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MAX6887AETE+TMAXIMN/a4avaiHex/Quad, Power-Supply Supervisory Circuits
MAX6887FETE+N/AN/a2500avaiHex/Quad, Power-Supply Supervisory Circuits


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MAX6887AETE+T-MAX6887FETE+
Hex/Quad, Power-Supply Supervisory Circuits
General Description
The MAX6887/MAX6888 multivoltage supply supervi-
sors provide several voltage-detector inputs, one watch-
dog input, and three outputs. Each voltage-detector
input offers a factory-set undervoltage and overvoltage
threshold. Manual reset and margin disable inputs offer
additional flexibility.
The MAX6887 offers six voltage-detector inputs, while
the MAX6888 offers four inputs. Output RESETasserts
when any input voltage drops below its respective
undervoltage threshold or manual reset MRis asserted.
Output OVasserts when any input voltage exceeds its
respective overvoltage threshold. Monitor standard
supply voltages listed in the Selector Guide.
The MAX6887/MAX6888 offer a watchdog timer with an
initial and normal timeout periods of 102.4s and 1.6s,
respectively. Watchdog output WDOasserts when the
watchdog timer expires. Connect WDOto manual reset
input MRto generate resets when the watchdog timer
expires. RESET, OV, and WDOare active-low, open-
drain outputs.
The MAX6887/MAX6888 are available in a 5mm x 5mm
x 0.8mm, 16-pin thin QFN package and operate over
the extended -40°C to +85°C temperature range.
Applications

Multivoltage Systems
Telecom
Networking
Servers/Workstations/Storage Systems
Features
Hex/Quad Voltage DetectorsUndervoltage and Overvoltage Thresholds1% Threshold AccuracyMargining Disable and Manual Reset InputWatchdog TimerOpen-Drain RESET, OV, and WDOOutputs180ms (min) Reset Timeout PeriodFew External ComponentsSmall 5mm x 5mm, 16-Pin Thin QFN Packages
MAX6887/MAX6888
Hex/Quad, Power-Supply Supervisory Circuits
PARTTEMP RANGEPIN-PACKAGE
MAX6887_ETE+
-40°C to +85°C16 Thin QFN-EP*
MAX6888_ETE+
-40°C to +85°C16 Thin QFN-EP*
Ordering Information
Selector Guide

19-0291; Rev 2; 2/10
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
Note:
Insert the desired letter from the Selector Guide into the
blank to complete the part number.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
NOMINAL INPUT VOLTAGE (V)*PARTIN1IN2IN3IN4IN5IN6
TOL
(%)

MAX6887AETE5.03.32.51.8AdjAdj5
MAX6887BETE5.03.32.5AdjAdjAdj5
MAX6887CETE5.03.31.8AdjAdjAdj5
MAX6887DETE3.32.51.81.5AdjAdj5
MAX6887EETE3.32.51.8AdjAdjAdj5
MAX6887FETE3.32.51.5AdjAdjAdj5
MAX6887GETE3.32.5AdjAdjAdjAdj5
MAX6887HETE3.31.8AdjAdjAdjAdj5
MAX6887QETEAdjAdjAdjAdjAdjAdj5
NOMINAL INPUT VOLTAGE (V)*PARTIN1IN2IN3IN4IN5IN6
TOL
(%)

