LM3722, LM3723, LM3724
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SNVS154E – MAY 2001 – REVISED MARCH 2013
LM3722/LM3723/LM3724 5-Pin Microprocessor Reset Circuits
Check for Samples: LM3722, LM3723, LM3724
FEATURES
DESCRIPTION
•
The
LM3722/LM3723/LM3724
microprocessor
supervisory circuits monitor the power supplies in
microprocessor and digital systems. They provide a
reset to the microprocessor during power-up, powerdown, brown-out conditions, and manual reset.
1
2
•
•
•
•
•
•
Precise Monitoring of 2.5V, 3.3V, and 5V
Supply Voltages
Fully Specified Over Temperature
– Industrial: −40°C to +85°C
– Extended: −40°C to +125°C
100 ms Minimum Power-On Reset pulse Width,
190 ms Typical:
– Active-Low RESET Output (LM3722)
– Active-High RESET Output (LM3723)
– Active-Low RESET Open Drain Output
(LM3724)
Guaranteed RESET Output Valid for VCC ≥ 1V
Low Supply Current, 6µA Typical
Power Supply Transient Immunity
Compatible with MAX811/812 Applications
APPLICATIONS
•
•
•
•
•
The LM3722/LM3723/LM3724 asserts a reset signal
whenever the supply decreases below the factoryprogrammed reset threshold. Reset will be asserted
for at least 100ms even after VCC rises above the
reset threshold.
The LM3722 has an active-low RESET push-pull
output. The LM3723 has an active-high RESET pushpull output. The LM3724 has an active-low open-drain
RESET output.
Three standard reset voltage options are available,
suitable for monitoring 5V, 3.3V, and 2.5V supply
voltages. Additional reset voltages are also available;
contact Texas Instruments for details.
With a low supply current of only 6µA, the
LM3722/LM3723/LM3724 are ideal for use in portable
equipment. The LM3722/LM3723/LM3724 are
available in the 5-pin SOT-23 package.
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Portable/Battery-Powered Equipment
Typical Application Circuits
VCC
VCC
VCC
VCC
VCC
VCC
RL
LM3722
LM3723
MR
PUSHBUTTON
SWITCH
RESET
*(RESET)
PP
RESET
INPUT
GND
Figure 1. Typical Application Circuit
MR
GND
PP
LM3724
PUSHBUTTON
SWITCH
RESET
GND
RESET
INPUT
GND
Figure 2. Typical Application Circuit with RL
Connection
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2001–2013, Texas Instruments Incorporated
LM3722, LM3723, LM3724
SNVS154E – MAY 2001 – REVISED MARCH 2013
www.ti.com
Connection Diagram
5 VCC
GND 1
GND
2
LM3722
LM3723
LM3724
RESET
3
*(RESET)
4
MR
*( ) are for LM3723
Figure 3. SOT-23-5
PIN DESCRIPTIONS
PIN
NAME
1
GND
Ground reference
GND
Ground reference, device substrate, connect to ground.
2
3
FUNCTION
RESET
LM3722/LM3724
RESET
LM3723
Active-low output. RESET remains low while VCC is below the reset threshold voltage, and for 190
ms after VCC rises above the reset threshold voltage.
Active-high output. RESET remains high while VCC is below the reset threshold, and for 190 ms
after VCC rises above the reset threshold.
4
MR
Active-low input. Reset is asserted whenever this pin is pulled low and remains asserted for 190 ms
after the MR pin goes high. May be left open.
5
VCC
Supply Voltage (+5V, +3.3V, or +2.5V, nominal)
Block Diagram
VCC
OPEN for LM3724
CONNECT for
LM3722/LM3723
Reset Comparator
+
22k
Low Line
Comparator
RESET/
RESET
Reset Logic and
One-Shot Timer
Manual Reset
Comparator
+
MR
1.225V
Reference
Figure 4. LM3722/LM3723/LM3724 Block Diagram
2
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These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings
(1) (2)
−0.3V to 6.0V
VCC, MR
−0.3V to (VCC+ 0.3V)
RESET, RESET
Input Current, VCC Pin
20mA
Output Current, RESET, RESET Pin
20mA
ESD Rating
(3)
2kV
Continuous Power Dissipation (TA = +70°C)
SOT-23
(4)
320mW
Operating Temperature Range
Industrial:
−40°C to +85°C
Extended:
−40°C to +125°C
Maximum Junction Temperature
125°C
−65°C to +160°C
Storage Temperature Range
Lead Temperature (soldering, 10sec)
(1)
(2)
(3)
(4)
+300°C
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.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
At elevated temperatures, devices must be derated based on package thermal resistance. The device in the SOT-23-5 package must be
derated at 4.5mW/°C at ambient temperatures above 70°C. The device has internal thermal protection.
