MAX6324BUT46+T [MAXIM]
Power Supply Management Circuit, Fixed, 1 Channel, BICMOS, PDSO6, ROHS COMPLIANT, SOT-23, 6 PIN;
| 型号： | MAX6324BUT46+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Management Circuit, Fixed, 1 Channel, BICMOS, PDSO6, ROHS COMPLIANT, SOT-23, 6 PIN 信息通信管理 光电二极管 |
| 文件： | 总13页 (文件大小：1244K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
General Description
Features
The MAX6323/MAX6324 microprocessor (µP) supervi-
sory circuits monitor power supplies and µP activity in
digital systems. A watchdog timer looks for activity out-
side an expected window of operation. Six laser-trimmed
reset thresholds are available with ±2.5% accuracy from
+2.32V to +4.63V. Valid RESET output is guaranteed
● Min/Max (Windowed) Watchdog,
8 Factory-Trimmed Timing Options
● Pulsed Open-Drain, Active-Low Watchdog Output
● Power-On Reset
● Precision Monitoring of +2.5V, +3.0V, +3.3V,
and +5.0V Power Supplies
● Open-Drain or Push-Pull RESET Outputs
● Low-Power Operation (23µA typ)
● Debounced Manual Reset Input
down to V
= +1.2V.
CC
The RESET output is either push-pull (MAX6323) or
open-drain (MAX6324). RESET is asserted low when
V
CC
falls below the reset threshold, or when the manual
● Guaranteed Reset Valid to V
● AEC-Q100 Qualified MAX6324HUT44/V+T
= +1.2V
CC
reset input (MR) is asserted low. RESET remains assert-
ed for at least 100ms after V rises above the reset
CC
threshold and MR is deasserted.
Ordering Information
The watchdog pulse output (WDPO) utilizes an open-
drain configuration. It can be triggered either by a fast
timeout fault (watchdog input pulses are too close to each
other) or a slow timeout fault (no watchdog input pulse is
observed within the timeout period). The watchdog time-
out is measured from the last falling edge of watchdog
input (WDI) with a minimum pulse width of 300ns. WDPO
is asserted for 1ms when a fault is observed. Eight laser-
trimmed timeout periods are available.
TEMP
RANGE
PIN-
PACKAGE OUTPUT
-40°C to +125°C 6 SOT23 Push-Pull
RESET
PART
MAX6323_UT_ _-T
Ordering Information continued at end of data sheet.
*These devices are factory trimmed to one of eight watchdog-
timeout windows and one of six reset voltage thresholds. Insert
the letter corresponding to the desired watchdog-timeout window
(A, B, C, D, E, F, G, or H) into the blank following the number
6323 or 6324 (see Watchdog Timeout table). Insert the two-
digit code (46, 44, 31, 29, 26, or 23) after the letters UT for the
desired nominal reset threshold (see Reset Threshold Range
table at end of data sheet).
The MAX6323/MAX6324 are offered in a 6-pin SOT23
package and operate over the extended temperature
range (-40°C to +125°C).
/V denotes an automotive qualified part.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Note: There are eight standard versions of each device available
(see Standard Versions table). Sample stock is generally held on
standard versions only. Standard versions have an order
increment requirement of 2500 pieces. Nonstandard versions
have an order increment requirement of 10,000 pieces. Contact
factory for availability of nonstandard versions.
Applications
● Automotive
● Industrial
● Medical
● Embedded Control Systems
Watchdog Timeout
Pin Configuration
WATCHDOG TIMEOUT*
FAST
SLOW
UNITS
TOP VIEW
SUFFIX
MAX
1.5
15
UNITS
ms
MIN
10
MR
GND
WDI
1
2
3
6
5
4
RESET
WDPO
A
B
C
D
E
F
ms
100
300
10
ms
s
MAX6323
MAX6324
15
ms
15
ms
15
ms
60
V
CC
23
ms
47
ms
s
SOT23
G
H
39
ms
82
719
ms
1.3
*See Figure 1 for operation.
Typical Operating Circuit appears at end of data sheet.