MAX6887IETE5.03.32.51.8AdjAdj10
MAX6887JETE5.03.32.5AdjAdjAdj10
MAX6887KETE5.03.31.8AdjAdjAdj10
MAX6887LETE3.32.51.81.5AdjAdj10
MAX6887METE3.32.51.8AdjAdjAdj10
MAX6887NETE3.32.51.5AdjAdjAdj10
MAX6887OETE3.32.5AdjAdjAdjAdj10
MAX6887PETE3.31.8AdjAdjAdjAdj10
MAX6887RETEAdjAdjAdjAdjAdjAdj10
*See thresholds options tables (Tables 1 and 2) for actual undervoltage and overvoltage thresholds.
MAX6887/MAX6888
Hex/Quad, Power-Supply Supervisory Circuits
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VIN1–VIN4or VCC= 2.7V to 5.8V, WDI = GND, MARGIN= MR= BP, TA= -40°C to +85°C, unless otherwise noted. Typical values are
at TA= +25°C.) (Notes 1, 2)
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.
(All voltages referenced to GND.)
IN1–IN6, VCC, RESET, OV, WDO.............................-0.3V to +6V
WDI, MR, MARGIN...................................................-0.3V to +6V
BP.............................................................................-0.3V to +3V
Input/Output Current (all pins)..........................................±20mA
Continuous Power Dissipation (TA= +70°C)
16-Pin 5mm x 5mm Thin QFN
(derate 20.8mW/°C above +70°C)..............................1667mW
Maximum Junction Temperature.....................................+150°C
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Operating Voltage Range
(Note 3)
Voltage on either one of IN1–IN4 or VCC to
guarantee the part is fully operational2.75.8V
Supply CurrentICCVIN1 = 5.8V, IN2–IN6 = GND, no load0.91.2mA
IN1–IN6, IN_ falling, TA = +25°C to +85°C-1+1Threshold Accuracy
(See the Selector Guide)VTHIN1–IN6, IN_ falling, TA = -40°C to +85°C-1.5+1.5% VTH
Threshold HysteresisVTH-HYST0.3% VTH
Threshold Tempco∆VTH/°C10ppm/°C
IN_ Input ImpedanceRIN
For VIN_ < highest VIN1–IN4 and
VIN_ < VCC (not ADJ), thresholds are not set
as adjustable
130200300kΩ
IN5, IN6 (MAX6887 only)IN_ Input Leakage CurrentIININ1–IN4 set as adjustable thresholds-150+150nA
Power-Up DelaytD-POVCC ≥ 2.5V2.5ms
IN_ to RESET or OV DelaytD-RIN_ falling/rising, 100mV overdrive20µs
RESET Timeout PeriodtRP180200220ms
OV Timeout PeriodtOP25µs
RESET, OV, and WDO Output
LowVOLISINK = 4mA, output asserted0.4V
RESET, OV, and WDO Output
Open-Drain Leakage CurrentILKGOutput high impedance-1+1µA
MAX6887/MAX6888
Hex/Quad, Power-Supply Supervisory Circuits
Note 1:
100% production tested at TA= +25°C and TA= +85°C. Specifications at TA= -40°C are guaranteed by design.
Note 2:
Device may be supplied from any one of IN1–IN4 or VCC.
Note 3:
The internal supply voltage, measured at VCC, equals the maximum of IN1–IN4.
Note 4:
Versions Q and R require that power be applied through VCC.
ELECTRICAL CHARACTERISTICS (continued)

(VIN1–VIN4or VCC= 2.7V to 5.8V, WDI = GND, MARGIN= MR= BP, TA= -40°C to +85°C, unless otherwise noted. Typical values are
at TA= +25°C.) (Notes 1, 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

VIL0.6MR, MARGIN, WDI Input VoltageVIH1.4V
MR Input Pulse WidthtMR1µs
MR Glitch Rejection100ns
MR to RESET or OV DelaytD-MR200ns
MR to Internal BP Pullup CurrentIMRVMR = 1.4V51015µA
MARGIN to Internal BP Pullup
CurrentIMARGINVMARGIN = 1.4V51015µA
WDI Pulldown CurrentIWDIVWDI = 0.6V51015µA
WDI Input Pulse Width50ns
tWDIInitial92.16102.4112.64Watchdog Timeout PeriodtWDNormal1.441.61.76s
Typical Operating Characteristics

(VIN1–VIN4or VCC= 5V, WDI = GND, MARGIN= MR= BP, TA= +25°C, unless otherwise noted.)
IN1–IN4 SUPPLY CURRENT
vs. IN1–IN4 SUPPLY VOLTAGE

MAX6887 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
TA = +85°C
TA = +25°C
TA = -40°C
VCC SUPPLY CURRENT
vs. VCC SUPPLY VOLTAGE

MAX6887 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
TA = +85°C
TA = +25°C
TA = -40°C
TIMEOUT PERIOD (ms)
RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX6887 toc03
TEMPERATURE (°C)3510-15-4085
PROPAGATION DELAY (
MR TO RESET OUTPUT PROPAGATION
DELAY vs. TEMPERATURE
MAX6887 toc09
TEMPERATURE (°C)3510-15-4085
MAX6887/MAX6888
Hex/Quad, Power-Supply Supervisory Circuits

PROPAGATION DELAY (
IN_ TO RESET OR OV
PROPAGATION DELAY vs. TEMPERATURE

MAX6887 toc04
TEMPERATURE (°C)3510-15-4085
100mV OVERDRIVE
TIMEOUT PERIOD (s)
WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE
MAX6887 toc05
TEMPERATURE (°C)3510-15-4085
NORMALIZED IN_ THRESHOLD
NORMALIZED IN_ THRESHOLD
vs. TEMPERATURE
MAX6887 toc06
TEMPERATURE (°C)3510-15-4085
MAXIMUM IN_ TRANSIENT
vs. IN_THRESHOLD OVERDRIVE
MAX6887 toc07
IN_ THRESHOLD OVERDRIVE (mV)
MAXIMUM TRANSIENT DURATION (
PO_ ASSERTION OCCURS
ABOVE THIS LINE
OUTPUT-VOLTAGE LOW vs. SINK CURRENT