Electrical Characteristics
Typical values are at TA = +25°C. Limits with standard typeface are for TA = +25°C, and limits in boldface type apply for the
operating temperature range (−40°C to +85°C) for LM372_IM5X, and (−40°C to +125°C) for LM372_EM5X, unless otherwise
noted. (1)
Symbol
VCC
ICC
VTH
VTH
Tempco
Parameter
(2)
(3)
Min
Reset Threshold
VCC to Reset Delay
(2)
Max
V
µA
VCC = 5.5V
8
15
LM372 _ -3.08
VCC = 3.6V
7
10
LM372 _ -2.32
VCC = 2.5V
6
10
LM372 _ -4.63
4.54
4.50
4.63
4.72
4.75
LM372 _ -3.08
3.03
3.00
3.08
3.14
3.15
LM372 _ -2.32
2.27
2.25
2.32
2.37
2.40
VCC = VTH to (VTH − 100mV)
tRP
Reset Active Timeout Period
100
tMR
MR Minimum Pulse Width
10
tMD
MR to Reset Propagation Delay
(3)
Units
5.5
LM372 _ -4.63
Reset Threshold Temperature
Coefficient
tRD
Typ
1.0
Supply Current
(ILOAD = 0A)
MR Glitch Immunity
(1)
Conditions
VCC Range
V
30
ppm/°C
20
µs
190
560
ms
µs
2
µs
100
ns
Production testing done at TA = +25°C. Limits over the operating temperature range are guaranteed through correlation using Statistical
Quality Control (SQC) methods.
RESET Output for LM3722 and LM3724, RESET output for LM3723.
Glitches of 100 ns or less typically will not generate a reset pulse.
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Electrical Characteristics (continued)
Typical values are at TA = +25°C. Limits with standard typeface are for TA = +25°C, and limits in boldface type apply for the
operating temperature range (−40°C to +85°C) for LM372_IM5X, and (−40°C to +125°C) for LM372_EM5X, unless otherwise
noted. (1)
Symbol
Parameter
VIH
VIL
VIH
Conditions
Min
VCC > VTH(MAX), LM372_ -4.63
VCC > VTH(MAX), LM372_ -3.08, LM372_ -2.32
0.7 VCC
VOL
VOH
22
VCC = VTH min, ISINK = 1.2mA, (LM37222.32/3.08)
0.3
VCC = VTH min, ISINK = 3.2mA, (LM3722-4.63)
0.4
VCC > 1V, ISINK = 50µA
0.3
VCC > VTH max, ISOURCE = 500µA, (LM37222.32/3.08)
0.8VCC
VCC > VTH max, ISOURCE = 800µA, (LM3722-4.63)
VCC−1.5
V
V
VCC = VTH max, ISINK = 1.2mA
(LM3723 -2.32/3.08)
0.3
VCC = VTH max, ISINK = 3.2mA
(LM3723 -4.63)
0.4
RESET Output Voltage Low
(LM3723)
VOH
RESET Output Voltage High
(LM3723)
1.8V < VCC < VTH min, ISOURCE = 150µA
VOL
RESET Output Voltage Low
(LM3724)
VCC = VTH min, ISINK = 1.2 mA
(LM3724 -2.32/3.08)
0.3
VCC = VTH min, ISINK = 3.2 mA
(LM3724 -4.63)
0.4
VCC > 1V, ISINK = 50µA
0.3
0.8VCC
RESET Output Leakage Current
VCC > VTH, RESET = 5.5V
(LM3724)
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V
kΩ
VOL
IIN
4
RESET Output Voltage High
(LM3722)
Units
0.25 VCC
MR Pull-Up Resistance
RESET Output Voltage Low
(LM3722)
Max
0.8
MR Input Threshold
VIL
Typ
2.3
V
V
0.5
V
µA
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Typical Performance Characteristics
Supply Current
vs
VCC
Supply Current
vs
Temperature
10
9
VCC = 5.5V
8
SUPPLY CURRENT (PA)
7
ICC (PA)
6
5
4
3
2
8
6
VCC = 3.6V
4
VCC = 2.5V
2
1
0
-40
0
0
1
2
4
3
5
6
10
35
60
TEMPERATURE (oC)
Figure 5.
Figure 6.
