MAX6800/MAX6801/
MAX6802
General Description
The MAX6800/MAX6801/MAX6802 microprocessor (μP)
supervisory circuits monitor the power supplies in 2.85V to
5.0V μP and digital systems. They increase circuit reliability
and reduce cost by eliminating external components and
adjustments.
These devices perform a single function—they assert a
reset signal whenever the VCC supply voltage declines
below a preset threshold, keeping it asserted for a preset
timeout period after VCC has risen above the reset
threshold. The only difference among the three devices
is their output. The MAX6801 (push/pull) and MAX6802
(open-drain) have an active-low RESET output, while the
MAX6800 (push/pull) has an active-high RESET output.
The devices are guaranteed to be in the correct state for
VCC down to 0.7V. The MAX6802 is guaranteed to be in
the correct state for VCC down to 1.0V.
The reset comparator in these ICs is designed to ignore
fast transients on VCC. Reset thresholds are factorytrimmable between 2.63V and 4.80V, in approximately
100mV increments. These devices are available with
a 1ms (min), 20ms (min), or 100ms (min) reset pulse
width. Ideal for space-critical applications, the MAX6800/
MAX6801/MAX6802 come packaged in a 3-pin SOT23.
For a lower threshold voltage version, see the MAX6332/
MAX6333/MAX6334.
Applications
●●
●●
●●
●●
●●
Computers
Controllers
Intelligent Instruments
Critical μP/μC Power Monitoring
Portable/Battery-Powered Equipment
3-Pin, Low-Power
μP Reset Circuits
Benefits and Features
●● Ultra-Low 0.7V Operating Supply Voltage
●● Low 4.0μA Supply Current
●● Precision Monitoring of 2.85V to 5.0V PowerSupply Voltages
●● Reset Thresholds Available from 2.63V to 4.80V, in
Approximately 100mV Increments
●● Fully Specified over Temperature
●● Three Power-On Reset Timeout Periods Available
(1ms min, 20ms min, 100ms min)
●● Low Cost
●● Three Available Output Structures: Push/Pull
RESET, Push/Pull RESET, Open-Drain RESET
●● Guaranteed RESET/RESET Valid to VCC = 0.7V
(MAX6800/MAX6801)
●● Power-Supply Transient Immunity
●● No External Components Required
●● 3-Pin SOT23 Package
●● Pin-Compatible with MAX809/MAX810,
MAX6326/MAX6327/MAX6328, and
MAX6346/MAX6347/MAX6348
Typical Operating Circuit
VCC
VCC
VCC
MAX6801
µP
Selector Guide (Standard Versions*) appears at end of data sheet.
RESET
GND
19-1933; Rev 5; 2/16
RESET
GND
MAX6800/MAX6801/
MAX6802
3-Pin, Low-Power
μP Reset Circuits
Absolute Maximum Ratings
Terminal Voltage (with respect to GND)
VCC.......................................................................-0.3V to +6V
Push/Pull RESET, RESET..................... -0.3V to (VCC + 0.3V)
Open-Drain RESET..............................................-0.3V to +6V
Input Current (VCC).............................................................20mA
Output Current (RESET, RESET).......................................20mA
Continuous Power Dissipation (TA = +70°C)
3-Pin SOT23 (derate 4mW/°C above +70°C)..............320mW
Operating Temperature Range.......................... -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°C
Soldering Temperature (reflow)........................................ +300°C
Lead (Pb)-free packages..............................................+260°C
Package containing lead (Pb)......................................+240°C
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
(VCC = full range, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +5.0V and TA = +25°C, reset not
