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MAX6738XKSD3+TMAIXMN/a2500avaiLow-Power Dual-/Triple-Voltage SC70 µP Supervisory Circuits
MAX6740XKWTD3+T |MAX6740XKWTD3TMAXIMN/a2900avaiLow-Power Dual-/Triple-Voltage SC70 µP Supervisory Circuits
MAX6740XKZGD3+TMAXIMN/a89avaiLow-Power Dual-/Triple-Voltage SC70 µP Supervisory Circuits
MAX6743XKSHD3+TMAXIMN/a2200avaiLow-Power Dual-/Triple-Voltage SC70 µP Supervisory Circuits
MAX6736XKTWD7MAXIMN/a126avaiLow-Power Dual-/Triple-Voltage SC70 µP Supervisory Circuits
MAX6740XKVDD3+TMAXIMN/a23094avaiLow-Power Dual-/Triple-Voltage SC70 µP Supervisory Circuits


MAX6740XKVDD3+T ,Low-Power Dual-/Triple-Voltage SC70 µP Supervisory CircuitsMAX6736–MAX674519-2531; Rev 2; 12/05Low-Power Dual-/Triple-Voltage SC70 µPSupervisory Circuits
MAX6740XKWTD3+T ,Low-Power Dual-/Triple-Voltage SC70 µP Supervisory CircuitsFeaturesThe MAX6736–MAX6745 are low-power dual-/triple- ♦ Dual-/Triple-Supply Reset Voltage Monitor ..
MAX6740XKZGD3+T ,Low-Power Dual-/Triple-Voltage SC70 µP Supervisory CircuitsELECTRICAL CHARACTERISTICS(V = 1.2V to 5.5V, T = -40°C to +85°C, unless otherwise noted. Typical va ..
MAX6743XKSHD3+T ,Low-Power Dual-/Triple-Voltage SC70 µP Supervisory CircuitsApplications (MAX6741/MAX6744)devices ideal for portable equipment.♦ Power-Fail Input/Power-Fail Ou ..
MAX6744XKTZD3-T ,Vcc1: 3.075 V, Vcc2: 2.313 V, active timeout period: 150 ms-300 ms, low-power dual/triple-voltage mP supervisor circuitApplicationsOrdering Information continued at end of data sheet.Portable/Battery- ControllersSelect ..
MAX6746KA26+T ,µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout DelayElectrical Characteristics(V = +1.2V to +5.5V, T = T to T , unless otherwise specified. Typical val ..
MB3776 ,Switching Regulator ControllerFEATURES• Wide supply voltage range: (2 V to 15 V)• Wide oscillation frequency range, high-frequenc ..
MB3776A ,Switching Regulator ControllerFUJITSU SEMICONDUCTORDS04-27201-3EDATA SHEETASSP For Power Supply
MB3776AP ,Switching Regulator ControllerFEATURES• Wide supply voltage range: (2 V to 15 V)• Wide oscillation frequency range, high-frequenc ..
MB3776APF ,Switching Regulator ControllerFUJITSU SEMICONDUCTORDS04-27201-3EDATA SHEETASSP For Power Supply
MB3776APFV ,Switching Regulator ControllerFEATURES• Wide supply voltage range: (2 V to 15 V)• Wide oscillation frequency range, high-frequenc ..
MB3776APFV ,Switching Regulator ControllerFUJITSU SEMICONDUCTORDS04-27201-3EDATA SHEETASSP For Power Supply


MAX6736XKTWD7-MAX6738XKSD3+T-MAX6740XKVDD3+T-MAX6740XKWTD3+T-MAX6740XKZGD3+T-MAX6743XKSHD3+T
Low-Power Dual-/Triple-Voltage SC70 µP Supervisory Circuits
General Description
The 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
Features
Dual-/Triple-Supply Reset Voltage MonitorsPrecision Factory-Set Reset Thresholds for
Monitoring from 0.9V to 5.0V
Adjustable Reset Input Down to 0.488V150ms and 1200ms (min) Reset Timeout Period
Options
VCC1 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
PARTVOLTAGE
MONITORS
OPEN-DRAIN

RESET
PUSH-PULL

RESET
MANUAL
RESET
POWER-FAIL
INPUT/
OUTPUT
POK
OUTPUT
RSTIN
INPUT

MAX67362 fixedX—X———
MAX67372 fixed—XX———
MAX67381 fixed, 1 adjX—X——X
Selector Guide
Ordering Information

19-2531; Rev 2; 12/05
PARTTEMP RANGEPIN-PACKAGE
MAX6736XK_ _D_-T
-40°C to +85°C5 SC70-5
MAX6737XK_ _D_-T
-40°C to +85°C5 SC70-5
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.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Portable/Battery-
Powered Equipment
Multivoltage Systems
Notebook Computers
Controllers
PDAs
GPS Equipment
POS Equipment
Ordering Information and Selector Guide continued at end
of data sheet.
Pin Configurations, Typical Application Circuits, and
Functional Diagram appear at end of data sheet.

