MAX803_EXR/V+T [MAXIM]
3-Pin Microprocessor Reset Circuits;
| 型号： | MAX803_EXR/V+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 3-Pin Microprocessor Reset Circuits |
| 文件： | 总8页 (文件大小：870K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX803/MAX809/
MAX810
3-Pin Microprocessor Reset Circuits
General Description
Benefits and Features
● Precision Monitoring of +2.5V, +3V, +3.3V, and
+5V Power-Supply Voltages
The MAX803/MAX809/MAX810 are microprocessor (μP)
supervisory circuits used to monitor the power supplies
in μP and digital systems. They provide excellent circuit
reliability and low cost by eliminating external components
and adjustments when used with +5V, +3.3V, +3.0V, or
+2.5V powered circuits.
● Fully Specified Over Temperature
● Available in Three Output Configurations
• Open-Drain RESET Output (MAX803)
• Push-Pull RESET Output (MAX809)
• Push-Pull RESET Output (MAX810)
● 140ms (min) Power-On-Reset Pulse Width
● 12μA Supply Current
● Guaranteed Reset Valid to V
● Power Supply Transient Immunity
● No External Components
These circuits perform a single function: they assert a
reset signal whenever the V
below a preset threshold, keeping it asserted for at least
supply voltage declines
CC
= +1V
CC
140ms after V has risen above the reset threshold.
CC
Reset thresholds suitable for operation with a variety of
supply voltages are available.
● 3-Pin SC70 and SOT23 Packages
● AEC-Q100 Qualified. Refer to Ordering Information
The MAX803 has an open-drain output stage, while the
MAX809/MAX810 have push-pull outputs. The MAX803’s
open-drain RESET output requires a pullup resistor that
for Specific /V Versions.
Selector Guide and Ordering Information appear at end of data
sheet.
can be connected to a voltage higher than V . The
CC
MAX803/MAX809 have an active-low RESET output,
while the MAX810 has an active-high RESET output. The
reset comparator is designed to ignore fast transients on
V
, and the outputs are guaranteed to be in the correct
CC
Typical Operating Circuit
logic state for V
down to 1V.
CC
V
CC
Low supply current makes the MAX803/MAX809/MAX810
ideal for use in portable equipment. The MAX803 is
available in a 3-pin SC70 package, and the MAX809/
MAX810 are available in 3-pin SC70 or SOT23 packages.
V
V
CC
CC
R
*
PULLUP
MAX803
MAX809
µP
RESET
INPUT
RESET
Applications
● Computers
GND
GND
● Controllers
● Intelligent Instruments
● Critical μP and μC Power Monitoring
● Portable/Battery-Powered Equipment
● Automotive
*MAX803 ONLY
19-0344; Rev 11; 10/17
MAX803/MAX809/
MAX810
3-Pin Microprocessor Reset Circuits
Absolute Maximum Ratings
Terminal Voltage (with respect to GND)
Continuous Power Dissipation (T = +70°C)
A
V
...................................................................-0.3V to +6.0V
3-Pin SC70 (derate 2.17mW/°C above +70°C)...........174mW
3-Pin SOT23 (derate 4mW/°C above +70°C) .............320mW
Operating Temperature Range
3-Pin SC70 ................................................... -40°C to +125°C
3-Pin SOT23................................................. -40°C to +105°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
CC
RESET, RESET (push-pull).................. -0.3V to (V
+ 0.3V)
CC
RESET (open drain).........................................-0.3V to +6.0V
Input Current, V .............................................................20mA
