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MAX6301CSA+ |MAX6301CSAMAXIMN/a335avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6301CSA+T |MAX6301CSATMAXIMN/a5000avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6301CUA+ |MAX6301CUAMAXIMN/a800avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6301ESA+ |MAX6301ESAMAXIMN/a4120avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6301ESA+T |MAX6301ESATMAXN/a1598avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6301ESA+T |MAX6301ESATMAXIMN/a12500avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6301ESA-T |MAX6301ESATMAXIM,MAXIMN/a25000avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6301ESA-T |MAX6301ESATMAXIMN/a125avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6302CSA+ |MAX6302CSAMAXIMN/a15avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6302CUA+ |MAX6302CUAMAXIMN/a180avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6302ESA+ |MAX6302ESAMAXIMN/a6avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6303CSA+ |MAX6303CSAMAXIMN/a119avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6303CSA+T |MAX6303CSATMAXIMN/a878avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6303CSA-T |MAX6303CSATMAXIMN/a73avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6303CUA+ |MAX6303CUAMAXIMN/a2900avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6303CUA-T |MAX6303CUATMAXIMN/a15avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6303ESA+MAXIMN/a725avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6303ESA+ |MAX6303ESAMAXINN/a60avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6303ESA+T |MAX6303ESATMAXN/a976avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6304CSA+ |MAX6304CSAMAXIMN/a30avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6304CUA+ |MAX6304CUAMAXIMN/a180avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6304ESA+ |MAX6304ESAMAXIMN/a40avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
MAX6304ESA+T |MAX6304ESATMAXIMN/a6919avai+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog


MAX6301ESA-T ,+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/WatchdogApplications♦ PDIP/SO/µMAX Packages AvailableMedical Equipment Embedded ControllersIntelligent Inst ..
MAX6301ESA-T ,+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/WatchdogGeneral Description ________
MAX6302CPA ,+5V, Low-Power uP Supervisory Circuits with Adjustable Reset/WatchdogMAX6301–MAX6304 19-1078; Rev 0; 6/96+5V, Low-Power µP Supervisory Circuits with Adjustable Reset/Wa ..
MAX6302CSA ,+5V, Low-Power uP Supervisory Circuits with Adjustable Reset/WatchdogELECTRICAL CHARACTERISTICS(V = +2V to +5.5V, T = T to T , unless otherwise noted. Typical values ar ..
MAX6302CSA+ ,+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/WatchdogELECTRICAL CHARACTERISTICS(V = +2V to +5.5V, T = T to T , unless otherwise noted. Typical values ar ..
MAX6302CUA+ ,+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/WatchdogApplications♦ PDIP/SO/µMAX Packages AvailableMedical Equipment Embedded ControllersIntelligent Inst ..
MB14LPT , SINGLE-PHASE SURFACE MOUNT BRIDGE RECTIFIER
MB1501 ,SERIAL INPUT PLL FREQUENCY SYNTHESIZERSeptember 1995Edition 6.0aDATA SHEETMB1501/MB1501H/MB1501LSERIAL INPUT PLL FREQUENCY SYNTHESIZERSER ..
MB1502 ,SERIAL INPUT PLL FREQUENCY SYNTHESIZERFEATURES• High operating frequency: f =1.1GHz (V =10dBm)IN MAX IN MIN• Pulse swallow function: 64/6 ..
MB1502 ,SERIAL INPUT PLL FREQUENCY SYNTHESIZERNovember 1990Edition 5.0DATA SHEETMB1502SERIAL INPUT PLL FREQUENCY SYNTHESIZERLOW POWER SERIAL INPU ..
MB1502P ,Serial input PLL frequency synthesizerFEATURES• High operating frequency: f =1.1GHz (V =10dBm)IN MAX IN MIN• Pulse swallow function: 64/6 ..
MB1502PF ,Serial input PLL frequency synthesizerNovember 1990Edition 5.0DATA SHEETMB1502SERIAL INPUT PLL FREQUENCY SYNTHESIZERLOW POWER SERIAL INPU ..


MAX6301CSA+-MAX6301CSA+T-MAX6301CUA+-MAX6301ESA+-MAX6301ESA+T-MAX6301ESA-T-MAX6302CSA+-MAX6302CUA+-MAX6302ESA+-MAX6303CSA+-MAX6303CSA+T-MAX6303CSA-T-MAX6303CUA+-MAX6303CUA-T-MAX6303ESA+-MAX6303ESA+T-MAX6304CSA+-MAX6304CUA+-MAX6304ESA+-MAX6304ESA+T
+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
_______________General Description
The MAX6301–MAX6304* low-power microprocessor
(µP) supervisory circuits provide maximum adjustability
for reset and watchdog functions. The reset threshold
can be adjusted to any voltage above 1.22V, using
external resistors. In addition, the reset and watchdog
timeout periods are adjustable using external capaci-
tors. A watchdog select pin extends the watchdog time-
out period to 500x. The reset function features immunity
to power-supply transients.
These four devices differ only in the structure of their reset
outputs (see the Selector Guide). The MAX6301–MAX6304
are available in the space-saving 8-pin µMAX®package,
as well as 8-pin PDIP and SO packages.
Applications

Medical EquipmentEmbedded Controllers
Intelligent InstrumentsCritical µP Monitoring
Portable EquipmentSet-Top Boxes
Battery-Powered Computers
Computers/Controllers
____________________________Features
Adjustable Reset ThresholdAdjustable Reset TimeoutAdjustable Watchdog Timeout500x Watchdog Timeout Multiplier4µA Supply CurrentRESET or RESETOutput OptionsPush-Pull or Open-Drain Output OptionsGuaranteed RESETAsserted At or Above
VCC= 1V (MAX6301/MAX6303)
Power-Supply Transient ImmunityWatchdog Function can be DisabledPDIP/SO/µMAX Packages Available
MAX6301–MAX6304
+5V, Low-Power µP Supervisory Circuits
with Adjustable Reset/Watchdog

0.1μF
MAX6301
MAX6302
MAX6303
MAX6304
VCCRESET IN
VIN
CSWTCSRT
SRT
GND
SWT
WDI
WDS
RESET
I/O
RESET
(RESET)
MAX6301
ONLY
MAX6302
ONLY
WDS = 0 FOR NORMAL MODE
WDS = 1 FOR EXTENDED MODE( ) ARE FOR MAX6302/MAX6304.
Pin Configuration

VCC
RESET (RESET)
WDI
WDS
RESET IN
GND
SRT
SWT
MAX6301
MAX6302
MAX6303
MAX6304
DIP/SO/μMAX

TOP VIEW
( ) ARE FOR MAX6302/MAX6304.
Typical Operating Circuit

19-1078; Rev 4; 9/10
Ordering Information
Ordering Information continued at end of data sheet.
Selector Guide
FEATUREMAX6301MAX6302MAX6303MAX6304

Acti ve-Low
Reset√—√—
Acti ve-H i g h
Reset—√—√
Op en- D rai n
Reset Outp ut√√——ush- P ul l
Reset Outp ut——√√i n- P ackag e8- PD IP /S O/
µM AX
8- PD IP /S O/
µM AX
8- PD IP /S O/
µM AX
8- PD IP /S O/
µM AX
PARTTEMP RANGEPIN-PACKAGE
MAX6301CPA
0°C to +70°C8 PDIP
MAX6301CSA0°C to +70°C8 SO
MAX6301CUA0°C to +70°C8 µMAX
MAX6301EPA-40°C to +85°C8 PDIP
MAX6301ESA-40°C to +85°C8 SO
Devices are available in both leaded and lead(Pb)-free/RoHS-
compliant packaging. Specify lead-free by adding the “+”
symbol at the end of the part number when ordering.
MAX6301–MAX6304
+5V, Low-Power µP Supervisory Circuits
with Adjustable Reset/Watchdog
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VCC= +2V to +5.5V, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°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.
VCC....................................................................................-0.3V to +7.0V
RESET IN, SWT, SRT..................................-0.3V to (VCC+ 0.3V)
WDI, WDS..............................................................-0.3V to +7.0V
RESET, RESET
MAX6301….......................................................-0.3V to +7.0V
MAX6302/MAX6303/MAX6304...............-0.3V to (VCC+ 0.3V)
Input Current
VCC...............................................................................±20mA
GND..............................................................................±20mA
Output Current
RESET, RESET..............................................................±20mA
Continuous Power Dissipation (TA= +70°C)
PDIP (derate 9.09mW/°C above +70°C)......................727mW
SO (derate 5.88mW/°C above +70°C).........................471mW
µMAX (derate 4.10mW/°C above +70°C)....................330mW
Operating Temperature Range
MAX630_C_A......................................................0°C to +70°C
MAX630_E_A...................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow)
Lead(Pb)-free...............................................................+260°C
Containing Lead (Pb)...................................................+240°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

MAX6301C/MAX6303C1.005.50
MAX6301E/MAX6303E1.205.50Operating Voltage Range
(Note 1)VCC
MAX6302/MAX63041.315.50
Supply Current (Note 2)ICCNo load4.07.0µA
RESET TIMER

VRESET IN falling, VCC = 5.0V1.1951.2201.245Reset Input Threshold VoltageVTHVRESET IN rising, VCC = 5.0V1.2401.265V
Reset Input HysteresisVHYST20mV
Reset Input Leakage CurrentIRESET IN±0.01±1nA
VCC ≥ 4.5V, ISOURCE = 0.8mAVCC - 0.4
VCC = 2V, ISOURCE = 0.4mAVCC - 0.4Reset Output-Voltage High
(MAX6302/MAX6303/MAX6304)VOH
MAX6302/MAX6304, VCC = 1.31V,
RL = 10kΩ
VCC -
VCC ≥ 4.5V, ISINK = 3.2mA0.4
VCC = 2V, ISINK = 1.6mA0.4
VCC = 1V, ISINK = 50µA,
TA = 0°C to +70°C0.3
Reset Output-Voltage Low
(MAX6301/MAX6303/MAX6304VOL
MAX6301/
MAX6303VCC = 1.2V, ISINK = 100µA,
TA = -40°C to +85°C0.3
VCC to Reset DelaytRDVCC = falling at 1mV/µs63µs
Reset Input Pulse WidthtRIComparator overdrive = 50mV26µs
Reset Timeout Period (Note 3)tRPCSRT = 1500pF2.84.05.2ms
MAX6301, VRESET = VCC±1Reset Output Leakage CurrentMAX6302, VRESET = VGND±1µA
MAX6301–MAX6304
+5V, Low-Power µP Supervisory Circuits
with Adjustable Reset/Watchdog

10,000
RESET TIMEOUT PERIOD
vs. CSRT
MAX6301-4 toc01
CSRT (nF)
RESET TIMEOUT PERIOD (ms)
VCC = 5V10,000
EXTENDED-MODE
WATCHDOG TIMEOUT PERIOD vs. CSWT
(WDS = VCC)
MAX6301-4 toc02
CSWT (nF)
WATCHDOG TIMEOUT PERIOD (s)
VCC = 5V10,000
NORMAL-MODE
WATCHDOG TIMEOUT PERIOD vs. CSWT
(WDS = GND)
MAX6301-4 toc03
CSWT (nF)
WATCHDOG TIMEOUT PERIOD (ms)
VCC = 5V
ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2V to +5.5V, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.)
Note 1:
Reset is guaranteed valid from the selected reset threshold voltage down to the minimum VCC.
Note 2:
WDS = VCC, WDI unconnected.
Note 3:
Precision timing currents of 500nA are present at both the SRT and SWT pins. Timing capacitors connected to these nodes
must have low leakage consistent with these currents to prevent timing errors.
Note 4:
The sink/source is supplied through a resistor, and is proportional to VCC(Figure 8). At VCC= 2V, it is typically ±24µA.
__________________________________________Typical Operating Characteristics

(CSWT= CSRT= 1500pF, TA= +25°C, unless otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
WATCHDOG TIMER

VIH0.7 x VCCWDI, WDS Input ThresholdVIL0.3 x VCCV
VCC = 4.5V to 5.5V30WDI Pulse WidthtWPVCC = 2V to 4.5V60ns
WDI, WDS Leakage CurrentExtended mode disabled±1µA
WDI Sink/Source Current (Note 4)Extended mode enabled±70µA
WDS = GND, CSWT = 1500pF2.84.05.2msWatchdog Timeout Period
(Note 3)tWDWDS = VCC, CSWT = 1500pF1.42.02.6s
MAX6301–MAX6304
+5V, Low-Power µP Supervisory Circuits
with Adjustable Reset/Watchdog
____________________________Typical Operating Characteristics (continued)

(CSWT= CSRT= 1500pF, TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
MAX6301-4 toc07
TEMPERATURE (°C)
SUPPLY CURRENT (
VCC = 5.0V
VCC = 2.0V
RESET DEASSERTED
NO LOAD
RESET IN THRESHOLD VOLTAGE
vs. TEMPERATURE
MAX6301-4 toc08
TEMPERATURE (°C)
RESET REFERENCE VOLTAGE (V)
VCC TO RESET DELAY
vs. TEMPERATURE (VCC FALLING)
MAX6301-4 toc09
PROPAGATION DELAY (
VCC FALLING AT 1mV/μs
RESET AND WATCHDOG
TIMEOUT vs. SUPPLY VOLTAGE

MAX6301-4 toc10
tRP
(ms)546
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6301-4 toc04
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
RESET DEASSERTED
NO LOAD
RESET AND NORMAL-MODE
WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE
MAX6301-4 toc05
TEMPERATURE (°C)
tRP
(ms)
4.15VCC = 5.0V2004006001000800
MAX6301-4 toc06
RESET THRESHOLD OVERDRIVE (mV)
TRANSIENT DURATION (
RESET OCCURS
ABOVE THE CURVE
SEE THE NEGATIVE-GOING
VCC TRANSIENTS SECTION
VRST = 4.60V
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE (VRST)
MAX6301–MAX6304
+5V, Low-Power µP Supervisory Circuits
with Adjustable Reset/Watchdog
Pin Description
PINNAMEFUNCTION
RESET IN
Reset Input. High-impedance input to the reset comparator. Connect this pin to the center point of an
external resistor voltage-divider network to set the reset threshold voltage. The reset threshold voltage is
calculated as follows: VRST = 1.22 x (R1 + R2)/R2 (see the Typical Operating Circuit).GNDGroundSRT
Set Reset-Timeout Input. Connect a capacitor between this input and ground to select the reset timeout
period (tRP). Determine the period as follows: tRP = 2.67 x CSRT, with CSRT in pF and tRP in µs (see the
Typical Operating Circuit).
4SWT
Set Watchdog-Timeout Input. Connect a capacitor between this input and ground to select the basic
watchdog timeout period (tWD). Determine the period as follows: tWD = 2.67 x CSWT, with CSWT in pF and
tWD in µs. The watchdog function can be disabled by connecting this pin to ground.WDS
Watchdog-Select Input. This input selects the watchdog mode. Connect to ground to select normal mode
and the basic watchdog timeout period. Connect to VCC to select extended mode, multiplying the basic
timeout period by a factor of 500. A change in the state of this pin resets the watchdog timer to zero.WDI
Watchdog Input. A rising or falling transition must occur on this input within the selected watchdog timeout
period, or a reset pulse will occur. The capacitor value selected for SWT and the state of WDS determine
the watchdog timeout period. The watchdog timer clears and restarts when a transition occurs on WDI or
WDS. The watchdog timer is cleared when reset is asserted and restarted after reset deasserts. In the
extended watchdog mode (WDS = VCC), the watchdog function can be disabled by driving WDI with a
three-stated driver or by leaving WDI unconnected.
Open-Drain, Active-Low Reset
Output (MAX6301)RESET
(MAX6301/
MAX6303)Push-Pull, Active-Low Reset
Output (MAX6303)
RESET changes from high to low whenever the monitored voltage (VIN)
drops below the selected reset threshold (VRST). RESET remains low as
long as VIN is below VRST. Once VIN exceeds VRST, RESET remains low
for the reset timeout period and then goes high. The watchdog timer
triggers a reset pulse (tRP) whenever the watchdog timeout period (tWD)
is exceeded.
Open-Drain, Active-High Reset
Output (MAX6302)
RESET
(MAX6302/
MAX6304Push-Pull, Active-High Reset
Output (MAX6304)
RESET changes from low to high whenever the monitored voltage (VIN)
drops below the selected reset threshold (VRST). RESET remains high as
long as VIN is below VRST. Once VIN exceeds VRST, RESET remains high
for the reset timeout period and then goes low. The watchdog timer
triggers a reset pulse (tRP) whenever the watchdog timeout period (tWD)
is exceeded.
8VCCSupply Voltage. Bypass to ground with a 0.1µF capacitor placed as close as possible to the pin.
Detailed Description
Reset Function/Output

The reset output is typically connected to the reset input
of a µP. A µP’s reset input starts or restarts the µP in a
known state. The MAX6301–MAX6304 µP supervisory
circuits provide the reset logic to prevent code-execution
errors during power-up, power-down, and brownout
conditions (see the Typical Operating Circuit).
For the MAX6301/MAX6303, RESETchanges from high
to low whenever the monitored voltage (VIN) drops
below the reset threshold voltage (VRST). RESET
remains low as long as VINis below VRST. Once VIN
exceeds VRST, RESETremains low for the reset timeout
period, then goes high. When a reset is asserted due to
a watchdog timeout condition, RESETstays low for the
reset timeout period. Any time reset asserts, the watch-
dog timer clears. At the end of the reset timeout period,
RESETgoes high and the watchdog timer is restarted
from zero. If the watchdog timeout period is exceeded
again, then RESETgoes low again. This cycle contin-
ues unless WDI receives a transition.
On power-up, once VCCreaches 1V, RESETis guaran-
teed to be a logic-low. For information about applica-
tions where VCCis less than 1V, see the Ensuring a
Valid RESET/RESET Output Down to VCC= 0V (MAX6303/
MAX6304) section. As VCCrises, RESETremains low.
When VINrises above VRST, the reset timer starts and
RESETremains low. When the reset timeout period
ends, RESETgoes high.
On power-down, once VINgoes below VRST, RESET
goes low and is guaranteed to be low until VCCdrops
below 1V. For information about applications where
VCCis less than 1V, see the Ensuring a Valid
RESET/RESET Output Down to VCC= 0V (MAX6303/
MAX6304)section.
The MAX6302/MAX6304 active-high RESET output is
the inverse of the MAX6301/MAX6303 active-low
RESEToutput, and is guaranteed valid for VCC> 1.31V.
Reset Threshold

These supervisors monitor the voltage on RESET IN.
The MAX6301–MAX6304 have an adjustable reset
threshold voltage (VRST) set with an external resistor
voltage-divider (Figure 1). Use the following formula to
calculate VRST(the point at which the monitored voltage
triggers a reset):
where VRSTis the desired reset threshold voltage and
and R2 can have very high values to minimize current
consumption. Set R2 to some conveniently high value
(1MΩ, for example) and calculate R1 based on the desired
reset threshold voltage, using the following formula:
Watchdog Timer

The watchdog circuit monitors the µP’s activity. If the µP
does not toggle the watchdog input (WDI) within tWD
(user selected), reset asserts. The internal watchdog
timer is cleared by reset, by a transition at WDI (which
can detect pulses as short as 30ns), or by a transition
at WDS. The watchdog timer remains cleared while
reset is asserted; as soon as reset is released, the timer
starts counting (Figure 2).
The MAX6301–MAX6304 feature two modes of watchdog
timer operation: normal mode and extended mode. In
normal mode (WDS = GND), the watchdog timeout
period is determined by the value of the capacitor con-
nected between SWT and ground (see the Selecting
the Reset and Watchdog Timeout Capacitorsection). In
extended mode (WDS = VCC), the watchdog timeout
period is multiplied by 500. For example, in the extended
mode, a 1µF capacitor gives a watchdog timeout period
of 22 minutes (see the Extended-Mode Watchdog
Timeout Period vs. CSWTgraph in the Typical
Operating Characteristics).
In extended mode, the watchdog function can be
disabled by leaving WDI unconnected or by three-stating
the driver connected to WDI. In this mode, the watchdog
input is internally driven low during the watchdog timeoutR2V1RST=×−⎛⎜⎞⎟() ΩVR1R2 VRST=×+()()
0.1µF
MAX6301
MAX6302
MAX6303
MAX6304
VCCRESET IN
VIN
VRST = 1.22 (R1 + R2)R2
MAX6301–MAX6304
+5V, Low-Power µP Supervisory Circuits
with Adjustable Reset/Watchdog

Figure 1. Calculating the Reset Threshold Voltage (VRST)
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