MAX6315US29D4+T ,Open-Drain SOT µP Reset CircuitOpen-Drain SOT µP Reset CircuitMAX6315
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MAX6315US30D2+T ,Open-Drain SOT µP Reset CircuitOpen-Drain SOT µP Reset CircuitMAX6315
MAX6315US30D4+T ,Open-Drain SOT µP Reset CircuitApplications The first two letters in the package top mark identify the part,while the remaining tw ..
MAX6315US31D2+T ,Open-Drain SOT µP Reset CircuitGeneral Description Benefits and
MAX6315US31D3 ,Open-Drain SOT µP Reset CircuitFeaturesThe MAX6315 low-power CMOS microprocessor (µP)• Supervisory Circuit Ensures Reliable System ..
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MAX6315US26D1+T-MAX6315US26D2-MAX6315US26D2+ -MAX6315US26D2+T-MAX6315US26D3-MAX6315US26D3+-MAX6315US26D3+T-MAX6315US26D4-MAX6315US26D4+T-MAX6315US29D1+-MAX6315US29D1+T-MAX6315US29D3+T-MAX6315US29D4+T-MAX6315US30D1+T-MAX6315US30D2+T-MAX6315US30D4+T-MAX6315US31D2+T-MAX6315US3
Open-Drain SOT µP Reset Circuit
MAX6315Open-Drain SOT µP Reset Circuit
General DescriptionThe MAX6315 low-power CMOS microprocessor (µP)
supervisory circuit is designed to monitor power sup-
plies in µP and digital systems. It provides excellent cir-
cuit reliability and low cost by eliminating external
components and adjustments. The MAX6315 also pro-
vides a debounced manual reset input.
This device performs a single function: it asserts a reset
signal whenever the VCCsupply voltage falls below a
preset threshold or whenever manual reset is asserted.
Reset remains asserted for an internally programmed
interval (reset timeout period) after VCC has risen above
the reset threshold or manual reset is deasserted. The
MAX6315’s open-drain RESEToutput can be pulled up
to a voltage higher than VCC.
The MAX6315 comes with factory-trimmed reset thresh-
old voltages in 100mV increments from 2.5V to 5V.
Preset timeout periods of 1ms, 20ms, 140ms, and
1120ms (min) are also available. The device comes in a
SOT143 package.
For microcontrollers (µCs) and µPs with bidirectional
reset pins, see the MAX6314 data sheet.
ApplicationsComputers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Benefits and FeaturesSupervisory Circuit Ensures Reliable System
Operation with Minimal Power ConsumptionPrecision, Factory-Set VCCReset Thresholds:
100mV Increments from 2.5V to 5VFour Reset Timeout Periods Available:
1ms, 20ms, 140ms, or 1120ms (min)Immune to Short VCCTransientsOpen-Drain RESETOutput Can Exceed VCCGuaranteed Over Temperature5µA Supply Current
Pin Compatible with MAX811
Saves Space4-Pin SOT143 Package
VCCRESET
GND
MAX6315
SOT143TOP VIEW
Pin ConfigurationMAX6315
VCC
VCC
GND
RESET
RESET
LASER-
TRIMMED
RESISTORS
RESET
CIRCUITRY
Typical Operating Circuit
Ordering Information continued at end of data sheet.
PART†
NOMINAL
VTH(V)
MIN tRP
(ms)
TOP
MARK††
MAX6315US50D1-T5.001FX_ _
Ordering Information†The MAX6315 is available in a SOT143 package, -40°C to
+125°C temperature range.
††The first two letters in the package top mark identify the part,
while the remaining two letters are the lot tracking code.Devices are available in both leaded and lead-free packaging.
Specify lead(Pb)-free by replacing “-T” with “+T” when ordering.
Note:All devices available in tape-and-reel only. Contact
factory for availability.
MAX6315Open-Drain SOT µP Reset Circuit
Absolute Maximum Ratings
Electrical Characteristics(VCC= +2.5V to +5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C.)
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.
Note 1:The MAX6315 monitors VCCthrough an internal factory-trimmed voltage-divider that programs the nominal reset threshold.
Factory-trimmed reset thresholds are available in 100mV increments from 2.5V to 5V (see the Ordering Information).