*Manual reset detect on RESEToutput.
MAX6736–MAX6745
Low-Power Dual-/Triple-Voltage SC70 µP
Supervisory Circuits
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VCC= 1.2V to 5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at 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.
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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

TA = -40°C to 0°C1.25.5Operating Voltage RangeVCC1,
VCC2TA = 0°C to +85°C1.05.5V
VCC1 = 3.3V, VCC1 > VCC2, no load, reset
not asserted510
VCC1 Supply CurrentICC1
VCC1 = 1.8V, VCC1 < VCC2, no load, reset
not asserted510
VCC2 = 1.8V, VCC2 < VCC1, no load, reset
not asserted12
VCC2 Supply CurrentICC2
VCC2 = 3.3V, VCC2 > VCC1, no load, reset
not asserted1020
TA = 0°C to +85°C4.5004.6254.750MAX67_ _LTA = -40°C to +85°C4.4254.825
TA = 0°C to +85°C4.2504.3754.500MAX67_ _MTA = -40°C to +85°C4.1754.575
TA = 0°C to +85°C3.0003.0753.150MAX67_ _TTA = -40°C to +85°C2.9503.200
TA = 0°C to +85°C2.8502.9253.000MAX67_ _STA = -40°C to +85°C2.8003.050
TA = 0°C to +85°C2.5502.6252.700MAX67_ _RTA = -40°C to +85°C2.5052.745
TA = 0°C to +85°C2.2502.3132.375MAX67_ _ZTA = -40°C to +85°C2.2132.413
TA = 0°C to +85°C2.1252.1882.250MAX67_ _YTA = -40°C to +85°C2.0882.288
TA = 0°C to +85°C1.6201.6651.710MAX67_ _WTA = -40°C to +85°C1.5931.737
TA = 0°C to +85°C1.5301.5751.620
Reset Threshold for VCC1VTH1
MAX67_ _VTA = -40°C to +85°C1.5031.647
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)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

TA = 0°C to +85°C3.0003.0753.150MAX67_ _TTA = -40°C to +85°C2.9053.050
TA = 0°C to +85°C2.8502.9253.000MAX67_ _STA = -40°C to +85°C2.8003.050
TA = 0°C to +85°C2.5502.6252.700MAX67_ _RTA = -40°C to +85°C2.5052.745
TA = 0°C to +85°C2.2502.3132.375MAX67_ _ZTA = -40°C to +85°C2.2132.413
TA = 0°C to +85°C2.1252.1882.250MAX67_ _YTA = -40°C to +85°C2.0882.288
TA = 0°C to +85°C1.6201.6651.710MAX67_ _WTA = -40°C to +85°C1.5931.737
TA = 0°C to +85°C1.5301.5751.620MAX67_ _VTA = -40°C to +85°C1.5031.647
TA = 0°C to +85°C1.3501.3881.425MAX67_ _ITA = -40°C to +85°C1.3281.448
TA = 0°C to +85°C1.2751.3131.350MAX67_ _HTA = -40°C to +85°C1.2531.373
TA = 0°C to +85°C1.0801.1101.140MAX67_ _GTA = -40°C to +85°C1.0621.158
TA = 0°C to +85°C1.0201.0501.080MAX67_ _FTA = -40°C to +85°C1.0021.098
TA = 0°C to +85°C0.8100.8330.855MAX67_ _ETA = -40°C to +85°C0.7970.869
TA = 0°C to + 85°C0.7650.7880.810
Reset Threshold for VCC2VTH2
MAX67_ _DTA = -40°C to +85°C0.7520.824
TA = 0°C to +85°C0.4760.4880.500RSTIN Threshold (MAX6738/
MAX6739/MAX6740/MAX6743)VTH-RSTINTA = -40°C to +85°C0.4680.507V
RSTIN Input CurrentVRSTIN ≥ 0.1V (Note 2)-10+10nA
Reset Threshold HysteresisVTH1, VTH2, RSTIN, PFI0.5%
VCC1 ≥ 1.0V, ISINK = 50µA, TA = 0°C to
+85°C0.3
VCC1 ≥ 1.2V, ISINK = 100µA0.3
VCC1 ≥ 2.13V, ISINK = 1.2mA0.3
RESET, POK1 Output LowVOL
VCC1 ≥ 4.25V, ISINK = 3.2mA,0.4
VCC1 ≥ 2.38V, ISOURCE = 500µA, output
deasserted
0.8 ×
VCC
RESET Output High (Push-Pull)VOH
VCC1 ≥ 4.75V, ISOURCE = 800µA, output
deasserted
0.8 ×
VCC
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)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

