MAX6337US16D3+T ,4-Pin, Ultra Low-Voltage, Low-Power µP Reset Circuits with Manual ResetApplications Ordering InformationPentium II™ ComputersPART* TEMP. RANGE PIN-PACKAGEComputers MAX633 ..
MAX6337US16D3-T ,4-Pin, Ultra-Low-Voltage, Low-Power レP Reset Circuits with Manual ResetMAX6335/MAX6336/MAX633719-1412; Rev 0; 12/984-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits w ..
MAX6337US16D3-T ,4-Pin, Ultra-Low-Voltage, Low-Power レP Reset Circuits with Manual ResetApplicationsPentium II™ Computers Ordering InformationComputersPART* TEMP. RANGE PIN-PACKAGEControl ..
MAX6337US18D3-T ,4-Pin, Ultra-Low-Voltage, Low-Power レP Reset Circuits with Manual ResetApplicationsPentium II™ Computers Ordering InformationComputersPART* TEMP. RANGE PIN-PACKAGEControl ..
MAX6337US22D2+T ,4-Pin, Ultra Low-Voltage, Low-Power µP Reset Circuits with Manual ResetFeaturesThe MAX6335/MAX6336/MAX6337 microprocessor (µP)♦ Ultra-Low 0.7V Operating Supply Voltagesup ..
MAX6337US23D3+T ,4-Pin, Ultra Low-Voltage, Low-Power µP Reset Circuits with Manual ResetMAX6335/MAX6336/MAX633719-1412; Rev 2; 12/054-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits w ..
MB15E03 ,Single Serial Input PLL Frequency Synthesizer On-Chip 1.2 GHz Prescaler FUJITSU SEMICONDUCTORDS04-21340-2EDATA SHEETASSPSingle Serial InputPLL ..
MB15E03L ,Single Serial Input PLL Frequency Synthesizer On-Chip 1.2 GHz Prescaler FUJITSU SEMICONDUCTORDS04-21352-1EDATA SHEETASSPSingle Serial InputPLL ..
MB15E03LPV ,Single Serial Input PLL Frequency Synthesizer On-Chip 1.2 GHz Prescaler FUJITSU SEMICONDUCTORDS04-21352-1EDATA SHEETASSPSingle Serial InputPLL ..
MB15E05 , ASSP Single Serial Input PLL Frequency Synthesizer On-Chip 2.0GHz Prescaler
MB15E05 , ASSP Single Serial Input PLL Frequency Synthesizer On-Chip 2.0GHz Prescaler
MB15E05 , ASSP Single Serial Input PLL Frequency Synthesizer On-Chip 2.0GHz Prescaler
MAX6337US16D3+T-MAX6337US22D2+T-MAX6337US23D3+T
4-Pin, Ultra Low-Voltage, Low-Power µP Reset Circuits with Manual Reset
General DescriptionThe MAX6335/MAX6336/MAX6337 microprocessor (µP)
supervisory circuits monitor the power supplies in 1.8V
to 3.3V µP and digital systems. They increase circuit reli-
ability and reduce cost by eliminating external compo-
nents and adjustments. They also feature a debounced
manual-reset input.
These devices perform a single function: they assert a
reset signal whenever the VCCsupply voltage declines
below a preset threshold or whenever manual reset is
asserted. Reset remains asserted for a preset timeout
period after VCChas risen above the reset threshold or
after manual reset is deasserted. The only difference
among the three devices is their output. The MAX6336
(push/pull) and MAX6337 (open-drain) have an active-
low RESEToutput, while the MAX6335 (push/pull) has
an active-high RESET output. The MAX6335/MAX6336
are guaranteed to be in the correct state for VCCdown
to 0.7V. The MAX6337 is guaranteed to be in the cor-
rect state for VCCdown to 1.0V.
The reset comparator in these ICs is designed to ignore
fast transients on VCC. Reset thresholds are factory-
trimmable between 1.6V and 2.5V, in approximately
100mV increments. There are 15 standard versions
available (2500 piece minimum-order quantity); contact
the factory for availability of nonstandard versions
(10,000 piece minimum-order quantity). For space-criti-
cal applications, the MAX6335/MAX6336/MAX6337
come packaged in a 4-pin SOT143.