VCC........................................................................-0.3V to +6.0V
RESET....................................................................-0.3V to +6.0V
All Other Pins..............................................-0.3V to (VCC+ 0.3V)
Input Current (VCC).............................................................20mA
Output Current (RESET)......................................................20mA
Rate of Rise (VCC)...........................................................100V/µs
Continuous Power Dissipation (TA= +70°C)
SOT143 (derate 4mW/°C above +70°C)........................320mW
Operating Temperature Range.........................-40°C to +125°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°C
MAX6315US_ _D2-T (-40°C to +85°C)
MAX6315US_ _D1-T (-40°C to +125°C)
MAX6315US_ _D2-T (-40°C to +125°C)= +25°C
VCC> 1.2V, ISINK= 0.5mA
VCC= 3.6V, no load (-40°C to +85°C)
VCC= 5.5V, no load (-40°C to +85°C)= -40°C to +85°C
VTH- 2.5%VTH+ 2.5%482840
VCC> VTH, RESETdeasserted
VTH> 4.0V
VCC= falling at 1mV/µs
MAX6315US_ _D1-T (-40°C to +85°C)
VCC> 4.25V, ISINK= 3.2mA
CONDITIONSVCC> 2.5V, ISINK= 1.2mA
VCC> 1.0V, ISINK= 80µA
0.3 x VCC
0.7 x VCC
0.3= -40°C to +125°C
MAX6315US_ _D4-T (-40°C to +85°C)
MAX6315US_ _D3-T (-40°C to +125°C)
VCC= 3.6V, no load (-40°C to +125°C)
VTH- 3.5%VTH+ 3.5%
MAX6315US_ _D4-T (-40°C to +125°C)8962688
MAX6315US_ _D3-T (-40°C to +85°C)1402002801RESETOutput Leakage Current
VOLRESETOutput Voltage3263100MRPullup Resistance
VTH- 1.8%VTHVTH+ 1.8%
VTHReset Threshold (Note 1)
ICC1.05.5VCCOperating Voltage Range
VCCSupply Current500MRto Reset Delay100MRGlitch Rejection1MRMinimum Input Pulse
0.8VILInput Threshold
ppm/°C60ΔVTH/°CReset Threshold Tempco35VCCto Reset Delay1.42
tRPReset Timeout Period
UNITSMINTYPMAXSYMBOLPARAMETERVIL
VIH
VIH
VCC= 5.5V, no load (-40°C to +125°C)= -40°C to +85°C
VTH< 4.0V
MANUAL RESET INPUT
MAX6315-01
TEMPERATURE (°C)
SUPPLY CURRENT (
VCC = 5V
VCC = 3V
VCC = 1V
SUPPLY CURRENT vs. TEMPERATURE135
SUPPLY CURRENT
vs. SUPPLY VOLTAGEMAX6315-02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
TA = -40°C
TA = +25°C
TA = +85°C
POWER-DOWN RESET DELAY
vs. TEMPERATURE
MAX6315-03
TEMPERATURE (°C)
POWER-DOWN RESET DELAY (
VCC FALLING AT 1mV/µs
VTH = 4.63V
VTH = 3.00V
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE (VCC RISING)
1.03MAX6315-04
TEMPERATURE (°C)
NORMALIZED RESET TIMEOUT PERIOD
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE (VCC FALLING)
MAX6315-05
TEMPERATURE (°C)
NORMALIZED RESET THRESHOLD
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
MAX6315-06
RESET COMP. OVERDRIVE, VTH - VCC (mV)
MAXIMUM TRANSIENT DURATION (
TA = +25°C
RESET OCCURS
ABOVE CURVE
VTH = 4.63V
VT = 3.00V
MAX6315Open-Drain SOT µP Reset Circuit
Pin Description
NAMEFUNCTIONGNDGroundRESETActive-Low Open-Drain Output. Connect to an external pullup resistor. Can be pulled up to a voltage
higher than VCC, but less than 6V.
PINMRManual Reset Input. A logic-low on MRasserts reset. Reset remains asserted as long as MRis low, and
for the reset timeout period (tRP) after the reset conditions are terminated. Connect to VCCif not used.VCCSupply Voltage and Reset Threshold Monitor Input
Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
MAX6315Open-Drain SOT µP Reset Circuit
Detailed Description
Reset OutputA microprocessor’s (µP’s) reset input starts the µP in a
known state. The MAX6315 asserts reset to prevent
code-execution errors during power-up, power-
down, or brownout conditions. RESETis guaranteed to
be a logic-low for VCC> 1V (see the Electrical
Characteristics table). Once VCCexceeds the reset
threshold, the internal timer keeps RESETasserted for
the reset timeout period (tRP); after this interval RESET
goes high. If a brownout condition occurs (monitored
voltage dips below its programmed reset threshold),
RESETgoes low. Any time VCCdips below the reset
threshold, the internal timer resets to zero and RESET
goes low. The internal timer starts when VCCreturns
above the reset threshold, and RESETremains low for
the reset timeout period.
