LM3700,LM3701
LM3700/LM3701 Microprocessor Supervisory Circuit with Low Line Output
Literature Number: SNVS146D
LM3700/LM3701
OBSOLETE
September 24, 2011
Microprocessor Supervisory Circuit with Low Line Output
General Description
The LM3700/LM3701 series of microprocessor supervisory
circuits provide the maximum flexibility for monitoring power
supplies and battery controlled functions in systems without
backup batteries. The LM3700/LM3701 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 VCC of
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.
Features
■Standard Reset Threshold voltage: 3.08V
■Custom Reset Threshold voltages: For other voltages
between 2.2V and 5.0V in 10mV increments, contact
National Semiconductor Corp.
■No external components required
■RESET (LM3700) or RESET (LM3701) outputs
■Precision supply voltage monitor
■Factory programmable Reset Timeout Delay
■Available in micro SMD package for minimum footprint
■±0.5% Reset threshold accuracy at room temperature
■±2% Reset threshold accuracy over temperature
extremes
■Reset assertion down to 1V VCC (RESET option only)
■28 µA VCC supply current
Applications
■Embedded Controllers and Processors
■Intelligent Instruments
■Automotive Systems
■Critical µP Power Monitoring
Typical Application
20011403
© 2011 National Semiconductor Corporation 200114 www.national.com
200114 Version 5 Revision 3 Print Date/Time: 2011/09/24 07:37:25
LM3700/LM3701 Microprocessor Supervisory Circuit with Low Line Output
Connection Diagram
Top View
(looking from the coating side)
micro SMD 9 Bump Package
BPA09
20011401
Pin Descriptions
Bump No. Name Function
B1 VCC Power Supply input.
C1 RESET Reset Logic Output. Pulses low for tRP (Reset Timeout Period) when triggered, and stays low whenever
VCC is below the reset threshold or when MR is below VMRT. It remains low for tRP after either VCC
rises above the reset threshold, or after MR input rises above VMRT (LM3700 only).
RESET Reset Logic Output. RESET is the inverse of RESET (LM3701 only).
C3 LLO Low-Line Logic Output. Early Power-Fail warning output. Low when VCC falls below VLLOT (Low-Line
Output Threshold). This output can be used to generate an NMI (Non-Maskable Interrupt) to provide
an early warning of imminent power-failure.
B3 GND Ground reference for all signals.
A1, A2, A3,
C2
NC No Connect.
B2 NC No Connect. Test input used at factory only. Leave floating.
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LM3700/LM3701
Block Diagram
20011405
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LM3700/LM3701
Ordering Information
20011404
*For other voltages between 2.2V and 5.0V, please contact National Semiconductor sales office.
LM3700/LM3701
Part Number Output Reset Timeout Period Package Marking
LM3700XBBP-270 totem-pole 28ms %%IE
LM3700XBBPX-270 totem-pole 28ms %%IE
LM3700XCBP-290 totem-pole 200ms %%123
LM3700XCBPX-290 totem-pole 200ms %%123
LM3700XCBP-308 totem-pole 200ms %%I0
LM3700XCBPX-308 totem-pole 200ms %%I0
LM3701XCBP-308 totem-pole 200ms %%I1
LM3701XCBPX-308 totem-pole 200ms %%I1
LM3700XBBP-420 totem-pole 28ms %%IF
LM3700XBBPX-420 totem-pole 28ms %%IF
%% is the datecode and will vary with time.
Table Of Functions
Part Number Active Low
Reset
Active High
Reset
Output
(X = totem-pole)
(Y = open-drain)
Reset Timeout Period Low Line Output
LM3700 x X, Y* Customized x
LM3701 x X Customized x
* = available upon request. Contact National
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LM3700/LM3701
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VCC) −0.3V to 6.0V
All Other Inputs −0.3V to VCC + 0.3V
ESD Ratings (Note 2)
Human Body Model
Machine Model
1.5kV
150V
Power Dissipation (Note 3)
Operating Ratings (Note 1)
Temperature Range −40°C ≤ TJ ≤ 85°C
LM3700/LM3701 Series Electrical Characteristics
Limits in the standard typeface are for TJ = 25°C and limits in boldface type apply over full operating range. Unless otherwise
specified: VCC = +2.2V to 5.5V.
