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
CC
= full range, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
CC
= +5.0V and T
A
= +25°C, reset not
asserted.) (Note 1)
PARAMETER
Supply Voltage Range
(Note 2)
Supply Current
SYMBOL
V
CC
CONDITIONS
MAX6800/MAX6801
T
A
= 0°C to +125°C
MAX6802
MAX6800/MAX6801
T
A
= -40°C to +125°C
MAX6802
V
CC
= +3.0V
No load
V
CC
= +5.0V
MAX680_UR_ _D_-T,
Table 1
V
CC
falling at 10V/ms
MAX680_UR_ _D1-T
MAX680_UR_ _D2-T
MAX680_UR_ _D3-T
Reset
asserted
Reset not
asserted
Reset
asserted
Reset not
asserted
I
SINK
= 50µA, V
CC
≥ 1.0V
I
SINK
= 1.2mA, V
CC
≥ 2.5V
t
RP
T
A
= +25°C
T
A
= -40°C to +125°C
MIN
0.7
1.0
0.78
1.2
TYP
MAX
5.5
5.5
5.5
5.5
10
12
V
TH
+ 1.8%
V
TH
+ 3%
2
40
200
0.4
0.3
0.4
0.8 x V
CC
0.8 x V
CC
0.8 x V
CC
0.8 x V
CC
0.3
0.4
V
0.8 x V
CC
V
V
ms
UNITS
V
I
CC
4
5
V
TH
- 1.8%
V
TH
- 3%
1
20
100
V
TH
V
TH
30
1.5
30
150
µA
Reset Threshold
V
CC
Falling Reset Delay
Reset Active Timeout Period
V
TH
V
µs
RESET
Output Low-Voltage
(MAX6801/MAX6802)
RESET
Output High-Voltage
(MAX6801)
V
OL
V
OH
V
OH
V
OL
I
SOURCE
= 500µA, V
CC
≥ 3.0V
I
SOURCE
= 1µA, V
CC
≥ 1.0V
I
SOURCE
= 800µA, V
CC
≥ 5.0V
I
SOURCE
= 200µA, V
CC
≥ 1.8V
I
SINK
= 1.2mA, V
CC
≥ 4.25V
RESET Output Voltage
(MAX6800)
I
SINK
= 1.2mA, V
CC
≥ 3.0V
I
SINK
= 3.2mA, V
CC
≥ 5.0V
I
SOURCE
= 800µA, V
CC
≥ 4.25V
RESET
Output Leakage Current
0.5
µA
V
CC
> V
TH
,
RESET
not asserted
(MAX6802)
Note 1:
All parts are production tested at T
A
= +25°C. Overtemperature limits are guaranteed by design and not production tested.
Note 2:
I
SOURCE
for the MAX6800 is 100nA. I
SINK
for the MAX6801 is 100nA. I
SINK
for the MAX6802 is 50μA.
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Maxim Integrated │
2
MAX6800/MAX6801/
MAX6802
Typical Operating Characteristics
3-Pin, Low-Power
μP Reset Circuits
(Reset not asserted, T
A
= +25°C, unless otherwise noted.)
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX6800/01/02 toc01
MAX6800/01/02 toc02
SUPPLY CURRENT vs. TEMPERATURE
6.5
6.0
5.5
I
CC
(µA)
5.0
4.5
4.0
3.5
3.0
-50
-25
0
25
50
75
100
125
V
CC
= +3.3V
V
CC
= +5.0V
1.050
NORMALIZED RESET TIMEOUT PERIOD
1.040
1.030
1.020
1.010
1.000
0.990
0.980
0.970
0.960
0.950
RESET
(V
OL
)
vs. SUPPLY VOLTAGE
T
A
= +125°C
60
T
A
= +85°C
40
T
A
= +25°C
T
A
= -40°C
V
TH
= 2.93V
I
SINK
= 500mA
RESET
ASSERTED
MAX6801/MAX6802
MAX6800/01/02 toc03
80
OUTPUT VOLTAGE LOW (mV)
20
-50
-25
0
25
50
75
100
125
0
1.0
1.5
2.0
V
CC
(V)
2.5
3.0
TEMPERATURE (°C)
TEMPERATURE (°C)
RESET (V
OH
)
vs. SUPPLY VOLTAGE
MAX6800/01/02 toc04
OUTPUT VOLTAGE HIGH (V
CC
- V
OH
) (mV)
MAXIMUM TRANSIENT DURATION (µs)
75
PROPAGATION DELAY (µs)
V
TH
= 2.93V
I
SOURCE
= 100A
RESET ASSERTED
(MAX6800)
T
A
= +125°C
T
A
= +85°C
T
A
= +25°C
MAX6800/01/02 toc05
500
400
300
200
100
0
RESET DOES
NOT OCCUR
0.1
RESET OCCURS
90
80
70
60
50
40
30
20
10
0
V
CC
= FALLING AT 10V/ms
-50
-25
0
25
50
75
100
V
CC
= FALLING AT 1V/ms
50
25
T
A
= -40°C
1.0
1.5
2.0
V
CC
(V)
0
2.5
3.0
100
1000
RESET COMPARATOR OVERDRIVE (mV)
1
10
125
TEMPERATURE (°C)
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Maxim Integrated │ 3
MAX6800/01/02 toc06
100
600
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
100
V
CC
FALLING PROPAGATION DELAY
vs. TEMPERATURE
MAX6800/MAX6801/
MAX6802
Pin Configuration
TOP VIEW
GND 1
3-Pin, Low-Power
μP Reset Circuits
MAX6800
MAX6801
MAX6802
3 V
CC
RESET
(RESET) 2
SOT23-3
( ) ARE FOR MAX6800
Pin Description
PIN
MAX6800
1
—
MAX6801/
MAX6802
1
2
NAME
GND
Ground
Active-Low Reset Output.
RESET
is asserted while V
CC
is below the reset
threshold and remains asserted for a reset timeout period (t
RP
) after V
CC
rises above the reset threshold.
RESET
on the MAX6801 is push/pull.
RESET
on the MAX6802 is open-drain.
Active-High Reset Output. RESET is asserted while V
CC
is below the reset
threshold and remains asserted for a reset timeout period (t
RP
) after V
CC
rises above the reset threshold. RESET on the MAX6800 is push/pull.
Supply Voltage Input
FUNCTION
RESET
2
3
—
3
RESET
V
CC
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Maxim Integrated │ 4
MAX6800/MAX6801/
MAX6802
Applications Information
Interfacing to μPs with Bidirectional
Reset Pins
Since the
RESET
output on the MAX6802 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 microcontroller’s (μC’s)
RESET
pin with a single pullup
resistor allows either device to assert reset (Figure
1).
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, negative-
going V
CC
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 V
CC
transient may typically have without issuing a reset signal.
As the amplitude of the transient increases, the maximum
allowable pulse width decreases.
3-Pin, Low-Power
μP Reset Circuits
Ensuring a Valid Reset Output Down to
V
CC
= 0V
Negative-Going V
CC
Transients
When V
CC
falls below 1V and approaches the minimum
operating voltage of 0.7V, push/pull-structured reset
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