MAX6334UR23D3+T ,3-Pin, Ultra-Low-Voltage, Low-Power µP Reset CircuitsMAX6332/MAX6333/ 3-Pin, Ultra-Low-Voltage, Low-Power MAX6334 μP Reset Circuits
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MAX6333UR16D3+T-MAX6334UR16D2+T-MAX6334UR23D3+T
3-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits
General DescriptionThe MAX6332/MAX6333/MAX6334 microprocessor (μP)
supervisory circuits monitor the power supplies in 1.8V to 3.3V μP and digital systems. They increase circuit reliability and reduce cost by eliminating external components and adjustments.
These devices perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for a preset timeout period after VCC has risen above the reset threshold. The only difference among the three devices is their output. The MAX6333 (push/pull) and MAX6334 (open-drain) have an active-low RESET output, while the MAX6332 (push/pull) has an active-high RESET output. The MAX6332/MAX6333 are guaranteed to be in the correct state for VCC down to 0.7V. The MAX6334 is guaranteed to be in the correct state for VCC down 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 (2,500 piece minimum-order quantity); contact the factory for availability of nonstandard versions (10,000 piece minimum-order quantity). For space-critical applications, the MAX6332/MAX6333/MAX6334 come packaged in a 3-pin SOT23.
Applications●Pentium® II Computers●Computers●Controllers●Intelligent Instruments●Critical μP/μC Power Monitoring●Portable/Battery-Powered Equipment
Beneits and Features●Ultra-Low 0.7V Operating Supply Voltage●Low 3.3μA Supply Current●Precision Monitoring of 1.8V and 2.5V Power- Supply Voltages●Reset Thresholds Available from 1.6V to 2.5V, in Approximately 100mV Increments●Fully Specified Over Temperature●Three Power-On Reset Pulse Widths Available (1ms min, 20ms min, 100ms min)●Low Cost●Three Available Output Structures: Push/Pull
RESET, Push/Pull RESET, Open-Drain RESET●Guaranteed RESET/RESET Valid to VCC = 0.7V (MAX6332/MAX6333)●Power-Supply Transient Immunity●No External Components●3-Pin SOT23 Package●Pin-Compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328
Selector Guide (Standard Versions*) appears at end of data sheet.Pentium is a registered trademark of Intel Corp.
MAX6332
MAX6333VCC
VCC
RESETRESET
INPUT
GND
VCC
GND
(RESET)
( ) ARE FOR MAX6332
Typical Operating Circuit
MAX6332/MAX6333/
MAX6334
3-Pin, Ultra-Low-Voltage, Low-Power μP Reset Circuits
Terminal Voltage (with respect to GND)
VCC ......................................................................-0.3V to +6V Push/Pull RESET, RESET ....................-0.3V to (VCC + 0.3V) Open-Drain RESET .............................................-0.3V to +6VInput Current (VCC) ............................................................20mAOutput Current (RESET, RESET) ......................................20mAContinuous Power Dissipation (TA = +70°C) SOT23-3 (derate 4mW/°C above +70°C) ....................320mW
Operating Temperature Range .........................-40°C to +125°CStorage Temperature Range ............................-65°C to +160°CLead Temperature (soldering, 10s) .................................+300°CSoldering Temperature (reflow) Lead(Pb)-free packages ..............................................+260°C Packages containing lead (Pb) ....................................+240°C
(VCC = full range, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C and VCC = 3V, reset not asserted.)