CC
Output Current, RESET, RESET........................................20mA
Rate of Rise, V
..........................................................100V/μs
CC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(V
= full range, T = -40°C to +105°C (SOT23) or T = -40°C to +125°C (SC70), unless otherwise noted. Typical values are at T
=
CC
+25°C, V
A
A
A
= 5V for L/M/J versions, V
= 3.3V for T/S versions, V
CC
= 3V for R version, and V = 2.5V for Z version.) (Note 1)
CC
CC
CC
PARAMETER
Range
SYMBOL
CONDITIONS
= 0°C to +70°C
MIN
1.0
1.2
1.2
TYP
MAX UNITS
T
T
T
T
5.5
A
A
A
A
V
= -40°C to +105°C (MAX8_ _ _EUR)
= -40°C to +125°C (MAX8_ _ _EXR)
5.5
5.5
V
CC
V
V
V
V
V
V
V
V
< 5.5V, MAX8_ _L/M
< 3.6V, MAX8_ _R/S/T/Z
< 5.5V, MAX8_ _L/M
< 3.6V, MAX8_ _R/S/T/Z
< 5.5V, MAX8_ _L/M
< 3.6V, MAX8_ _R/S/T/Z
< 5.5V, MAX8_ _L/M
< 3.6V, MAX8_ _R/S/T/Z
24
60
= -40°C
to +85°C
CC
CC
CC
CC
CC
CC
CC
CC
17
50
Supply Current (SOT23)
Supply Current (SC70)
I
I
CC
100
100
35
T
= +85°C
to +105°C
A
µA
24
T
= -40°C
to +85°C
A
17
30
CC
60
T
= +85°C
to +125°C
A
60
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
= +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
4.63
4.38
4.00
3.08
2.93
2.63
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
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
MAX8_ _L
= -40°C to +85°C
= -40°C to +125°C
= +25°C
MAX8_ _M
= -40°C to +85°C
= -40°C to +125°C
= +25°C
MAX809J
(SOT only)
= -40°C to +85°C
= -40°C to +125°C
= +25°C
Reset Threshold
(SOT only)
V
V
TH
MAX8_ _T
MAX8_ _S
MAX8_ _R
= -40°C to +85°C
= -40°C to +125°C
= +25°C
= -40°C to +85°C
= -40°C to +125°C
= +25°C
= -40°C to +85°C
= -40°C to +125°C
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MAX803/MAX809/
MAX810
3-Pin Microprocessor Reset Circuits
Electrical Characteristics (continued)
(V
= full range, T = -40°C to +105°C (SOT23) or T = -40°C to +125°C (SC70), unless otherwise noted. Typical values are at T
=
CC
+25°C, V
A
A
A
= 5V for L/M/J versions, V
= 3.3V for T/S versions, V
CC
= 3V for R version, and V = 2.5V for Z version.) (Note 1)
CC
CC
CC
PARAMETER
SYMBOL
CONDITIONS
MIN
4.56
4.50
4.44
4.31
4.25
4.20
3.04
3.00
2.95
2.89
2.85
2.81
2.59
2.55
2.52
2.28
2.25
2.22
TYP
MAX UNITS
4.70
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
= +25°C
4.63
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
MAX8_ _L
MAX8_ _M
MAX8_ _T
MAX8_ _S
MAX8_ _R
= -40°C to +85°C
= -40°C to +125°C
= +25°C
4.75
4.82
4.38
3.08
2.93
2.63
2.32
4.45
= -40°C to +85°C
= -40°C to +125°C
= +25°C
4.50
4.56
3.11
= -40°C to +85°C
= -40°C to +125°C
= +25°C
3.15
3.21
V
Reset Threshold
(SC70 only)
V
TH
2.96
= -40°C to +85°C
= -40°C to +125°C
= +25°C
3.00
3.05
2.66
2.70
2.74
2.35
2.38
2.42
= -40°C to +85°C
= -40°C to +125°C
= +25°C
MAX8_ _Z
(SC70 only)
= -40°C to +85°C
= -40°C to +125°C
Reset Threshold Tempco
30
20
ppm/°C
V
to Reset Delay (Note 2)
V
T
= V to (V - 100mV)
µs
CC
CC
TH
TH
= -40°C to +85°C
= +85°C to +105°C
= -40°C to +85°C
= +85°C to +125°C
140
100
140
100
240
560
840
460
840
Reset Active Timeout Period
(SOT23)
A
ms
ms
T
A
T
A
T
A
240
Reset Active Timeout Period
(SC70)
V
= V (min), I
= 1.2mA,
CC
TH
SINK
0.3
RESET Output Voltage Low
(push-pull active low and open-
drain active low, MAX803 and
MAX809)
MAX803R/S/T/Z, MAX809R/S/T/Z
V
V
V
= V (min), I = 3.2mA,
OL
