LM3712XW1BP308 NSC [National Semiconductor], LM3712XW1BP308 Datasheet

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LM3712XW1BP308

Manufacturer Part Number
LM3712XW1BP308
Description
Microprocessor Supervisory Circuits with Separate Watchdog Timer Output, Power Fail Input and Manual Reset
Manufacturer
NSC [National Semiconductor]
Datasheet
1.LM3712XW1BP308.pdf (13 pages)
© 2002 National Semiconductor Corporation
LM3712/LM3713
Microprocessor Supervisory Circuits with Separate
Watchdog Timer Output, Power Fail Input and Manual
Reset
General Description
The LM3712/LM3713 series of microprocessor supervisory
circuits provide the maximum flexibility for monitoring power
supplies and battery controlled functions in systems without
backup batteries. The LM3712/LM3713 series are available
in a 9-bump micro SMD package.
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
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, the watchdog output
(WDO) pulls low.
Typical Application
DS200119
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 (LM3712) or RESET (LM3713) outputs
n Precision supply voltage monitor
n Factory programmable Reset and Watchdog Timeout
n Separate Watchdog output
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
20011903
(RESET option only)
www.national.com
July 2002

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LM3712XW1BP308 Summary of contents

Page 1

LM3712/LM3713 Microprocessor Supervisory Circuits with Separate Watchdog Timer Output, Power Fail Input and Manual Reset General Description The LM3712/LM3713 series of microprocessor supervisory circuits provide the maximum flexibility for monitoring power supplies and battery controlled functions in systems without backup ...

Page 2

Connection Diagram Pin Description Bump No. Name RESET RESET C2 PFO C3 WDO B3 GND A3 WDI A2 PFI B2 NC www.national.com Top View (looking from the coating side) micro SMD 9 Bump Package ...

Page 3

Block Diagram 3 20011905 www.national.com ...

Page 4

Ordering Information * For other voltages between 2.2V and 5.0V, please contact National Semiconductor sales office. Part Number LM3712XQBP-308 totem-pole LM3712XQBPX-308 totem-pole LM3713XQBP-308 totem-pole LM3713XQBPX-308 totem-pole %% is the datecode and will vary with time. Table Of Functions Part Active ...

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 LM3712/LM3713 Series ...

Page 6

LM3712/LM3713 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

LM3712/LM3713 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 20011915 Reset Timeout Period vs V 20011912 Max. Transient Duration vs Reset Comparator Overdrive 20011910 ...

Page 9

Typical Performance Characteristics Watchdog Timeout Period vs Temperature (t programmed as 6.2ms) WD (Continued) 20011913 9 www.national.com ...

Page 10

Circuit Information Reset Output The Reset input of a µP initializes the device into a known state. The LM3712/LM3713 microprocessor supervisory cir- cuits assert a forced reset output to prevent code execution errors during power-up, power-down, and brownout condi- tions. ...

Page 11

Timing Diagrams FIGURE 1. LM3712 Reset Time with MR FIGURE 2. PFI Comparator Timing Diagram 11 20011928 20011930 www.national.com ...

Page 12

Typical Application Circuits FIGURE 3. Monitoring Two Critical Supplies Plus Dataline FIGURE 4. Monitoring Two Supplies plus Manual Reset And Dataline www.national.com 20011918 20011919 12 ...

Page 13

Physical Dimensions unless otherwise noted 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 ...

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