RESET Output Open-Drain
Leakage Current
(MAX6736/MAX6738)
ILKGOutput not asserted low (Note 2)500nA
POK1 Output Open-Drain
LeakageOutput not asserted low (Note 2)500nA
VCC Reset DelaytRDVCC1, VCC2, or RSTIN falling at 10mV/µs
from VTH + 100mV to VTH - 100mV35µs
MAX67_ _ _ _ XK_ _D3150225300VCC Reset Timeout Period
(Note 3)tRPMAX67_ _ _ _ XK_ _ D7120018002400ms
MANUAL RESET (MAX6736–MAX6739 only)

MR to VCC1 Internal Pullup
Impedance0.751.53.00kΩ
MR Timeout PeriodtMRPBoth D3 and D7 timing options150225300ms
MR Minimum Input Pulse WidthtMPW1µs
MR Glitch Rejection100ns
VIL0.3 ×
VCC1
MR Input Voltage
VIH0.8 ×
VCC1
MR to RESET Delay300ns
VCC1 POWER-OK OUTPUT (MAX6741/MAX6744 only)

POK1 Timeout PeriodtPOKP37.556.2575.0ms
PUSHBUTTON RESET (MAX6740/MAX6741/MAX6742 only)

RESET to VCC1 Internal Pullup
Impedance2550100kΩ
Manual Reset Detect Debounce
PeriodtDEB(Note 4)37.556.2575.0ms
MAX67_ _ _ _ XK_ _D3150225300Manual Reset Timeout
Period (Note 3)tMRPMAX67_ _ _ _ XK_ _ D7120018002400ms
Manual Reset Minimum Input
Pulse WidthtMPW(Note 4)1µs
Manual Reset Release Detect
Threshold(Note 4)0.5 ×
VCC1V
Manual Reset Glitch Rejection(Note 4)100ns
Manual Reset to RESET Delay300ns
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)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
POWER-FAIL COMPARATOR (MAX6742/MAX6745 only)

TA = 0°C to +85°C0.4760.4880.500Power Fail In Threshold (Note 5)VTH-PFITA = -40°C to +85°C0.4680.507V
Power Fail In CurrentIPFIVPFI ≥ 0.1V (Note 2)-10+10nA
VCC1 ≥ 1.53V, ISINK = 500µA0.3
VCC1 ≥ 2.03V, ISINK = 1.2mA0.3PFO Output LowVOL
VCC1 ≥ 4.25V, ISINK = 3.2mA0.4
PFI to PFO Propagation DelaytP
PFI falling at 10mV/µs from VTH-PFI +
100mV to VTH-PFI - 100mV or rising at
10mV/µs from VTH-PFI - 100mV to VTH-PFI +
100mV (Note 5)µs
PFO Startup DelayTo output valid (Note 5)5ms
Note 1:
All devices are 100% tested at TA= +25°C. All temperature limits are guaranteed by design.
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.)
SUPPLY CURRENT vs. TEMPERATURE

MAX6736-45 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (40200-20
VCC1 = 3.3V, VCC2 = 2.5V
TOTAL
ICC1
ICC2
SUPPLY CURRENT vs. TEMPERATURE

MAX6736-45 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (40200-20
VCC1 = 2.5V, VCC2 = 1.8V
TOTAL
ICC1
ICC2
SUPPLY CURRENT vs. TEMPERATURE

MAX6736-45 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (40200-20
VCC1 = 1.8V, VCC2 = 1.2V
TOTAL
ICC1
ICC2
MAX6736–MAX6745
Low-Power Dual-/Triple-Voltage SC70 µP
Supervisory Circuits
NORMALIZED VCC/POK1/MR
TIMEOUT PERIOD vs. TEMPERATURE