MAX8667 toc08
SINK CURRENT (mA)
OUTPUT-VOLTAGE LOW (mV)624
Pin Description
PIN
MAX6887MAX6888NAMEFUNCTIONRESET
Open-Drain, Active-Low Reset Output. RESET asserts when any input voltage falls below its
undervoltage threshold or when MR is pulled low. RESET remains low for 200ms after all
assertion-causing conditions are cleared. An external pullup resister is required.WDO
Open-Drain, Active-Low Watchdog Timer Output. Logic output for the watchdog timer function.
WDO goes low when WDI is not strobed high-to-low or low-to-high within the watchdog timeout
period.OV
Open-Drain Active-Low Overvoltage Output. OV asserts when any input voltage exceeds its
overvoltage threshold. OV remains low for 25µs after all overvoltage conditions are cleared.
An external pullup resistor is required.
Typical Operating Characteristics (continued)

(VIN1–VIN4or VCC= 5V, WDI = GND, MARGIN= MR= BP, TA= +25°C, unless otherwise noted.)
MAX6887/MAX6888
Hex/Quad, Power-Supply Supervisory Circuits
Pin Description (continued)
PIN
MAX6887MAX6888NAMEFUNCTION
MR
Manual Reset Input. Pull MR low to assert RESET. Connect MR to WDO to generate resets
when the watchdog timer expires. Leave MR unconnected or connect to DBP if unused. MR is
internally pulled up to BP through a 10µA current source.MARGIN
Margin Input. When MARGIN is pulled low, RESET is held in its existing state independent of
subsequent changes in monitored input voltages or the watchdog timer expiration. MARGIN is
internally pulled up to BP through a 10µA current source. Leave MARGIN unconnected or
connect to BP if unused. MARGIN overrides MR if both are asserted at the same time.7WDI
Watchdog Timer Input. Logic input for the watchdog timer function. If WDI is not strobed with a
valid low-to-high or high-to-low transition within the selected watchdog timeout period, WDO
asserts. WDI is internally pulled down to GND through a 10µA current sink.8I.C.Internal Connection. Leave unconnected.VCC
Internal Power-Supply Voltage. Bypass VCC to GND with a 1µF ceramic capacitor as close to
the device as possible. VCC supplies power to the internal circuitry. VCC is internally powered
from the highest of the monitored IN1–IN4 voltages. Do not use VCC to supply power to external
circuitry. To externally supply VCC, see the Powering the MAX6887/MAX6888 section.10BP
Bypass Voltage. The internally generated voltage at BP supplies power to internal logic and
output RESET. Connect a 1µF capacitor from BP to GND as close to the device as possible. Do
not use BP to supply power to external circuitry.—IN6
Input Voltage Detector 6. IN6 monitors both undervoltage and overvoltage conditions. See the
thresholds options (Tables 1 and 2) for available thresholds. IN6 cannot power the device. For
improved noise immunity, bypass IN6 to GND with a 0.1µF capacitor installed as close to the
device as possible.—IN5
Input Voltage Detector 5. IN5 monitors both undervoltage and overvoltage conditions. See the
thresholds options (Tables 1 and 2) for available thresholds. IN5 cannot power the device. For
improved noise immunity, bypass IN5 to GND with a 0.1µF capacitor installed as close to the
device as possible.13IN4
Input Voltage Detector 4. IN4 monitors both undervoltage and overvoltage conditions. See the
thresholds options (Tables 1 and 2) for available thresholds. Power the device through IN1–IN4
or VCC (see the Powering the MAX6887/MAX6888 section). For improved noise immunity,
bypass IN4 to GND with a 0.1µF capacitor installed as close to the device as possible.14IN3
Input Voltage Detector 3. IN3 monitors both undervoltage and overvoltage conditions. See the
thresholds options (Tables 1 and 2) for available thresholds. Power the device through IN1–IN4
or VCC (see the Powering the MAX6887/MAX6888 section). For improved noise immunity,
bypass IN3 to GND with a 0.1µF capacitor installed as close to the device as possible.15IN2
Input Voltage Detector 2. IN2 monitors both undervoltage and overvoltage conditions. See the
thresholds options (Tables 1 and 2) for available thresholds. Power the device through IN1–IN4
or VCC (see the Powering the MAX6887/MAX6888 section). For improved noise immunity,
bypass IN2 to GND with a 0.1µF capacitor installed as close to the device as possible.16IN1
Input Voltage Detector 1. IN1 monitors both undervoltage and overvoltage conditions. See the
thresholds options (Tables 1 and 2) for available thresholds. Power the device through IN1–IN4
or VCC (see the Powering the MAX6887/MAX6888 section). For improved noise immunity,
bypass IN1 to GND with a 0.1µF capacitor installed as close to the device as possible.11, 12N.C.No Connection. Not internally connected.EP
MAX6887/MAX6888
Hex/Quad, Power-Supply Supervisory Circuits
Functional Diagram