The MAX6315’s RESEToutput structure is a simple
open-drain n-channel MOSFET switch. Connect a pull-
up resistor to any supply in the 0V to +6V range. Select
a resistor value large enough to register a logic low
when RESETis asserted (see the Electrical
Characteristics table), and small enough to register a
logic high while supplying all input current and leakage
paths connected to the RESETline. A 10kΩpullup is
sufficient in most applications.
Often, the pullup connected to the MAX6315’s RESET
output will connect to the supply voltage monitored at
the IC’s VCCpin. However, some systems may use the
open-drain output to level-shift from the monitored
supply to reset circuitry powered by some other supply
(Figure 1). This is one useful feature of an open-drain
output. Keep in mind that as the MAX6315’s VCC
decreases below 1V, so does the IC’s ability to sink
current at RESET. Finally, with any pullup, RESETwill
be pulled high as VCCdecays toward 0V. The voltage
where this occurs depends on the pullup resistor value
and the voltage to which it connects (see the Electrical
Characteristics table).
Manual-Reset InputMany µP-based products require manual-reset capa-
bility, allowing the operator, a test technician, or exter-
nal logic circuitry to initiate a reset. A logic low on MR
asserts reset. Reset remains asserted while MRis low,
and for the reset active timeout period after MR
returns high. has an internal 63kΩpullup resistor, so it can be
left open if not used. Connect a normally open momen-
tary 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
from MRto ground provides additional noise immunity.
Applications Information
Negative-Going VCCTransientsIn addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, these devices
are relatively immune to short-duration negative-going
transients (glitches). The Typical Operating Character-
isticsshow the Maximum Transient Duration vs. Reset
Comparator Overdrive, for which reset pulses are not
generated. The graph was produced using negative-
going pulses, starting at VRSTmax and ending below
the programmed reset threshold by the magnitude indi-
cated (reset threshold overdrive). The graph shows the
maximum pulse width that a negative-going VCCtran-
sient may typically have without causing a reset pulse
to be issued. As the transient amplitude increases (i.e.,
goes farther below the reset threshold), the maximum
allowable pulse width decreases. A 0.1µF bypass
capacitor mounted close to VCCprovides additional
transient immunity.
Figure 1. MAX6315 Open-Drain RESETOutput Allows Use
with Multiple Supplies
MAX6315
VCC
GND
RESETMR
5V SYSTEM
+5.0V+3.3V
10kΩ
MAX6315Open-Drain SOT µP Reset Circuit
Ordering Information (continued)
PART†
NOMINAL
VTH(V)
MIN tRP
(ms)
TOP
MARK††
MAX6315US45D1-T4.501GC_ _
MAX6315US44D1-T†††4.391GD_ _
MAX6315US43D1-T4.301GE_ _
MAX6315US42D1-T4.201GF_ _
MAX6315US41D1-T4.101GG_ _
MAX6315US40D1-T4.001GH_ _
MAX6315US39D1-T3.901GI_ _
MAX6315US38D1-T3.801GJ_ _
MAX6315US37D1-T3.701GK_ _
MAX6315US36D1-T3.601GL_ _
MAX6315US35D1-T3.501GM_ _
MAX6315US34D1-T3.401GN_ _
MAX6315US33D1-T3.301GO_ _
MAX6315US32D1-T3.201GP_ _
MAX6315US31D1-T3.081GQ_ _
MAX6315US30D1-T3.001GR_ _
MAX6315US29D1-T2.931GS_ _
PART†
MAX6315US37D2-T3.7020HK_ _
MAX6315US36D2-T3.60
NOMINAL
VTH(V)
MIN tRP
(ms)HL_ _
TOP
MARK††
MAX6315US50D2-T5.0020GX_ _
MAX6315US49D2-T4.9020GY_ _
MAX6315US48D2-T4.8020GZ_ _
MAX6315US47D2-T4.7020HA_ _
MAX6315US46D2-T4.6320HB_ _
MAX6315US45D2-T4.5020HC_ _
MAX6315US44D2-T†††4.3920HD_ _
MAX6315US43D2-T4.3020HE_ _
MAX6315US42D2-T4.2020HF_ _
MAX6315US41D2-T4.1020HG_ _
MAX6315US40D2-T4.0020HH_ _
MAX6315US39D2-T3.9020HI_ _
MAX6315US38D2-T3.8020HJ_ _
MAX6315US34D2-T3.4020HN_ _
MAX6315US33D2-T3.3020HO_ _
MAX6315US35D2-T3.5020HM_ _
MAX6315US47D1-T4.701GA_ _
MAX6315US48D1-T4.801FZ_ _
MAX6315US46D1-T4.631GB_ _
MAX6315US49D1-T4.901FY_ _
MAX6315US26D1-T†††2.631GV_ _
MAX6315US27D1-T2.701GU_ _
MAX6315US28D1-T2.801GT_ _
MAX6315US25D1-T2.501GW_ _
MAX6315US29D2-T2.9320HS_ _
MAX6315US28D2-T2.8020HT_ _
MAX6315US26D2-T†††2.6320HV_ _
MAX6315US25D2-T2.5020HW_ _
MAX6315US27D2-T2.7020HU_ _
MAX6315US32D2-T4.2020HP_ _
MAX6315US31D2-T3.0820HQ_ _
MAX6315US30D2-T3.0020HR_ _
†The MAX6315 is available in a SOT143 package, -40°C to +125°C temperature range.
