Containing Lead ..........................................................+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
PARAMETER
Operating Voltage Range
Supply Current
(V
CC
= full range, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
CC
= 3V, T
A
= +25°C.) (Note 1)
SYMBOL
V
CC
I
CC
No load,
RESET
deasserted
MAX632_ _UT46
MAX632_ _UT44
Reset Threshold Voltage
V
TH
MAX632_ _UT31
MAX632_ _UT29
MAX632_ _UT26
MAX632_ _UT23
Reset Timeout Delay
V
CC
to
RESET
Delay
t
RP
RESET
deasserted
10mV/ms, V
TH
+100mV to V
TH
- 100mV
I
SINK
= 1.2mA, V
CC
= 2.25V
(MAX632_ _UT23, MAX632_ _UT26,
MAX632_ _UT29, MAX632_ _UT31)
WDPO, RESET
Output Voltage
V
OL
I
SINK
= 3.2mA, V
CC
= 4.25V
(MAX632_ _UT44, MAX632_ _UT46)
I
SINK
= 100μA, V
CC
> 1.2V,
RESET
asserted
I
SOURCE
= 500μA, V
CC
= 3.15V,
RESET
deasserted (MAX632_ _UT23,
MAX632_ _UT26, MAX632_ _UT29,
MAX632_ _UT31)
I
SOURCE
= 800μA, V
CC
= 4.75V,
RESET
deasserted, (MAX632_ _UT44,
MAX632_ _UT46)
I
LKG
V
RESET
= V
WDPO
= +5.5V,
RESET,
WDPO
deasserted
V
CC
= 2.5V or 3.3V
V
CC
= 5.5
4.50
4.25
3.00
2.85
2.55
2.25
100
CONDITIONS
MIN
1.2
23
27
4.63
4.38
3.08
2.93
2.63
2.32
180
20
0.4
V
TYP
MAX
5.5
45
57
4.75
4.50
3.15
3.00
2.70
2.38
280
ms
µs
V
UNITS
V
µA
0.4
0.4
0.8 x V
CC
V
V
CC
- 1.5
1
µA
RESET
Output Voltage
(MAX6323)
V
OH
WDPO, RESET
Output Leakage
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Maxim Integrated
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2
MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
Electrical Characteristics (continued)
PARAMETER
WATCHDOG INPUT AND OUTPUT
SYMBOL
(V
CC
= full range, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
CC
= 3V, T
A
= +25°C.) (Note 1)
CONDITIONS
MAX632_AUT_ _
MAX632_BUT_ _
MAX632_CUT_ _
Watchdog Timeout (Fast)
(Notes 2, 3)
t
WD1
MAX632_DUT_ _
MAX632_EUT_ _
MAX632_FUT_ _
MAX632_GUT_ _
MAX632_HUT_ _
MAX632_AUT_ _
MAX632_BUT_ _
MAX632_CUT_ _
Watchdog Timeout (Slow)
(Note 4)
t
WD2
MAX632_DUT_ _
MAX632_EUT_ _
MAX632_FUT_ _
MAX632_GUT_ _
MAX632_HUT_ _
Minimum Watchdog Input
Pulse Width
WDI Glitch Immunity
WDI Input Voltage
WDI Input Current
WDPO
Pulse Width
MANUAL RESET INPUT
MR
Input Voltage
MR
Minimum Pulse Width
MR
Glitch Immunity
MR
to Reset Delay
MR
Pullup Resistance
V
CC
= 2.5V
V
CC
= 2.5V
50
V
IH
V
IL
1
100
120
85
0.7 x V
CC
0.3 x V
CC
V
µs
ns
ns
kΩ
V
IH
V
IL
V
WDI
= 0V
V
WDI
= V
CC
V
IL
= 0.8V, V
IH
= 0.75V x V
CC
0.5
-1.5
-1
1
1
1.5
3
V
CC
= 5.5V
MIN
1
10
10
10
10
17
29
543
10
100
300
10
60
47
82
1.3
300
100
0.75 x V
CC
0.8
TYP
MAX
1.5
15
15
15
15
23
39
719
15
150
450
15
90
63
108
1.8
s
ms
s
ns
ns
V
µA
ms
ms
ms
UNITS
Note 1:
Devices are tested at T
A
= +25°C and guaranteed by design for T
A
= T
MIN
to T
MAX
, as specified.
Note 2:
WDPO
will pulse low if a falling edge is detected on WDI before this timeout period expires.
