LM810M3-4.00 [ROCHESTER]
Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN;
| 型号： | LM810M3-4.00 |
| 厂家： | 
Rochester Electronics |
| 描述： | Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN 光电二极管 |
| 文件： | 总9页 (文件大小：865K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
September 2002
LM809/LM810
3-Pin Microprocessor Reset Circuits
General Description
Features
n Precise monitoring of 3V, 3.3V, and 5V supply voltages
n Superior upgrade to MAX809/810
The LM809/810 microprocessor supervisory circuits can be
used to monitor the power supplies in microprocessor and
digital systems. They provide a reset to the microprocessor
during power-up, power-down and brown-out conditions.
n Fully specified over temperature
n 140ms min. Power-On Reset pulse width, 240ms typical
Active-low RESET Output (LM809)
Active-high RESET Output (LM810)
n Guaranteed RESET Output valid for VCC≥1V
n Low Supply Current, 15µA typ.
The function of the LM809/810 is to monitor the VCC supply
voltage, and assert a reset signal whenever this voltage
declines below the factory-programmed reset threshold. The
reset signal remains asserted for 240ms after VCC rises
above the threshold. The LM809 has an active-low RESET
output, while the LM810 has an active-high RESET output.
n Power supply transient immunity
Seven standard reset voltage options are available, suitable
for monitoring 5V, 3.3V, and 3V supply voltages.
Applications
n Microprocessor Systems
n Computers
With a low supply current of only 15µA, the LM809/810 are
ideal for use in portable equipment. The LM809/LM810 are
available in the 3-pin SOT23 package and in the 6-Lead LLP
package.
n Controllers
n Intelligent Instruments
n Portable/Battery-Powered Equipment
n Automotive
Typical Application Circuit
10105701
Connection Diagrams
10105702
( ) are for LM810
10105715
Top View
See NS package Number LDB06A
( ) are for LM810
© 2002 National Semiconductor Corporation
DS101057
www.national.com
Ordering Information
Reset Threshold LM809 Supplied as 1000 LM809 Supplied as 3000
Package
Top Mark
S8B
Package
Type
(V)
units, tape & reel
LM809M3-4.63
LM809M3-4.38
LM809M3-4.00
LM809M3-3.08
LM809M3-2.93
LM809M3-2.63
LM809M3-2.45
units, tape & reel
LM809M3X-4.63
LM809M3X-4.38
LM809M3X-4.00
LM809M3X-3.08
LM809M3X-2.93
LM809M3X-2.63
LM809M3X-2.45
NSC Package
4.63
4.38
4.00
3.08
2.93
2.63
2.45
S7B
S6B
S5B
SOT23-3
M03B
S4B
S3B
SFB
Reset Threshold LM810 Supplied as 1000 LM810 Supplied as 3000
Package
Top Mark
SEB
Package
Type
(V)
units, tape & reel
LM810M3-4.63
LM810M3-4.38
LM810M3-4.00
LM810M3-3.08
LM810M3-2.93
LM810M3-2.63
units, tape & reel
LM810M3X-4.63
LM810M3X-4.38
LM810M3X-4.00
LM810M3X-3.08
LM810M3X-2.93
LM810M3X-2.63
NSC Package
4.63
4.38
4.00
3.08
2.93
2.63
SDB
SCB
SOT23-3
M03B
SBB
SAB
S9B
Reset Threshold LM809 Supplied as 1000 LM809 Supplied as 4500
Package
Top Mark
S13
Package
Type
(V)
units, tape & reel
units, tape & reel
NSC Package
2.63
LM809LD-2.63
LM809LDX-2.63
LLP-6
LDB06A
Custom voltages and improved accuracies are available, subject to minimum orders. Contact your local National Semiconductor Sales Office for information.
Pin Descriptions
PIN
NAME
GND
FUNCTION
(LLP)
SOT-23
1
1
Ground reference
Active-low output. RESET remains low while VCC is below the reset threshold,
and for 240ms after VCC rises above the reset threshold.
Active-high output. RESET remains high while VCC is below the reset
threshold, and for 240ms after VCC rises above the reset threshold.
Supply Voltage (+5V, +3.3V, or +3.0V)
RESET (LM809)
3
5
2
3
RESET (LM810)
VCC
www.national.com
2
Absolute Maximum Ratings (Note 1)
Continuous Power Dissipation
(Note 4)
320mW
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
θJA
:
LLP-6
152˚C/W
326˚C/W
VCC
−0.3V to 6.0V
−0.3V to (VCC+ 0.3V)
20mA
SOT23-3
RESET, RESET
Input Current, VCC Pin
Output Current, RESET, RESET
Pin
Ambient Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (soldering,
10sec)
−40˚C to +105˚C
125˚C
−65˚C to +160˚C
20mA
100V/µs
2kV
Rate of Rise, VCC
ESD Rating (Note 2)
+300˚C
Electrical Characteristics
VCC = full range, TA = −40˚C to +105˚C, unless otherwise noted. Typical values are at TA = +25˚C, VCC = 5V for
4.63/4.38/4.00 versions, VCC = 3.3V for 3.08/2.93 versions, and VCC = 3V for 2.63/2.45 version (Note 3).
