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MAX6305UK00D2-MAX6305UK00D3-MAX6305UK00D3+T-MAX6308UK00D3-MAX6309UK29D3+T
5-Pin, Multiple-Input, Programmable Reset ICs
General DescriptionThe MAX6305–MAX6313 CMOS microprocessor (µP)
supervisory circuits are designed to monitor more than
one power supply. Ideal for monitoring both 5V and
3.3V in personal computer systems, these devices
assert a system reset if any of the monitored supplies
falls outside the programmed threshold. Low supply
current (15µA) and a small package suit them for
portable applications. The MAX6305–MAX6313 are
specifically designed to ignore fast transients on
any monitored supply.
These devices are available in a SOT23-5 package,
have factory-programmed reset thresholds from 2.5V to
5.0V (in 100mV increments), and feature four power-on
reset timeout periods. Ten standard versions are avail-
able. Contact the factory for availability of non standard
versions.
ApplicationsPortable Computers
Computers
Controllers
Intelligent Instruments
Portable/Battery-Powered Equipment
Multivoltage Systems: 3V/5V, 5V/12V, 5V/24V
Embedded Control Systems
FeaturesSmall 5-Pin SOT23 PackagePrecision Factory-Set VCCReset Thresholds;
Available in 0.1V Increments from 2.5V to 5VImmune to Short VCCTransientsGuaranteed RESETValid to VCC= 1VGuaranteed Over Temperature8µA Supply CurrentFactory-Set Reset Timeout Delay from
1ms (min) to 1120ms (min)No External ComponentsManual Reset InputUnder/Overvoltage Supply Monitoring
MAX6305–MAX6313
5-Pin, Multiple-Input,
Programmable Reset ICs19-1145; Rev 6; 7/12
Ordering InformationThe MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/
MAX6313 are available with factory-set VCCreset thresholds from
2.5V to 5V, in 0.1V increments. Insert the desired nominal reset
threshold (from Table 1) into the blanks following the letters UK.
All parts also offer factory-programmed reset timeout periods.
Insert the number corresponding to the desired nominal timeout
period index following the “D” in the part number (D1 = 1ms min,
D2 = 20ms min, D3 = 140ms min, and D4 = 1120ms min). There
are 10 standard versions with a required order increment of 2,500
pieces. Sample stock is generally held on the standard versions
only (see Standard Versions table). Required order increment is
10,000 pieces for non-standard versions. Contact factory for
availability of non-standard versions. All devices available in tape-
and-reel only.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
Ordering Information continued at end of data sheet.
Standard Versions Table appears at end of data sheet.
_______________________________________________________________Selector Table
PART
OPEN-DRAIN
RESET
OUTPUT
PUSH/PULL
RESET
OUTPUT
PUSH/PULL
RESET
OUTPUT
FACTORY-
SET RESET
THRESHOLD
ON VCC
ADDITIONAL
UNDERVOLTAGE
RESET INPUTS
NEGATIVE/
OVERVOLTAGE
RESET INPUTMAX6305✔———2—
MAX6306✔——✔1—
MAX6307✔——✔1✔
MAX6308—✔——2—
MAX6309—✔—✔1—
MAX6310—✔—✔1✔
MAX6311——✔—2—
MAX6312——✔✔1—
MANUAL-
RESET
INPUT
PART†TEMP RANGEPIN -
PA C K A G E
MAX6305UK00D_-T-0°C to +70°C5 SOT23
MAX6305EUK00D_-T-40°C to +85°C5 SOT23
MAX6305–MAX6313
5-Pin, Multiple-Input,
Programmable Reset ICs
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICSVCC= +2.5V to +5.5V for the MAX6305/MAX6308/MAX6311, VCC = (VTH+ 2.5%) to +5.5V for the MAX6306/MAX6307/MAX6309/
MAX6310/MAX6312/MAX6313; 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.