19-1838; Rev 7; 3/18
MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
Absolute Maximum Ratings
Terminal Voltage (with respect to GND)
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)
V
...................................................................-0.3V to +6.0V
CC
MR, RESET (MAX6323), WDI.............. -0.3V to (V
+ 0.3V)
CC
WDPO, RESET (MAX6324).............................-0.3V to +6.0V
Input Current, V , WDI, MR.............................................20mA
CC
Output Current, RESET, WDPO ........................................20mA
Lead(Pb)-Free .............................................................+260°C
Containing Lead ..........................................................+240°C
Rate of Rise, V
..........................................................100V/µs
CC
Continuous Power Dissipation (T = +70°C)
A
6-Pin SOT23 (derate 8.7mW/°C above +70°C) ..........696mW
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
= full range, T = -40°C to +125°C, unless otherwise noted. Typical values are at V
= 3V, T = +25°C.) (Note 1)
CC
A
CC A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
UNITS
Operating Voltage Range
V
1.2
V
CC
V
V
= 2.5V or 3.3V
= 5.5
23
45
No load, RESET
deasserted
CC
Supply Current
I
µA
CC
27
57
CC
MAX632_ _UT46
MAX632_ _UT44
MAX632_ _UT31
MAX632_ _UT29
MAX632_ _UT26
MAX632_ _UT23
RESET deasserted
4.50
4.25
3.00
2.85
2.55
2.25
100
4.63
4.38
3.08
2.93
2.63
2.32
180
20
4.75
4.50
3.15
3.00
2.70
2.38
280
Reset Threshold Voltage
Reset Timeout Delay
V
t
V
TH
ms
µs
RP
V
to RESET Delay
10mV/ms, V +100mV to V - 100mV
TH TH
CC
I
= 1.2mA, V
= 2.25V
SINK
CC
(MAX632_ _UT23, MAX632_ _UT26,
MAX632_ _UT29, MAX632_ _UT31)
0.4
WDPO, RESET Output Voltage
V
V
I
= 3.2mA, V
= 4.25V
OL
SINK
CC
0.4
0.4
(MAX632_ _UT44, MAX632_ _UT46)
I
= 100μA, V > 1.2V,
SINK
CC
RESET asserted
I
= 500μA, V = 3.15V,
CC
SOURCE
RESET deasserted (MAX632_ _UT23,
MAX632_ _UT26, MAX632_ _UT29,
MAX632_ _UT31)
0.8 x V
CC
RESET Output Voltage
(MAX6323)
V
V
OH
I
= 800μA, V
= 4.75V, RESET
SOURCE
CC
deasserted, (MAX632_ _UT44,
MAX632_ _UT46)
V
- 1.5
CC
V
= V
= +5.5V, RESET,
RESET
WDPO
WDPO, RESET Output Leakage
I
1
µA
LKG
WDPO deasserted
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MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
Electrical Characteristics (continued)
(V
= full range, T = -40°C to +125°C, unless otherwise noted. Typical values are at V
= 3V, T = +25°C.) (Note 1)
CC
A
CC A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
WATCHDOG INPUT AND OUTPUT
MAX632_AUT_ _
1
1.5
15
MAX632_BUT_ _
MAX632_CUT_ _
MAX632_DUT_ _
MAX632_EUT_ _
MAX632_FUT_ _
MAX632_GUT_ _
MAX632_HUT_ _
MAX632_AUT_ _
MAX632_BUT_ _
MAX632_CUT_ _
MAX632_DUT_ _
MAX632_EUT_ _
MAX632_FUT_ _
MAX632_GUT_ _
MAX632_HUT_ _
10
10
15
10
15
Watchdog Timeout (Fast)
(Notes 2, 3)
t
ms
WD1
10
15
17
23
29
39
543
10
719
15
100
300
10
150
450
15
ms
Watchdog Timeout (Slow)
(Note 4)
t
s
WD2
60
90
47
63
ms
82
108
1.8
1.3
s
Minimum Watchdog Input
Pulse Width
300
ns
ns
WDI Glitch Immunity
V
= 5.5V
100
CC
V
0.75 x V
-1.5
IH
CC
WDI Input Voltage
V
V
0.8
IL
V
V
V
= 0V
-1
1
WDI
WDI Input Current
µA
ms
= V
1.5
3
WDI
CC
WDPO Pulse Width
= 0.8V, V = 0.75V x V
IH
0.5
1
IL
CC
MANUAL RESET INPUT
V
0.7 x V
1
IH
CC
MR Input Voltage
V
V
0.3 x V
CC
IL
MR Minimum Pulse Width
MR Glitch Immunity
µs
ns
ns
kΩ
V
V
= 2.5V
100
120
85
CC
MR to Reset Delay
= 2.5V
CC
MR Pullup Resistance
50
Note 1: Devices are tested at T = +25°C and guaranteed by design for T = T
to T
, as specified.