CC
TH
SINK
0.4
0.3
MAX803L/M, MAX809J/L/M
V
V
> 1.0V, I
= 50µA
CC
SINK
> V (max), I
= 500µA,
CC
TH
SOURCE
0.8V
CC
MAX803R/S/T/Z, MAX809R/S/T/Z
RESET Output Voltage High
(push-pull active low MAX809)
V
V
V
OH
V
> V (max), I = 800µA,
CC
TH
SOURCE
V
- 1.5
CC
MAX803L/M, MAX809J/L/M
V
= V (max), I
= 1.2mA,
CC
TH
SINK
0.3
0.4
MAX810R/S/T/Z
RESET Output Voltage Low
(push-pull active high, MAX810)
V
OL
V
= V (max), I
= 3.2mA,
CC
TH
SINK
MAX810L/M
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MAX803/MAX809/
MAX810
3-Pin Microprocessor Reset Circuits
Electrical Characteristics (continued)
(V
= full range, T = -40°C to +105°C (SOT23) or T = -40°C to +125°C (SC70), unless otherwise noted. Typical values are at T
=
CC
+25°C, V
A
A
A
= 5V for L/M/J versions, V
= 3.3V for T/S versions, V
CC
= 3V for R version, and V = 2.5V for Z version.) (Note 1)
CC
CC
CC
PARAMETER
SYMBOL
CONDITIONS
< V (min), I
MIN
0.8V
TYP
MAX UNITS
RESET Output Voltage High
(push-pull active high, MAX810)
V
1.8V < V
= 150µA
V
OH
CC
TH
SOURCE
CC
RESET Open-Drain Output
Leakage Current (MAX803)
(Note 3)
V
> V , RESET deasserted
1
µA
CC
TH
Note 1: Production testing done at T = +25°C; limits over temperature guaranteed by design only.
A
Note 2: RESET output for MAX803/MAX809; RESET output for MAX810.
Note 3: Guaranteed by design, not production tested.
Typical Operating Characteristics
(V
= full range, T = -40°C to +105°C, unless otherwise noted. Typical values are at T = +25°C, V
= +5V for L/M/J versions,
CC
CC
A
A
V
= +3.3V for T/S versions, V
= +3V for R version, and V
= +2.5V for Z version.)
CC
CC
CC
SUPPLY CURRENT vs. TEMPERATURE
(SC70 PACKAGE, NO LOAD)
POWER-DOWN RESET DELAY vs.
TEMPERATURE (MAX8_ _R/S/T/Z)
POWER-DOWN RESET DELAY vs.
TEMPERATURE (MAX8_ _J/L/M)
100
80
140
120
100
80
15
10
5
V
OD
= V - V
V
= V - V
TH
CC
OD TH CC
V
OD
= 10mV
MAX8_ _L/M, V = 5V
CC
V
OD
= 10mV
= 20mV
MAX8_ _R/S/T, V = 3.3V
CC
V
= 20mV
OD
60
V
OD
MAX8_ _Z, V = 2.5V
CC
60
40
40
20
0
V
= 100mV
V
= 100mV
20
0
OD
OD
MAX8_ _L/M/R/S/T/Z, V = 1V
CC
V
= 200mV
60
V
= 200mV
OD
OD
0
20
TEMPERATURE (°C)
85
20
TEMPERATURE (°C)
60
85
-20
-20
-40
-20
0
20
40
60
85
-40
0
40
-40
0
40
TEMPERATURE (°C)
POWER-UP RESET TIMEOUT
vs. TEMPERATURE
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
250
245
240
235
1.003
1.002
MAX8__J/L/M
1.001
1.000
0.999
0.998
0.997
MAX8__R/S/T/Z
230
225
20
TEMPERATURE (°C)
60
85
20
TEMPERATURE (°C)
60
85
-20
-20
-40
0
40
-40
0
40
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MAX803/MAX809/
MAX810
3-Pin Microprocessor Reset Circuits
to V , starting 0.5V above the actual reset threshold
and ending below it by the magnitude indicated (reset
comparator overdrive). The graph indicates the maximum
CC
Pin Configuration
TOP VIEW
pulse width a negative-going V
transient can have with-
CC
1
GND
out causing a reset pulse. As the magnitude of the transient
increases (goes farther below the reset threshold), the
maximum allowable pulse width decreases. Typically, for
MAX803
MAX809
MAX810
V
3
CC
the MAX8__L and MAX8__M, a V
transient that goes
CC
100mV below the reset threshold and lasts 20μs or less will
not cause a reset pulse. A 0.1μF bypass capacitor mounted
2
RESET (RESET)
as close as possible to the V
transient immunity.
pin provides additional
CC
SC70-3/SOT23-3
MAX803 AVAILABLE IN SC70-3 ONLY.