ApplicationsPentium II™ Computers
Computers
Controllers
Intelligent Instruments
Critical µP/µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
FeaturesUltra-Low 0.7V Operating Supply VoltageLow 3.3µA Supply CurrentPrecision Monitoring of 1.8V and 2.5V Power-
Supply VoltagesReset Thresholds Available from 1.6V to 2.5V,
in Approximately 100mV IncrementsDebounced Manual Reset Fully Specified over TemperatureThree Power-On Reset Pulse Widths Available
(1ms min, 20ms min, 100ms min)Low CostThree Available Output Structures: Push/Pull RESET, Push/Pull RESET, Open-Drain RESET
Guaranteed RESET/RESETValid to VCC= 0.7V
(MAX6335/MAX6336)Power-Supply Transient ImmunityNo External Components4-Pin SOT143 PackagePin Compatible with MAX811/MAX812 and
MAX6314/MAX6315
MAX6335/MAX6336/MAX6337
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset19-1412; Rev 2; 12/05
PART*
MAX6335US__D_-T
MAX6336US__D_-T
MAX6337US__D_-T-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
TEMP. RANGEPIN-PACKAGE4 SOT143
4 SOT143
4 SOT143
Ordering Information* These devices are available in factory-set VCCreset thresh-
olds from 1.6V to 2.5V, in approximately 0.1V increments.
Choose the desired reset threshold suffix from Table 1 and
insert it in the blanks following “US” in the part number.
Factory-programmed reset timeout periods are also available.
Insert the number corresponding to the desired nominal reset
timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in
the blank following “D” in the part number. There are 15 stan-
dard versions with a required order increment of 2500 pieces.
Sample stock is generally held on the standard versions only
(see Selector Guide). Contact the factory for availability of non-
standard versions (required order increment is 10,000 pieces).
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.
Typical Operating Circuit and Pin Configuration appear
at end of data sheet.
Selector Guide appears at end of data sheet.Pentium II is a trademark of Intel Corp.
MAX6335/MAX6336/MAX6337
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= full range, MR= VCCor unconnected, TA= -40°C to +125°C, unless otherwise noted. Typical values are at TA= +25°C and
VCC= 3V, reset not asserted.)
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)
VCC......................................................................-0.3V to +6V
Push/Pull RESET or RESET, MR............-0.3V to (VCC+ 0.3V)
Open-Drain RESET..............................................-0.3V to +6V
Input Current (VCC).............................................................20mA
Output Current (RESET, RESET).........................................20mA
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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply Voltage RangeVCC
TA = 0°C to +85°CMAX6335/MAX63360.75.5
TA = +25°CVTH -VTHVTH +
1.8%1.8%
TA = -40°C to +125°CVTH -VTHVTH +3%
Reset ThresholdVTHMAX633_US__D_-T,
Table 1V
VCCFalling Reset DelayVCCfalling at 10V/ms24µs
MAX633_US__D1-T11.52
MAX633_US__D2-T203040Reset Active Timeout PeriodtRP
MAX633_US__D3-T100150200
RESETOutput Low Voltage
(MAX6336/MAX6337)VOLISINK= 50µA, VCC ≥1.0V0.4Reset
assertedV
RESETOutput High Voltage
(MAX6336)VOHISOURCE= 200µA, VCC ≥1.8V0.8VCC
ISOURCE= 500µA, VCC ≥2.7V0.8VCCV
RESET Output Voltage
(MAX6335)
VOHReset
asserted
ISOURCE= 1µA, VCC ≥1.0V0.8VCC
ISOURCE= 200µA, VCC ≥1.8V0.8VCCV
VOLReset not
asserted
ISINK= 500µA, VCC ≥1.8V
ISINK= 1.2mA, VCC ≥2.7V
0.3V0.3
Reset not
asserted
0.3VCC0.7VCCMinimum Pulse Width1
VCC = 2.6V160