MAX
A
A
MIN
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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MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
Typical Operating Characteristics
(V
= full range, T = +25°C, unless otherwise noted.)
A
CC
POWER-DOWN RESET DELAY
vs. TEMPERATURE
MR TO RESET DELAY
vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
40
35
30
25
20
160
140
120
100
80
V
CC
= 5.5V
V
OD
= 20mV
30
25
20
15
10
5
15
10
V
CC
= 3.3V
60
V
OD
= 100mV
40
V
CC
= 1.0V
5
0
20
0
0
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
NORMALIZED POWER-UP RESET TIMEOUT
vs. TEMPERATURE
NORMALIZED WATCHDOG TIMEOUT
PERIOD (FAST) vs. TEMPERATURE
1.0005
1.0000
0.9995
1.008
1.006
1.004
1.008
1.006
1.004
1.002
1.000
0.998
1.002
1.000
0.998
0.9990
0.9985
0.9980
0.996
0.994
0.992
0.996
0.994
-40
-20
0
20
40
60
80
-40 -20
0
20
40
60
80
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
NORMALIZED WATCHDOG OUTPUT
PULSE WIDTH vs. TEMPERATURE
NORMALIZED WATCHDOG TIMEOUT
PERIOD (SLOW) vs. TEMPERATURE
1.003
1.002
1.001
1.000
0.999
0.998
1.008
1.006
1.004
1.002
1.000
0.998
400
350
300
V
= V - V
TH CC
OD
250
200
RESET ASSERTED
ABOVE THIS LINE
150
100
50
0.996
0.994
0.992
0.997
0.996
0.995
MAX632_AUT23
100
0
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
1
10
1000
TEMPERATURE (°C)
TEMPERATURE (°C)
RESET COMPARATOR OVERDRIVE (mV)
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MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
Typical Operating Characteristics (continued)
(V
= full range, T = +25°C, unless otherwise noted.)
A
CC
FAST WATCHDOG TIMEOUT PERIOD
SLOW WATCHDOG TIMEOUT PERIOD
MAX6323/24-10
MAX6323/24-11
WDI
WDI
2V/div
2V/div
2V/div
2V/div
WDPO
WDPO
MAX6323AUT23
500µs/div
MAX6323AUT23
5ms/div
Pin Description
PIN
NAME
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,
1
MR
RESET is asserted for at least 100ms. Leave MR unconnected or connect to V
if unused.
CC
2
GND
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).
3
WDI
Supply Voltage for the Device. Input for V
(min) capacitor.
reset monitor. For noisy systems, bypass V
with a 500pF
CC
CC
4
5
V
CC
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.
WDPO
RESET
Active-Low. Reset is asserted when V
drops below V and remains asserted until V
rises above
CC
CC
TH
6
V
for the duration of the reset timeout period. The MAX6323 has a push-pull output and the MAX6324
TH
has an open-drain output. Connect a pullup resistor from RESET to any supply voltage up to +6V.
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MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
t
(min)
)
t
(max)
t
(min)
t
(max)
WD1
WD1
WD2
WD2
POSSIBLE STATES
GUARANTEED TO
ASSERT WDPO
GUARANTEED NOT TO
ASSERT WDPO
GUARANTEED TO
ASSERT WDPO
*
*
UNDETERMINED
UNDETERMINED
CONDITION 1
CONDITION 2
CONDITION 3
FAST FAULT
NORMAL OPERATION
SLOW FAULT
*
UNDETERMINED STATES MAY OR MAY NOT GENERATE A FAULT CONDITION.