( ) ARE FOR MAX810.
Ensuring a Valid Reset Output Down to
= 0V
Pin Description
V
CC
When V
falls below 1V, the MAX809 RESET output no
PIN
NAME
FUNCTION
CC
longer sinks current—it becomes an open circuit.
1
GND
Ground
Therefore, high-impedance CMOS logic inputs connect-
ed to RESET can drift to undetermined voltages. This
presents no problem in most applications since most
RESET Output remains low while V
is below the reset threshold, and for at
CC
RESET
(MAX803/
MAX809)
least 140ms after V
rises above the
CC
μP and other circuitry is inoperative with V
below 1V.
reset threshold.
CC
2
However, in applications where RESET must be valid
down to 0V, adding a pull-down resistor to RESET causes
any stray leakage currents to flow to ground, holding
RESET low (Figure 2). R1’s value is not critical; 100kΩ is
large enough not to load RESET and small enough to pull
RESET to ground.
RESET Output remains high while V
is below the reset threshold, and for at
CC
RESET
(MAX810) least 140ms after V
rises above the
CC
reset threshold.
Supply Voltage (+5V, +3.3V, +3.0V, or
+2.5V)
3
V
CC
A 100kΩ pullup resistor to V
is also recommended for the
MAX810 if RESET is required to remain valid for V < 1V.
CC
CC
Detailed Description
Interfacing to μPs with Bidirectional Reset
A microprocessor’s (μP’s) reset input starts the μP in a
known state. The MAX803/MAX809/MAX810 assert reset
to prevent code-execution errors during power-up, power-
down, or brownout conditions. They assert a reset signal
Pins
Since the RESET output on the MAX803 is open
drain, this device interfaces easily with μPs that have
bidirectional reset pins, such as the Motorola 68HC11.
Connecting the μP supervisor’s RESET output directly to
the μC’s RESET pin with a single pullup resistor allows
either device to assert reset (Figure 3).
whenever the V
supply voltage declines below a preset
CC
threshold, keeping it asserted for at least 140ms after V
CC
has risen above the reset threshold. The MAX803 uses
an open-drain output, and the MAX809/MAX810 have a
push-pull output stage. Connect a pullup resistor on the
MAX803’s RESET output to any supply between 0 and 6V.
MAX803 Open-Drain RESET Output Allows
Use with Multiple Supplies
Generally, the pullup connected to the MAX803 will
connect to the supply voltage that is being monitored at the
Applications Information
IC’s V
pin. However, some systems may use the open-
Negative-Going V
Transients
CC
CC
drain output to level-shift from the monitored supply to reset
circuitry powered by some other supply (Figure 4). Note
In addition to issuing a reset to the μP during power-up,
power-down, and brownout conditions, the MAX803/
MAX809/MAX810 are relatively immune to short-duration
that as the MAX803’s V
decreases below 1V, so does
CC
the IC’s ability to sink current at RESET. Also, with any
decays toward
negative-going V
transients (glitches).
CC
pullup, RESET will be pulled high as V
CC
Figure 1 shows typical transient duration vs. reset
comparator overdrive, for which the MAX803/MAX809/
MAX810 do not generate a reset pulse. The graph
was generated using a negative-going pulse applied
0. The voltage where this occurs depends on the pullup
resistor value and the voltage to which it is connected.
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MAX803/MAX809/
MAX810
3-Pin Microprocessor Reset Circuits
When using ICs rated at only the nominal supply ±5%,
this leaves a zone of uncertainty where the supply is
between 5% and 10% low, and where the reset may or
may not be asserted.
Benefits of Highly Accurate Reset Threshold
Most μP supervisor ICs have reset-threshold voltages
between 5% and 10% below the value of nominal supply
voltages. This ensures a reset will not occur within 5% of
the nominal supply, but will occur when the supply is 10%
below nominal.
The MAX8_ _L/T/Z use highly accurate circuitry to ensure
that reset is asserted close to the 5% limit, and long
before the supply has declined to 10% below nominal.