VCC = 2.6V0.42µs
V MRMRThresholdReset DelayGlitch Immunity2030kΩMRPull-Up Resistance
ISINK= 500µA, VCC ≥1.8V0.3
0.5VCC> VTH, RESETdeasserted µARESETOutput Leakage
Current (MAX6337)
Supply CurrentICCNo loadVCC = 1.8V3.06.0
VCC = 2.5V3.37.0µA
TA = -40°C to +125°CMAX6335/MAX63361.25.5
TA = -40°C to +85°CMAX6335/MAX63360.785.5
MAX6337
MAX6337
MAX6337
1.25.5
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual ResetSUPPLY CURRENT vs. TEMPERATURE
MAX6335/36/37 toc-1
TEMPERATURE (°C)
RESET NOT ASSERTED
VCC = 2.5V
VCC = 1.8V
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX6335/36/37-2
TEMPERATURE (°C)
NORMALIZED RESET TIMEOUT PERIOD
VTH = 2.2V
OUTPUT VOLTAGE LOW
vs. SUPPLY VOLTAGE
MAX6335/36/37 toc-3
VCC (V)
OUTPUT VOLTAGE LOW (mV)
VTH = 2.5V
ISINK = 500μA
RESET ASSERTED
TA = +25°C
TA = +85°C
TA = -40°C
OUTPUT VOLTAGE HIGH
vs. SUPPLY VOLTAGE
MAX6335/36/37 toc-4
VCC (V)
OUTPUT VOLTAGE HIGH (V
- V
) (mV)
VTH = 2.2V
ISOURCE = 100μA
RESET ASSERTED
TA = +25°C
TA = +85°C
TA = -40°C
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
MAX6335/36/37 toc-5
RESET COMPARATOR OVERDRIVE (mV)
MAXIMUM TRANSIENT DURATION (
RESET OCCURS
RESET DOES
NOT OCCUR
VCC FALLING PROPAGATION DELAY
vs. TEMPERATURE
MAX6332/33/34 toc-6
TEMPERATURE (°C)
PROPAGATION DELAY (
VCC FALLING AT 10V/ms
VCC FALLING AT 1V/ms
__________________________________________Typical Operating Characteristics(Reset not asserted, TA= +25°C, unless otherwise noted.)
MAX6335/MAX6336/MAX6337
MAX6335/MAX6336/MAX6337
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset
Pin DescriptionGNDGround1RESET
Active-Low Reset Output. RESETremains low while VCCis below the reset
threshold, or MRis asserted and for a reset timeout period (tRP) after VCC
rises above the reset threshold, or MRis deasserted. RESETon the
MAX6337 is open-drain. RESET
Active-High Reset Output. RESET remains high while VCCis below the
reset threshold, or MRis asserted and for a reset timeout period (tRP) after
VCCrises above the reset threshold, or MRis deasserted. RESET also
asserts when MRis low.
NAMEFUNCTION
MAX6335MAX6336
MAX6337
PIN
Applications Information
Manual-Reset InputsMany µP-based products require manual-reset capabil-
ity, allowing the operator, a test technician, or external
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 MRreturns
high. MRhas an internal 20kΩpull-up resistor, so it can
be left unconnected if not used. Connect a normally
open momentary switch from MRto GND to create a
manual-reset function; external debounce circuitry is
not required.
Interfacing to µPs with
Bidirectional Reset PinsSince the RESEToutput on the MAX6337 is open-drain,
this device interfaces easily with µPs that have bidirec-
tional reset pins, such as the Motorola 68HC11.
Connecting the µP supervisor’s RESEToutput directly
to the microcontroller’s (µC’s) RESETpin with a single
pull-up resistor allows either device to assert reset
(Figure 1).
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
VCCtransients (glitches). TheTypical Operating
Characteristicsshow the Maximum Transient Duration
vs. Reset Comparator Overdrive graph. The graph
shows the maximum pulse width that a negative-going
VCCtransient may typically have without issuing a reset
signal. As the amplitude of the transient increases, the
maximum allowable pulse width decreases.
Ensuring a Valid Reset Output
down to VCC = 0When VCCfalls below 1V and approaches the minimum
operating voltage of 0.7V, push/pull-structured reset
sinking (or sourcing) capabilities decrease drastically.
