Datasheet LM8365BCLMFX30, LM8365BALMFX45, LM8365BALMFX22, LM8365BALMF45, LM8365BALMF22 Datasheet (NSC)

LM8365
Micropower Undervoltage Sensing Circuits with
Programmable Output Delay

LM8365 Micropower Undervoltage Sensing Circuits with Programmable Output Delay

March 2003

General Description

The LM8365 series are micropower undervoltage sensing
circuits that are ideal for use in battery powered micropro­cessor 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 or CMOS, output. These
devices feature a very low quiescent current of 0.65µA typi­cal. The LM8365 series features a highly accurate voltage
reference, a comparator with precise thresholds and built-in
hysterisis to prevent erratic reset operation, a time delayed
output which can be programmed by the system designer,
and guaranteed Reset operation down to 1.0V with ex­tremely low standby current.

These devices are available in the space saving 5-Pin
SOT23 surface mount package. For additional undervoltage
thresholds and output options, please contact National
Semiconductor.

Functional Diagrams

CMOS Output Open Drain Output

Features

n Extremely Low Quiescent Current: 0.65µA, at VIN=

2.87V

n High Accuracy Threshold Voltage (
n Complementary or Open Drain Output
n Programmable output delay by external Capacitor

(100ms typ with 0.1µF)

n Input Voltage Range: 1V to 6V
n Surface Mount Package (5-Pin SOT23)
n Pin for pin compatible with MC33465

±

2.5%)

Applications

n Low Battery Detection
n Microprocessor Reset Controller
n Power Fail Indicator
n Battery Backup Detection

20066013

20066014

Connection Diagram

5-Pin SOT23

Top View

© 2003 National Semiconductor Corporation DS200660 www.national.com

20066012

Pin Description

LM8365

Ordering Information

20066015

Package Part Number Package

Marking

5-Pin

SOT23

LM8365BALMF22

LM8365BALMFX22 3k Units Tape and Reel

LM8365BALMF27

LM8365BALMFX27 3k Units Tape and Reel

LM8365BCLMF30

LM8365BCLMFX30 3k Units Tape and Reel

LM8365BALMF45

LM8365BALMFX45 3k Units Tape and Reel

F08A 2.2V

F07A 2.7V

F02A 3.0V

F06A 4.5V

Threshold Output Type Transport Media NSC Drawing

Open Drain,

Active Low

Open Drain,

Active Low

CMOS, Active

Low

Open Drain,

Active Low

1k Units Tape and Reel

1k Units Tape and Reel

1k Units Tape and Reel

1k Units Tape and Reel

MF05A

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LM8365

Absolute Maximum Ratings (Note 1)

Junction Temperature 125˚C

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Supply Voltage −0.3V to 6.5V

RESET Output Voltage

RESET Output Current

−0.3V to 6.5V

70mA

Storage Temperature Range −65˚C to 150˚C

Mounting Temperature

Operating Ratings (Note 1)

Temperature Range −40˚C to 85˚C

Thermal Resistance to Ambient (θ

ESD Tolerance

Human Body Model 2000V

Machine Model 200V

) 265˚C/W

JA

Lead Temp. (Soldering 10 sec) 260˚C

Electrical Characteristics

Unless otherwise specified, all limits guaranteed for TA= 25˚C.

Symbol Parameter Conditions Min

(Note 3)

High to Low State Output

Decreasing)

(V

IN

V

DET−

Detector Threshold Voltage

22 Suffix 2.145 2.2 2.255

27 Suffix 2.633 2.7 2.767

30 Suffix 2.925 3.0 3.075

45 Suffix 4.388 4.5 4.613

V

Increasing

IN

22 Suffix 0.066 0.110 0.154

V

HYS

Detector Threshold Hysteresis

27 Suffix 0.081 0.135 0.189

30 Suffix 0.090 0.150 0.210

45 Suffix 0.135 0.225 0.315

∆Vdet/∆T Detector Threshold Voltage

Temperature Coefficient

V

OH

V

OL

I

OL

I

OH

I

CD

R

D

V

IN

RESET Output Voltage (CMOS Output: I

SOURCE

= 1mA)

-2.1 VIN-1.0

V

IN

(Open Drain or CMOS Output:

= 1mA)