Symbol
Parameter
Conditions
TA = 0˚C to +70˚C
TA = −40˚C to +105˚C
Min
1.0
1.2
Typ
Max
5.5
5.5
60
Units
VCC Range
V
<
TA = −40˚C to
+85˚C
VCC 5.5V, LM8_ _
18
15
-4.63/4.38/4.00
<
VCC 3.6V, LM8_ _
50
-3.08/2.93/2.63/2.45
ICC
Supply Current
µA
<
TA = +85˚C to
+105˚C
VCC 5.5V, LM8_ _
100
100
-4.63/4.38/4.00
<
VCC 3.6V, LM8_ _
-3.08/2.93/2.63/2.45
TA = +25˚C
4.56
4.50
4.40
4.31
4.25
4.16
3.93
3.89
3.80
3.04
3.00
2.92
2.89
2.85
2.78
2.59
2.55
2.50
2.41
2.38
2.33
4.63
4.38
4.00
3.08
2.93
2.63
2.45
4.70
4.75
4.86
4.45
4.50
4.56
4.06
4.10
4.20
3.11
3.15
3.23
2.96
3.00
3.08
2.66
2.70
2.76
2.49
2.52
2.57
LM8_ _ -4.63
LM8_ _ -4.38
LM8_ _ -4.00
LM8_ _ -3.08
LM8_ _ -2.93
LM8_ _ -2.63
LM8_ _ -2.45
TA = −40˚C to +85˚C
TA = +85˚C to +105˚C
TA = +25˚C
TA = −40˚C to +85˚C
TA = +85˚C to +105˚C
TA = +25˚C
TA = −40˚C to +85˚C
TA = +85˚C to +105˚C
TA = +25˚C
VTH
Reset Threshold (Note 5)
TA = −40˚C to +85˚C
TA = +85˚C to +105˚C
TA = +25˚C
V
TA = −40˚C to +85˚C
TA = +85˚C to +105˚C
TA = +25˚C
TA = −40˚C to +85˚C
TA = +85˚C to +105˚C
TA = +25˚C
TA = −40˚C to +85˚C
TA = +85˚C to +105˚C
Reset Threshold
30
ppm/˚C
µs
Temperature Coefficient
VCC to Reset Delay (Note 5) VCC = VTH to (VTH − 100mV)
20
TA = −40˚C to +85˚C
Reset Active Timeout Period
140
240
560
ms
TA = +85˚C to +105˚C
100
840
3
www.national.com
Electrical Characteristics (Continued)
VCC = full range, TA = −40˚C to +105˚C, unless otherwise noted. Typical values are at TA = +25˚C, VCC = 5V for
4.63/4.38/4.00 versions, VCC = 3.3V for 3.08/2.93 versions, and VCC = 3V for 2.63/2.45 version (Note 3).
Symbol
Parameter
Conditions
VCC = VTH min, ISINK = 1.2mA,
LM809-2.45/2.63/2.93/3.08
VCC = VTH min, ISINK = 3.2mA,
LM809-4.63/4.38/4.00
Min
Typ
Max
Units
0.3
RESET Output Voltage Low
(LM809)
VOL
0.4
0.3
V
>
VCC 1.0V, ISINK = 50µA
>
VCC VTH max, ISOURCE = 500µA,
0.8VCC
LM809-2.45/2.63/2.93/3.08
RESET Output Voltage High
(LM809)
VOH
V
>
VCC VTH max, ISOURCE = 800µA,
VCC−1.5
LM809-4.63/4.38/4.00
VCC = VTH max, ISINK = 1.2mA,
LM810-2.63/2.93/3.08
0.3
0.4
RESET Output Voltage Low
(LM810)
VOL
V
V
VCC = VTH max, ISINK = 3.2mA,
LM810-4.63/4.38/4.00
VOH
RESET Output Voltage High
(LM810)
0.8VCC
<
<
1.8V VCC VTH min, ISOURCE = 150µA
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which the device operates
correctly. Operating ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical
Characteristics.
Note 2: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
Note 3: Production testing done at T = +25˚C, over temperature limits guaranteed by design only.
