MAX6720UTSYD3+T ,Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory CircuitsMAX6715–MAX672919-2325; Rev 5; 12/05Dual/Triple Ultra-Low-Voltage SOT23 µPSupervisory Circuits
MAX6721UTVDD3-T ,Vcc1: 1.575 V, Vcc2: 0.788 V, active timeout period: 140 ms-280 ms, dual/triple ultra-low-voltage SOT23 mP supervisor circuitfeatures are available (see Selector Guide). Select reset Immune to Short V Transientstimeout peri ..
MAX6725AKASHD3+ ,Dual/Triple, Ultra-Low-Voltage, SOT23 µP Supervisory CircuitsApplicationsMAX6718AUK_ _D_+T -40°C to +125°C 5 SOT23● Multivoltage Systems ● Industrial Equipment● ..
MAX6730UTRD3 ,Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog OutputApplications● Multivoltage SystemsWDO NMIPUSHBUTTON● Telecom/Networking EquipmentMRSWITCH● Computer ..
MAX6730UTRD3 ,Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog OutputElectrical Characteristics(V 1 = V 2 = +0.8V to +5.5V, T = -40°C to +85°C, unless otherwise noted. ..
MAX6731UTTD3+ ,Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Outputfeatures Down to +0.63V (MAX6734/MAX6735 Only)significantly improves system reliability and accurac ..
MB3775 ,SWITCHING REGULATOR CONTROLLERFUJITSU SEMICONDUCTORDS04-27204-3EDATA SHEETASSPSWITCHING REGULATOR CONTROLLERMB3775LOW VOLTAGE DUA ..
MB3775PF , SWITCHING REGULATOR CONTROLLER
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
MAX6716UTVDD3+T-MAX6719UTTGD3+T-MAX6719UTTZD3+T-MAX6720UTSVD3+T-MAX6720UTSYD3+T
Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits
General DescriptionThe MAX6715–MAX6729 are ultra-low-voltage microproces-
sor (µP) supervisory circuits designed to monitor two or three
system power-supply voltages. These devices assert a sys-
tem 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 sig-
nificantly improve system reliability and reduce size com-
pared to separate ICs or discrete components.
These devices monitor primary supply voltages (VCC1) from
1.8V to 5.0V and secondary supply voltages (VCC2) from
0.9V to 3.3V with factory-trimmed reset threshold voltage
options (see Reset Voltage Threshold Suffix Guide). An
externally adjustable RSTIN input option allows customers to
monitor a third supply voltage down to 0.62V. These devices
are guaranteed to be in the correct reset output logic state
when either VCC1 or VCC2 remains greater than 0.8V.
A variety of push-pull or open-drain reset outputs along with
watchdog input, manual reset input, and power-fail input/out-
put features are available (see Selector Guide). Select reset
timeout periods from 1.1ms to 1120ms (min) (see Reset
Timeout Period Suffix Guide). The MAX6715–MAX6729 are
available in small 5, 6, and 8-pin SOT23 packages and oper-
ate over the -40°C to +85°C temperature range.
ApplicationsMultivoltage Systems
Telecom/Networking Equipment
Computers/Servers
Portable/Battery-Operated Equipment
Industrial Equipment
Printer/Fax
Set-Top Boxes
FeaturesVCC1 (primary supply) Reset Threshold Voltages
from 1.58V to 4.63VVCC2 (secondary supply) Reset Threshold
Voltages from 0.79V to 3.08VExternally Adjustable RSTIN Threshold for
Auxiliary/Triple-Voltage Monitoring
(0.62V internal reference)Watchdog Timer Option
35s (min) Long Startup Period
1.12s (min) Normal Timeout PeriodManual Reset Input OptionPower-Fail Input/Power-Fail Output Option
(Push-Pull and Open-Drain Active-Low)Guaranteed Reset Valid Down to VCC1 or
VCC2 = 0.8V Reset Output Logic OptionsImmune to Short VCCTransientsLow Supply Current 14µA (typ) at 3.6VSmall 5, 6, and 8-Pin SOT23 Packages
MAX6715–MAX6729
Dual/Triple Ultra-Low-Voltage SOT23 µP
Supervisory Circuits
Ordering InformationOUT2
OUT1
DC/DC
CONVERTERUNREGULATED
VCC1VCC2
RSTIN/PFI
RST
WDI
PFO
MAX67_ _PUSHBUTTON
SWITCH
I/O
SUPPLY
CORE
SUPPLY
RESET
I/O
NMI
1.8V0.9V
Typical Operating Circuit19-2325; Rev 5; 12/05
Pin Configurations and Selector Guide appear at end of
data sheet.
PARTTEMP RANGEPIN-PACKAGEMAX6715UT_ _D_ -T -40°C to +85°C 6 SOT23-6
MAX6716UT_ _D_ -T -40°C to +85°C 6 SOT23-6
MAX6717UK_ _D_ -T -40°C to +85°C 5 SOT23-5
MAX6718UK_ _D_ -T -40°C to +85°C 5 SOT23-5
MAX6719UT_ _D_ -T -40°C to +85°C 6 SOT23-6
MAX6720UT_ _D_ -T -40°C to +85°C 6 SOT23-6
Note:The first “_ _” are placeholders for the threshold voltage
levels of the devices. Desired threshold levels are set by the part
number suffix found in the Reset Voltage Threshold Suffix Guide.