Reset Timeout
vs
VCC
Reset Timeout
vs
Temperature
1.05
85
210
200
RESET TIMEOUT (ms)
NORMALIZED RESET TIMEOUT
-15
VCC (V)
1.025
1
0.975
190
180
170
160
150
-40
0.95
2
3
5
4
6
-20
0
20
40
60
80
TEMPERATURE (oC)
VCC (V)
Figure 7.
Figure 8.
Normalized VTH
vs
Temperature
LM3724 VOL
vs
Current
700
1.005
1.004
VCC = 2.5V
600
500
VCC = 3.3V
1.001
VOL (mV)
NORMALIZED VTH
1.003
1.002
1.000
0.999
400
VCC = 5V
300
200
0.998
0.997
100
0.996
0.995
-40
-20
40
0
20
60
TEMPERATURE (oC)
80
0
0.1
Figure 9.
0.3
3.0
1.0
SINK CURRENT
(mA)
10.0
Figure 10.
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Typical Performance Characteristics (continued)
LM3724 Low VCC Characteristics
700
RESET VOLTAGE (mV)
600
10 k: Pull-Up
Resistor
500
400
300
200
100
0
0.0
0.5
1.0
1.5
2.0
VCC (V)
Figure 11.
6
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Timing Diagram
Figure 12. Timing Diagram
Circuit Information
RESET OUTPUT
The reset input of a µP initializes the device into a known state. The LM3722/LM3723/LM3724 microprocessor
voltage monitoring circuits assert a forced reset output to prevent code execution errors during power-up, powerdown, and brownout conditions.
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 and the microprocessor initializes itself into
a known state. The LM3722 and LM3724 offer an active-low RESET; the LM3723 offers an active-high RESET.
As VCC drops below the reset threshold (such as during a brownout), the reset activates (see the NEGATIVEGOING VCC TRANSIENTS section). 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.
Additionally, the Manual Reset input (MR) will initiate a forced reset. See the MANUAL RESET INPUT (MR)
section.
The LM3722/LM3723/LM3724 reset outputs ignore short duration glitches on VCC and MR. See the Applications
Information section for details.
RESET THRESHOLD
The LM3722/LM3723/LM3724 are available with reset voltages of 4.63V, 3.08V, and 2.32V which are suitable for
monitoring 5.0V, 3.3V, and 2.5V supplies respectively. Other reset thresholds in the 2.20V to 5.0V range, in 10
mV steps, are available; contact Texas Instruments for details.
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MANUAL RESET INPUT (MR)
Many µP-based products require a manual reset capability, allowing the operator to initiate a reset. The MR input
is fully debounced and provides an internal 22 kΩ pull-up. When the MR input is pulled below VIL (0.25VCC) for
more than 100 ns, reset is asserted after a typical delay of 2 µs. Reset remains active as long as MR is held low,
and releases after MR rises above VIH and the reset timeout period expires. Use MR with digital logic to assert
reset or to daisy chain supervisory circuits.
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, 3.08V and
2.32V options of the LM3722/LM3723/LM3724 use highly accurate circuitry to ensure that the reset threshold
occurs only within this range (for 5.0V, 3.3V and 2.5V supplies). Table 1 shows how the standard reset
thresholds apply to 5.0V, 3.3V, and 2.5V nominal supply voltages.
Table 1. Monitored Tolerance Table
Supply Voltage
Reset Threshold
2.5V
3.3V
4.63 ± %
5.0V
90.8-94.4%
3.08 ± %
91.8-95.2%
2.32 ± %
90.8-94.8%
ENSURING A VALID RESET OUTPUT DOWN TO VCC = 0V
When VCC falls below 1V, the LM3722 RESET output is unable to sink the rated 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 13.
A 100kΩ pull-up resistor to VCC is also recommended for the LM3723, if RESET is required to remain valid for
VCC < 1V.
Figure 13. Circuit for RESET Valid from VCC = 0V
OPEN DRAIN OUTPUT (LM3724)
An open drain output allows easy paralleling of multiple microprocessor reset circuits without requiring additional
logic gates. Open drain outputs also allow interfacing devices of differing logic levels or families, since the output
pull-up resistor may be connected to any supply voltage up to 5.5V, regardless of LM3724 VCC.
The pull up resistor is calculated so that maximum current flow into RESET is less than 10 mA when activated.
The resistor must be small enough so that the leakage current of all connected devices does not create an
excessive voltage drop when the output is not activated. A resistor value of 100 kΩ will generally suffice.
8
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NEGATIVE-GOING VCC TRANSIENTS
The LM3722/LM3723/LM3724 are relatively immune to short negative-going transients or glitches on VCC.
