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 ..
MAX6733UTSVD3-T ,Vcc1: 2.925 V, Vcc2: 1.575 V, active timeout period: 140 ms-280 ms, single/dual/triple-voltage mP supervisor circuit with independent watchdog outputfeatures significantly improves systemVoltages Down to +0.63V (MAX6734/MAX6735 Only)reliability and ..
MAX6734KASYD3-T ,Vcc1: 2.925 V, Vcc2: 2.188 V, active timeout period: 140 ms-280 ms, single/dual/triple-voltage mP supervisor circuit with independent watchdog outputApplicationsonly the V 1 threshold suffix after the “UT.” Insert the resetCCMultivoltage Systems ti ..
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
MAX6725AKASHD3+
Dual/Triple, Ultra-Low-Voltage, SOT23 µP Supervisory Circuits
General DescriptionThe MAX6715A–MAX6729A/MAX6797A are ultra-low- voltage microprocessor (μP) supervisory circuits designed to monitor two or three system power-supply voltages. These devices assert a system reset if any monitored supply falls below its factory-trimmed or adjustable threshold and main-tain reset for a minimum timeout period after all supplies rise above their thresholds. The integrated dual/triple superviso-ry circuits significantly improve system reliability and reduce size compared 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 the 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 cor-rect 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/output features are available (see the Selector Guide). Select reset timeout periods from 1.1ms to 1120ms (min) (see the Reset Timeout Period Suffix
Guide). The MAX6715A–MAX6729A/MAX6797A are available in small 5-, 6-, and 8-pin SOT23 packages and operate over the -40°C to +125°C temperature range.
Applications●Multivoltage Systems●Telecom/Networking Equipment●Computers/Servers●Portable/Battery- Operated Equipment●Industrial Equipment●Printers/Fax Machines●Set-Top Boxes
Features●VCC1 (Primary Supply) Reset Threshold Voltages from 1.58V to 4.63V●VCC2 (Secondary Supply) Reset Threshold Voltages from 0.79V to 3.08V●Externally 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 Period●Manual-Reset Input Option●Power-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 Options●Immune to Short VCC Transients●Low Supply Current 14μA (typ) at 3.6V●Watchdog Disable Feature●Small 5-, 6-, and 8-Pin SOT23 Packages
Ordering Information continued at end of data sheet.
Pin Configurations and Selector Guide appear at end of
data sheet.
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 MAX6716AUTLTD3-T is a dual-voltage supervisor VTH1 =
4.625V, VTH2 = 3.075V, and 210ms (typ) timeout period.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
/V denotes an automotive qualified part.
*Future product—contact factory for availability.
PARTTEMP RANGEPIN-
PACKAGE
MAX6715AUT_ _D_+T-40°C to +125°C6 SOT23
MAX6716AUT_ _D_+T-40°C to +125°C6 SOT23
MAX6717AUK_ _D_+T-40°C to +125°C5 SOT23
MAX6718AUK_ _D_+T-40°C to +125°C5 SOT23
MAX6719AUT_ _D_+T-40°C to +125°C6 SOT23
MAX6719AUT_ _D_/V+T*-40°C to +125°C6 SOT23
OUT2
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
MAX6715A-
MAX6729A/
MAX6797A
MAX6715A–MAX6729A/
MAX6797ADual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
Typical Operating Circuit
Ordering Information