The “_” after the D is a placeholder for the reset timeout delay
time. Desired delay time is set using the timeout period suffix
found in the Reset Timeout Period Suffix Guide. For example the
MAX6716UTLTD3-T is a dual-voltage supervisor VTH1 = 4.625V,
VTH2 = 3.075V, and 210ms (typ) timeout period.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing "-T" with "+T" when ordering.
Ordering Information continued at end of data sheet.
MAX6715–MAX6729
Dual/Triple Ultra-Low-Voltage SOT23 µP
Supervisory Circuits
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC1 = VCC2 = 0.8V to 5.5V, GND = 0, 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.
Terminal Voltage (with respect to GND)
VCC1, VCC2..........................................................-0.3V to +6V
Open-Drain RST, RST1, RST2, PFO, RST................-0.3V to +6V
Push-Pull RST, RST1, PFO, RST...............-0.3V to (VCC1 + 0.3V)
Push-Pull RST2.........................................-0.3V to (VCC2 + 0.3V)
RSTIN, PFI, MR, WDI................................................-0.3V to +6V
Input Current/Output Current (all pins)...............................20mA
Continuous Power Dissipation (TA= +70°C)
5-Pin SOT23-5 (derate 7.1mW/°C above +70°C)........571mW
6-Pin SOT23-6 (derate 8.7mW/°C above +70°C)........696mW
8-Pin SOT23-8 (derate 8.9mW/°C above +70°C)........714mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply VoltageVCC0.85.5V
VCC1 < 5.5V, all I/O pins open1539ICC1VCC1 < 3.6V, all I/O pins open1028
VCC2 < 3.6V, all I/O pins open411Supply Current
ICC2VCC2 < 2.75V, all I/O pins open39
L (falling)4.5004.6254.750
M (falling)4.2504.3754.500
T (falling)3.0003.0753.150
S (falling)2.8502.9253.000
R (falling)2.5502.6252.700
Z (falling)2.2502.3132.375
Y (falling)2.1252.1882.250
W (falling)1.6201.6651.710
VCC1 Reset ThresholdVTH1
V (falling)1.5301.5751.620
T (falling)3.0003.0753.150
S (falling)2.8502.9253.000
R (falling)2.5502.6252.700
Z (falling)2.2502.3132.375
Y (falling)2.1252.1882.250
W (falling)1.6201.6651.710
V (falling)1.5301.5751.620
I (falling)1.3501.3881.425
H (falling)1.2751.3131.350
G (falling)1.0801.1101.140
F (falling)1.0201.0501.080
E (falling)0.8100.8330.855
VCC2 Reset ThresholdVTH2
D (falling)0.7650.7880.810
Reset Threshold Tempco20ppm/°C
Reset Threshold HysteresisVHYSTReferenced to VTH typical0.5%
MAX6715–MAX6729
Dual/Triple Ultra-Low-Voltage SOT23 µP
Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)(VCC1 = VCC2 = 0.8V to 5.5V, GND = 0, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSVCC to Reset Output DelaytRDV C C 1 = ( V TH 1 + 100m V ) to ( V TH 1 - 100m V ) or C C 2 = ( V TH 2 + 75m V ) to ( V TH 2 -
75m V ) 20µs1.11.652.28.813.217.61402102802804205605608401120
Reset Timeout PeriodtRP112016802240
ADJUSTABLE RESET COMPARATOR INPUT (MAX6719/MAX6720/MAX6723–MAX6727)RSTIN Input ThresholdVRSTIN611626.5642mV
RSTIN Input CurrentIRSTIN-25+25nA
RSTIN Hysteresis3mV
RSTIN to Reset Output DelaytRSTINDVRSTIN to (VRSTIN - 30mV)22µs
POWER-FAIL INPUT (MAX6728/MAX6729)PFI Input ThresholdVPFI611626.5642mV
PFI Input CurrentIPFI-25+25nA
PFI HysteresisVPFH3mV
PFI to PFO DelaytDPF(VPFI + 30mV) to (VPFI - 30mV)2µs
MANUAL RESET INPUT (MAX6715–MAX6722/MAX6725–MAX6729)VIL0.3 ✕ VCC1MR Input VoltageVIH0.7 ✕ VCC1V
MR Minimum Pulse Width1µs
MR Glitch Rejection100ns
MR to Reset DelaytMR200ns
MR Pullup Resistance255080kΩ
WATCHDOG INPUT (MAX6721–MAX6729)First watchdog period after reset timeout
period355472Watchdog Timeout PeriodtWD
Normal mode1.121.682.24
WDI Pulse WidthtWDI(Note 2)50ns
VIL0.3 ✕ VCC1WDI Input VoltageVIH0.7 ✕ VCC1V
WDI Input CurrentIWDIWDI = 0 or VCC1-1+1µA
MAX6715–MAX6729
Dual/Triple Ultra-Low-Voltage SOT23 µP
Supervisory Circuits
Note 1:Devices tested at +25°C. Overtemperature limits are guaranteed by design and not production tested.
