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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6802 Datasheet

Low-Power uP Reset Circuits

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MAX6800/MAX6801/
MAX6802
3-Pin, Low-Power
μP Reset Circuits
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 factory-
trimmable 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
Selector Guide (Standard Versions*) appears at end of data sheet.
Benefits and Features
Ultra-Low 0.7V Operating Supply Voltage
Low 4.0μA Supply Current
Precision Monitoring of 2.85V to 5.0V Power-
Supply 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
MAX6801
RESET
VCC
µP
RESET
GND GND
19-1933; Rev 5; 2/16


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6802 Datasheet

Low-Power uP Reset Circuits

No Preview Available !

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
Supply Voltage Range
(Note 2)
Supply Current
Reset Threshold
SYMBOL
VCC
ICC
CONDITIONS
TA = 0°C to +125°C
MAX6800/MAX6801
MAX6802
TA = -40°C to +125°C
MAX6800/MAX6801
MAX6802
No load
VCC = +3.0V
VCC = +5.0V
VTH
MAX680_UR_ _D_-T, TA = +25°C
Table 1
TA = -40°C to +125°C
MIN
0.7
1.0
0.78
1.2
VTH
- 1.8%
VTH
- 3%
TYP
4
5
VTH
VTH
MAX
5.5
5.5
5.5
5.5
10
12
VTH
+ 1.8%
VTH
+ 3%
UNITS
V
µA
V
VCC Falling Reset Delay
VCC falling at 10V/ms
MAX680_UR_ _D1-T
30 µs
1 1.5 2
Reset Active Timeout Period
tRP MAX680_UR_ _D2-T
MAX680_UR_ _D3-T
20 30 40 ms
100 150 200
RESET Output Low-Voltage
(MAX6801/MAX6802)
VOL
Reset
asserted
ISINK = 50µA, VCC ≥ 1.0V
ISINK = 1.2mA, VCC ≥ 2.5V
ISINK = 1.2mA, VCC ≥ 4.25V
0.4
0.3 V
0.4
RESET Output High-Voltage
(MAX6801)
VOH
Reset not
asserted
ISOURCE = 500µA, VCC ≥ 3.0V
ISOURCE = 800µA, VCC ≥ 5.0V
0.8 x VCC
0.8 x VCC
V
RESET Output Voltage
(MAX6800)
VOH
VOL
Reset
asserted
Reset not
asserted
ISOURCE = 1µA, VCC ≥ 1.0V
ISOURCE = 200µA, VCC ≥ 1.8V
ISOURCE = 800µA, VCC ≥ 4.25V
ISINK = 1.2mA, VCC ≥ 3.0V
ISINK = 3.2mA, VCC ≥ 5.0V
0.8 x VCC
0.8 x VCC
0.8 x VCC
V
0.3
0.4
RESET Output Leakage Current
(MAX6802)
VCC > VTH, RESET not asserted
0.5 µA
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


Part Number MAX6802
Description Low-Power uP Reset Circuits
Maker Maxim
Total Page 8 Pages
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