LM3710XQMMX-308 NSC [National Semiconductor], LM3710XQMMX-308 Datasheet

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LM3710XQMMX-308

Manufacturer Part Number
LM3710XQMMX-308
Description
Microprocessor Supervisory Circuits with Power Fail Input, Low Line Output, Manual Reset and Watchdog Timer
Manufacturer
NSC [National Semiconductor]
Datasheet

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© 2002 National Semiconductor Corporation
LM3710/LM3711
Microprocessor Supervisory Circuits with Power Fail
Input, Low Line Output, Manual Reset and Watchdog
Timer
General Description
The LM3710/LM3711 series of microprocessor supervisory
circuits provide the maximum flexibility for monitoring power
supplies and battery controlled functions in systems without
backup batteries. The LM3710/LM3711 series are available
in MSOP-10 and 9-bump micro SMD packages.
Built-in features include the following:
Reset: Reset is asserted during power-up, power-down, and
brownout conditions. RESET is guaranteed down to V
1.0V.
Manual Reset Input: An input that asserts reset when pulled
low.
Power-Fail Input: A 1.225V threshold detector for power fail
warning, or to monitor a power supply other than V
Low Line Output: This early power failure warning indicator
goes low when the supply voltage drops to a value which is
2% higher than the reset threshold voltage.
Watchdog Timer: The WDI (Watchdog Input) monitors one of
the µP’s output lines for activity. If no output transition occurs
during the watchdog timeout period, reset is activated.
Typical Application
DS200118
CC
.
CC
of
Features
n Standard Reset Threshold voltage: 3.08V
n Custom Reset Threshold voltages: For other voltages
n No external components required
n Manual-Reset input
n RESET (LM3710) or RESET (LM3711) outputs
n Precision supply voltage monitor
n Factory programmable Reset and Watchdog Timeout
n Separate Power Fail comparator
n Available in micro SMD package for minimum footprint
n
n
n Reset assertion down to 1V V
n 28 µA V
Applications
n Embedded Controllers and Processors
n Intelligent Instruments
n Automotive Systems
n Critical µP Power Monitoring
between 2.2V and 5.0V in 10mV increments, contact
National Semiconductor Corp.
Delays
extremes
±
±
0.5% Reset threshold accuracy at room temperature
2% Reset threshold accuracy over temperature
CC
supply current
CC
20011803
(RESET option only)
www.national.com
June 2002

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LM3710XQMMX-308 Summary of contents

Page 1

LM3710/LM3711 Microprocessor Supervisory Circuits with Power Fail Input, Low Line Output, Manual Reset and Watchdog Timer General Description The LM3710/LM3711 series of microprocessor supervisory circuits provide the maximum flexibility for monitoring power supplies and battery controlled functions in systems without ...

Page 2

Connection Diagram MSOP-10 Pin Descriptions Pin No. Name micro MSOP SMD RESET RESET C2 8 PFO C3 7 LLO B3 5 GND A3 4 WDI A2 3 PFI ...

Page 3

Block Diagram 3 20011805 www.national.com ...

Page 4

... Ordering Information * For other voltages between 2.2V and 5.0V, please contact National Semiconductor sales office. Part Number Output LM3710XQBP-308 totem-pole LM3710XQBPX-308 totem-pole LM3710XQMM-308 totem-pole LM3710XQMMX-308 totem-pole LM3711XQBP-308 totem-pole LM3711XQBPX-308 totem-pole LM3711XQMM-308 totem-pole LM3711XQMMX-308 totem-pole %% is the datecode and will vary with time. Table Of Functions ...

Page 5

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( All Other Inputs ESD Ratings (Note 2) Human Body Model Machine Model LM3710/LM3711 Series ...

Page 6

LM3710/LM3711 Series Electrical Characteristics Limits in the standard typeface are for T specified +2.2V to 5.5V. CC Symbol Parameter WDI WDI Watchdog Input Current WDI Watchdog Input T Threshold t Watchdog Watchdog Timeout Period = ...

Page 7

LM3710/LM3711 Series Electrical Characteristics Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For ...

Page 8

Typical Performance Characteristics Supply Current vs Supply Voltage Normalized Reset Threshold Voltage vs Temperature Reset Timeout Period vs Temperature www.national.com 3.3V Supply Current vs Temperature 20011815 Reset Timeout Period vs V 20011812 Max. Transient Duration vs Reset Comparator Overdrive 20011810 ...

Page 9

Typical Performance Characteristics Watchdog Timeout Period vs Temperature (t programmed as 6.2ms) WD Circuit Information Reset Output The Reset input of a µP initializes the device into a known state. The LM3710/LM3711 microprocessor supervisory cir- cuits assert a forced reset ...

Page 10

Circuit Information (Continued) experienced. This light could have an unpredictable affect on the electrical performance of the IC. Care should be taken to shield the device from direct exposure to bright visible or IR light during operation. Micro SMD Mounting ...

Page 11

Timing Diagrams FIGURE 1. LM3710/LM3711 Reset Time with MR and WDI FIGURE 2. LLO Output FIGURE 3. PFI Comparator Timing Diagram 11 20011828 20011829 20011830 www.national.com ...

Page 12

Typical Application Circuits FIGURE 4. Monitoring Two Critical Supplies And Dataline FIGURE 5. Monitoring Two Supplies plus Manual Reset And Dataline www.national.com 20011818 20011819 12 ...

Page 13

Typical Application Circuits FIGURE 6. Monitoring Dual Supplies plus External Fault Input And Dataline Note: MR input with its 1.225V nominal threshold, may monitor an additional supply voltage. An internal 56 kΩ pull-up resistor is included on this input. FIGURE ...

Page 14

Typical Application Circuits www.national.com (Continued) FIGURE 8. LM3710 Long Period oscillator 14 20011840 ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted 10 Lead MSOP Package NS Package Number MUB10A 15 www.national.com ...

Page 16

Physical Dimensions NOTES: UNLESS OTHERWISE SPECIFIED 1. EPOXY COATING 2. 63Sn/37Pb EUTECTIC BUMP 3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD. 4. PIN 1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE NUMBERED COUNTER CLOCKWISE. ...

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