Figure 1. Detailed Watchdog Input Timing Relationship
than t
apart (slower than t
) (Figure 2) or falling edges that are too far
WD1
Detailed Description
The MAX6323/MAX6324 μP supervisory circuits maintain
) (Figure 3), WDPO is pulsed
WD2
low. Normal watchdog operation is displayed in Figure 4
(WDPO is not asserted). The internal watchdog timer is
cleared when a WDI falling edge is detected within the
valid watchdog window or when the device’s RESET or
WDPO outputs are deasserted. All WDI input pulses are
ignored while either RESET or WDPO is asserted. Figure
1 identifies the input timing regions where WDPO fault
system integrity by alerting the μP to fault conditions. In
addition to a standard V
monitor (for power-on reset,
CC
brownout detect, and power-down reset), the devices
include a sophisticated watchdog timer that detects when
the processor is running outside an expected window of
operation for a specific application. The watchdog signals
a fault when the input pulses arrive too early (faster than
outputs will be observed with respect to t
and t
.
WD1
WD2
the selected t
timeout period) or too late (slower than
WD1
After RESET or WDPO deasserts, the first WDI falling
edge is ignored for the fast fault condition (Figure 2).
the selected t
timeout period) (Figure 1). Incorrect
WD2
timing can lead to poor or dangerous system performance
in tightly controlled operating environments. Incorrect
timing could be the result of improper μP clocking or code
execution errors. If a timing error occurs, the MAX6323/
MAX6324 issue a watchdog pulse output, independent
from the reset output, indicating that system maintenance
may be required.
Upon detecting a watchdog fault, the WDPO output
will pulse low for 1ms. WDPO is an open-drain output.
Connect a pullup resistor on WDPO to any supply up to
+6V.
V
Reset
CC
The MAX6323/MAX6324 also include a standard V
CC
Watchdog Function
reset monitor to ensure that the μP is started in a
known state and to prevent code execution errors
during power-up, power-down, or brownout conditions.
A pulse on the watchdog output WDPO can be triggered
by a fast fault or a slow fault. If the watchdog input (WDI)
has two falling edges too close to each other (faster
RESET is asserted whenever the V
supply voltage
CC
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MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
t
< t
(min)
WDI WD1
RESET
WDI
WDPO
FAST FAULT
Figure 2. Fast Fault Timing
t
< t
(max)
WDI WD2
RESET
WDI
WDPO
SLOW FAULT
Figure 3. Slow Fault Timing
t
(max) < t < t (min)
WDI WD2
WD1
RESET
WDI
H
WDPO
L
NORMAL OPERATION (NO PULSING, OUTPUT STAYS HIGH)
Figure 4. Normal Operation, WDPO Not Asserted
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MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
V
TH
V
CC
100ms (min)
100ms (min)
120ns (typ)
20µs (typ)
RESET
MR
1µs (min)
Figure 5. RESET Timing Relationship
falls below the preset threshold or when the manual
Applications Information
reset input (MR) is asserted. The RESET output remains
Negative-Going V
Transients
CC
The MAX6323/MAX6324 are relatively immune to short-
duration negative-going V transients (glitches), which
asserted for at least 100ms after V
has risen above
CC
the reset threshold and MR is deasserted (Figure 5).
For noisy environments, bybass V with a 500pF (min)
CC
CC
usually do not require the entire system to shut down.
Typically, 200ns large-amplitude pulses (from ground
to V ) on the supply will not cause a reset. Lower
CC
amplitude pulses result in greater immunity. Typically,
capacitor to ensure correct operation.
