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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6862 Datasheet

Nanopower uP Supervisory Circuits

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19-3139; Rev 4; 12/05
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
VCC
MANUAL
RESET
Typical Operating Circuit
VCC
RESET
MAX6864
MAX6867
MR WDI
GND
0.1µF
VCC
RESET
µP
I/O
GND
Features
Ultra-Low 170nA (typ) Supply Current
Reset Thresholds from +1.575V to +4.625V in
Approximately 100mV Increments
Six Minimum Reset Timeout Period Options from
10ms to 1200ms
Manual Reset Option
Watchdog Timer Option
Pin-Selectable 10ms/150ms (min) Reset Timeout
Period (MAX6861/MAX6862/MAX6863)
Immune to Short VCC Transients
Guaranteed Reset Valid to VCC = +1.1V
Three Reset Output Options:
Push-Pull RESET
Push-Pull RESET
Open-Drain RESET
No External Components
Small 5-Pin SOT23 Package
Pin Compatible to the TPS3836/TPS3837/TPS3838
(MAX6861/MAX6862/MAX6863)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX6854UK_ _D_-T
-40°C to +85°C 5 SOT23-5
MAX6855UK_ _D_-T
-40°C to +85°C 5 SOT23-5
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.
Ordering Information continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6862 Datasheet

Nanopower uP Supervisory Circuits

No Preview Available !

Nanopower µP Supervisory Circuits with
Manual Reset and Watchdog Timer
ABSOLUTE MAXIMUM RATINGS
VCC, Open-Drain RESET to 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
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
(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)
PARAMETER
Supply Voltage
Supply Current
VCC Reset Threshold
SYMBOL
VCC
ICC
CONDITIONS
TA 0°C
TA = -40°C to +85°C
VCC > VTH, no load,
reset output
deasserted (Note 2)
VCC = 5.0V
VCC = 3.3V
VCC = 1.8V
VCC < VTH, no load, reset output asserted
VTH VCC falling (see Table 2)
MIN
1.1
1.2
VTH -
2.5%
TYP
210
190
170
7
VTH
MAX
5.5
5.5
400
380
370
15
VTH +
2.5%
UNITS
V
nA
µA
V
Reset Threshold Hysteresis
Reset Timeout Period
VHYST
tRP
Reset asserted to reset deasserted
D1
D2
VCC = VTH + 150mV D3
(Figures 2 and 3)
D4
D5
D6
10
40
150
1200
300
600
0.5
15
60
225
1800
450
900
25
80
300
2400
600
1200
%VTH
ms
VCC to Reset Delay
tRD
VCC falling from (VTH + 100mV) to
(VTH - 100mV) at 10mV/µs
40 µs
VCC 1.1V, ISINK = 50µA,
RESET asserted, TA 0°C
0.3
VOL
VCC 1.2V, ISINK = 100µA,
RESET asserted
0.3
RESET Output Voltage
VCC 2.12V, ISINK = 1.2mA,
RESET asserted
0.3 V
VOH
VCC 1.71V, ISOURCE = 200µA,
RESET deasserted, push-pull RESET only
VCC 2.38V, ISOURCE = 500µA,
RESET deasserted, push-pull RESET only
0.8 x VCC
0.8 x VCC
Open-Drain RESET Leakage
Current
ILKG RESET deasserted
25 nA
2 _______________________________________________________________________________________


Part Number MAX6862
Description Nanopower uP Supervisory Circuits
Maker Maxim
Total Page 17 Pages
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