A
Note 4: At elevated temperatures, devices must be derated based on package thermal resistance. The device in the SOT23-3 package must be derated at 4mW/˚C
at ambient temperatures above 70˚C. The device has internal thermal protection.
Note 5: RESET Output for LM809, RESET output for LM810.
www.national.com
4
Typical Performance Characteristics
Supply Current vs Temperature
(No Load, LM8_ _-2.63/2.93/3.08)
Power-Down Reset Delay vs Temperature
(LM8_ _-4.63/4.38)
10105703
10105706
Supply Current vs Temperature
(No Load, LM8_ _-4.63/4.38)
Power-Up Reset Timeout vs Temperature
10105707
10105704
Normalized Reset Threshold vs Temperature
Power-Down Reset Delay vs Temp
(LM8_ _-2.63/2.93/3.08)
10105708
10105705
5
www.national.com
Typically, for the 4.63V and 4.38V version of the LM809/810,
a VCC transient that goes 100mV below the reset threshold
and lasts 20µs or less will not cause a reset pulse. A 0.1 µF
bypass capacitor mounted as close as possible to the VCC
pin will provide additional transient rejection.
Applications Information
Benefits of Precision Reset Thresholds
A microprocessor supply supervisor must provide a reset
output within a predictable range of the supply voltage. A
common threshold range is between 5% and 10% below the
nominal supply voltage. The 4.63V and 3.08V options of the
LM809/810 use highly accurate circuitry to ensure that the
reset threshold occurs only within this range (for 5V and 3.3V
supplies). The other voltage options have the same tight
tolerance to ensure a reset signal for other narrow monitor
ranges. See Table 1 for examples of how the standard reset
thresholds apply to 3V, 3.3V, and 5V nominal supply volt-
ages.
TABLE 1. Reset Thresholds Related to Common
Supply Voltages
Reset
3.0V
3.3V
5.0V
Threshold
4.63 3%
4.38 3%
4.00 3%
3.08 3%
2.93 3%
2.63 3%
2.45 3%
90 - 95%
85 - 90%
78 - 82%
10105709
FIGURE 2. Maximum Transient Duration without
Causing a Reset Pulse vs. Reset Comparator
Overdrive
90 - 95%
86 - 90%
77 - 81%
72 - 76%
85 - 90%
79 - 84%
Interfacing to µPs with Bidirectional Reset Pins
Microprocessors with bidirectional reset pins, such as the
Motorola 68HC11 series, can be connected to the LM809
RESET output. To ensure a correct output on the LM809
even when the microprocessor reset pin is in the opposite
state, connect a 4.7kΩ resistor between the LM809 RESET
output and the µP reset pin, as shown in Figure 3. Buffer the
LM809 RESET output to other system components.
Ensuring a Valid Reset Output Down to VCC = 0V
When VCC falls below 1V, the LM809 RESET output no
longer sinks current. A high-impedance CMOS logic input
connected to RESET can therefore drift to undetermined
voltages. To prevent this situation, a 100kΩ resistor should
be connected from the RESET output to ground, as shown in
Figure 1.
A 100kΩ pull-up resistor to VCC is also recommended for the
<
LM810, if RESET is required to remain valid for VCC 1V.
10105711
10105710
FIGURE 3. Interfacing to Microprocessors with
Bidirectional Reset I/O
FIGURE 1. RESET Valid to VCC = Ground Circuit
Negative-Going VCC Transients
LLP Mounting
The LM809/810 are relatively immune to short
negative-going transients or glitches on VCC. Figure 2 shows
the maximum pulse width a negative-going VCC transient
can have without causing a reset pulse. In general, as the
magnitude of the transient increases, going further below the
threshold, the maximum allowable pulse width decreases.
The LLP package requires special mounting techniques
which are detailed in National Semiconductor Application
Note AN-1187. Referring to the section PCB Design Recom-
mendations, it should be noted that the pad style which
should be used with the LLP package is the NSMD (non-
solder mask defined) type.
www.national.com
6
Physical Dimensions inches (millimeters) unless otherwise noted
3-Lead SOT23-3
For Ordering, refer to Ordering Information table
NS Package Number M03B
6-Lead LLP (NLDBB006)
For Ordering, refer to Ordering Information table
NS Package Number LDB06A
7
www.national.com
Notes
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
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
labeling, can be reasonably expected to result in a
significant injury to the user.
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.
National Semiconductor
Corporation
Americas
National Semiconductor
Europe
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
Fax: +49 (0) 180-530 85 86
Email: support@nsc.com
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
Email: ap.support@nsc.com
www.national.com
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.
相关型号：
LM810M3-4.63/NOPB
IC 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3, SOT-23, 3 PIN, Power Management Circuit
NSC
©2020 ICPDF网 联系我们和版权申明