The MAX6323 has a push-pull output stage, and the
MAX6324 utilizes an open-drain output. Connect a
pullup resistor on the RESET output of the MAX6324 to
any supply up to +6V. Select a resistor value large enough
to register a logic low (see Electrical Characteristics) and
small enough to register a logic high while supplying all
input leakage currents and leakage paths connected
to the RESET line. A 10kΩ pullup is sufficient in most
applications.
a V
transient that falls 100mV below the reset
CC
threshold and lasts less than 20μs will not trigger a
reset (see Typical Operating Characteristics). An optional
0.1μF bypass capacitor mounted close to V
additional transient immunity.
provides
CC
Ensuring a Valid Reset Output
Down to V
= 0V
CC
falls below +1.2V, the MAX6323 RESET out-
Manual Reset Input
When V
CC
Many μP-based products require manual reset capability
to allow an operator or external logic circuitry to initiate a
reset. The manual reset input (MR) can connect directly to
a switch without an external pullup resistor or debouncing
put no longer sinks current; it becomes an open circuit.
Therefore, high-impedance CMOS logic inputs connected
to RESET can drift to undetermined voltages. This does
not present a problem in most applications, since most
network. MR is internally pulled up to V
and, there-
CC
μPs and other circuitry are inoperative with V
below
CC
fore, can be left unconnected if unused. MR is designed
to reject fast, negative-going transients (typically 100ns
pulses), and it must be held low for a minimum of 1μs
to assert the reset output (Figure 5). A 0.1μF capacitor
from MR to ground provides additional noise immunity.
After MR transitions from low to high, reset will remain
asserted for the duration of the reset timeout period, at
least 100ms.
+1.2V. However, in applications where RESET must be
valid down to 0, adding a pulldown resistor to RESET
causes any stray leakage currents to flow to ground, hold-
ing RESET low (Figure 6). R1’s value is not critical; 100kΩ
is large enough not to load RESET and small enough to
pull RESET to ground. This scheme does not work with
the open-drain output of the MAX6324.
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MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
V
V
CC
V
CC
V
CC
V
CC
CC
µP
MAX6324
MAX6323
RESET
INPUT
RESET
RESET
R1
100k
GND
GND
GND
Figure 6. RESET Valid to V
= Ground Circuit
Figure 7. Interfacing to μPs with Bidirectional Reset Pins
CC
Interfacing to μPs with
Bidirectional Reset Pins
+3.3V
+5.0V
Since the RESET output on the MAX6324 is open-
drain, this device easily interfaces 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 7).
R
PULLUP
V
V
CC
CC
5V SYSTEM
MAX6324
RESET
INPUT
RESET
MAX6324 Open-Drain RESET Output
Allows Use with Multiple Supplies
GND
GND
Generally, the pullup resistor connected to the MAX6324
will connect to the supply voltage that is being monitored
at the IC’s V
pin. However, some systems may use
CC
the open-drain output to level-shift from the monitored
supply to reset circuitry powered by some other supply
Figure 8. MAX6324 Open-Drain RESET Output Allows Use
with Multiple Supplies
(Figure 8). Keep in mind that as the MAX6324’s V
CC
decreases below +1.2V, so does the IC’s ability to sink
current at RESET. Also, with any pullup resistor, RESET
to be reset within the loop, keeping the watchdog from
timing out.
will be pulled high as V
decays toward 0. The voltage
CC
where this occurs depends on the pullup resistor value
and the voltage to which it is connected.
Figure 9 shows an example of a flow diagram where the
I/O driving the watchdog input is set high at the beginning
of the program, set low at the beginning of every subrou-
tine or loop, then set high again when the program returns
to the beginning. If the program should “hang” in any sub-
routine, the problem would be quickly corrected, since the
I/O is continually set low and the watchdog time is allowed
to time out, causing a reset or interrupt to be issued.
Watchdog Software Considerations
To help the watchdog timer monitor software execution
more closely, set and reset the watchdog input at different
points in the program, rather than “pulsing” the watchdog
input high-low-high or low-high-low. This technique avoids
a “stuck” loop in which the watchdog time would continue
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MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
WDPO to MR Loopback
An error detected by the watchdog often indicates that
a problem has occurred in the μP code execution.