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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply Voltage RangeVCC
TA = 0°C to +85°C
MAX6332/MAX63330.75.5
MAX63341.05.5
TA = -40°C to +85°C
MAX6332/MAX63330.785.5
MAX63341.25.5
TA = 0°C to +125°CMAX6332/MAX6333
MAX63341.25.5
Supply CurrentICCNo load
VCC = 1.8V3.06.0
VCC = 2.5V3.37.0
Reset ThresholdVTHMAX633_UR__D_-T, Table 1
TA = +25°CVTH
- 1.8%VTHVTH + 1.8%
TA = -40°C to +125°CVTH
- 3%VTHVTH + 3%
VCC Falling Reset DelayVCC falling at 10V/ms24µs
Reset Active Timeout PeriodtRP
MAX633_UR__D1-T11.52MAX633_UR__D2-T203040
MAX633_UR__D3-T100150200
RESET Output Low Voltage (MAX6333/MAX6334)VOLReset asserted
ISINK = 50µA, VCC ≥ 1.0V0.4ISINK = 500µA, VCC ≥ 1.8V0.3
RESET Output High Voltage (MAX6333)VOHReset not asserted
ISOURCE = 200µA, VCC ≥ 1.8V0.8 x VCCISOURCE = 500µA, VCC ≥ 2.7V0.8 x VCC
RESET Output Voltage (MAX6332)
VOHReset asserted
ISOURCE = 1µA, VCC ≥ 1.0V0.8 x VCCISOURCE = 200µA, VCC ≥ 1.8V0.8 x VCC
VOLReset not asserted
ISINK = 500µA, VCC ≥ 1.8V0.3
ISINK = 1.2mA, VCC ≥ 2.7V0.3
RESET Output Leakage
MAX6332/MAX6333/
MAX6334
3-Pin, Ultra-Low-Voltage, Low-Power μP Reset Circuits
(Reset not asserted, TA = +25°C, unless otherwise noted.)
Typical Operating CharacteristicsSUPPLY CURRENT vs. TEMPERATURE
MAX6332/33/34 toc01
TEMPERATURE (°C)
ICC
(µA)
RESET NOT ASSERTED
VCC = 1.8V
VCC = 2.5V
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
MAX6332/33/34 toc04
RESET COMPARATOR OVERDRIVE (mV)
MAXIMUM TRANSIENT DURATION (µs)
RESET OCCURS
RESET DOES
NOT OCCUR
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX6332/33/34 toc02
TEMPERATURE (°C)
NORMALIZED RESET TIMEOUT PERIOD
VTH = 2.2V
OUTPUT VOLTAGE HIGH
vs. SUPPLY VOLTAGE
MAX6332/33/34 toc05
VCC (V)
OUTPUT VOLTAGE HIGH (V
- V
) (mV)
VTH = 2.2V
ISOURCE = 100µA
RESET ASSERTED
TA = -40°C
TA = +85°C
TA = +25°C
OUTPUT VOLTAGE LOW
vs. SUPPLY VOLTAGE
MAX6332/33/34 toc06
VCC (V)
OUTPUT VOLTAGE LOW (mV)
VTH = 2.5V
ISINK = 500µA
RESET ASSERTED
TA = -40°C
TA = +85°C
TA = +25°C
VCC FALLING PROPAGATION DELAY
vs. TEMPERATURE
MAX6332/33/34 toc03
TEMPERATURE (°C)
VCC FALLING AT 10V/ms
VCC FALLING AT 1V/ms
PROPAGATION DELAY (µs)
MAX6332/MAX6333/
MAX6334
3-Pin, Ultra-Low-Voltage, Low-Power μP Reset Circuits
TOP VIEWVCC
RESET (RESET)
MAX6332
MAX6333
MAX6334
SOT23-3( ) ARE FOR MAX6332
GND
Pin Coniguration
Pin Description
PIN
NAMEFUNCTIONMAX6332MAX6333 MAX63341GNDGround2RESETActive-Low Reset Output. RESET remains low while VCC is below the reset threshold and for a reset timeout period (tRP) after VCC rises above the reset threshold. RESET on the MAX6334 is open-drain.—RESETActive-High Reset Output. RESET remains high while VCC is below the reset threshold and for a reset timeout period (tRP) after VCC rises above the reset threshold.3VCCSupply Voltage (0.7V to 5.5V)
MAX6332/MAX6333/
MAX6334
3-Pin, Ultra-Low-Voltage, Low-Power μP Reset Circuits
Applications Information
Interfacing to μPs with Bidirectional Reset PinsSince the RESET output on the MAX6334 is open-drain, this device interfaces easily with μPs that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the μP supervisor’s RESET output directly to the microcontroller’s (μC’s) RESET pin with a single pullup resistor allows either device to assert reset (Figure 1).