400
V
CC
T
A
= +25°C
320
V
CC
V
CC
µP
240
160
80
MOTOROLA
68HCXX
MAX803
RESET
INPUT
RESET
MAX8_ _J/L/M
MAX8_ _R/S/T/Z
10
GND
GND
0
1
100
1000
RESET COMPARATOR OVERDRIVE, V - V (mV)
TH
CC
Figure 3. Interfacing to μPs with Bidirectional Reset I/O
Figure 1. Maximum Transient Duration Without Causing a
Reset Pulse vs. Reset Comparator Overdrive
+5.0V
+3.3V
V
CC
V
CC
V
CC
MAX809
R
PULLUP
RESET
5V SYSTEM
MAX803
RESET
INPUT
R1
100kΩ
RESET
GND
GND
GND
Figure 2. RESET Valid to V
= Ground Circuit
CC
Figure 4. MAX803 Open-Drain RESET Output Allows Use with
Multiple Supplies
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MAX803/MAX809/
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3-Pin Microprocessor Reset Circuits
Selector Guide
PART/SUFFIX
MAX803L
RESET THRESHOLD (V)
OUTPUT TYPE
Open-Drain RESET
Open-Drain RESET
Open-Drain RESET
Open-Drain RESET
Open-Drain RESET
Open-Drain RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
4.63
4.38
3.08
2.93
2.63
2.32
4.63
4.38
4.00
3.08
2.93
2.63
2.32
4.63
4.38
3.08
2.93
2.63
2.32
MAX803M
MAX803T
MAX803S
MAX803R
MAX803Z
MAX809L
MAX809M
MAX809J
MAX809T
MAX809S
MAX809R
MAX809Z
MAX810L
MAX810M
MAX810T
MAX810S
MAX810R
MAX810Z
Ordering Information
Chip Information
TRANSISTOR COUNT: 275 (SOT23)
PART
TEMP RANGE
PIN-PACKAGE
380 (SC70)
MAX803_EXR-T
MAX803_EXR+T
MAX803_EXR/V+
MAX803_EXR/V+T
MAX803LEXR/V+
MAX803MEXR/V+T
MAX803SEXR/V+T
MAX803TEXR/V+T
MAX809_EXR-T
MAX809_EXR+T
MAX809_EUR-T
MAX809_EUR+T
MAX810_EXR+T
MAX810_EUR+T
-40ºC to +125ºC 3 SC70
-40ºC to +125ºC 3 SC70
-40ºC to +125ºC 3 SC70
-40ºC to +125ºC 3 SC70
-40ºC to +125ºC 3 SC70
-40ºC to +125ºC 3 SC70
-40ºC to +125ºC 3 SC70
-40ºC to +125ºC 3 SC70
-40ºC to +125ºC 3 SC70
-40ºC to +125ºC 3 SC70
-40ºC to +105ºC 3 SOT23
-40ºC to +105ºC 3 SOT23
-40ºC to +125ºC 3 SC70
-40ºC to +105ºC 3 SOT23
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE TYPE
3 SC70
PACKAGE CODE DOCUMENT NO.
X3+2, X3-2
21-0075
21-0051
3 SOT23
U3+1, U3-1
Note: These parts are offered in 2.5k reels, and must be ordered
in 2.5k increments. Insert the desired suffix letter from the Selector
Guide into the blank to complete the part number. All versions of
these products may not be available at the time of announcement.
Contact factory for availability.
Some devices are available in both leaded and lead-free packaging.
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
T = Tape and reel.
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MAX803/MAX809/
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3-Pin Microprocessor Reset Circuits
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
12/94
Initial release.
—
Updated Ordering Information, added lead-free note, and added soldering temperature
in the Absolute Maximum Ratings
7
8
9
2/10
12/12
6/15
1, 2
1
Added MAX803_EXR/V+ to Ordering Information
Added MAX803_EXR/V+ to Ordering Information, moved Ordering Information, Pin
Configuration, and Selector Guide to end of data sheet, and rebranded data sheet
1–8
Added lead-free package code information and removed top mark information from
Selector Guide
10
11
12/15
7
Added AEC qualification statement to Benefits and Features section and updated
Ordering Information table
10/17
1, 7
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are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
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2017 Maxim Integrated Products, Inc.
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