I

SINK

RESET Output Sink Current VIN= 1.5V, VOL= 0.5V 1.0 2.5 mA

RESET Output Source Current VIN= 4.5V, VOL= 2.4V 1.0 7.0 mA

Delay Pin Output Sink Current VIN= 1.5V, VCD= 0.5V 0.2 1.8 mA

Delay Resistance 0.5 1.0 2.0 MΩ

Operating Input Voltage Range 1.0 6.0 V

22 Suffix

= 2.10V 0.57 0.8

V

IN

V

= 4.20V 0.71 1.3

IN

27 Suffix

V

= 2.60V 0.62 0.9

IN

V

= 4.70V 0.75 1.3

I

IN

Quiescent Input Current

IN

30 Suffix

V

= 2.87V 0.65 0.9

IN

V

= 5.00V 0.77 1.3

IN

45 Suffix

V

= 4.34V 0.70 1.0

IN

V

= 6.00V 0.85 1.4

IN

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 specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.

Note 2: Typical values represent the most likely parametric norm.

Note 3: All limits are guaranteed by testing or statistical analysis.

Typ

(Note 2)

±

100 PPM/˚C

0.25

Max

(Note 3)

V

IN

0.5 V

Units

V

V

µA

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Typical Performance Characteristics

LM8365

Input Current vs. Input Voltage

LM8365BALMF45

Reset Output Sink Current vs. Input Voltage

LM8365BALMF27

Reset Output Voltage vs. Input Voltage

LM8365BALMF45

20066001 20066002

Reset Output Source Current vs. Input Voltage

LM8365BCLMF30

20066003 20066004

Reset Output Sink Current vs. Reset Output Voltage

LM8365BALMF45

20066005

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C

Sink Current vs. Input Voltage

D

LM8365BALMF27

20066006

Typical Performance Characteristics (Continued)

C

C

Sink Current vs. CDVoltage

D

D

LM8365

Delay Pin Threshold Voltage vs. Temperature

LM8365BALMF27

20066007

Detector Threshold Voltage vs. Temperature

LM8365BALMF45 Delay Resistance vs. Temperature

20066009

Output Time Delay vs. Capacitance

20066008

20066010

20066011

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Application Notes

The propagation delay time for the LM8365 is measured

LM8365

using a 470kΩ pull-up resistor connected to from the RESET
output pin to 5V in addition to a 10pF capacitive load con­nected from the same pin to GND. Figure 1 shows the timing

diagram for the measurement for the propagation delay.

is equal to the sum of the detector threshold, V

V

DET+

and the built in hysteresis, V
from High-to-Low and t

HYS.tD1

D2

is the propagation time

is the propagation from

DET−

Low-to-High.

,

FIGURE 1. Propagation Delay Timing Diagrams

The LM8365 ultra-low current voltage detector was designed
to monitor voltages and to provide an indication when the
monitored voltage, V

, dropped below a precisely trimmed

IN

threshold voltage. The voltage detector of the LM8365 drives
a time delay generator that may be programmed for fixed
lengths of time depending on the application needs. This
characteristic is displayed in the typical operating timing
diagram in Figure 2.V

is the voltage that is being moni-

IN

tored and as it decreases passed the precisely trimmed
threshold V

the Active Low RESET output drops to a

DET−

Logic Low state and the CDpin drops to 0V. During this state
the external capacitor connected to the C

pin is immedi-

D

ately discharged by an internal N-Channel MOSFET. When

increases above the threshold V

V

IN

capacitor connected to the C

DET+(VDET−+VHYS

pin starts to charge up to V

D

) the

20066016

through an internal pull-up resistor RD. Once the capacitor
has charged up past the internal Delay Pin Threshold, which
is typically 0.675 V

, the RESET output will revert back to

IN

it’s original state. The LM8365 has built-in hysteresis to help
prevent erratic reset operation when the input voltage
crosses the threshold.

The LM8365 has a wide variety of applications that can take
advantage of it’s 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 microproces­sors and other devices that need a guaranteed supply volt­age and time delay for proper operation.

IN

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Application Notes (Continued)

LM8365

FIGURE 2. Timing Waveforms

20066017

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Typical Applications

LM8365

Microprocessor Reset Circuit

Battery Charge Indicator Using LM8365BCLMF30

20066018

20066019

Missing Pulse Detector or Frequency Detector Using LM8365BALMF45

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20066020

Physical Dimensions inches (millimeters)

unless otherwise noted

LM8365 Micropower Undervoltage Sensing Circuits with Programmable Output Delay

5-Pin SOT23-5

NSC Package Number MF05A

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COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the

2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.

labeling, can be reasonably expected to result in a
significant injury to the user.

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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.