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PDF LM8364BALMF20 Data sheet ( Hoja de datos )
| Número de pieza | LM8364BALMF20 | |
| Descripción | Micropower Undervoltage Sensing Circuits | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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March 2003
LM8364
Micropower Undervoltage Sensing Circuits
General Description
The LM8364 series are micropower undervoltage sensing
circuits that are ideal for use in battery powered micropro-
cessor based systems, where extended battery life is a key
requirement.
A range of threshold voltages from 2.0V to 4.5V are available
with an active low open drain output. These devices feature
a very low quiescent current of 0.65µA typical. The LM8364
series features a highly accurate voltage reference, a com-
parator with precise thresholds and built-in hysterisis to pre-
vent erratic reset operation, and guaranteed Reset operation
down to 1.0V with extremely low standby current.
These devices are available in the space saving SOT23
5-pin surface mount package. For other undervoltage
thresholds and output options, please contact National
Semiconductor.
Features
n Extremely Low Quiescent Current: 0.65µA, at VIN =
2.87V
n High Accuracy Threshold Voltage (±2.5%)
n Open Drain Output
n Input Voltage Range: 1V to 6V
n Surface Mount Package (5-Pin SOT23)
n Pin for pin compatible with MC33464
Applications
n Low Battery Detection
n Microprocessor reset Controller
n Power Fail Indicator
n Battery Backup Detection
Functional Block Diagram
Connection Diagram
5-Pin SOT23
20065907
Top View
20065906
© 2003 National Semiconductor Corporation DS200659
www.national.com
1 page  
Application Notes
The propagation delay time for the LM8364 is measured
using a 470kΩ pull-up resistor connected to from the RESET
output pin to 5V in addition to a 10pF capacitive load con-
nected from the same pin to GND. Figure 1 shows the timing
diagram for the measurement for the propagation delay.
VDET+ is equal to the sum of the detector threshold, VDET−,
and the built in hysteresis, VHYS.
FIGURE 1. Propagation Delay Timing Diagrams
20065909
The LM8364 ultra-low current voltage detector was designed
to monitor voltages and to provide an indication when the
monitored voltage, VIN, dropped below a precisely trimmed
threshold voltage. This characteristic is displayed in the typi-
cal operating timing diagram below. VIN is the voltage that is
being monitored and a pull up resistor is connected from the
RESET output pin to VIN. VIN is at some value above VDET+
and then begins to decrease. Since this is an Active Low
device the RESET output is pulled High through the pull-up
resistor and tracks VIN until VIN crosses the trimmed thresh-
old VDET−. At this point the LM8364 recognizes that VIN is
now in a fault condition and the output immediately changes
to the Logic Low State. The RESET output will remain in this
low state until VIN increases above the threshold VDET− +
VHYS. This point is also known as VDET+ as indicated earlier.
This built-in hysteresis has been added to the design to help
prevent erratic reset operation when the input voltage
crosses the threshold.
The LM8364 has a wide variety of applications that can take
advantage of its precision and low current consumption to
monitor Input voltages even though it was designed as a
reset controller in portable microprocessor based systems. It
is a very cost effective and space saving device that will
protect your more expensive investments of microproces-
sors and other devices that need a guaranteed supply volt-
age for proper operation.
FIGURE 2. Timing Waveforms
5
20065910
www.national.com
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