LOGIC ARRA
(VIR
TUAL DIODES)
WDI
IN2 DETECTOR
IN3 DETECTOR
IN4 DETECTOR
IN5 DETECTOR
IN6 DETECTOR
IN2
IN3
IN4
IN5
(N.C.)
IN6
(N.C.)
IN1*IN_
DETECTOR
1μF
1μF
GND
( ) MAX6888 ONLY
2.55V
LDO
VCC
MARGIN
MAX6887
MAX6888
*FOR ADJUSTABLE INPUTS REFER TO THE ADJUSTABLE THRESHOLD INPUTS SECTION.
REFERENCE
RESET
WDO
OV TIMING BLOCK
RESET TIMING BLOCK
WDO TIMING BLOCK
MAX6887/MAX6888
Hex/Quad, Power-Supply Supervisory Circuits
Detailed Description

The MAX6887/MAX6888 provide several supply-detector
inputs, one watchdog input, and three outputs for power-
supply monitoring applications. The MAX6887 offers six
voltage-detector inputs, while the MAX6888 offers four.
Each voltage-detector input offers both an undervoltage
and overvoltage threshold.
The undervoltage and overvoltage thresholds are facto-
ry-set for monitoring standard supply voltages (see the
Selector Guide). Inputs in the Selector Guidethat con-
tain “Adj” allow an external voltage-divider to be con-
nected to set a user-defined threshold.
RESETgoes low when any input voltage drops below
its undervoltage threshold or when MRis brought low.
RESETstays low for 200ms after all assertion-causing
conditions have been cleared. OVgoes low when an
input voltage rises above its overvoltage threshold. OV
typically stays low for 25µs (typ) after all inputs fall
back under their overvoltage thresholds.
The MAX6887/MAX6888 offer a watchdog timer with
initial and normal timeout periods of 102.4s and 1.6s,
respectively. WDOgoes low when the watchdog timer
expires and deasserts when WDI transitions from low-
to-high or high-to-low.
Powering the MAX6887/MAX6888

The MAX6887/MAX6888 derive power from the voltage-
detector inputs IN1–IN4 or through an externally sup-
plied VCC. A virtual diode-ORing scheme selects the
positive input that supplies power to the device (see
the Functional Diagram). The highest input voltage on
IN1–IN4 supplies power to the device. One of IN1–IN4
must be at least 2.7V to ensure proper operation.
Internal hysteresis ensures that the supply input that
initially powered the device continues to power the
device when multiple input voltages are within 50mV of
each other.
VCCpowers the analog circuitry and is the bypass con-
nection for the MAX6887/MAX6888 internal supply.
Bypass VCCto GND with a 1µF ceramic capacitor
installed as close to the device as possible. The inter-
nal supply voltage, measured at VCC, equals the maxi-
mum of IN1–IN4. If VCCis externally supplied, VCC
must be at least 200mV higher than any voltage
applied to IN1–IN4 and VCCmust be brought up first.
VCCalways powers the device when all IN_ are factory
set as “Adj.” Do not use the internally generated VCCto
provide power to external circuitry.
The MAX6887/MAX6888 generate a supply voltage at
BP for the internal logic circuitry. Bypass BP to GND with
a 1µF ceramic capacitor installed as close to the device
as possible. The nominal BP output voltage is +2.55V.
Do not use BP to provide power to external circuitry.
Inputs

The MAX6887 offers six voltage-detector inputs, while
the MAX6888 offers four voltage-detector inputs. Each
voltage-detector input offers an undervoltage and over-
voltage threshold set at the factory to monitor standard
supply voltages (see the Selector Guide). The 5% and
10% tolerances are based on maximum and minimum
threshold values. Actual thresholds for the
MAX6887/MAX6888 are shown in Tables 1 and 2.
Inputs in the Selector Guidelisting “Adj” allow an exter-
nal voltage-divider to be connected to set a user-
defined threshold.
Adjustable Threshold Inputs

Inputs listed in the Selector Guidecontaining “Adj” for
inputs allow external resistor voltage-dividers to be
connected at the voltage-detector inputs. These inputs
monitor any voltage supply higher than 0.6V (see
Figure 1). Use the following equation to set a voltage-
MAX6887
MAX6888
VIN
IN_
*VREFUV
*VREFOV AND VREFUV ARE REFERENCED
TO 0.6V ACCORDING TO THE DEVICE'S TOLERANCE
*VREFOV
Figure 1. Adjusting the Monitored Threshold
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