3723EM5X-3.08 LM3723EM5X-2.32 LM3724 Supplied as 3000 units, tape & reel LM3724EM5X-4.63 LM3724EM5X-3.08 LM3724EM5X-2.32 Package Top Mark R56B R57B R58B Package Top Mark R59B R60 R61B Package Top Mark R62B R63B R64B SOT23-5 MF05A Package Type NSC Package SOT23-5 MF05A Package Type NSC Package SOT23-5 MF05A Package Type NSC Package Custom voltages and improved accuracies are available, subject to minimum orders. Contact your local National Semiconductor Sales Office for information. www.national.com 2 LM3722/LM3723/LM3724 Pin Description PIN 1 2 NAME GND GND RESET LM3722/LM3724 RESET LM3723 MR VCC Ground reference Ground reference, device substrate, connect to ground. Active-low output. RESET remains low while VCC is below the reset threshold voltage, and for 190 ms after VCC rises above the reset threshold voltage. Active-high output. RESET remains high while VCC is below the reset threshold, and for 190 ms after VCC rises above the reset threshold. Active-low input. Reset is asserted whenever this pin is pulled low and remains asserted for 190 ms after the MR pin goes high. May be left open. Supply Voltage (+5V, +3.3V, or +2.5V, nominal) FUNCTION 3 4 5 Block Diagram LM3722/LM3723/LM3724 Block Diagram 20014435 3 www.national.com LM3722/LM3723/LM3724 Absolute Maximum Ratings (Note 1) Continuous Power Dissipation (TA = +70˚C) SOT-23 (Note 3) Operating Temperature Range Industrial: Extended: Maximum Junction Temperature Storage Temperature Range Lead Temperature (soldering, 10sec) −40˚C to +85˚C −40˚C to +125˚C .


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