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 T
A
= +25°C and V
CC
= 3V, reset not asserted.)
PARAMETER
SYMBOL
CONDITIONS
T
A
= 0°C to +85°C
Supply Voltage Range
V
CC
T
A
= -40°C to +85°C
T
A
= 0°C to +125°C
Supply Current
I
CC
No load
MAX6332/MAX6333
MAX6334
MAX6332/MAX6333
MAX6334
MAX6332/MAX6333
MAX6334
V
CC
= 1.8V
V
CC
= 2.5V
T
A
= +25°C
T
A
= -40°C to +125°C
V
TH
- 1.8%
V
TH
- 3%
1
20
100
MIN
0.7
1.0
0.78
1.2
1.2
3.0
3.3
V
TH
V
TH
24
1.5
30
150
2
40
200
0.4
0.3
0.8 x V
CC
0.8 x V
CC
0.8 x V
CC
0.8 x V
CC
0.3
0.3
0.5
µA
V
V
V
ms
TYP
MAX
5.5
5.5
5.5
5.5
5.5
6.0
7.0
V
TH
+ 1.8%
V
TH
+ 3%
µA
V
UNITS
Reset Threshold
V
TH
MAX633_UR__D_-T,
Table 1
V
CC
falling at 10V/ms
MAX633_UR__D1-T
V
V
CC
Falling Reset Delay
Reset Active Timeout Period
t
RP
µs
MAX633_UR__D2-T
MAX633_UR__D3-T
I
SINK
= 50µA, V
CC
≥ 1.0V
I
SINK
= 500µA, V
CC
≥ 1.8V
I
SOURCE
= 200µA, V
CC
≥ 1.8V
I
SOURCE
= 500µA, V
CC
≥ 2.7V
I
SOURCE
= 1µA, V
CC
≥ 1.0V
I
SOURCE
= 200µA, V
CC
≥ 1.8V
I
SINK
= 500µA, V
CC
≥ 1.8V
I
SINK
= 1.2mA, V
CC
≥ 2.7V
RESET
Output Low Voltage
(MAX6333/MAX6334)
RESET
Output High Voltage
(MAX6333)
V
OL
V
OH
V
OH
V
OL
Reset
asserted
Reset not
asserted
Reset
asserted
Reset not
asserted
RESET Output Voltage
(MAX6332)
RESET
Output Leakage
Current (MAX6334)
V
CC
> V
TH
,
RESET
not asserted
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Maxim Integrated │
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MAX6332/MAX6333/
MAX6334
Typical Operating Characteristics
3-Pin, Ultra-Low-Voltage, Low-Power
μP Reset Circuits
(Reset not asserted, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX6332/33/34 toc01
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX6332/33/34 toc02
V
CC
FALLING PROPAGATION DELAY
vs. TEMPERATURE
70
60
50
40
30
20
V
CC
FALLING AT 10V/ms
V
CC
FALLING AT 1V/ms
MAX6332/33/34 toc03
4.0
3.8
3.6
3.4
I
CC
(µA)
3.2
3.0
2.8
2.6
2.4
2.2
2.0
-60
-40
-20
0
RESET NOT ASSERTED
20
40
60
80
V
CC
= 1.8V
V
CC
= 2.5V
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
-60
-40
-20
0
20
40
60
80
V
TH
= 2.2V
80
PROPAGATION DELAY (µs)
100
100
10
-60
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX6332/33/34 toc04
MAX6332/33/34 toc05
OUTPUT VOLTAGE HIGH (V
CC
- V
OH
) (mV)
MAXIMUM TRANSIENT DURATION (µs)
120
100
80
60
40
20
0
T
A
= +85°C
OUTPUT VOLTAGE LOW (mV)
500
400
300
200
100
0
RESET DOES
NOT OCCUR
0.1
RESET OCCURS
140
V
TH
= 2.2V
I
SOURCE
= 100µA
RESET ASSERTED
70
60
50
40
30
20
10
0
0.5
T
A
= -40°C
V
TH
= 2.5V
I
SINK
= 500µA
RESET ASSERTED
T
A
= +25°C
T
A
= +25°C
T
A
= +85°C
T
A
= -40°C
100
1000
RESET COMPARATOR OVERDRIVE (mV)
1
10
0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25 2.5
V
CC
(V)
1.00
1.50
2.00
2.50
3.00
V
CC
(V)
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MAX6332/33/34 toc06
600
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
160
OUTPUT VOLTAGE HIGH
vs. SUPPLY VOLTAGE
OUTPUT VOLTAGE LOW
vs. SUPPLY VOLTAGE
80
MAX6332/MAX6333/
MAX6334
Pin Configuration
TOP VIEW
GND 1
3-Pin, Ultra-Low-Voltage, Low-Power
μP Reset Circuits
MAX6332
MAX6333
MAX6334
3 V
CC
RESET (RESET) 2
( ) ARE FOR MAX6332
SOT23-3
Pin Description
PIN
MAX6332
1
—
MAX6333
MAX6334
1
2
NAME
GND
RESET
Ground
Active-Low Reset Output.
RESET
remains low while V
CC
is below the reset
threshold and for a reset timeout period (t
RP
) after V
CC
rises above the
reset threshold.
RESET
on the MAX6334 is open-drain.
Active-High Reset Output. RESET remains high while V
CC
is below the
reset threshold and for a reset timeout period (t
RP
) after V
CC
rises above
the reset threshold.
Supply Voltage (0.7V to 5.5V)
FUNCTION
2
3
—
3
RESET
V
CC
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MAX6332/MAX6333/
MAX6334
Applications Information
Interfacing to μPs with Bidirectional
Reset Pins
Since the
RESET
output on the MAX6334 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, Ultra-Low-Voltage, Low-Power
μP Reset Circuits
V
CC
V
CC
V
CC
µP
MOTOROLA
68HCXX
RESET
INPUT
GND
MAX6334
RESET
GND
Negative-Going V
CC
Transients
Figure 1. Interfacing to μPs with Bidirectional Reset Pins
V
CC
V
CC
MAX6333
RESET
GND
MAX6332
RESET
100kΩ*
100kΩ
(b)
When V
CC
falls below 1V and approaches the minimum
operating voltage of 0.7V, push/pull-structured reset
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