LM3706XQBPX-308 NSC [National Semiconductor], LM3706XQBPX-308 Datasheet

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LM3706XQBPX-308

Manufacturer Part Number
LM3706XQBPX-308
Description
Microprocessor Supervisory Circuits with Low Line Output and Watchdog Timer
Manufacturer
NSC [National Semiconductor]
Datasheet
1.LM3706XQBPX-308.pdf (11 pages)
© 2002 National Semiconductor Corporation
LM3706/LM3707
Microprocessor Supervisory Circuits with Low Line
Output and Watchdog Timer
General Description
The LM3706/LM3707 series of microprocessor supervisory
circuits provide the maximum flexibility for monitoring power
supplies and battery controlled functions in systems without
backup batteries. The LM3706/LM3707 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.
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.
Features
n Standard Reset Threshold voltage: 3.08V
n Custom Reset Threshold voltages: For other voltages
Typical Application
between 2.2V and 5.0V in 10mV increments, contact
National Semiconductor Corp.
DS200116
CC
of
n No external components required
n RESET (LM3706) or RESET (LM3707) outputs
n Precision supply voltage monitor
n Factory programmable Reset and Watchdog Timeout
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
Delays
extremes
±
±
0.5% Reset threshold accuracy at room temperature
2% Reset threshold accuracy over temperature
CC
supply current
CC
20011603
(RESET option only)
www.national.com
June 2002

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LM3706XQBPX-308 Summary of contents

Page 1

LM3706/LM3707 Microprocessor Supervisory Circuits with Low Line Output and Watchdog Timer General Description The LM3706/LM3707 series of microprocessor supervisory circuits provide the maximum flexibility for monitoring power supplies and battery controlled functions in systems without backup batteries. The LM3706/LM3707 series ...

Page 2

Connection Diagram Pin Descriptions Bump No. Name RESET RESET C3 LLO B3 GND A3 WDI A1, A2 www.national.com Top View (looking from the coating side) micro SMD 9 Bump Package BPA09 20011601 ...

Page 3

Block Diagram 3 20011605 www.national.com ...

Page 4

... Ordering Information * For other voltages between 2.2V and 5.0V, please contact National Semiconductor sales office. LM3706/LM3707 Part Number LM3706XQBP-308 totem-pole LM3706XQBPX-308 totem-pole LM3707XQBP-308 totem-pole LM3707XQBPX-308 totem-pole %% is the datecode and will vary with time. Table Of Functions Part Active Active Number Low Reset LM3706 x LM3707 * = available upon request ...

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 LM3706/LM3707 Series ...

Page 6

LM3706/LM3707 Series Electrical Characteristics Limits in the standard typeface are for T specified +2.2V to 5.5V. CC Symbol Parameter WDI Watchdog Input Current WDI Watchdog Input T Threshold t Watchdog Watchdog Timeout Period = ...

Page 7

Typical Performance Characteristics Supply Current vs Supply Voltage Normalized Reset Threshold Voltage vs Temperature Reset Timeout Period vs Temperature 3.3V Supply Current vs Temperature 20011615 Reset Timeout Period vs V 20011612 Max. Transient Duration vs Reset Comparator Overdrive 20011610 7 ...

Page 8

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 LM3706/LM3707 microprocessor supervisory cir- cuits assert a forced reset ...

Page 9

Timing Diagrams FIGURE 1. LM3706 Reset Time with WDI FIGURE 2. LLO Output 9 20011628 20011629 www.national.com ...

Page 10

Typical Application Circuits www.national.com FIGURE 3. LM3706 Long Delay Timer/Oscillator 10 20011640 ...

Page 11

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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