Figure 14 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. Typically, a VCC transient that goes 125 mV below the reset threshold and lasts
40 µs 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.
600
Overdrive (mV)
500
400
300
200
100
0
0
20 40 60 80 100 120 140 160 180 200
Max Transient Duration (Ps)
Figure 14. Maximum Transient Duration without Causing a Reset Pulse vs. Reset Comparator Overdrive
INTERFACING TO µPS WITH BIDIRECTIONAL RESET PINS
Microprocessors with bidirectional reset pins, such as the Motorola 68HC11 series, can be connected to the
LM3722 RESET output. To ensure a correct output on the LM3722 even when the microprocessor reset pin is in
the opposite state, connect a 4.7kΩ resistor between the LM3722 RESET output and the µP reset pin, as shown
in Figure 15. Buffer the LM3722 RESET output to other system components.
Typical Application Circuits
Figure 15. Interfacing to Microprocessors with Bidirectional Reset I/O
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VIN
IN
VOUT
OUT
+
LM2941
SD
GND
24.9k
2.2PF
ADJ
7.15k
14.7k
11.5k
VOUT = 3.3V
VCC
VIN(TRIP) = 5.0V
LM3722
RESET
MR
OVERRIDE
5V
4V
VIN
3.3V
VOUT
tRP
RESET
Figure 16. Regulator/Switch with Long-Term Overvoltage Lockout Prevents Overdissipation in Linear
Regulator
3.3V
VCC
RESET
LM3722
MR
RESET
GND
tRP
tRP
tRP
Mechanical
Switch
MR
Figure 17. LM3722 Switch Debouncer
10
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MTP50P03HDL
VIN
VOUT
LOAD
C
VCC
RESET
R
LM3723
GND
VIN
VOUT
RESET
tRP
Figure 18. LM3723 Power-On Delay
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REVISION HISTORY
Changes from Revision D (March 2013) to Revision E
•
12
Page
Changed layout of National Data Sheet to TI format .......................................................................................................... 11
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PACKAGE OPTION ADDENDUM
www.ti.com
8-Oct-2015
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
LM3724EM5-3.08/NOPB
ACTIVE
SOT-23
DBV
5
1000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
R63B
LM3724EM5-4.63/NOPB
ACTIVE
SOT-23
DBV
5
1000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 125
R62B
LM3724IM5-2.32/NOPB
ACTIVE
SOT-23
DBV
5
1000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 85
R50B
LM3724IM5-3.08/NOPB
ACTIVE
SOT-23
DBV
5
1000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 85
R53B
LM3724IM5-4.63/NOPB
ACTIVE
SOT-23
DBV
5
1000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 85
R55B
LM3724IM5X-3.08/NOPB
ACTIVE
SOT-23
DBV
5
3000
Green (RoHS
& no Sb/Br)
CU SN
Level-1-260C-UNLIM
-40 to 85
R53B
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
8-Oct-2015
(6)
Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
20-Dec-2016
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
LM3724EM5-3.08/NOPB
SOT-23
DBV
5
1000
178.0
8.4
LM3724EM5-4.63/NOPB
SOT-23
DBV
5
1000
178.0
LM3724IM5-2.32/NOPB
SOT-23
DBV
5
1000
178.0
LM3724IM5-3.08/NOPB
SOT-23
DBV
5
1000
LM3724IM5-4.63/NOPB
SOT-23
DBV
5
LM3724IM5X-3.08/NOPB SOT-23
DBV
5
3.2
3.2
1.4
4.0
8.0
Q3
8.4
3.2
3.2
1.4
4.0
8.0
Q3
8.4
3.2
3.2
1.4
4.0
8.0
Q3
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
1000
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
3000
178.0
8.4
3.2
3.2
1.4
4.0
8.0
Q3
Pack Materials-Page 1
W
Pin1
(mm) Quadrant
PACKAGE MATERIALS INFORMATION
www.ti.com
20-Dec-2016
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
LM3724EM5-3.08/NOPB
SOT-23
DBV
5
1000
210.0
185.0
35.0
LM3724EM5-4.63/NOPB
SOT-23
DBV
5
1000
210.0
185.0
35.0
LM3724IM5-2.32/NOPB
SOT-23
DBV
5
1000
210.0
185.0
35.0
LM3724IM5-3.08/NOPB
SOT-23
DBV
5
1000
210.0
185.0
35.0
LM3724IM5-4.63/NOPB
SOT-23
DBV
5
1000
210.0
185.0
35.0
LM3724IM5X-3.08/NOPB
SOT-23
DBV
5
3000
210.0
185.0
35.0
Pack Materials-Page 2
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