VCC...........................................................................-0.3V to +6V
All Other Pins..............................................-0.3V to (VCC+ 0.3V)
Input/Output Current, All Pins.............................................20mA
Rate of Rise, VCC............................................................100V/µs
Continuous Power Dissipation (TA= +70°C)
SOT23 (derate 7.1mW/°C above +70°C)....................571mW
Operating Temperature Range
MAX63_ _UK _ _D_-T.........................................0°C to +70°C
MAX63_ _EUK _ _D_-T...................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
Soldering Temperature (reflow)
Lead (Pb) - free packages............................................+260°C
Packages containing lead (Pb).....................................+240°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSVCC RangeTA = -40°C to +85°C (Note 2)1.05.5V
Supply CurrentICCVCC = 5.5V816µA
TA = +25°CVTH -
1.5%VTHVTH +
1.5%MAX6306/MAX6307/
MAX6309/MAX6310/
MAX6312/MAX6313TA = 0°C to +70°CVTH -
2.5%VTHVTH +
2.5%Reset Threshold
(Note 3)VTH
MAX6306E/MAX6307/
MAX6309E/MAX6310E/
MAX6312E/MAX6313E
TA = -40°C to +85°CVTH -
2.5%VTHVTH +
2.5%
Reset ThresholdVTH/°C40ppm/°C
Reset ThresholdVTH HYST2 x VTHmV1.01.42.0202840140200280Reset Timeout PeriodtRP112015702240
VCC > 4.25V, ISINK = 3.2mA0.4
VCC > 2.5V, ISINK = 1.2mA0.3
VCC > 1.2V, ISINK = 500µA0.3VOLMAX6305–MAX6310
VCC > 1.0V, ISINK = 50µA0.3
VCC > 4.25V,
ISOURCE = 800µAVCC - 1.5
RESET Output Voltage
VOHMAX6308/MAX6309/
MAX6310VCC > 2.5V,
ISOURCE = 500µA0.8 x VCC
VCC > 4.25V, ISINK = 3.2mA0.4VOLVCC > 2.5V, ISINK = 1.2mA0.3
VCC > 1.8V,
ISOURCE = 150µA0.8 x VCCRESET Output Voltage
VOH
MAX6311/MAX6312/
MAX6313
VCC > 1.0V,
MAX6305–MAX6313
5-Pin, Multiple-Input,
Programmable Reset ICs
ELECTRICAL CHARACTERISTICS (continued)VCC= +2.5V to +5.5V for the MAX6305/MAX6308/MAX6311, VCC = (VTH+ 2.5%) to +5.5V for the MAX6306/MAX6307/MAX6309/
MAX6310/MAX6312/MAX6313; TA = -40°C to +85°C; unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Note 1:Overtemperature limits are guaranteed by design, not production tested.
Note 2: The MAX6305/MAX6308/MAX6311 switch from undervoltage reset to normal operation between 1.5V < VCC< 2.5V.
Note 3: The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 monitor VCCthrough an internal factory-trimmed voltage
divider, which programs the nominal reset threshold. Factory-trimmed reset thresholds are available in approximately
100mV increments from 2.5V to 5V (Table 1).
Note 4:Guaranteed by design.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
MANUAL-RESET INPUT (MAX6306/MAX6309/MAX6312)VIL0.8
VIHVTH > 4.0V2.4
VIL0.3 x VCCMR Input
VIHVTH < 4.0V0.7 x VCC
TA = 0°C to +70°C1MR Minimum Input
Pulse WidthTA = -40°C to +85°C1.5µs
MR Glitch Rejection0.1µs
MR to Reset Delay500nsV
MR Pullup Resistance3263.5100kΩ
ADJUSTABLE RESET COMPARATOR INPUTSTA = +25°C1.211.231.25
MAX6305–MAX6313, TA = 0°C to +70°C1.201.26RST IN_/OVRST_IN
Input ThresholdVRSTH
MAX6305E–MAX6313E, TA = -40°C to +85°C1.201.26
RST IN_/OVRST_IN
Input CurrentIRST IN_0V < VRST IN < VCC - 0.3V (Note 4)-25+25nA
RST IN_/OVRST_IN
Hysteresis2.5mV
MAX6305–MAX6313
5-Pin, Multiple-Input,
Programmable Reset ICs
__________________________________________Typical Operating Characteristics(VCC= +5V, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
6305 TOC01
TEMPERATURE (°C)
SUPPLY CURRENT (
VCC = 2.5V
VCC = 3.5V
VCC = 5.5V
VCC = 4.5V
VCC FALLING PROPAGATION DELAY
vs. TEMPERATURE
6305 TOC02
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
1mV
10mV
OVRST IN RISING PROPAGATION
DELAY vs. TEMPERATURE
(OVERVOLTAGE RESET INPUT)
6305 TOC03
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
1mV
10mV
RST IN_ FALLING PROPAGATION
DELAY vs. TEMPERATURE
6305 TOC04
TEMPERATURE (°C)
RST IN_ PROPAGATION DELAY (ns)
1mV
10mV4001200800
MAXIMUM TRANSIENT DURATION vs.