Symbol Parameter Conditions Min Typ Max Units
POWER SUPPLY
VCC Operating Voltage
Range: VCC
LM3700 1.0 5.5 V
LM3701 1.2 5.5
ICC VCC Supply Current All inputs = VCC; all outputs floating 28 50 µA
RESET THRESHOLD
VRST Reset Threshold VCC falling −0.5
−2 VRST
+0.5
+2 %
VCC falling: TA = 0°C to 70°C −1.5 +1.5
VRSTH Reset Threshold
Hysteresis
0.0032•VRST mV
tRP Reset Timeout
Period
Reset Timeout Period = A
Reset Timeout Period = B
Reset Timeout Period = C
Reset Timeout Period = D
1
20
140
1120
1.4
28
200
1600
2
40
280
2240
ms
tRD VCCto Reset Delay VCC falling at 1mV/µs 20 µs
RESET (LM3701)
VOL RESET VCC > 2.25V, ISINK = 900µA 0.3
V
VCC > 2.7V, ISINK = 1.2mA 0.3
VCC > 4.5V, ISINK = 3.2mA 0.4
VOH RESET VCC > 1.2V, ISOURCE = 50µA 0.8 VCC
V
VCC > 1.8V, ISOURCE = 150µA 0.8 VCC
VCC > 2.25V, ISOURCE = 300µA 0.8 VCC
VCC > 2.7V, ISOURCE = 500µA 0.8 VCC
VCC > 4.5V, ISOURCE = 800µA VCC − 1.5V
ILKG Output Leakage
Current
VRESET = 5.5V 1.0 µA
RESET (LM3700)
VOL RESET VCC > 1.0V, ISINK = 50µA 0.3
V
VCC > 1.2V, ISINK = 100µA 0.3
VCC > 2.25V, ISINK = 900µA 0.3
VCC > 2.7V, ISINK = 1.2mA 0.3
VCC > 4.5V, ISINK = 3.2mA 0.4
VOH RESET VCC > 2.25V, ISOURCE = 300µA 0.8 VCC
VCC > 2.7V, ISOURCE = 500µA 0.8 VCC
VCC > 4.5V, ISOURCE = 800µA VCC − 1.5V
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LM3700/LM3701
Symbol Parameter Conditions Min Typ Max Units
LLO
VOL LLO Output Voltage VCC > 2.25V, ISINK = 900µA 0.3
V
VCC > 2.7V, ISINK = 1.2mA 0.3
VCC > 4.5V, ISINK = 3.2mA 0.4
VOH VCC > 2.25V, ISOURCE = 300µA 0.8 VCC
VCC > 2.7V, ISOURCE = 500µA 0.8 VCC
VCC > 4.5V, ISOURCE = 800µA VCC − 1.5V
LLO OUTPUT
VLLOT LLO Output
Threshold
(VLLO − VRST, VCC
falling)
1.01•VRST 1.02•VRST 1.03•VRST V
VLLOTH Low-Line
Comparator
Hysteresis
0.0032•VRST mV
tCD Low-Line
Comparator Delay
VCC falling at 1mV/µs 20 µs
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 guaranteed specifications and test conditions, see the Electrical Characteristics.
The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under
the listed conditions.
Note 2: The Human Body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200pF capacitor discharged
directly into each pin.
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJ-
A, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperture is calculated using:
Where the value of θJ-A for the micro SMD package is 220°C/W.
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LM3700/LM3701
Typical Performance Characteristics
Supply Current vs Supply Voltage
20011415
3.3V Supply Current vs Temperature
20011411
Normalized Reset Threshold Voltage vs Temperature
20011412
Reset Timeout Period vs VCC
20011432
Reset Timeout Period vs Temperature
20011410
Max. Transient Duration vs Reset Comparator Overdrive
(VCC = 3.3V)
20011416
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LM3700/LM3701
Low-Line Comparator Propagation Delay vs Temperature
20011414
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LM3700/LM3701
Circuit Information
RESET OUTPUT
The Reset input of a µP initializes the device into a known
state. The LM3700/LM3701 microprocessor supervisory cir-
cuits assert a forced reset output to prevent code execution
errors during power-up, power-down, and brownout condi-
tions.
RESET is guaranteed valid for VCC > 1V. Once VCC exceeds
the reset threshold, an internal timer maintains the output for
the reset timeout period. After this interval, reset goes high.
The LM3700 offers an active-low RESET; The LM3701 offers
an active-high RESET.
Any time VCC drops below the reset threshold (such as during
a brownout), the reset activates. When VCC again rises above
the reset threshold, the internal timer starts. Reset holds until
VCC exceeds the reset threshold for longer than the reset
timeout period. After this time, reset releases.
RESET THRESHOLD
The LM3700/LM3701 family is available with a reset voltage
of 3.08V. Other reset thresholds in the 2.20V to 5.0V range,
in steps of 10 mV, are available; contact National Semicon-
ductor for details.
LOW-LINE OUTPUT (LLO)
The low-line output comparator is typically used to provide a
non-maskable interrupt to a µP when VCC begins falling.
LLO monitors VCC and goes low when VCC falls below VLLOT
(typically 1.02 • VRST) with hysteresis of 0.0032 • VRST.
SPECIAL PRECAUTIONS FOR THE MICRO SMD
PACKAGE
As with most integrated circuits, the LM3700 and LM3701 are
sensitive to exposure from visible and infrared (IR) light radi-
ation. Unlike a plastic encapsulated IC, the micro SMD pack-
age has very limited shielding from light, and some sensitivity
to light reflected from the surface of the PC board or long
wavelength IR entering the die from the side may be experi-
enced. 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
The micro SMD package requires specific mounting tech-
niques which are detailed in National Semiconductor Appli-
cation Note AN-1112. Referring to the section Surface Mount
Technology (SMT) Assembly Considerations, it should be
noted that the pad style which must be used with the 9-pin
package is the NSMD (non-solder mask defined) type.
For best results during assembly, alignment ordinals on the
PC board may be used to facilitate placement of the micro
SMD device.
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200114 Version 5 Revision 3 Print Date/Time: 2011/09/24 07:37:25
LM3700/LM3701
Timing Diagrams
20011428
FIGURE 1. LM3700 Reset Time
20011429
FIGURE 2. LLO Output
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LM3700/LM3701
Typical Application Circuits
20011424
FIGURE 3. LM3701 Power-On Delay
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LM3700/LM3701
20011422
FIGURE 4. Regulator/Switch with Long-Term Overvoltage Lockout Prevents Overdissipation in Linear Regulator
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LM3700/LM3701
Physical Dimensions inches (millimeters) 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 NUMBERED COUNTER CLOCK-
WISE.
5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS PACK-
AGE HEIGHT.
6.NO JEDEC REGISTRATION AS OF AUG.1999.
9 bump micro SMD Package
NS Package Number BPA09FFB
The dimensions of X1, X2 and X3 are given below
X1 = 1.412mm
X2 = 1.412mm
X3 = 0.850mm
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200114 Version 5 Revision 3 Print Date/Time: 2011/09/24 07:37:25
LM3700/LM3701
Notes
LM3700/LM3701 Microprocessor Supervisory Circuit with Low Line Output
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