Terminal Voltage (with respect to GND) VCC1, VCC2 .........................................................-0.3V to +6VOpen-Drain RST, RST1, RST2, PFO, RST ............-0.3V to +6VPush-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 +6VInput 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) .......714mWOperating Temperature Range .........................-40°C to +125°CStorage Temperature Range ............................-65°C to +150°CJunction Temperature ......................................................+150°CLead Temperature (soldering, 10s) .................................+300°C
(VCC1 = 0.8V to 5.5V, VCC2 = 0.8V to 5.5V, GND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply VoltageVCC0.85.5V
Supply Current
ICC1
VCC1 < 5.5V all I/O connections open, outputs not asserted1539
VCC1 < 3.6V all I/O connections open, outputs not asserted1028
ICC2
VCC2 < 3.6V all I/O connections open, outputs not asserted411
VCC2 < 2.75V all I/O connections open, outputs not asserted39
VCC1 Reset ThresholdVTH1
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
V (falling)1.5301.5751.620
VCC2 Reset ThresholdVTH2
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
MAX6715A–MAX6729A/
MAX6797ADual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
Absolute Maximum RatingsStresses 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
(VCC1 = 0.8V to 5.5V, VCC2 = 0.8V to 5.5V, GND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSReset Threshold TempcoΔVTH/°C20ppm/°C
Reset Threshold HysteresisVHYSTReferenced to VTH typical0.5%
VCC to Reset Output DelaytRDVCC1 = (VTH1 + 100mV) to (VTH1 - 100mV) orVCC2 = (VTH2 + 75mV) to (VTH2 - 75mV)20µs
Reset Timeout PeriodtRP1.11.652.28.813.217.6
D7 (MAX6797A only)17.526.2535
D8 (MAX6797A only)3552.5701402102802804205605608401120112016802240
ADJUSTABLE RESET COMPARATOR INPUT (MAX6719A/MAX6720A/MAX6723A–MAX6727A)RSTIN Input ThresholdVRSTIN611626.5642mV
RSTIN Input CurrentIRSTIN-100+100nA
RSTIN Hysteresis3mV
RSTIN to Reset Output DelaytRSTINDVRSTIN to (VRSTIN - 30mV)22µs
POWER-FAIL INPUT (MAX6728A/MAX6729A)PFI Input ThresholdVPFI611626.5642mV
PFI Input CurrentIPFI-100+100nA
PFI HysteresisVPFH3mV
PFI to PFO DelaytDPF(VPFI + 30mV) to (VPFI - 30mV)2µs
MANUAL-RESET INPUT (MAX6715A–MAX6722A/MAX6725A–MAX6729A)MR Input VoltageVIL0.3 x VCC1VVIH0.7 x VCC1
MR Minimum Pulse Width1µs
MR Glitch Rejection100ns
MR to Reset DelaytMR200ns
MR Pullup Resistance255080kΩ
WATCHDOG INPUT (MAX6721A–MAX6729A)Watchdog Timeout PeriodtWD
First watchdog period after reset timeout period355472s
Normal mode 1.121.682.24
WDI Pulse WidthtWDI(Note 2)50ns
WDI Input VoltageVIL0.3 x VCC1VVIH0.7 x VCC1
WDI Input CurrentIWDIVWDI = 0V or VCC1-1+1µA
MAX6715A–MAX6729A/
MAX6797ADual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
Electrical Characteristics (continued)
(VCC1 = 0.8V to 5.5V, VCC2 = 0.8V to 5.5V, GND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
Note 1: Devices tested at TA = +25°C. Overtemperature limits are guaranteed by design and not production tested.
Note 2: Parameter guaranteed by design.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
RESET/POWER-FAIL OUTPUTSRST/RST1/RST2/PFOOutput Low(Push-Pull or Open-Drain)VOL
VCC1 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
VCC1 or VCC2 ≥ 4.5V, ISINK = 3.2mA,output asserted0.4
RST/RST1/PFOOutput High(Push-Pull Only)VOH
VCC1 ≥ 1.8V, ISOURCE = 200µA, output not asserted0.8 x VCC1VCC1 ≥ 2.7V, ISOURCE = 500µA, output not asserted0.8 x VCC1
VCC1 ≥ 4.5V, ISOURCE = 800µA, output not asserted0.8 x VCC1
RST2Output High(Push-Pull Only)VOH
VCC1 ≥ 1.8V, ISOURCE = 200µA, output not asserted0.8 x VCC2VCC1 ≥ 2.7V, ISOURCE = 500µA, output not asserted0.8 x VCC2