VCC RESET THRESHOLD OVERDRIVE6305 TOC7
TRANSIENT DURATION (
10,000
VTH = 5.0V
RESET OCCURS ABOVE LINES
VTH = 2.5V
RESET TIMEOUT
vs. TEMPERATURE
6305 TOC05
TEMPERATURE (°C)
NORMALIZED RESET TIMEOUT
RESET THRESHOLD
vs. TEMPERATURE
6305 TOC06
TEMPERATURE (°C)
NORMALIZED RESET THRESHOLD (V/V)4001200800
MAXIMUM TRANSIENT DURATION vs.
OVRST IN THRESHOLD OVERDRIVE6305 TOC8
TRANSIENT DURATION (
10,000
VTH = 5.0V
RESET OCCURS ABOVE LINES
VTH = 3.0V4001200800
MAXIMUM TRANSIENT DURATION vs.
RST IN_ THRESHOLD OVERDRIVE6305 TOC9
TRANSIENT DURATION (
10,000
VTH = 5.0V
RESET OCCURS ABOVE LINES
VTH = 3.0V
_______________Detailed DescriptionThe MAX6305–MAX6313 CMOS microprocessor (µP)
supervisory circuits are designed to monitor more than
one power supply and issue a system reset when any
monitored supply falls out of regulation. The MAX6305/
MAX6308/MAX6311 have two adjustable undervoltage
reset inputs (RST IN1 and RST IN2). The MAX6306/
MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 mon-
itor VCCthrough an internal, factory-trimmed voltage
divider. The MAX6306/MAX6309/MAX6312 have, in
addition, an adjustable undervoltage reset input and a
manual-reset input. The internal voltage divider sets the
reset threshold as specified in the device part number
(Table 1). The MAX6307/MAX6310/ MAX6313 feature an
adjustable undervoltage reset input (RST IN) and an
adjustable overvoltage reset input (OVRST IN) in addition
to the factory-trimmed reset threshold on the VCCmoni-
tor. Program the adjustable reset inputs with an external
resistor divider (see Adjustable Reset Inputs section).
Reset OutputsA µP’s reset input starts the µP in a known state. These
µP supervisory circuits assert reset to prevent code-
execution errors during power-up, power-down, or
brownout conditions.
RESET(MAX6305–MAX6310) and RESET (MAX6311/
MAX6312/MAX6313) are guaranteed to be asserted at
a valid logic level for VCC> 1V (see Electrical
Characteristics). Once all monitored voltages exceed
their programmed reset thresholds, an internal timer
keeps reset asserted for the reset timeout period (tRP);
after this interval, reset deasserts.
If a brownout condition occurs (any or all monitored volt-
ages dip outside their programmed reset threshold),
reset asserts (RESET goes high; RESETgoes low). Any
time any of the monitored voltages dip below their reset
threshold, the internal timer resets to zero and reset
asserts. The internal timer starts when all of the moni-
tored voltages return above their reset thresholds, and
reset remains asserted for a reset timeout period. The
MAX6305–MAX6313
5-Pin, Multiple-Input,
Programmable Reset ICs
______________________________________________________________Pin Description
MAX6305
MAX6308
MAX6311
NAMEFUNCTIONActive-Low, Open-Drain Reset Output for the MAX6305/MAX6306/
MAX6307. Active-Low, Push/Pull Reset Output (sources and sinks
current) for the MAX6308/MAX6309/MAX6310.1
RESETActive-High, Push/Pull Reset Output for the MAX6311/MAX6312/MAX6313GNDSystem GroundOVRST IN
Overvoltage Reset Comparator Input. Asserts reset when the monitored
voltage exceeds the programmed threshold. Set the reset threshold
with an external resistor divider. Connect to GND if unused.RST IN
Undervoltage Reset Comparator Input. Asserts reset when the
monitored voltage falls below the programmed threshold. Set the
reset threshold with an external resistor divider. Connect to VCCif
unused.
