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PDF LM3705 Data sheet ( Hoja de datos )
| Número de pieza | LM3705 | |
| Descripción | Microprocessor Supervisory Circuits with Power Fail Input/ Low Line Output and Manual Reset | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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July 2002
LM3704/LM3705
Microprocessor Supervisory Circuits with Power Fail
Input, Low Line Output and Manual Reset
General Description
The LM3704/LM3705 series of microprocessor supervisory
circuits provide the maximum flexibility for monitoring power
supplies and battery controlled functions in systems without
backup batteries. The LM3704/LM3705 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 VCC of
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 VCC.
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
n Standard Reset Threshold voltage: 3.08V
n Custom Reset Threshold voltages: For other voltages
between 2.2V and 5.0V in 10mV increments, contact
National Semiconductor Corp.
n No external components required
n Manual-Reset input
n RESET (LM3704) or RESET (LM3705) outputs
n Precision supply voltage monitor
n Factory programmable Reset Timeout Delay
n Separate Power Fail comparator
n Available in micro SMD package for minimum footprint
n ±0.5% Reset threshold accuracy at room temperature
n ±2% Reset threshold accuracy over temperature
extremes
n Reset assertion down to 1V VCC (RESET option only)
n 28 µA VCC supply current
Applications
n Embedded Controllers and Processors
n Intelligent Instruments
n Automotive Systems
n Critical µP Power Monitoring
Typical Application
© 2002 National Semiconductor Corporation DS101369
10136903
www.national.com
1 page  
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)
All Other Inputs
ESD Ratings (Note 2)
Human Body Model
Machine Model
−0.3V to 6.0V
−0.3V to VCC + 0.3V
1.5kV
150V
Power Dissipation
(Note 3)
Operating Ratings (Note 1)
Temperature Range
−40˚C ≤ TJ ≤ 85˚C
LM3704/LM3705 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 LM3704
Range: VCC
LM3705
1.0 5.5
V
1.2 5.5
ICC VCC Supply
Current
All inputs = VCC; all outputs floating
28 50 µA
RESET THRESHOLD
VRST
VRSTH
Reset Threshold
Reset Threshold
Hysteresis
VCC falling
VCC falling: TA = 0˚C to 70˚C
−0.5
−2
−1.5
VRST
0.0032•VRST
+0.5
+2
+1.5
%
mV
tRP Reset Timeout
Period
Reset Timeout Period = A
Reset Timeout Period = B
Reset Timeout Period = C
1 1.4 2
20 28 40
ms
140 200 280
Reset Timeout Period = D
1120
1600
2240
tRD VCC to Reset
Delay
VCC falling at 1mV/µs
20 µs
RESET (LM3705)
VOL RESET
VOH
RESET
ILKG
Output Leakage
Current
VCC > 2.25V, ISINK = 900µA
VCC > 2.7V, ISINK = 1.2mA
VCC > 4.5V, ISINK = 3.2mA
VCC > 1.2V, ISOURCE = 50µA
VCC > 1.8V, ISOURCE = 150µA
VCC > 2.25V, ISOURCE = 300µA
VCC > 2.7V, ISOURCE = 500µA
VCC > 4.5V, ISOURCE = 800µA
VRESET = 5.5V
0.8 VCC
0.8 VCC
0.8 VCC
0.8 VCC
VCC − 1.5V
0.3
0.3 V
0.4
V
1.0 µA
RESET (LM3704)
VOL RESET
VOH
RESET
VCC > 1.0V, ISINK = 50µA
VCC > 1.2V, ISINK = 100µA
VCC > 2.25V, ISINK = 900µA
VCC > 2.7V, ISINK = 1.2mA
VCC > 4.5V, ISINK = 3.2mA
VCC > 2.25V, ISOURCE = 300µA
VCC > 2.7V, ISOURCE = 500µA
VCC > 4.5V, ISOURCE = 800µA
0.8 VCC
0.8 VCC
VCC − 1.5V
0.3
0.3
0.3
0.3
V
0.4
5 www.national.com
5 Page 
Typical Application Circuits
FIGURE 4. Monitoring Two Critical Supplies
10136918
FIGURE 5. Monitoring Two Supplies plus Manual Reset
10136919
11 www.national.com
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet LM3705.PDF ] | |
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