Note 3:
To avoid a potential fake fault, the first WDI pulse after the rising edge of
RESET
or
WDPO
will not create a fast watchdog
timeout fault.
Note 4:
WDPO
will pulse low if no falling edge is detected on WDI after this timeout period expires.
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Maxim Integrated
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3
MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
Typical Operating Characteristics
(V
CC
= full range, T
A
= +25°C, unless otherwise noted.)
POWER-DOWN RESET DELAY
vs. TEMPERATURE
MAX6323/24-02
MAX6323/24-01
POWER-DOWN RESET DELAY (µs)
35
SUPPLY CURRENT (µA)
30
25
20
15
10
5
0
-40
V
CC
= 5.5V
25
20
15
10
5
0
MR TO RESET DELAY (ns)
V
OD
= 20mV
140
120
100
80
60
40
20
V
CC
= 3.3V
V
CC
= 1.0V
V
OD
= 100mV
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
0
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX6323/24-04
MAX6323/24-05
POWER-UP RESET TIMEOUT
1.0000
RESET THRESHOLD
0.9995
0.9990
0.9985
0.9980
1.006
1.004
1.002
1.000
0.998
0.996
0.994
-40
-20
0
20
40
60
80
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX6323/24-07
MAX6323/24-08
1.002
1.001
1.000
0.999
0.998
0.997
0.996
0.995
-40
-20
0
20
40
60
80
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
-40
-20
0
20
40
60
80
MAXIMUM TRANSIENT DURATION (µs)
350
300
250
200
150
100
50
0
1
10
V
OD
= V
TH
- V
CC
RESET ASSERTED
ABOVE THIS LINE
MAX632_AUT23
100
1000
TEMPERATURE (°C)
TEMPERATURE (°C)
RESET COMPARATOR OVERDRIVE (mV)
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Maxim Integrated
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4
MAX6323/24-09
1.003
NORMALIZED WATCHDOG OUTPUT PULSE WIDTH (µs)
NORMALIZED WATCHDOG TIMEOUT PERIOD (SLOW)
NORMALIZED WATCHDOG TIMEOUT
PERIOD (SLOW) vs. TEMPERATURE
1.008
NORMALIZED WATCHDOG OUTPUT
PULSE WIDTH vs. TEMPERATURE
400
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6323/24-06
1.0005
1.008
NORMALIZED WATCHDOG TIMEOUT PERIOD (FAST)
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
NORMALIZED POWER-UP RESET TIMEOUT
vs. TEMPERATURE
1.008
NORMALIZED WATCHDOG TIMEOUT
PERIOD (FAST) vs. TEMPERATURE
MAX6323/24-03
40
SUPPLY CURRENT vs. TEMPERATURE
30
160
MR TO RESET DELAY
vs. TEMPERATURE
MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
Typical Operating Characteristics (continued)
(V
CC
= full range, T
A
= +25°C, unless otherwise noted.)
FAST WATCHDOG TIMEOUT PERIOD
MAX6323/24-10
SLOW WATCHDOG TIMEOUT PERIOD
MAX6323/24-11
WDI
2V/div
WDI
2V/div
WDPO
2V/div
WDPO
2V/div
MAX6323AUT23
500µs/div
MAX6323AUT23
5ms/div
Pin Description
PIN
1
2
NAME
MR
GND
FUNCTION
Active-Low, Manual Reset Input. When
MR
is asserted low,
RESET
is asserted low, the internal watchdog
timer is reset to zero, and
WDPO
is reset to high impedance (open drain). After the rising edge of
MR,
RESET
is asserted for at least 100ms. Leave
MR
unconnected or connect to V
CC
if unused.
Ground
Watchdog Input. The internal watchdog timer clears to zero on the falling edge of WDI or when
RESET
goes
high. If WDI sees another falling edge within the factory-trimmed watchdog window,
WDPO
will
remain unasserted. Transitions outside this window, either faster or slower, will cause
WDPO
to pulse
low for 1ms (typ).
Supply Voltage for the Device. Input for V
CC
reset monitor. For noisy systems, bypass V
CC
with a 500pF
(min) capacitor.
Watchdog Pulse Output. The open-drain
WDPO
output is pulsed low for 1ms (typ) upon detection of a fast
or slow watchdog fault.
WDPO
is only active when
RESET
is high.
Active-Low. Reset is asserted when V
CC
drops below V
TH
and remains asserted until V
CC
rises above
V
TH
for the duration of the reset timeout period. The MAX6323 has a push-pull output and the MAX6324
has an open-drain output. Connect a pullup resistor from
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