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MAX6323CUT29+T ,µP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual ResetFeaturesThe MAX6323/MAX6324 microprocessor (µP) supervi-♦ Min/Max (Windowed) Watchdog, sory circuit ..
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MAX6323CUT29+T
µP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset
General Description
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 RESEToutput is
guaranteed down to VCC= +1.2V.
The RESEToutput is either push-pull (MAX6323) or
open-drain (MAX6324). RESETis asserted low when
VCCfalls below the reset threshold, or when the manual
reset input (MR) is asserted low. RESETremains assert-
ed for at least 100ms after VCCrises above the reset
threshold and MRis deasserted.
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 timeout is measured from the last falling
edge of watchdog input (WDI) with a minimum pulse
width of 300ns. WDPOis asserted for 1ms when a fault
is observed. Eight laser-trimmed timeout periods are
available.
The MAX6323/MAX6324 are offered in a 6-pin SOT23
package and operate over the extended temperature
range (-40°C to +125°C).
Applications
Automotive
Industrial
Medical
Embedded Control Systems
FeaturesMin/Max (Windowed) Watchdog,
8 Factory-Trimmed Timing OptionsPulsed Open-Drain, Active-Low Watchdog OutputPower-On Reset Precision Monitoring of +2.5V, +3.0V, +3.3V,
and +5.0V Power SuppliesOpen-Drain or Push-Pull RESETOutputsLow-Power Operation (23µA typ)Debounced Manual Reset InputGuaranteed Reset Valid to VCC= +1.2V
MAX6323/MAX6324
µP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
GND
VCCWDIMAX6323
MAX6324
SOT23
TOP VIEW
RESETMR
WDPO
19-1838; Rev 6; 1/11
*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 incre-
ment requirement of 2500 pieces. Nonstandard versions have an
order increment requirement of 10,000 pieces. Contact factory for
availability of nonstandard versions.
Pin Configuration
Ordering Information
WATCHDOG TIMEOUT*
SUFFIX
MAX
FAST
UNITS
SLOW
MINUNITS
300s47
Watchdog Timeout
PARTTEMP
RANGE
PIN-
PACKAGE
RESET
OUTPUT
MAX6323_UT_ _-T-40°C to +125°C6 SOT23Push-Pull
Ordering Information continued at end of data sheet.
MAX6323/MAX6324
µP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= full range, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= 3V, TA= +25°C.) (Note 1)
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.
Terminal Voltage (with respect to GND)
VCC..................................................................-0.3V to +6.0VMR, RESET(MAX6323), WDI................-0.3V to (VCC+ 0.3V)
WDPO, RESET(MAX6324)..............................-0.3V to +6.0V
Input Current, VCC, WDI, MR..............................................20mA
Output Current, RESET, WDPO..........................................20mA
Rate of Rise, VCC............................................................100V/µs
Continuous Power Dissipation (TA= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C)..........696mW
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)
Lead(Pb)-Free............................................................+260°C
Containing Lead.........................................................+240°C
PARAMETERSYMBOLMINTYPMAXUNITS
Supply CurrentICC2757µA
Operating Voltage Range 1.25.5VCCV
VCC= 5.5V
VCC= 2.5V or 3.3V23451VRESET= VWDPO= +5.5V, RESET, WDPO
deassertedILKGWDPO, RESETOutput Leakage
VCC- 1.5ISOURCE= 800µA, VCC= 4.75V, RESET
deasserted, (MAX632_ _UT44, MAX632_ _UT46)
VOHRESETOutput Voltage
(MAX6323)
0.8 x VCC
ISOURCE= 500µA, VCC= 3.15V, RESET
deasserted (MAX632_ _UT23, MAX632_ _UT26,
MAX632_ _UT29, MAX632_ _UT31)
0.4ISINK= 100µA, VCC> 1.2V, RESETasserted
VOLWDPO, RESETOutput Voltage
0.4ISINK= 3.2mA, VCC= 4.25V (MAX632_ _UT44,
MAX632_ _UT46)
ISINK= 1.2mA, VCC= 2.25V (MAX632_ _UT23,
MAX632_ _UT26, MAX632_ _UT29,
MAX632_ _UT31)2010mV/ms, VTH+100mV to VTH- 100mVVCCto RESETDelay100180280RESETdeassertedtRPReset Timeout Delay
CONDITIONS
MAX632_ _UT23
VTHReset Threshold Voltage
MAX632_ _UT44
MAX632_ _UT46
No load, RESET
deasserted
2.552.632.70MAX632_ _UT26
2.852.933.00MAX632_ _UT29
3.003.083.15MAX632_ _UT31
Input VoltageMinimum Pulse WidthGlitch Immunityto Reset DelayPullup ResistanceMAX6323/MAX6324
µP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
CONDITIONSUNITSMINTYPMAXSYMBOLPARAMETER
ELECTRICAL CHARACTERISTICS (continued)
(VCC= full range, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= 3V, TA= +25°C.) (Note 1)
Note 1:Devices are tested at TA= +25°C and guaranteed by design for TA= TMINto TMAX, as specified.
