SM72240

Manufacturer Part NumberSM72240
ManufacturerTexas Instruments
SM72240 datasheet
 


Specifications of SM72240

Pin/package5SOT  
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SM72240
SM72240 SolarMagic 5-Pin Microprocessor Reset Circuit
Literature Number: SNIS154B

SM72240 Summary of contents

  • Page 1

    ... SM72240 SM72240 SolarMagic 5-Pin Microprocessor Reset Circuit Literature Number: SNIS154B ...

  • Page 2

    ... Reset will be asserted for at least 100ms even after V above the reset threshold. The SM72240 has an active-low open-drain RESET output. The SM72240 is suitable for monitoring 5V. With a low supply current of only 6µA, the SM72240 is ideal for use in portable equipment. The SM72240 is available in the 5-pin SOT23 package. Typical Application Circuit © ...

  • Page 3

    ... MR pin goes high. May be left open. Supply Voltage (+5V, nominal) Supplied as 1000 Supplied as 3000 units, tape & reel units, tape & reel SM72240MF–4.63 SM72240MFX–4.63 SM72240MF–3.08 SM72240MFX–3. below the reset threshold voltage, CC Package Package NSC ...

  • Page 4

    ... Block Diagram SM72240 Block Diagram 3 30141435 www.national.com ...

  • Page 5

    ... RESET Output Leakage IN Current (SM72240) Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which the device operates correctly. Operating ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics. Note 2: The human body model is a 100pF capacitor discharged through a 1.5kΩ ...

  • Page 6

    Typical Performance Characteristics Supply Current vs V Reset Timeout vs V Normalized V vs Temperature TH Supply Current vs Temperature CC 30141403 Reset Timeout vs Temperature CC 30141404 30141416 5 30141407 30141408 V vs Current OL 30141405 www.national.com ...

  • Page 7

    Low V Characteristics CC Timing Diagram www.national.com 30141406 6 30141412 ...

  • Page 8

    ... V and MR. See the Applications Information section for de- CC tails. RESET THRESHOLD The SM72240 is available with a reset voltage of 4.63V or 3.08V which are suitable for monitoring 5.0V or 3.3V supplies respectively. 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 ...

  • Page 9

    ... NEGATIVE-GOING V TRANSIENTS CC The SM72240 is relatively immune to short negative-going transients or glitches Figure 2 CC pulse width a negative-going V transient can have without CC causing a reset pulse. In general, as the magnitude of the transient increases, going further below the threshold, the maximum allowable pulse width decreases. Typically transient that goes 125 mV below the reset threshold and lasts 40 µ ...

  • Page 10

    Physical Dimensions inches (millimeters) unless otherwise noted For Ordering, refer to Ordering Information table 5-Lead SOT23-5 NS Package Number MF05A 9 www.national.com ...

  • Page 11

    For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs ...

  • Page 12

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...