††The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code.
†††Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.
Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.
Devices are available in both leaded and lead(Pb)-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering.
Note:All devices available in tape-and-reel only. Contact factory for availability.
MAX6315Open-Drain SOT µP Reset Circuit
Ordering Information (continued)
PART†
NOMINAL
VTH(V)
MIN tRP
(ms)
TOP
MARK††
MAX6315US50D3-T5.00140HX_ _
MAX6315US49D3-T4.90140HY_ _
MAX6315US48D3-T4.80140HZ_ _
MAX6315US47D3-T4.70140IA_ _
MAX6315US46D3-T†††4.63140IB_ _
MAX6315US45D3-T4.50140IC_ _
MAX6315US44D3-T†††4.39140ID_ _
MAX6315US43D3-T4.30140IE_ _
MAX6315US42D3-T4.20140IF_ _
MAX6315US41D3-T4.10140IG_ _
MAX6315US40D3-T4.00140IH_ _
MAX6315US39D3-T3.90140II_ _
MAX6315US38D3-T3.80140IJ_ _
MAX6315US37D3-T3.70140IK_ _
MAX6315US36D3-T3.60140IL_ _
MAX6315US35D3-T3.50140IM_ _
MAX6315US34D3-T3.40140IN_ _
MAX6315US33D3-T3.30140IO_ _
MAX6315US32D3-T3.20140IP_ _
MAX6315US31D3-T†††3.08140IQ_ _
MAX6315US30D3-T3.00140IR_ _
MAX6315US29D3-T†††2.93140IS_ _
JW_ _11202.50MAX6315US25D4-T
JV_ _11202.63
MAX6315US26D4-T†††JU_ _11202.70MAX6315US27D4-T
JT_ _11202.80MAX6315US28D4-T
JS_ _11202.93MAX6315US29D4-T
JR_ _11203.00MAX6315US30D4-T
JQ_ _11203.08MAX6315US31D4-T
JP_ _11203.20MAX6315US32D4-T
JO_ _11203.30MAX6315US33D4-T
JN_ _11203.40MAX6315US34D4-T
JM_ _11203.50MAX6315US35D4-T
JL_ _11203.60MAX6315US36D4-T
JK_ _11203.70MAX6315US37D4-T
JJ_ _11203.80MAX6315US38D4-T
JI_ _11203.90MAX6315US39D4-T
JH_ _11204.00MAX6315US40D4-T
JG_ _11204.10MAX6315US41D4-T
JF_ _11204.20MAX6315US42D4-T
JE_ _11204.30MAX6315US43D4-T
JD_ _11204.39
MAX6315US44D4-T†††JC_ _11204.50MAX6315US45D4-T
JB_ _11204.63MAX6315US46D4-T
TOP
MARK††
MIN tRP
(ms)
NOMINAL
VTH(V)PART†
†The MAX6315 is available in a SOT143 package, -40°C to +125°C temperature range.
††The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code.
†††Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.
Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.
Devices are available in both leaded and lead(Pb)-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering.
Note:All devices available in tape-and-reel only. Contact factory for availability.
JA_ _11204.70MAX6315US47D4-T
IX_ _
IY_ _
IZ_ _1120
4.80MAX6315US48D4-T
MAX6315US49D4-T
MAX6315US50D4-T
MAX6315US28D3-T2.80140IT_ _
MAX6315US27D3-T2.70140IU_ _
MAX6315US26D3-T†††2.63140IV_ _
MAX6315US25D3-T2.50140IW_ _
Chip InformationTRANSISTOR COUNT: 519
Package InformationFor the latest package outline information and land patterns (foot-
prints), go to www.maximintegrated.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but the
drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODEOUTLINE NO.LAND
PATTERN NO.4 SOT35U4+1
21-005290-0183