VCC1 ≥ 4.5V, ISOURCE = 800µA, output not asserted0.8 x VCC2
RSTOutput High(Push-Pull Only)VOH
VCC1 ≥ 1.0V, ISOURCE = 1µA, reset asserted0.8 x VCC1
VCC1 ≥ 1.8V, ISOURCE = 150µA,reset asserted0.8 x VCC1
VCC1 ≥ 2.7V, ISOURCE = 500µA,reset asserted0.8 x VCC1
VCC1 ≥ 4.5V, ISOURCE = 800µA,reset asserted0.8 x VCC1
RSTOutput Low(Push-Pull or Open Drain)VOL
VCC1 or VCC2 ≥ 1.8V, ISINK = 500µA,reset not asserted0.3VCC1 or VCC2 ≥ 2.7V, ISINK = 1.2mA,reset not asserted0.3
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
MAX6715A–MAX6729A/
MAX6797ADual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
Electrical Characteristics (continued)
(VCC1 = 5V, VCC2 = 3.3V, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
(VCC1 = +3.3V, VCC2 = +2.5V)MAX6715A-29A toc02
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
TOTAL
ICC1
ICC2
SUPPLY CURRENT vs. TEMPERATURE
(VCC1 = +2.5V, VCC2 = +1.8V)
MAX6715A-29A toc03
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
TOTAL
ICC1
ICC2
SUPPLY CURRENT vs. TEMPERATURE
(VCC1 = +1.8V, VCC2 = +1.2V)
MAX6715A-29A toc04
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
TOTAL
ICC1
ICC2
NORMALIZED/RESET WATCHDOG
TIMEOUT PERIOD vs. TEMPERATURE
MAX6715A-29A toc05
TEMPERATURE (°C)
RESET/WATCHDOG TIMEOUT PERIOD
10,000
MAXIMUM VCC TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6715A-29A toc06
RESET THRESHOLD OVERDRIVE (mV)
MAXIMUM V
TRANSIENT DURATION (µs)
RESET OCCURS ABOVE
THIS LINE
NORMALIZED VCC RESET THRESHOLD
vs. TEMPERATURE
MAX6715A-29A toc07
RESET THRESHOLD
SUPPLY CURRENT vs. TEMPERATURE
(VCC1 = +5V, VCC2 = +3.3V)
MAX6715A-29A toc01
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
TOTAL
ICC1
ICC2
RESET INPUT AND POWER-FAIL INPUT
THRESHOLD vs. TEMPERATURE
MAX6715A-29A toc08
RESET THRESHOLD
VCC TO RESET DELAY
vs. TEMPERATURE
MAX6715A-29A toc09
TO RESET DELAY (µs)
75mV OVERDRIVE
MAX6715A–MAX6729A/
MAX6797ADual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
Typical Operating Characteristics
(VCC1 = 5V, VCC2 = 3.3V, TA = +25°C, unless otherwise noted.)
PIN
NAMEFUNCTIONMAX6715A/
MAX6716A
MAX6717A/
MAX6718A
MAX6719A/
MAX6720A
MAX6721A/
MAX6722A
MAX6723A/
MAX6724A
MAX6725A/
MAX6726AMAX6727A
MAX6728A/
MAX6729A/
MAX6797A111111, 41RST/
RST1
Active-Low Reset Output, Open-Drain or Push-Pull.
RST/RST1 changes from high to low when VCC1 or VCC2 drops below the selected reset thresholds, RSTIN is below threshold,
MR is pulled low, or the watchdog triggers a reset.
RST/RST1 remains low for the reset timeout period after VCC1/VCC2/RSTIN exceed the device reset thresholds, MR goes low to high, or the watchdog triggers a reset. Open-drain outputs require an external pullup resistor. Push-pull outputs are referenced to VCC1.
RSTIN INPUT TO RESET OUTPUT DELAY
vs. TEMPERATURE
MAX6715A-29A toc10
TEMPERATURE (°C)
RSTIN TO RESET DELAY (µs)
30mV OVERDRIVE
POWER-FAIL INPUT TO POWER-FAIL
OUTPUT DELAY vs. TEMPERATURE
MAX6715A-29A toc11
TEMPERATURE (°C)
POWER-FAIL DELAY (µs)
30mV OVERDRIVE
VRST
2V/div
MAX6715A-29A toc12
50ns/div
MR TO RESET OUTPUT DELAYVMR
2V/div
MAX6715A–MAX6729A/
MAX6797ADual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
Pin Description
Typical Operating Characteristics (continued)
PIN
NAMEFUNCTIONMAX6715A/
MAX6716A
MAX6717A/
MAX6718A
MAX6719A/
MAX6720A
MAX6721A/
MAX6722A
MAX6723A/
MAX6724A
MAX6725A/
MAX6726AMAX6727A
MAX6728A/
MAX6729A/
MAX6797A———————RST2
Active-Low Reset Output, Open-Drain or Push-Pull.