Note 2:Parameter guaranteed by design.
ELECTRICAL CHARACTERISTICS (continued)(VCC1 = VCC2 = 0.8V to 5.5V, GND = 0, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
RESET/POWER-FAIL OUTPUTSVCC1 or VCC2 ≥ 0.8V, ISINK = 1µA,
output asserted0.3
VCC1 or VCC2 ≥ 1.0V, ISINK = 50µA,
output asserted0.3
VCC1 or VCC2 ≥ 1.2V, ISINK = 100µA,
output asserted0.3
VCC1 or VCC2 ≥ 2.7V, ISINK = 1.2mA,
output asserted0.3
RST/RST1/RST2/PFO
Output LOW
(Push-Pull or Open-Drain)
VOL
VCC1 or VCC2 ≥ 4.5V, ISINK = 3.2mA,
output asserted0.4
VCC1 ≥ 1.8V, ISOURCE = 200µA, output not
asserted0.8 ✕ VCC1
VCC1 ≥ 2.7V, ISOURCE = 500µA, output not
asserted0.8 ✕ VCC1
RST/RST1/PFO
Output HIGH
(Push-Pull Only)
VOH
VCC1 ≥ 4.5V, ISOURCE = 800µA, output not
asserted0.8 ✕ VCC1
VCC2 ≥ 1.8V, ISOURCE = 200µA, output not
asserted0.8 ✕ VCC2
VCC2 ≥ 2.7V, ISOURCE = 500µA, output not
asserted0.8 ✕ VCC2
RST2
Output HIGH
(Push-Pull Only)
VOH
VCC2 ≥ 4.5V, ISOURCE = 800µA, output not
asserted0.8 ✕ VCC2
VCC1 ≥ 1.0V, ISOURCE = 1µA, reset asserted0.8 ✕ VCC1
VCC1 ≥ 1.8V, ISOURCE = 150µA,
reset asserted0.8 ✕ VCC1
VCC1 ≥ 2.7V, ISOURCE = 500µA,
reset asserted0.8 ✕ VCC1
RST
Output HIGH
(Push-Pull Only)
VOH
VCC1 ≥ 4.5V, ISOURCE = 800µA,
reset asserted0.8 ✕ VCC1
VCC1 or VCC2 ≥ 1.8V, ISINK = 500µA,
reset not asserted0.3
VCC1 or VCC2 ≥ 2.7V, ISINK = 1.2mA,
reset not asserted0.3
RST
Output LOW
(Push-Pull or Open Drain)
VOL
VCC1 or VCC2 ≥ 4.5V, ISINK = 3.2mA,
reset not asserted0.4
RST/RST1/RST2/PFO Output
Open-Drain Leakage CurrentOutput not asserted0.5µA
RST Output Open-Drain
Leakage CurrentOutput asserted0.5µA
MAX6715–MAX6729
Dual/Triple Ultra-Low-Voltage SOT23 µP
Supervisory CircuitsSUPPLY CURRENT vs. TEMPERATURE
VCC1 = 5V, VCC2 = 3.3V
MAX6715-29 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (
TOTAL
ICC1
ICC2
SUPPLY CURRENT vs. TEMPERATURE
VCC1 = 3.3V, VCC2 = 2.5V
MAX6715-29 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (
TOTAL
ICC1
ICC2
SUPPLY CURRENT vs. TEMPERATURE
VCC1 = 2.5V, VCC2 = 1.8V
MAX6715-29 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (
TOTAL
ICC1
ICC2
SUPPLY CURRENT vs. TEMPERATURE
VCC1 = 1.8V, VCC2 = 1.2V
MAX6715-29 toc04
TEMPERATURE (°C)
SUPPLY CURRENT (
TOTAL
ICC1
ICC2
NORMALIZED RESET/WATCHDOG
TIMEOUT PERIOD vs. TEMPERATURE
MAX6715-29 toc05
TEMPERATURE (°C)
RESET/WATCHDOG PERIOD
10,000
MAXIMUM VCC TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6715-29 toc06
RESET THRESHOLD OVERDRIVE (mV)
MAXIMUM V
TRANSIENT DURATION (RESET OCCURS ABOVE
THIS LINE
NORMALIZED VCC RESET THRESHOLD
vs. TEMPERATURE
MAX6715-29 toc07
TEMPERATURE (°C)
RESET THRESHOLD
RESET INPUT AND POWER-FAIL INPUT
THRESHOLD vs. TEMPERATURE
MAX6715-29 toc08
TEMPERATURE (°C)
THRESHOLD (mV)-153560
VCC TO RESET DELAY
vs. TEMPERATURE
MAX6715-29 toc09
TEMPERATURE (°C)
TO RESET DELAY (
100mV OVERDRIVE
Typical Operating Characteristics(VCC1 = 5V, VCC2 = 3.3V, TA= +25°C, unless otherwise noted.)
