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MAX6866UK26D3L-T
1.6 V, 225 ms, nanopower uP supervisory circuit with manual reset and watchdog timer
General DescriptionThe 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 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.
ApplicationsPortable/Battery-Powered Equipment
PDAs/Cell Phones
MP3 Players/Pagers
Glucose Monitors/Patient Monitors
FeaturesUltra-Low 170nA (typ) Supply CurrentReset Thresholds from +1.575V to +4.625V in
Approximately 100mV IncrementsSix Minimum Reset Timeout Period Options from
10ms to 1200msManual 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 RESETNo 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 Timer19-3139; Rev 2; 9/04
Pin Configurations appear at end of data sheet.
Selector Guide appears at end of data sheet.
Typical Operating Circuit
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
MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869
Nanopower µP Supervisory Circuits with
Manual Reset and Watchdog Timer
ELECTRICAL CHARACTERISTICS (continued)
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.
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.)
MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869
Nanopower µP Supervisory Circuits with
Manual Reset and Watchdog Timer
OUTPUT LOW VOLTAGE
vs. SINK CURRENTMAX6854 toc08
ISINK (µA)
(V)
OUTPUT HIGH VOLTAGE
vs. SOURCE CURRENT
MAX6854 toc09
ISOURCE (µA)
OUTPUT HIGH VOLTAGE (V
- V
) (V)
SUPPLY CURRENT vs. WATCHDOG
SWITCHING FREQUENCY
MAX6854 toc10
WATCHDOG SWITCHING FREQUENCY (Hz)
SUPPLY CURRENT (100k10k1k100
0.110M
VCC TO RESET DELAYMAX6854 toc11
10µs/div
200mV/div1.7V
1.5V
VCC
RESET
1V/div
MANUAL RESET DELAYMAX6854 toc12
200ns/div
1V/div
RESET
1V/div
ypical Operating Characteristics (continued)(VCC = +2.5V, TA= +25°C, unless otherwise noted.)