asserted.) (Note 1)
PARAMETER
SYMBOL
Supply Voltage Range
(Note 2)
VCC
Supply Current
ICC
Reset Threshold
VTH
VCC Falling Reset Delay
Reset Active Timeout Period
CONDITIONS
MAX6800/MAX6801
TA = 0°C to +125°C
MAX6802
MAX6800/MAX6801
TA = -40°C to +125°C
MAX6802
VCC = +3.0V
No load
VCC = +5.0V
MAX680_UR_ _D_-T,
Table 1
TA = -40°C to +125°C
VCC falling at 10V/ms
tRP
TYP
4
MAX
5.5
5.5
5.5
5.5
10
5
12
VTH
- 1.8%
VTH
VTH
+ 1.8%
VTH
- 3%
VTH
VTH
+ 3%
30
1
1.5
2
MAX680_UR_ _D2-T
20
30
40
MAX680_UR_ _D3-T
100
150
200
VOL
Reset
asserted
RESET Output High-Voltage
(MAX6801)
VOH
Reset not
asserted
VOH
Reset
asserted
VOL
Reset not
asserted
ISINK = 50µA, VCC ≥ 1.0V
0.3
0.8 x VCC
ISOURCE = 1µA, VCC ≥ 1.0V
0.8 x VCC
ISOURCE = 800µA, VCC ≥ 4.25V
0.8 x VCC
ISOURCE = 200µA, VCC ≥ 1.8V
ISINK = 1.2mA, VCC ≥ 3.0V
µA
V
ms
V
0.4
ISOURCE = 500µA, VCC ≥ 3.0V
ISOURCE = 800µA, VCC ≥ 5.0V
V
0.4
ISINK = 1.2mA, VCC ≥ 2.5V
ISINK = 1.2mA, VCC ≥ 4.25V
UNITS
µs
MAX680_UR_ _D1-T
RESET Output Low-Voltage
(MAX6801/MAX6802)
RESET Output Voltage
(MAX6800)
TA = +25°C
MIN
0.7
1.0
0.78
1.2
V
0.8 x VCC
0.8 x VCC
V
0.3
0.4
ISINK = 3.2mA, VCC ≥ 5.0V
RESET Output Leakage Current
0.5
µA
VCC > VTH, RESET not asserted
(MAX6802)
Note 1: All parts are production tested at TA = +25°C. Overtemperature limits are guaranteed by design and not production tested.
Note 2: ISOURCE for the MAX6800 is 100nA. ISINK for the MAX6801 is 100nA. ISINK for the MAX6802 is 50μA.
www.maximintegrated.com
Maxim Integrated │ 2
MAX6800/MAX6801/
MAX6802
3-Pin, Low-Power
μP Reset Circuits
Typical Operating Characteristics
(Reset not asserted, TA = +25°C, unless otherwise noted.)
4.5
VCC = +3.3V
3.5
-25
0
25
50
100
125
0.980
0.970
40
MAX6800/01/02 toc03
TA = +25°C
TA = -40°C
20
0.960
0.950
-50
-25
0
25
50
75
100
0
125
1.0
1.5
2.0
2.5
3.0
TEMPERATURE (°C)
VCC (V)
RESET (VOH)
vs. SUPPLY VOLTAGE
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
VCC FALLING PROPAGATION DELAY
vs. TEMPERATURE
VTH = 2.93V
ISOURCE = 100A
RESET ASSERTED
(MAX6800)
75
TA = +125°C
50
TA = +85°C
TA = +25°C
25
TA = -40°C
1.0
0.990
TA = +85°C
TEMPERATURE (°C)
100
0
75
1.000
60
1.5
2.0
VCC (V)
www.maximintegrated.com
2.5
3.0
600
500
400
RESET OCCURS
300
200
RESET DOES
NOT OCCUR
100
0
0.1
1
100
90
80
70
VCC = FALLING AT 1V/ms
60
50
40
30
20
VCC = FALLING AT 10V/ms
10
10
100
1000
RESET COMPARATOR OVERDRIVE (mV)
MAX6800/01/02 toc06
-50
MAX6800/01/02 toc04
OUTPUT VOLTAGE HIGH (VCC - VOH) (mV)
3.0
1.010
VTH = 2.93V
ISINK = 500mA
RESET ASSERTED
MAX6801/MAX6802
TA = +125°C
PROPAGATION DELAY (µs)
4.0
1.020
MAX6800/01/02 toc05
5.0
1.030
80
OUTPUT VOLTAGE LOW (mV)
VCC = +5.0V
1.040
MAXIMUM TRANSIENT DURATION (µs)
ICC (µA)
5.5
MAX6800/01/02 toc02
6.0
1.050
NORMALIZED RESET TIMEOUT PERIOD
MAX6800/01/02 toc01
6.5
RESET (VOL)
vs. SUPPLY VOLTAGE
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
0
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
Maxim Integrated │ 3
MAX6800/MAX6801/
MAX6802
3-Pin, Low-Power
μP Reset Circuits
Pin Configuration
TOP VIEW
GND 1
MAX6800
MAX6801
MAX6802
3 VCC
RESET (RESET) 2
SOT23-3
( ) ARE FOR MAX6800
Pin Description
PIN
MAX6800
MAX6801/
MAX6802
NAME
1
1
GND
FUNCTION
Ground
—
2
RESET
Active-Low Reset Output. RESET is asserted while VCC is below the reset
threshold and remains asserted for a reset timeout period (tRP) after VCC
rises above the reset threshold. RESET on the MAX6801 is push/pull.