This could be a stalled instruction or a loop from which
the processor cannot free itself. If the μP will still respond
to a nonmaskable input (NMI), the processor can be
redirected to the proper code sequence by connecting the
WDPO output to an NMI input. Internal RAM data should
not be lost, but it may have been contaminated by the
same error that caused the watchdog to time out.
START
SET WDI
LOW
SUBROUTINE OR
PROGRAM LOOP
SET WDI HIGH
If the processor will not recognize NMI inputs, or if the
internal data is considered potentially corrupted when a
watchdog error occurs, the processor should be restarted
with a reset function. To obtain proper reset timing
characteristics, the WDPO output should be connected
to the MR input, and the RESET output should drive the
μP RESET input (Figure 10). The short 1ms WDPO pulse
output will assert the manual reset input and force the
RESET output to assert for the full reset timeout period
(100ms min). All internal RAM data is lost during the reset
period, but the processor is guaranteed to begin in the
proper operating state.
RETURN
END
Figure 9. Watchdog Flow Diagram
V
CC
500pF
V
V
CC
CC
*R
PULLUP
µP
MAX6323
MAX6324
RESET
WDI
RESET
I/O
MR
WDPO
GND
*MAX6324 ONLY
Figure 10. WDPO to MR Loopback Circuit
Maxim Integrated
│ 10
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MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
Standard Versions
Reset Threshold Range
(-40°C to +125°C)
MAX6323AUT29
MAX6323AUT46
MAX6323CUT29
MAX6323CUT46
MAX6323DUT29
MAX6323DUT46
MAX6323HUT29
MAX6323HUT46
MAX6324AUT29
MAX6324AUT46
MAX6324BUT29
MAX6324BUT46
MAX6324EUT29
MAX6324EUT46
MAX6324HUT29
MAX6324HUT46
SUFFIX
46
MIN
4.50
4.25
3.00
2.85
2.55
2.25
TYP
4.63
4.38
3.08
2.93
2.63
2.32
MAX
4.75
4.50
3.15
3.00
2.70
2.38
UNITS
44
31
V
29
26
23
Ordering Information (continued)
Chip Information
TRANSISTOR COUNT: 1371
TEMP
PIN-
RESET
PART
RANGE
PACKAGE OUTPUT
PROCESS: BiCMOS
Open
Drain
MAX6324_UT_ _-T
-40°C to +125°C 6 SOT23
Open
Drain
MAX6324_UT_ _/V+T -40°C to +125°C 6 SOT23
MAX6324HUT44/V+T -40°C to +125°C 6 SOT23
Open
Drain
*These devices are factory trimmed to one of eight watchdog-
timeout windows and one of six reset voltage thresholds. Insert
the letter corresponding to the desired watchdog-timeout window
(A, B, C, D, E, F, G, or H) into the blank following the number
6323 or 6324 (see Watchdog Timeout table). Insert the two-
digit code (46, 44, 31, 29, 26, or 23) after the letters UT for the
desired nominal reset threshold (see Reset Threshold Range
table at end of data sheet).
/V denotes an automotive qualified part.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Note: There are eight standard versions of each device available
(see Standard Versions table). Sample stock is generally held on
standard versions only. Standard versions have an order
increment requirement of 2500 pieces. Nonstandard versions
have an order increment requirement of 10,000 pieces. Contact
factory for availability of nonstandard versions.
Maxim Integrated
│ 11
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MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
Typical Operating Circuit
V
CC
500pF
V
CC
V
CC
*R
PULLUP
µP
MAX6323
MAX6324
RESET
WDI
RESET
I/O
MR
WDPO
NMI
GND
*MAX6324 ONLY
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
21-0058
LAND PATTERN NO.
90-0175
6 SOT23
U6-1
Maxim Integrated
│ 12
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MAX6323/MAX6324
μP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
5
6
7
10/00
5/10
1/11
Initial release
—
Updated the Ordering Information and Absolute Maximum Ratings.
Corrected placement of /V in the Ordering Information section
Updated Features section and Ordering Information table
1, 2, 10
11
3/18
1, 12
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2018 Maxim Integrated Products, Inc.
│ 13
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