Packages 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
(
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
MAX6332/MAX6333
T
A
= 0°C to +85°C
MAX6334
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
Supply Current
I
CC
No load
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
TYP
MAX
5.5
5.5
5.5
5.5
5.5
6.0
7.0
V
TH +
1.8%
V
TH +
3%
2
40
200
0.4
0.3
0.8V
CC
0.8V
CC
0.8V
CC
0.8V
CC
0.3
0.3
0.5
µA
V
UNITS
Supply Voltage Range
V
CC
Reset Threshold
V
TH
MAX633_UR__D_-T,
Table 1
V
CC
falling at 10V/ms
MAX633_UR__D1-T
MAX633_UR__D2-T
MAX633_UR__D3-T
Reset
asserted
Reset not
asserted
Reset
asserted
Reset not
asserted
V
V
CC
Falling Reset Delay
Reset Active Timeout Period
RESET
Output Low Voltage
(MAX6333/MAX6334)
RESET
Output High Voltage
(MAX6333)
µs
ms
t
RP
V
OL
V
OH
V
OH
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
V
V
V
V
µA
RESET Output Voltage
(MAX6332)
V
OL
RESET
Output Leakage
Current (MAX6334)
V
CC
> V
TH,
RESET
deasserted
2
3-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits
Typical Operating Characteristics
(Reset not asserted, T
A
= +25°C, unless otherwise noted.)
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX6332/33/34 toc-1
MAX6332/MAX6333/MAX6334
SUPPLY CURRENT vs. TEMPERATURE
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
20
40
60
80
100
TEMPERATURE (°C)
RESET NOT ASSERTED
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
V
CC
FALLING PROPAGATION DELAY
vs. TEMPERATURE
MAX6332/33/34 toc-3
MAX6332/33/34-2
80
70
PROPAGATION DELAY (µs)
60
50
40
30
20
10
V
CC
FALLING AT 10V/ms
V
CC
FALLING AT 1V/ms
V
TH
= 2.2V
-60
-40
-20
0
20
40
60
80
100
-60
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
MAX6332/33/34 toc-4
OUTPUT VOLTAGE HIGH
vs. SUPPLY VOLTAGE
MAX6332/33/34 toc-5
OUTPUT VOLTAGE LOW
vs. SUPPLY VOLTAGE
70
OUTPUT VOLTAGE LOW (mV)
60
50
40
30
20
T
A
= -40°C
10
0
0.5
1.00
1.50
2.00
2.50
3.00
T
A
= +25°C
T
A
= +85°C
V
TH
= 2.5V
I
SINK
= 500µA
RESET ASSERTED
MAX6332/33/34 toc-6
600
MAXIMUM TRANSIENT DURATION (µs)
500
400
300
200
100
0
0.1
RESET DOES
NOT OCCUR
RESET OCCURS
160
OUTPUT VOLTAGE HIGH (V
CC
- V
OH
) (mV)
140
120
100
80
60
T
A
= +25°C
40
20
0
T
A
= +85°C
T
A
= -40°C
V
TH
= 2.2V
I
SOURCE
= 100µA
RESET ASSERTED
80
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)
V
CC
(V)
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
3
3-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits
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 bidirec-
tional 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
pull-up resistor allows either device to assert reset
(Figure 1).
V
CC
V
CC
V
CC
µP
MOTOROLA
68HCXX
RESET
INPUT
GND
MAX6334
RESET
GND
Negative-Going V
CC
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, negative-going V
CC
transients (glitches). The
Typical Operating Characteristics
show the Maximum Transient Duration vs. Reset
Comparator Overdrive graph. The graph shows the maxi-
mum pulse width that a negative-going V
CC
transient may
typically have without issuing a reset signal. As the ampli-
tude of the transient increases, the maximum allowable
pulse width decreases.
Ensuring a Valid Reset Output
Down to V
CC
= 0
When V
CC
falls below 1V and approaches the minimum
operating voltage of 0.7V, push/pull-structured reset
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