RESET on the MAX6802 is open-drain.
2
—
RESET
Active-High Reset Output. RESET is asserted while VCC is below the reset
threshold and remains asserted for a reset timeout period (tRP) after VCC
rises above the reset threshold. RESET on the MAX6800 is push/pull.
3
3
VCC
www.maximintegrated.com
Supply Voltage Input
Maxim Integrated │ 4
MAX6800/MAX6801/
MAX6802
3-Pin, Low-Power
μP Reset Circuits
Applications Information
Interfacing to μPs with Bidirectional
Reset Pins
Since the RESET output on the MAX6802 is opendrain, 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 microcontroller’s (μC’s) RESET pin with a single pullup
resistor allows either device to assert reset (Figure 1).
Negative-Going VCC Transients
In addition to issuing a reset to the μP during
power-up, power-down, and brownout conditions, these
devices are relatively immune to short-duration, negativegoing VCC transients (glitches). The Typical Operating
Characteristics show the Maximum Transient Duration
vs. Reset Comparator Overdrive graph. The graph shows
the maximum pulse width that a negative-going VCC
transient may typically have without issuing a reset signal.
As the amplitude of the transient increases, the maximum
allowable pulse width decreases.
Ensuring a Valid Reset Output Down to
VCC = 0V
When VCC falls below 1V and approaches the minimum
operating voltage of 0.7V, push/pull-structured reset
sinking (or sourcing) capabilities decrease drastically.
High-impedance CMOS-logic inputs connected to the
RESET pin can drift to indeterminate voltages. This does
not present a problem in most cases, since most μPs and
circuitry do not operate when VCC drops below 1V. For
the MAX6801 application, where RESET must be valid
down to 0V, adding a pulldown resistor between RESET
and GND removes stray leakage currents, holding RESET
low (Figure 2a). The pulldown resistor value is not critical;
100kΩ is large enough not to load RESET and small
enough to pull it low. For the MAX6800 application, where
RESET must be valid to VCC = 0V, a 100kΩ pullup resistor
between RESET and VCC will hold RESET high when
VCC falls below 0.7V (Figure 2b).
Since the MAX6802 has an open-drain, active-low output,
it typically uses a pullup resistor. With this device, RESET
will most likely not maintain an active condition, but will
drift to a non-active level due to the pullup resistor and
the reduced sinking capability of the open-drain device.
Therefore, this device is not recommended for applications
where the RESET pin is required to be valid down to VCC = 0V.
