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MAX6737XKSFD3-T-MAX6744XKTZD3-T
Vcc1: 4.625 V, Vcc2: 3.075 V, active timeout period: 150 ms-300 ms, low-power dual/triple-voltage mP supervisor circuit
General DescriptionThe MAX6736–MAX6745 are low-power dual-/triple-
voltage microprocessor (µP) supervisors. These
devices assert a reset if any monitored supply falls
below its factory-trimmed or adjustable threshold and
maintain reset for a minimum timeout period after all
supplies rise above their thresholds. The integrated
dual/triple supervisory circuits significantly reduce size
and power compared to separate ICs or discrete com-
ponents. The low supply current of 6µA makes these
devices ideal for portable equipment.
The MAX6736/MAX6737 are dual fixed-voltage µP
supervisors with a manual reset input. The MAX6738/
MAX6739 have one fixed and one adjustable reset
threshold and a manual reset input. The MAX6740/
MAX6743 are triple-voltage µP supervisors with two
fixed and one user-adjustable reset threshold inputs.
The MAX6741/MAX6744 are dual-voltage µP supervi-
sors with a power-OK (POK) output ideal for power-
supply sequencing. The MAX6742/MAX6745 monitor
the primary VCCsupply and have an independent
power-fail comparator.
The MAX6736–MAX6745 monitor I/O supply voltages
(VCC1) from 1.8V to 5.0V and core supply voltages
(VCC2) from 0.9V to 3.3V with factory-trimmed reset
threshold voltage options (Table 1). An external
adjustable RSTIN input option allows monitoring volt-
ages down to 0.5V.
A variety of push-pull or open-drain reset outputs along
with manual reset input and power-fail input/output fea-
tures are available (see the Selector Guide). The
MAX6736–MAX6745 are offered in a space-saving 5-pin
SC70 package and operate over the -40°C to +85°C
temperature range.
Applications
FeaturesDual-/Triple-Supply Reset Voltage MonitorsPrecision Factory-Set Reset Thresholds for
Monitoring from 0.9V to 5.0VAdjustable Reset Input Down to 0.488V150ms and 1200ms (min) Reset Timeout Period
OptionsVCC1 Power-OK Output for Power-Supply
Sequencing Applications (MAX6741/MAX6744)Power-Fail Input/Power-Fail Output
(MAX6742/MAX6745)6µA Supply CurrentTiny SC70 Package
MAX6736–MAX6745
Low-Power Dual-/Triple-Voltage SC70 µP
Supervisory Circuits
Selector Guide
Ordering Information19-2531; Rev 1; 4/03
Note:The first “_ _” or “_” are placeholders for the threshold
voltage levels of the devices. Desired threshold levels are set
by the part number suffix found in Tables 1 and 2. The “_” after
the D is a placeholder for the reset timeout period suffix found
in Table 3. For example, the MAX6736XKLTD3-T is a dual-volt-
age supervisor VTH1 = 4.625V, VTH2 = 3.075V, and a 150ms
minimum reset timeout period. All devices are available in
tape-and-reel only. There is a 2500-piece minimum order
increment for standard versions (see Table 1). Sample stock is
typically held on standard versions only. Nonstandard versions
require a minimum order increment of 10,000 pieces. Contact
factory for availability.
Portable/Battery-
Powered Equipment
Multivoltage Systems
Notebook Computers
Controllers
PDAs
GPS Equipment
POS Equipment
Ordering Information continued at end of data sheet.
Selector Guide continued at end of data sheet.
Pin Configurations appear at end of data sheet.
Typical Application Circuits appear at end of data sheet.
Functional Diagram appears at end of data sheet.
MAX6736–MAX6745
Low-Power Dual-/Triple-Voltage SC70 µP
Supervisory Circuits
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICSStresses 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.
VCC1, VCC2, POK1 to GND......................................-0.3V to +6V
Open-Drain RESET, PFOto GND.............................-0.3V to +6V
Push-Pull RESETto GND..........................-0.3V to (VCC1 + 0.3V)MR, RSTIN, PFI to GND............................-0.3V to (VCC1 + 0.3V)
Input/Output Current, All Pins.............................................20mA
Continuous Power Dissipation (TA= +70°C)
5-Pin SC70 (derate 3.1mW/°C above +70°C)..............247mW
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
MAX6736–MAX6745
Low-Power Dual-/Triple-Voltage SC70 µP
Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
MAX6736–MAX6745
Low-Power Dual-/Triple-Voltage SC70 µP
Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
MAX6736–MAX6745
Low-Power Dual-/Triple-Voltage SC70 µP
Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)(VCC= 1.2V to 5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Note 2:Guaranteed by design.
Note 3:tRDtimeout period begins after POK1 timeout period (tPOKP) and VCC2 ≥VTH2 (max) (MAX6741/MAX6744).
Note 4:Refers to the manual reset function obtained by forcing the RESET output low.
Note 5:VCC1 ≥1.6V.
Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
MAX6736–MAX6745
Low-Power Dual-/Triple-Voltage SC70 µP
Supervisory Circuits
NORMALIZED VCC/POK1/MR
TIMEOUT PERIOD vs. TEMPERATUREMAX6736-45 toc04
TEMPERATURE (°C)
NORMALIZED V
/POK1/MR RESET
TIMEOUT PERIOD40200-20
MAXIMUM VCC1/VCC2 TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6736-45 toc05
RESET THRESHOLD OVERDRIVE (mV)
MAXIMUM V
1/V
2 TRANSIENT DURATION (
10,0001000
NORMALIZED VCC RESET THRESHOLD
vs. TEMPERATUREMAX6736-45 toc06
TEMPERATURE (°C)
NORMALIZED V
RESET THRESHOLD40200-20
VCC TO RESET OUTPUT DELAY
vs. TEMPERATURE
MAX6736-45 toc07
TEMPERATURE (°C)
TO RESET OUTPUT DELAY (40200-20
RESET INPUT TO RESET OUTPUT DELAY
vs. TEMPERATURE
MAX6736-45 toc08
TEMPERATURE (°C)
RSTIN TO RESET OUTPUT DELAY (40200-20
POWER-FAIL INPUT TO POWER-FAIL
OUTPUT DELAY vs. TEMPERATURE
MAX6736-45 toc09
TEMPERATURE (°C)
PFI TO PFO DELAY (40200-20
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
MAX6736–MAX6745
Low-Power Dual-/Triple-Voltage SC70 µP
Supervisory Circuits
Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
MAX6736–MAX6745
Low-Power Dual-/Triple-Voltage SC70 µP
Supervisory Circuits
Pin Description