Negative-Going VCC TransientsIn 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 VCC transients (glitches). The Typical Operating
Characteristics show the Maximum Transient Duration vs. Reset Comparator Overdrive graph. The graph shows the maximum pulse width that a negative-going VCC transient 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 VCC falls 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
RESET pin can drift to indeterminate voltages. This does not present a problem in most cases, since most μPs and circuitry do not operate at VCC below 1V. For the MAX6333, where RESET must be valid down to 0, adding a pull-down resistor between RESET and GND removes stray leakage currents, holding RESET low (Figure 2a). The pull-down resistor value is not critical; 100kΩ is large enough not to load RESET and small enough to pull it low. For the MAX6332, where RESET must be valid to VCC = 0, a 100kΩ pull-up resistor between RESET and VCC will hold RESET high when VCC falls below 0.7V (Figure 2b).
Since the MAX6334 has an open-drain, active-low output, 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 recommended for applications
where the RESET pin is required to be valid down to VCC = 0.
Figure 1. Interfacing to μPs with Bidirectional Reset Pins
*Factory-trimmed reset thresholds are available in approximately
Figure 2. Ensuring Reset Valid Down to VCC = 0
Table 1. Factory-Trimmed Reset Thresholds*VCC
VCC
GND
MAX6334RESET
VCC
GND
RESET
INPUT
MOTOROLA
68HCXXVCC
GND
MAX6333RESET
100kΩ
(a)VCC
GND
MAX6332RESET
100kΩ*
(b)*ASSUMES HIGH-Z RESET INPUT TO THE µP
RESET-THRESHOLD SUFFIX
TA = +25°CTA = -40°C to +125°C BIT 4
MINTYPMAXMINMAXMAX633_UR25D_2.462.502.552.432.58
MAX633_UR24D_2.362.402.442.332.47
MAX633_UR23D_2.262.302.342.232.37
MAX633_UR22D_2.162.202.242.132.27
MAX633_UR21D_2.062.102.142.042.16
MAX633_UR20D_1.962.002.041.942.06
MAX633_UR19D_1.871.901.931.841.96
MAX633_UR18D_1.771.801.831.751.85
MAX633_UR17D_1.671.701.731.651.75
MAX633_UR16D_1.571.601.631.551.65
MAX6332/MAX6333/
MAX6334
3-Pin, Ultra-Low-Voltage, Low-Power μP Reset Circuits
*Sample stock is generally held on all standard versions.
*These devices are available in factory-set VCC reset thresholds
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 “UR” 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 standard 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 nonstandard
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.
Ordering Information
PARTTEMP RANGEPIN-PACKAGE
MAX6332UR__D_-T-40°C to +125°C3 SOT23
MAX6333UR__D_-T-40°C to +125°C3 SOT23
MAX6334UR__D_-T-40°C to +125°C3 SOT23
Selector Guide (Standard Versions*)
PARTOUTPUT STAGENOMINAL VTH (V)MINIMUM RESET TIMEOUT (ms)SOT TOP MARK
MAX6332UR23D3-TPush/Pull RESET2.30100FZDM
MAX6332UR22D3-TPush/Pull RESET2.20100FZCN
MAX6332UR20D3-TPush/Pull RESET2.00100FZDL
MAX6332UR18D3-TPush/Pull RESET1.80100FZCM
MAX6332UR16D3-TPush/Pull RESET1.60100FZCL
MAX6333UR23D3-TPush/Pull RESET2.30100FZCS
MAX6333UR22D3-TPush/Pull RESET2.20100FZCR
MAX6333UR20D3-TPush/Pull RESET2.00100FZCQ
MAX6333UR18D3-TPush/Pull RESET1.80100FZCP
MAX6333UR16D3-TPush/Pull RESET1.60100FZCO
MAX6334UR23D3-TOpen-Drain RESET2.30100FZDO
MAX6334UR22D3-TOpen-Drain RESET2.20100FZCV
MAX6334UR20D3-TOpen-Drain RESET2.00100FZDN
MAX6334UR18D3-TOpen-Drain RESET1.80100FZCU
MAX6334UR16D3-TOpen-Drain RESET1.60100FZCT
PACKAGE
TYPE
PACKAGE
CODEOUTLINE
NO.LAND PATTERN NO.3 SOT23U3+1
21-005190-0179
Package InformationFor the latest package outline information and land patterns (footprints), 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.
MAX6332/MAX6333/
MAX6334
3-Pin, Ultra-Low-Voltage, Low-Power μP Reset Circuits