VCC
VCC
VCC
VCC
VCC
100kΩ
MAX6802
RESET
GND
MAX6801
µP
MOTOROLA
68HCXX
RESET
GND
MAX6800
RESET
GND
(a)
100kΩ*
RESET
100kΩ
GND
(b)
*ASSUMES HIGH-Z RESET INPUT TO THE µP
Figure 1. Interfacing to μPs with Bidirectional Reset Pins
www.maximintegrated.com
Figure 2. Ensuring Reset Valid Down to VCC = 0V
Maxim Integrated │ 5
MAX6800/MAX6801/
MAX6802
3-Pin, Low-Power
μP Reset Circuits
Table 1. Factory-Trimmed Reset Thresholds
RESET
THRESHOLD
SUFFIX
MIN
48
4.714
47
46
TA = +25°C
TYP (VTH)
TA = -40°C to +125°C
MAX
MIN
MAX
4.80
4.886
4.656
4.944
4.615
4.70
4.785
4.559
4.841
4.547
4.63
4.713
4.491
4.769
45
4.419
4.50
4.581
4.365
4.635
44
4.301
4.38
4.459
4.249
4.511
43
4.223
4.30
4.377
4.171
4.429
42
4.124
4.20
4.276
4.074
4.326
41
4.026
4.10
4.174
3.977
4.223
40
3.928
4.00
4.072
3.880
4.120
39
3.830
3.90
3.970
3.783
4.017
38
3.732
3.80
3.868
3.686
3.914
37
3.633
3.70
3.767
3.589
3.811
36
3.535
3.60
3.665
3.492
3.708
35
3.437
3.50
3.563
3.395
3.605
34
3.339
3.40
3.461
3.298
3.502
33
3.241
3.30
3.359
3.201
3.399
32
3.142
3.20
3.258
3.104
3.296
31
3.025
3.08
3.135
2.988
3.172
30
2.946
3.00
3.054
2.910
3.090
29
2.877
2.93
2.983
2.842
3.018
28
2.750
2.80
2.850
2.716
2.884
27
2.651
2.70
2.749
2.619
2.781
26
2.583
2.63
2.677
2.551
2.709
www.maximintegrated.com
Maxim Integrated │ 6
MAX6800/MAX6801/
MAX6802
3-Pin, Low-Power
μP Reset Circuits
Selector Guide (Standard Versions*)
PART
OUTPUT STAGE
NOMINAL VTH (V)
MIN RESET
TIMEOUT (ms)
SOT
TOP MARK
MAX6800UR26D3-T
Push/Pull RESET
2.63
100
FZIE
MAX6800UR29D3-T
Push/Pull RESET
2.93
100
FZIF
MAX6800UR31D3-T
Push/Pull RESET
3.08
100
FZIG
MAX6800UR44D3-T
Push/Pull RESET
4.38
100
FZIH
MAX6800UR46D3-T
Push/Pull RESET
4.63
100
FZII
MAX6801UR26D3-T
Push/Pull RESET
2.63
100
FZIK
MAX6801UR29D3-T
Push/Pull RESET
2.93
100
FZIM
MAX6801UR31D3-T
Push/Pull RESET
3.08
100
FZIN
MAX6801UR44D3-T
Push/Pull RESET
4.38
100
FZIO
MAX6801UR46D3-T
Push/Pull RESET
4.63
100
FZIP
MAX6802UR26D3-T
Open-Drain RESET
2.63
100
FZIQ
MAX6802UR29D3-T
Open-Drain RESET
2.93
100
FZIR
MAX6802UR31D3-T
Open-Drain RESET
3.08
100
FZIS
MAX6802UR44D3-T
Open-Drain RESET
4.38
100
FZIT
MAX6802UR46D3-T
Open-Drain RESET
4.63
100
FZIU
*Sample stock is generally held on all standard versions.
Ordering Information
PART
Chip Information
TEMP RANGE
PIN-PACKAGE
MAX6800UR_ _D_-T
-40°C to +125°C
3 SOT23
MAX6801UR_ _D_-T
-40°C to +125°C
3 SOT23
MAX6802UR_ _D_-T
-40°C to +125°C
3 SOT23
*These devices are available in factory-set VCC reset thresholds from 2.63V to 4.80V, in approximately 0.1V increments.
Choose the desired reset threshold suffix from Table 1 and
insert it in the blanks following “UR” in the part number.
Factory-programmed reset timeout periods are also available.
Insert the number corresponding to the desired nominal reset
timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in
the blank following “D” in the part number. There are 15 standard versions with a required order increment of 2500 pieces.
Sample stock is generally held on the standard versions only
(see Selector Guide). Contact the factory for availability of nonstandard versions (required order increment is 10,000 pieces).
All devices available in tape-and-reel only.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
www.maximintegrated.com
PROCESS: BiCMOS
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
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
3 SOT23
U3-1
21-0051
90-0179
Maxim Integrated │ 7
MAX6800/MAX6801/
MAX6802
3-Pin, Low-Power
μP Reset Circuits
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
3
10/11
Added automotive-qualified part information to Ordering Information.
1
4
3/12
Updated Factory-Trimmed Reset Thresholds table.
5
5
2/16
Updated Ordering Information table
1
DESCRIPTION
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
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.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2016 Maxim Integrated Products, Inc. │ 8
工商网监
湘ICP备2023018690号