3, 4RST IN1,
RST IN2MR
Manual-Reset Input. Pull low to force a reset. RESET/RESET remains
active as long as MRis low and for the timeout period after MR
goes high. Leave unconnected or connect to VCCif unused.VCC
System Supply. The MAX6306/MAX6307/MAX6309/MAX6310/
MAX6312/MAX6313 also monitor VCCthrough an internal factory-
trimmed resistor divider to the reset comparator.
MAX6306
MAX6309
MAX6312
MAX6307
MAX6310
MAX6313
PINRESET
MAX6305–MAX6313open-drain, N-channel output. The MAX6308/MAX6309/
MAX6310 feature an active-low, complementary output
structure that both sinks and sources current, and the
MAX6311/MAX6312/MAX6313 have an active-high com-
plementary reset output.
The MAX6305/MAX6308/MAX6311 switch from under-
voltage lockout operation to normal operation between
1.5V < VCC< 2.5V. Below 1.5V, VCCundervoltage-
lockout mode asserts RESET. Above 2.5V, VCCnormal-
operation mode asserts reset if RST IN_ falls below the
RST IN_ threshold.
Manual-Reset Input
(MAX6306/MAX6309/MAX6312)Many µP-based products require manual-reset capability,
allowing an operator or external logic circuitry to initiate a
reset. A logic low on MRasserts reset. Reset remains
asserted while MRis low, and for a reset active timeout
period (tRP) after MRreturns high. This input has an inter-
nal 63.5kΩpull-up resistor, so it can be left open if it is not
used. MRcan be driven with TTL-logic levels in 5V sys-
tems, with CMOS-logic levels in 3V systems, or with open-
drain/collector output devices. Connect a normally open
momentary switch from MRto GND to create a manual-
reset function; external debounce circuitry is not required.
If MRis driven from long cables or if the device is used in
a noisy environment, connecting a 0.1µF capacitor fromto ground provides additional noise immunity.
The MRpin has internal ESD-protection circuitry that may
be forward biased under certain conditions, drawing
excessive current. For example, assume the circuitry driv-
ing MRuses a +5V supply other than VCC. If VCCdrops or
browns out lower than +4.7V, MR’s absolute maximum rat-
ing is violated (-0.3V to (VCC+ 0.3V)), and undesirable
current flows through the ESD structure from MRto VCC.
To avoid this, it is recommended that the supply for the MR
pin be the same as the supply monitored by VCC. In this
way, the voltage at MRwill not exceed VCC.
Adjustable Reset InputsThe MAX6305–MAX6313 each have one or more reset
inputs (RST IN_ /OVRST IN). These inputs are com-
pared to the internal reference voltage (Figure 1).
Connect a resistor voltage divider to RST IN_ such that
VRST IN_falls below VRSTH(1.23V) when the monitored
voltage (VIN) falls below the desired reset threshold
(VTH) (Figure 2). Calculate the desired reset voltage
with the following formula:
R1 + R2VTH= ________x VRSTHR2
5-Pin, Multiple-Input,
Programmable Reset ICsRST IN1
†††
+1.23V
+1.23V
+1.23V
+1.23V
RST IN2
RESET
GENERATOR
RESET***
OVRST IN
GND
VCC
VCC
RESET**
MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 ONLY
MAX6305–MAX6310 ONLY
MAX6311/MAX6312/MAX6313 ONLY
MAX6307/MAX6310/MAX6313 ONLY
MAX6305/MAX6308/MAX6311 ONLY
MAX6306/MAX6309/MAX6312 ONLY
MAX6305–MAX6313
***
†††
Figure 1. Functional Diagram