Note 2:WDPOwill 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 RESETor WDPOwill not create a fast watchdog
timeout fault.
Note 4:WDPOwill pulse low if no falling edge is detected on WDI after this timeout period expires.
MAX632_AUT_ _11.5
MAX632_BUT_ _1015
MAX632_CUT_ _1015
MAX632_DUT_ _1015
MAX632_EUT_ _1015
MAX632_FUT_ _1723
MAX632_GUT_ _2939
Watchdog Timeout (Fast)
(Notes 2, 3)
MAX632_HUT_ _543719tWD1
MAX632_AUT_ _1015
MAX632_BUT_ _100150
MAX632_CUT_ _300450
MAX632_DUT_ _1015
MAX632_EUT_ _6090s
MAX632_FUT_ _4763
MAX632_GUT_ _82108ms
tWD2
MAX632_HUT_ _1.31.8s
Watchdog Timeout (Slow)
(Note 4)
300ns
WDI Glitch ImmunityVCC= 5.5V100ns
VIH0.75 x VCCWDI Input VoltageVIL0.8V
VWDI= 0V-1.5-1WDI Input CurrentVWDI= VCC11.5µA
VIL= 0.8V, VIH= 0.75V x VCC0.513ms
VIH0.7 x VCC
VIL0.3 x VCCVµs
VCC= 2.5V100ns
VCC= 2.5V120ns85kΩ
Minimum Watchdog Input
Pulse Width
WATCHDOG INPUT AND OUTPUT
MANUAL RESET INPUT
WDPOPulse Width
MAX6323/MAX6324
µP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
MAX6323/24-01
TEMPERATURE (°C)
SUPPLY CURRENT vs. TEMPERATURE
SUPPLY CURRENT (
VCC = 5.5V
VCC = 3.3V
VCC = 1.0V
MAX6323/24-02
TEMPERATURE (°C)
POWER-DOWN RESET DELAY (
POWER-DOWN RESET DELAY
vs. TEMPERATURE
VOD = 20mV
VOD = 100mV
MAX6323/24-04
TEMPERATURE (°C)
RESET THRESHOLD
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
MAX6323/24-05
TEMPERATURE (°C)
POWER-UP RESET TIMEOUT
NORMALIZED POWER-UP RESET TIMEOUT
vs. TEMPERATURE
MAX6323/24-06
TEMPERATURE (°C)
NORMALIZED WATCHDOG TIMEOUT
PERIOD (FAST) vs. TEMPERATURE
NORMALIZED WATCHDOG TIMEOUT PERIOD (FAST)
MAX6323/24-07
NORMALIZED WATCHDOG TIMEOUT
PERIOD (SLOW) vs. TEMPERATURE
NORMALIZED WATCHDOG TIMEOUT PERIOD (SLOW) 0.992
MAX6323/24-08
NORMALIZED WATCHDOG OUTPUT PULSE WIDTH (
NORMALIZED WATCHDOG OUTPUT
PULSE WIDTH vs. TEMPERATURE
VOD = VTH - VCC400
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6323/24-09
MAXIMUM TRANSIENT DURATION (
MAX632_AUT23
RESET ASSERTED
ABOVE THIS LINE
Typical Operating Characteristics
(VCC= full range, TA= +25°C, unless otherwise noted.)
MAX6323/24-03
TEMPERATURE (°C)
MR TO RESET DELAY (ns)
MR TO RESET DELAY
vs. TEMPERATURE
MAX6323/MAX6324
µP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
500μs/div
MAX6323/24-10
WDI2V/div
2V/divWDPO
FAST WATCHDOG TIMEOUT PERIOD
MAX6323AUT23
5ms/div
MAX6323/24-11
WDI2V/div
2V/divWDPO
SLOW WATCHDOG TIMEOUT PERIOD
MAX6323AUT23
Typical Operating Characteristics (continued)
(VCC= full range, TA= +25°C, unless otherwise noted.)