RST2 changes from high to low when VCC1 or VCC2 drops below the selected reset thresholds or MR is pulled low. RST2 remains low for the reset timeout period after VCC1/VCC2 exceed the device reset thresholds or MR goes low to high. Open-drain outputs require an external pullup resistor. Push-pull outputs are referenced to VCC2.2222222GNDGround333—555MR
Active-Low Manual-Reset Input. Internal 50kΩ pullup to VCC1. Pull low to force a reset. Reset remains active as long
as MR is low and for the reset timeout period after
MR goes high. Leave unconnected or connect to VCC1 if unused.4444666VCC2
Secondary Supply Voltage Input. Powers the device when it is above VCC1 and input for secondary reset threshold monitor.5666888VCC1
Primary Supply Voltage Input. Powers the device when it is above VCC2 and input for primary reset threshold monitor.
MAX6715A–MAX6729A/
MAX6797ADual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
Pin Description (continued)
PIN
NAMEFUNCTIONMAX6715A/
MAX6716A
MAX6717A/
MAX6718A
MAX6719A/
MAX6720A
MAX6721A/
MAX6722A
MAX6723A/
MAX6724A
MAX6725A/
MAX6726AMAX6727A
MAX6728A/
MAX6729A/
MAX6797A——53333WDI
Watchdog Input. If WDI remains high or low for longer than the watchdog timeout period, the internal watchdog timer runs out and the reset output asserts for the reset timeout period. The internal watchdog timer clears whenever a reset is asserted or WDI sees a rising or falling edge. The watchdog has a long startup period (35s min) after each reset event and a short watchdog timeout period (1.12s min) after the irst valid WDI transition. Leave WDI unconnected to disable the watchdog timer. The WDI unconnected-state detector uses a small 200nA current source. Therefore, do not connect WDI to anything that will source more than 50nA.—5—577—RSTIN
Undervoltage Reset Comparator Input. High-impedance input for adjustable reset monitor.
The reset output is asserted when RSTIN falls below the 0.626V internal reference voltage. Set the monitored voltage reset threshold with an external resistor-divider network. Connect RSTIN to VCC1 or VCC2 if not used.
MAX6715A–MAX6729A/
MAX6797ADual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
Pin Description (continued)
PIN
NAMEFUNCTIONMAX6715A/
MAX6716A
MAX6717A/
MAX6718A
MAX6719A/
MAX6720A
MAX6721A/
MAX6722A
MAX6723A/
MAX6724A
MAX6725A/
MAX6726AMAX6727A
MAX6728A/
MAX6729A/
MAX6797A——————7PFI
Power-Fail Voltage Monitor Input. High-impedance input for internal power-fail monitor comparator. Connect PFI to an external resistor-divider network to set the power-fail threshold voltage (0.626V typical internal reference voltage). Connect to GND, VCC1, or VCC2 if not used.——————4PFO
Active-Low Power-Fail Monitor Output, Open-Drain or Push-Pull. PFO is asserted low when PFI is less than 0.626V. PFO deasserts without a reset timeout period. Open-drain outputs require an external pullup resistor. Push-pull outputs are referenced to VCC1.————4——RST
Active-High Reset Output, Open-Drain or Push-Pull. RST changes from low to high when VCC1 or VCC2 drops below selectedreset thresholds, RSTIN is below threshold, MR is pulled low, or the watchdog triggers a reset. RST remains HIGH for the reset timeout period after VCC1/VCC2/RSTIN exceed the device reset thresholds, MR goes lowto high, or the watchdog triggers a reset. Open-drain outputs require an external pullup resistor. Push-pull outputs are referenced to VCC1.
MAX6715A–MAX6729A/
MAX6797ADual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
Pin Description (continued)