High-impedance CMOS-logic inputs connected to the
RESETpin can drift to indeterminate voltages. This
does not present a problem in most cases, since most
µPs and circuitry do not operate at VCCbelow 1V. For
the MAX6336, where RESETmust be valid down to 0,
adding a pull-down resistor between RESETand GND
removes stray leakage currents, holding RESETlow
VCC
VCC
GND
MAX6337
RESETMR
VCC
GND
RESET
INPUT
MOTOROLA
68HCXX
Figure 1. Interfacing to µPs with Bidirectional Reset PinsMR3
Manual-Reset Input. A logic low on MRasserts reset. Reset remains
asserted as long as MRis low, and for the reset timeout period (tRP) aftergoes high. Leave unconnected or connect to VCCif not used.VCC4Supply Voltage (0.7V to 5.5V)
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset
MAX6335/MAX6336/MAX6337VCC
GND
MAX6336
RESETMR
100k
(a)VCC
GND
MAX6335
RESET
100k*
(b)*ASSUMES HIGH-Z RESET INPUT TO THE μPFactory-trimmed reset thresholds are available in approximately
100mV increments, with a ±1.8% room-temperature variance.
= +25°CTA= -40°C to +125°C
MINTYPMAXMINMAXMAX633_US25D_2.462.502.552.432.58
MAX633_US24D_2.362.402.442.332.47
MAX633_US23D_2.262.302.342.232.37
MAX633_US22D_2.162.202.242.132.27
MAX633_US21D_2.062.102.142.042.16
MAX633_US20D_1.962.002.041.942.06
MAX633_US19D_1.871.901.931.841.96
MAX633_US18D_1.771.801.831.751.85
MAX633_US17D_1.671.701.731.651.75
MAX633_US16D_1.571.601.631.551.65
RESET
THRESHOLD
SUFFIX
Table 1. Factory-Trimmed Reset
Thresholds*Figure 2. Ensuring Reset Valid down to VCC= 0
(Figure 2a). The pull-down resistor value is not critical;
100kΩis large enough not to load RESET, and small
enough to pull it low. For the MAX6335, where RESET
must be valid to VCC= 0, a 100kΩpull-up resistor
between RESET and VCCwill hold RESET high when
VCCfalls below 0.7V (Figure 2b).
Since the MAX6337 has an open-drain, active-low out-
put, it typically uses a pull-up resistor. With this device,
RESET will most likely not maintain an active condition,
but will drift to a non-active level due to the pull-up
resistor and the reduced sinking capability of the open-
drain device. Therefore, this device is not recommend-
ed for applications where the RESETpin is required to
be valid down to VCC= 0.
MAX6335/MAX6336/MAX6337
4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset
PARTOUTPUT STAGENOMINAL VTH (V)MINIMUM RESET
TIMEOUT (ms)SOT TOP MARK
MAX6335US23D3-TPush/Pull RESET2.30100KABQ
MAX6335US22D3-TPush/Pull RESET2.20100KAAR
MAX6335US20D3-TPush/Pull RESET2.00100KABP
MAX6335US18D3-TPush/Pull RESET1.80100KAAQ
MAX6335US16D3-TPush/Pull RESET1.60100KAAP
MAX6336US23D3-TPush/Pull RESET2.30100KAAW
MAX6336US22D3-TPush/Pull RESET2.20100KAAV
MAX6336US20D3-TPush/Pull RESET2.00100KAAU
MAX6336US18D3-TPush/Pull RESET1.80100KAAT
MAX6336US16D3-TPush/Pull RESET1.60100KAAS
MAX6337US23D3-TOpen-Drain RESET2.30100KABS
MAX6337US22D3-TOpen-Drain RESET2.20100KAAZ
MAX6337US20D3-TOpen-Drain RESET2.00100KABR
MAX6337US18D3-TOpen-Drain RESET1.80100KAAY
MAX6337US16D3-TOpen-Drain RESET1.60100KAAX
Selector Guide (standard versions*)VCC(RESET)
GND
MAX6335
MAX6336
MAX6337
SOT143TOP VIEW
RESET
( ) ARE FOR MAX6335
MAX6335
MAX6336
VCC
VCC
RESETMRRESET
GND
PUSHBUTTON
SWITCH
VCC
GND
(RESET)
( ) ARE FOR MAX6335
Pin ConfigurationTypical Operating Circuit* Sample stock is generally held on all standard versions.