Pin Description
Active-Low. Reset is asserted when VCCdrops below VTHand remains asserted until VCCrises above VTH
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 RESETto any supply voltage up to +6V.
Watchdog Pulse Output. The open-drain WDPOoutput is pulsed low for 1ms (typ) upon detection of a fast
or slow watchdog fault. WDPOis only active when RESETis high.WDPO5
RESET6
Supply Voltage for the Device. Input for VCCreset monitor. For noisy systems, bypass VCCwith a 500pF
(min) capacitor.VCC4
Watchdog Input. The internal watchdog timer clears to zero on the falling edge of WDI or when RESETgoes
high. If WDI sees another falling edge within the factory-trimmed watchdog window, WDPOwill remain
unasserted. Transitions outside this window, either faster or slower, will cause WDPOto pulse low for 1ms
(typ).
WDI3
PIN
GroundGND2
Active-Low, Manual Reset Input. When MRis asserted low, RESETis asserted low, the internal watchdog
timer is reset to zero, and WDPOis reset to high impedance (open drain). After the rising edge of MR,
RESETis asserted for at least 100ms. Leave MRunconnected or connect to VCCif unused.1
FUNCTIONNAME
MAX6323/MAX6324
µP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
Detailed Description
The MAX6323/MAX6324 µP supervisory circuits main-
tain system integrity by alerting the µP to fault condi-
tions. In addition to a standard VCCmonitor (for
power-on reset, brownout detect, and power-down
reset), the devices include a sophisticated watchdog
timer that detects when the processor is running out-
side an expected window of operation for a specific
application. The watchdog signals a fault when the
input pulses arrive too early (faster than the selected
tWD1timeout period) or too late (slower than the select-
ed tWD2timeout period) (Figure 1). Incorrect timing can
lead to poor or dangerous system performance in tight-
ly 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 sys-
tem maintenance may be required.
Watchdog Function
A pulse on the watchdog output WDPOcan be trig-
gered by a fast fault or a slow fault. If the watchdog
other (faster than tWD1) (Figure 2) or falling edges that
are too far apart (slower than tWD2) (Figure 3), WDPOis
pulsed low. Normal watchdog operation is displayed in
Figure 4 (WDPOis not asserted). The internal watch-
dog timer is cleared when a WDI falling edge is detect-
ed within the valid watchdog window or when the
device’s RESETor WDPOoutputs are deasserted. All
WDI input pulses are ignored while either RESETor
WDPOis asserted. Figure 1 identifies the input timing
regions where WDPOfault outputs will be observed
with respect to tWD1and tWD2. After RESETor WDPO
deasserts, the first WDI falling edge is ignored for the
fast fault condition (Figure 2).
Upon detecting a watchdog fault, the WDPOoutput will
pulse low for 1ms. WDPOis an open-drain output.
Connect a pullup resistor on WDPOto any supply up to
+6V.
VCCReset
The MAX6323/MAX6324 also include a standard VCC
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.
*UNDETERMINED STATES MAY OR MAY NOT GENERATE A FAULT CONDITION.
POSSIBLE STATES
GUARANTEED TO
ASSERT WDPO
GUARANTEED TO
ASSERT WDPO
GUARANTEED NOT TO
ASSERT WDPO
FAST FAULTCONDITION 1
SLOW FAULTCONDITION 3
NORMAL OPERATIONCONDITION 2
tWD1 (min)
tWD1 (max)tWD2 (min)tWD2 (max)
*UNDETERMINED *UNDETERMINED
Figure 1. Detailed Watchdog Input Timing Relationship
MAX6323/MAX6324
µP Supervisory Circuits with Windowed
(Min/Max) Watchdog and Manual Reset
RESET
WDPO
WDI
FAST FAULT
tWDI < tWD1 (min)
Figure 2. Fast Fault Timing
RESET
WDPO
WDI
SLOW FAULT
tWDI < tWD2 (max)
Figure 3. Slow Fault Timing
RESET
WDPO
WDI
NORMAL OPERATION (NO PULSING, OUTPUT STAYS HIGH)
tWD1 (max) < tWDI < tWD2 (min)

Partno	Mfg	Dc	Qty	Available	Descript
MAX6323CUT29+T	N/A	N/a	2500	avai	µP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset