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MAX6854UK29D3+TMAXIMN/a1110avaiNanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer
MAX6856UK31D3+TMAXIMN/a2500avaiNanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer
MAX6866UK16D3S+T |MAX6866UK16D3STMAXIMN/a10000avaiNanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer
MAX6866UK23D3L+TN/AN/a2500avaiNanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer
MAX6866UK29D3S+TMAXIMN/a2500avaiNanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer
MAX6866UK43D3S+T |MAX6866UK43D3STMAXIMN/a10000avaiNanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer
MAX6866UK46D3S+TMAXICN/a2500avaiNanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer


MAX6866UK16D3S+T ,Nanopower µP Supervisory Circuits with Manual Reset and Watchdog TimerELECTRICAL CHARACTERISTICS(V = 1.2V to 5.5V, T = -40°C to +85°C, unless otherwise specified. Typica ..
MAX6866UK23D3L+T ,Nanopower µP Supervisory Circuits with Manual Reset and Watchdog TimerFeaturesThe MAX6854/MAX6855/MAX6856/MAX6858/MAX6860– ♦ Ultra-Low 170nA (typ) Supply CurrentMAX6869 ..
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MAX6866UK29D3S+T ,Nanopower µP Supervisory Circuits with Manual Reset and Watchdog TimerApplicationsMAX6854UK_ _D_-T -40°C to +85°C 5 SOT23-5Portable/Battery-Powered EquipmentMAX6855UK_ _ ..
MAX6866UK43D3S+T ,Nanopower µP Supervisory Circuits with Manual Reset and Watchdog TimerApplicationsMAX6854UK_ _D_-T -40°C to +85°C 5 SOT23-5Portable/Battery-Powered EquipmentMAX6855UK_ _ ..
MAX6866UK46D3S+T ,Nanopower µP Supervisory Circuits with Manual Reset and Watchdog TimerFeaturesThe MAX6854/MAX6855/MAX6856/MAX6858/MAX6860– ♦ Ultra-Low 170nA (typ) Supply CurrentMAX6869 ..
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MAX6854UK29D3+T-MAX6856UK31D3+T-MAX6866UK16D3S+T-MAX6866UK23D3L+T-MAX6866UK29D3S+T-MAX6866UK43D3S+T-MAX6866UK46D3S+T
Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer
General Description
The MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–
MAX6869 ultra-low-current (170nA, typ) microprocessor
(µP) supervisory circuits combine voltage monitoring,
watchdog timer, and manual reset input functions in a 5-
pin SOT23 package. These devices assert a reset signal
whenever the monitored voltage drops below the factory-
trimmed reset threshold voltage, manual reset is assert-
ed, or the watchdog timer expires. The reset output
remains asserted for a minimum timeout period after VCC
rises above the reset threshold and manual reset is
deasserted. Factory-trimmed reset threshold voltages
are offered from +1.575V to +4.625V in approximately
100mV increments (see the Threshold Suffix Guide).
Each device is offered with six minimum reset timeout
options, ranging from 10ms to 1200ms.
The MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–
MAX6869 are offered in a variety of configurations (see
the Selector Guide). The MAX6854/MAX6855/MAX6856/
MAX6861–MAX6869 provide a manual reset input, MR.
The MAX6864–MAX6869 offer a watchdog timer that
monitors activity at the WDI input to prevent code execu-
tion errors. The MAX6864–MAX6869 offer watchdog
timeout options of 3.3s or 209s (typ). The MAX6861/
MAX6862/MAX6863 feature a pin-selectable reset delay
period of 10ms or 150ms (min). Push-pull active-low,
push-pull active-high, and open-drain active-low reset
outputs are available.
Applications

Portable/Battery-Powered Equipment
PDAs/Cell Phones
MP3 Players/Pagers
Glucose Monitors/Patient Monitors
Features
Ultra-Low 170nA (typ) Supply CurrentReset Thresholds from +1.575V to +4.625V in
Approximately 100mV Increments
Six Minimum Reset Timeout Period Options from
10ms to 1200ms
Manual Reset OptionWatchdog Timer OptionPin-Selectable 10ms/150ms (min) Reset Timeout
Period (MAX6861/MAX6862/MAX6863)
Immune to Short VCCTransientsGuaranteed Reset Valid to VCC= +1.1VThree Reset Output Options:
Push-Pull RESET
Push-Pull RESET
Open-Drain RESET
No External ComponentsSmall 5-Pin SOT23 PackagePin Compatible to the TPS3836/TPS3837/TPS3838
(MAX6861/MAX6862/MAX6863)
MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869
Nanopower µP Supervisory Circuits with
Manual Reset and Watchdog Timer
Ordering Information
PART†TEMP RANGEPIN-PACKAGE
MAX6854UK_ _D_-T
-40°C to +85°C5 SOT23-5
MAX6855UK_ _D_-T
-40°C to +85°C5 SOT23-5
19-3139; Rev 4; 12/05
Ordering Information continued at end of data sheet.

†Insert reset threshold suffix (see Table 2, Threshold Suffix
Guide) after UK. Insert the number corresponding to the
desired reset timeout period (see Table 4, Reset Timeout
Period) after D.
Note:
Sample stock is generally held on standard versions
only (see Table 5, Standard Versions Table). Standard versions
have an order increment of 2500 pieces. Nonstandard versions
have an order increment of 10,000 pieces. Contact factory for
availability of nonstandard versions.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Pin Configurations and Selector Guide appear at end of
data sheet.ypical Operating Circuit

MAX6864
MAX6867
VCC
VCC
GNDGND
MANUAL
RESET
RESET
I/O
VCC
0.1μF
RESETWDI
MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869
Nanopower µP Supervisory Circuits with
Manual Reset and Watchdog Timer
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VCC= 1.2V to 5.5V, TA= -40°C to +85°C, unless otherwise specified. Typical values are at VCC= 2.5V, 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.
VCC, Open-Drain RESETto GND..........................-0.3V to +6.0V
MR, Push-Pull RESET, RESET,
WDI, CT, I.C............................................-0.3V to (VCC+ 0.3V)
Input Current, Output Current (all pins)............................±20mA
Continuous Power Dissipation (TA= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

TA ≥ 0°C1.15.5Supply VoltageVCCTA = -40°C to +85°C1.25.5V
VCC = 5.0V210400
VCC = 3.3V190380
VCC > VTH, no load,
reset output
deasserted (Note 2)VCC = 1.8V170370Supply CurrentICC
VCC < VTH, no load, reset output asserted715µA
VCC Reset ThresholdVTHVCC falling (see Table 2)VTH -
2.5%VTHVTH +
2.5%V
Reset Threshold HysteresisVHYSTReset asserted to reset deasserted0.5%VTH101525406080150225300120018002400300450600
Reset Timeout PeriodtRPVCC = VTH + 150mV
(Figures 2 and 3)6009001200
VCC to Reset DelaytRDVCC falling from (VTH + 100mV) to
(VTH - 100mV) at 10mV/µs40µs
VCC ≥ 1.1V, ISINK = 50µA,
RESET asserted, TA ≥ 0°C0.3
VCC ≥ 1.2V, ISINK = 100µA,
RESET asserted0.3VOL
VCC ≥ 2.12V, ISINK = 1.2mA,
RESET asserted0.3
VCC ≥ 1.71V, ISOURCE = 200µA,
RESET deasserted, push-pull RESET only0.8 x VCC
RESET Output Voltage
VOH
VCC ≥ 2.38V, ISOURCE = 500µA,
RESET deasserted, push-pull RESET only0.8 x VCC
Open-Drain RESET Leakage
CurrentILKGRESET deasserted25nA
MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869
Nanopower µP Supervisory Circuits with
Manual Reset and Watchdog Timer
ELECTRICAL CHARACTERISTICS (continued)

(VCC= 1.2V to 5.5V, TA= -40°C to +85°C, unless otherwise specified. Typical values are at VCC= 2.5V, TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

VCC ≥ 1.1V, ISOURCE = 10µA,
RESET asserted, TA ≥ 0°C0.8 x VCC
VCC ≥ 1.2V, ISOURCE = 10µA,
RESET asserted0.8 x VCC
VCC ≥ 1.53V, ISOURCE = 200µA,
RESET asserted0.8 x VCC
VOH
VCC ≥ 2.12V, ISOURCE = 500µA,
RESET asserted0.8 x VCC
VCC ≥ 1.71V, ISINK = 500µA,
RESET deasserted0.3
RESET Output Voltage
VOL
VCC ≥ 2.38V, ISINK = 1.2mA,
RESET deasserted0.3
CT Input CurrentCT = GND or VCC20nA
VIH0.8 x VCCCT Input VoltageVIL0.2 x VCCV
MANUAL RESET INPUT

VIH0.7 x VCCMR Input VoltageVIL0.3 x VCCV
MR Minimum Pulse WidthtMPW1µs
MR Glitch Rejection200ns
MR to Reset DelaytMRD250ns
MR Pullup Resistance51020kΩ
WATCHDOG TIMER (MAX6864–MAX6869)

VIH0.7 x VCCWDI Input VoltageVIL0.3 x VCCV
WDI Input CurrentWDI = GND or VCC20nA
WDI Pulse WidthtWDI(Note 3)150ns1.53.37.75Watchdog Timeout PeriodtWDL95209487s
Note 1:
Devices are tested at TA= +25°C. Specifications for TA= -40°C to +85°C are guaranteed by design.
Note 2:
For the MAX6864–MAX6869, the watchdog period is 1s with tRISEand tFALL< 50ns.
Note 3:
Guaranteed by design.
NORMALIZED WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE

MAX6854 toc04
TEMPERATURE (°C)
NORMALIZED t3510-15
MAXIMUM VCC TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX684 toc05
RESET THRESHOLD OVERDRIVE (mV)
TRANSIENT DURATION (
RESET OCCURS ABOVE THIS LINE
VCC FALLING FROM VTH +100mV
NORMALIZED RESET THRESHOLD VOLTAGE
vs. TEMPERATURE

MAX6854 toc06
TEMPERATURE (°C)
NORMALIZED V3510-15
VCC TO RESET DELAY
vs. TEMPERATURE
MAX6854 toc07
TEMPERATURE (°C)
tRD3510-15
VCC = VTH + 100mV TO VTH - 100mV
MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869
Nanopower µP Supervisory Circuits with
Manual Reset and Watchdog Timer
Typical Operating Characteristics

(VCC = +2.5V, TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE

MAX6854 toc01
VCC (V)
ICC
VTH = 2.23V
TA = +85°C
TA = +25°C
TA = -40°C
SUPPLY CURRENT
vs. TEMPERATURE

MAX6854 toc02
TEMPERATURE (°C)
ICC3510-15
RESET IS NOT ASSERTED
VTH = 1.575V
VCC = 5.5V
VCC = 2.5V
VCC = 3.3V
VCC = 1.8V
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE

MAX6854 toc03
TEMPERATURE (°C)
NORMALIZED t3510-15
-4085
MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869
Nanopower µP Supervisory Circuits with
Manual Reset and Watchdog Timer
OUTPUT LOW VOLTAGE
vs. SINK CURRENT

MAX6854 toc08
ISINK (μA)
(V)
VCC = 1.8V
VCC = 3.3V
VCC = 2.5V
OUTPUT HIGH VOLTAGE
vs. SOURCE CURRENT

MAX6854 toc09
ISOURCE (μA)
OUTPUT HIGH VOLTAGE (V
- V
) (V)
VCC = 1.8V
VCC = 3.3V
VCC = 2.5V
SUPPLY CURRENT vs. WATCHDOG
SWITCHING FREQUENCY

MAX6854 toc10
WATCHDOG SWITCHING FREQUENCY (Hz)
SUPPLY CURRENT (100k10k1k100
0.110M
VCC = 2.5V
VCC TO RESET DELAY

MAX6854 toc11
10μs/div
200mV/div1.7V
1.5V
VCC
RESET
1V/div
VTH = 1.575V
tRD
MANUAL RESET DELAY

MAX6854 toc12
200ns/div
1V/div
RESET
1V/div
tMRD ypical Operating Characteristics (continued)
(VCC = +2.5V, TA= +25°C, unless otherwise noted.)
MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869
Nanopower µP Supervisory Circuits with
Manual Reset and Watchdog Timer
MAX6854/MAX6855/MAX6856 Pin Description
PIN
MAX6854/
MAX6856MAX6855NAMEFUNCTION
RESET
Active-Low Open-Drain or Push-Pull Reset Output. RESET transitions from high to
low when VCC drops below the selected reset threshold or MR is pulled low.
RESET remains low for the reset timeout period after VCC exceeds the device
reset threshold and MR deasserts. Push-pull RESET outputs are referenced to
VCC. Open-drain RESET outputs require an external pullup resistor.
2, 42, 4GNDGround. Connect all GND inputs to the same potential.MR
Active-Low Manual Reset Input. Drive MR low to initiate a reset. The reset output
remains asserted while MR is held low and for the reset timeout period after MR
transitions high. Leave MR unconnected or connect to VCC if unused. MR is
internally pulled up to VCC through 10kΩ.VCCSupply Voltage. Input for VCC reset monitor. For noisy systems, bypass VCC with
a 0.1µF capacitor to GND.RESET
Active-High Push-Pull Reset Output. RESET transitions from low to high when
VCC drops below the selected reset threshold or MR is pulled low. RESET
remains high for the reset timeout period after VCC exceeds the device reset
threshold and MR deasserts. RESET is referenced to VCC.
MAX6858/MAX6860 Pin Description
PIN
MAX6858/
MAX6860
NAMEFUNCTION

1, 2I.C.Internally Connected. For increased noise immunity, connect I.C. to GND.GNDGroundRESET
Active-Low Open-Drain or Push-Pull Reset Output. RESET transitions from high to low when VCC
drops below the selected reset threshold. RESET remains low for the reset timeout period after
VCC exceeds the device reset threshold. Push-pull RESET outputs are referenced to VCC. Open-
drain RESET outputs require an external pullup resistor.
5VCCSupply Voltage. Input for VCC reset monitor. For noisy systems, bypass VCC with a 0.1µF
capacitor to GND.
MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869
Nanopower µP Supervisory Circuits with
Manual Reset and Watchdog Timer
MAX6861/MAX6862/MAX6863 Pin Description
PIN
MAX6861/
MAX6863MAX6862NAMEFUNCTION
CT
Reset Timeout Select Input. Connect CT low to select the D1 reset timeout output
period (see Tables 1 and 4). Connect CT high (normally VCC) to select the D3
reset timeout period.GNDGroundMR
Active-Low Manual Reset Input. Drive MR low to initiate a reset. The reset output
remains asserted while MR is held low and for the reset timeout period after MR
transitions high. Leave MR unconnected or connect to VCC if unused. MR is
internally pulled up to VCC through 10kΩ.RESET
Active-Low Open-Drain or Push-Pull Reset Output. RESET transitions from high to
low when VCC drops below the selected reset threshold or MR is pulled low.
RESET remains low for the reset timeout period after VCC exceeds the device
reset threshold and MR deasserts. Push-pull RESET outputs are referenced to
VCC. Open-drain RESET outputs require an external pullup resistor.VCCSupply Voltage. Input for VCC reset monitor. For noisy systems, bypass VCC with
a 0.1µF capacitor to GND.RESET
Active-High Push-Pull Reset Output. RESET transitions from low to high when
VCC drops below the selected reset threshold or MR is pulled low. RESET
remains high for the reset timeout period after VCC exceeds the device reset
threshold and MR deasserts. RESET is referenced to VCC.
MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869
Nanopower µP Supervisory Circuits with
Manual Reset and Watchdog Timer
MAX6864/MAX6865/MAX6866 Pin Description
PIN
MAX6864/
MAX6866MAX6865NAMEFUNCTION
RESET
Active-Low Open-Drain or Push-Pull Reset Output. RESET transitions from high to
low when VCC drops below the selected reset threshold, MR is pulled low, or the
watchdog timer expires. RESET remains low for the reset timeout period after
VCC exceeds the device reset threshold, MR deasserts, or after the watchog
timer expires. Push-pull RESET outputs are referenced to VCC. Open-drain
RESET outputs require an external pullup resistor.GNDGroundMR
Active-Low Manual Reset Input. Drive MR low to initiate a reset. The reset output
remains asserted while MR is held low and for the reset timeout period after MR
transitions high. Leave MR unconnected or connect to VCC if unused. MR is
internally pulled up to VCC through 10kΩ.WDI
Watchdog Input. If WDI remains high or low for longer than the watchdog timeout
period, the internal watchdog timer expires, and a reset is triggered for the reset
timeout period. The internal watchdog timer clears whenever reset is asserted,
the manual reset is asserted, or WDI sees a rising or falling edge.VCCSupply Voltage. Input for VCC reset monitor. For noisy systems, bypass VCC with
a 0.1µF capacitor to GND.RESET
Active-High Push-Pull Reset Output. RESET transitions from low to high when
VCC drops below the selected reset threshold, MR is pulled low, or the watchdog
timer expires. RESET remains high for the reset timeout period after VCC exceeds
the device reset threshold, MR deasserts, or after the watchdog timer expires.
RESET is referenced to VCC.
MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869
Nanopower µP Supervisory Circuits with
Manual Reset and Watchdog Timer
MAX6867/MAX6868/MAX6869 Pin Description
PIN
MAX6867/
MAX6869MAX6868
NAMEFUNCTION
WDI
Watchdog Input. If WDI remains high or low for longer than the watchdog timeout
period, the internal watchdog timer expires, and a reset is triggered for the reset
timeout period. The internal watchdog timer clears whenever reset is asserted,
the manual reset is asserted, or WDI sees a rising or falling edge.GNDGroundMR
Active-Low Manual Reset Input. Drive MR low to initiate a reset. The reset output
remains asserted while MR is held low and for the reset timeout period after MR
transitions high. Leave MR unconnected or connect to VCC if unused. MR is
internally pulled up to VCC through 10kΩ.RESET
Active-Low Open-Drain or Push-Pull Reset Output. RESET transitions from high to
low when VCC drops below the selected reset threshold, MR is pulled low, or the
watchdog timer expires. RESET remains low for the reset timeout period after
VCC exceeds the device reset threshold, MR deasserts, or after the watchdog
timer expires. Push-pull RESET outputs are referenced to VCC. Open-drain
RESET outputs require an external pullup resistor.VCCSupply Voltage. Input for VCC reset monitor. For noisy systems, bypass VCC with
a 0.1µF capacitor to GND.RESET
Active-High Push-Pull Reset Output. RESET transitions from low to high when
VCC drops below the selected reset threshold, MR is pulled low, or the watchdog
timer expires. RESET remains high for the reset timeout period after VCC
exceeds the device reset threshold, MR deasserts, or after the watchdog timer
expires. RESET is referenced to VCC.
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