MAX6736-45 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
VCC1
VCC2
RESET OCCURS ABOVE
THESE LINES
NORMALIZED VCC RESET THRESHOLD
vs. TEMPERATURE

MAX6736-45 toc06
TEMPERATURE (°C)
NORMALIZED V
RESET THRESHOLD40200-20
NORMALIZED TO +25°C
VCC TO RESET OUTPUT DELAY
vs. TEMPERATURE

MAX6736-45 toc07
TEMPERATURE (°C)
TO RESET OUTPUT DELAY (40200-20
100mV OVERDRIVE
RESET INPUT TO RESET OUTPUT DELAY
vs. TEMPERATURE

MAX6736-45 toc08
TEMPERATURE (°C)
RSTIN TO RESET OUTPUT DELAY (40200-20
100mV OVERDRIVE
POWER-FAIL INPUT TO POWER-FAIL
OUTPUT DELAY vs. TEMPERATURE

MAX6736-45 toc09
TEMPERATURE (°C)
PFI TO PFO DELAY (40200-20
100mV OVERDRIVE
RISING EDGE
FALLING EDGE
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.)
MR TO RESET OUTPUT DELAY

MAX6736-45 toc10
100ns/div
VMR
2V/div
VRESET
2V/div
POWER-FAIL INPUT TO
POWER-FAIL OUTPUT DELAY

MAX6736-45 toc11
10μs/div
PFI
200mV/div
PFO
2V/div
VCC TO RESET OUTPUT DELAY

MAX6736-45 toc12
4μs/div
VCC
200mV/div
AC-COUPLED
VRESET
2V/div
OUTPUT LOW VOLTAGE
vs. SINK CURRENT
MAX6736-45 toc13
SINK CURRENT (mA)
OUTPUT LOW VOLTAGE (mV)
VCC = 3.3V0.501.001.500.250.751.251.752.00
OUTPUT HIGH VOLTAGE
vs. SOURCE CURRENT

MAX6736-45 toc14
SOURCING CURRENT (mA)
OUTPUT HIGH VOLTAGE (V)
VCC = 3.3V
MAX6736–MAX6745
Low-Power Dual-/Triple-Voltage SC70 µP
Supervisory Circuits
Pin Description
PIN
MAX6736
MAX6737
MAX6738
MAX6739
MAX6740
MAX6743
MAX6741
MAX6744
MAX6742
MAX6745
NAMEFUNCTION

11111RESET
Reset Output, Push-Pull or Open Drain Active Low. RESET
changes from high to low when any monitored power-supply
input (VCC1, VCC2, RSTIN) drops below its selected reset
threshold. It remains low until all monitored power-supply
inputs exceed their selected reset thresholds for the VCC
reset timeout period. RESET is forced low if MR is low for at
least the MR minimum input pulse width. It remains low for
the MR reset timeout period after MR goes high. The push-
pull output is referenced to VCC1. The MAX6736/MAX6738
open-drain outputs require an external pullup resistor. The
MAX6740/MAX6741/MAX6742 open-drain outputs have an
internal 50kΩ pullup resistor to VCC1 and provide a manual
reset function.
22222GNDGround———MR
Manual Reset, Active Low. Pull low for at least MR minimum
input pulse width to force RESET low. Reset remains active
as long as MR is low and for the MR reset timeout period
after MR goes high. There is an internal 1.5kΩ pullup resistor
to VCC1.44—VCC2Voltage Input 1. Power supply and input for the secondary
µP voltage reset monitor.3——RSTIN
Adjustable Reset Threshold Input. RESET is asserted when
RSTIN is below the internal 0.488V reference level. Set the
adjustable reset threshold with an external resistor-divider
network. Connect RSTIN to VCC1 if unused.
55555VCC1Voltage Input 2. Power supply and input for the primary µP
voltage reset monitor.
————4PFI
Power-Fail Comparator Input. PFO is asserted when PFI is
below 0.488V. PFO is deasserted without any reset timeout
period when PFI goes above 0.488V. Connect PFI to an
external resistor network to set the desired monitor
threshold.
————3PFOPower-Fail Comparator Output, Open Drain Active Low. PFO
is asserted when PFI is below 0.488V.
———3—POK1
VCC1 Power-OK Output, Open Drain Active High. POK1
remains low as long as VCC1 is below VTH1. POK1 output
goes high after VCC1 exceeds VTH1 for the POK1 timeout
period. POK1 logic is independent of the MR or VCC2 inputs.
The output can be used to control VCC1-to-VCC2 supply
sequencing.
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