MAX6467XS16D3 ,Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual ResetElectrical Characteristics(V = +1.2V to +5.5V, T = -40°C to +125°C, unless otherwise noted. Typical ..
MAX6468US26D3-T ,2.625 V, 150/300 ms, microprocessor supervisory reset circuit with edge-triggered, one-shot manual resetApplicationsis generally held on standard versions only (see StandardVersions table). Standard vers ..
MAX6468US29D3-T ,2.925 V, 150/300 ms, microprocessor supervisory reset circuit with edge-triggered, one-shot manual resetFeaturesThe MAX6467/MAX6468 microprocessor (µP) supervi- Precision Factory-Set Reset Threshold Vol ..
MAX6468XS26D1+T ,Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual ResetMAX6467/MAX6468 Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset
MAX6469UT285AD3-T ,2.85 V, 150 ms, 300 mA LDO linear regulator with internal microprocessor reset circuitApplicationsHand-Held Instruments (PDAs, Palmtops)Note: The first “_ _”are placeholders for the out ..
MAX6478BL33AD3 ,300mA LDO Linear Regulators with Internal Microprocessor Reset CircuitApplicationsHand-Held Instruments (PDAs, Palmtops)Note: The first “_ _”are placeholders for the out ..
MB2S ,Bridge RectifiersMB1S - MB8SMB1S - MB8S43
MB3120 ,Compandor ICBLOCK DIAGRAM
COMPRESSOR
EXPANDOH
INPUT
COMMON
MUTE
COMPRESSOR',
SECTION
COMPRESS ..
MB3516A ,RGB EncoderFUJITSU SEMICONDUCTORDS04-28026-2EDATA SHEETASSP Image ControlRGB EncoderMB3516An DESCRIPTIONThe ..
MB3516APF ,RGB EncoderFUJITSU SEMICONDUCTORDS04-28026-2EDATA SHEETASSP Image ControlRGB EncoderMB3516An DESCRIPTIONThe ..
MB3614 ,QUAD OPERATIONAL AMPLIFIERFUJITSU SEMICONDUCTORDS04-11107-3EDATA SHEETLINEAR ICQUAD OPERATIONAL AMPLIFIERMB3614QUAD OPERATION ..
MB3614P ,Quad operational amplifierelectrical characteristics of current industrial standard operational am-DIP-14P-M02plifier and req ..
MAX6467US26D3+T-MAX6467US44D3+T-MAX6467XS16D3-MAX6468XS26D1+T
Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset
General DescriptionThe MAX6467/MAX6468 microprocessor (µP) supervisory
circuits monitor single power-supply voltages from +1.8V
to +5.0V and assert a reset if the supply voltage drops
below its preset threshold. An edge-triggered, one-shot
manual reset function ensures that the µP enters the reset
mode for a fixed timeout period only, even in the event
of a continuously asserted manual reset. The MAX6467/
MAX6468 significantly improve system reliability compared
to traditional manual reset supervisory circuits.
A variety of factory-trimmed threshold options accommodate
different supply voltages and tolerances, eliminating
external components. The factory-set thresholds range
from +1.575V to +4.625V to monitor +5.0V, +3.3V, +3.0V,
+2.5V, and +1.8V supplies with various tolerances. Reset
timeout periods of 150ms (min) and 1200ms (min) are
available to accommodate different µP platforms.
A single, active-low RESET output asserts when VCC
drops below its threshold or if the edge-triggered MR
asserts low. RESET remains low for the reset time-
out period after VCC rises above its threshold and for
a fixed, one-shot timeout period after a manual reset
input falling edge. RESET remains valid as long as VCC
remains above +1V. Open-drain (MAX6467) and push-
pull (MAX6468) output options provide additional flexibility
in the system design.
The MAX6467/MAX6468 are offered in the space-saving
4-pin SOT143 package and the ultra-small 4-pin SC70
package and are specified over the automotive (-40°C to
+125°C) temperature range.
Applications●Cell Phones/PDAs●Embedded Control Systems●Industrial Equipment●Automotive Products●Portable/Battery-Powered Equipment●Medical Devices●DSL Modems●MP3 Players●GPS Systems●Digital Cameras
Features●Precision Factory-Set Reset Threshold Voltages for
+5.0V, +3.3V, +3.0V, +2.5V, and +1.8V Supplies●Edge-Triggered Manual Reset Input with One-Shot
Pulsed Reset Output●Two Reset Timeout Period Options (150ms or
1200ms min)●Immune to Short Voltage Transients●Low Supply Current (3µA at VCC = +1.8V)●RESET Valid to VCC = +1V●Active-Low Open-Drain and Push-Pull RESET
Output Options●-40°C to +125°C Operating Temperature Range●Small 4-Pin SC70 and SOT143 Packages●No External Components Required●Pin Compatible with MAX811, MAX6315, MAX6384,
and MAX6386
Ordering Information appears at end of data sheet.MAX6467
MAX6468
+1.0V TO +5.5V
VCC
GND
VCC
GNDRESETRESET
INPUTµP
Typical Operating Circuit
MAX6467/MAX6468Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
VCC to GND .........................................................-0.3V to +6.0V
RESET to GND
Open-Drain .......................................................-0.3V to +6.0V
Push-Pull ..............................................-0.3V to (VCC + 0.3V)
MR to GND ...............................................-0.3V to (VCC + 0.3V)
Input/Output Current (all pins) ............................................20mA
Continuous Power Dissipation (TA = +70°C)4-Pin SC70 (derate 3.1mW/°C above +70°C) .............245mW4-Pin SOT143 (derate 4mW/°C above +70vC) ...........320mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range ............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
(VCC = +1.2V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSOperating Voltage RangeVCCTA = 0°C to +125°C1.05.5V
TA = -40°C to 0°C1.25.5
Supply CurrentICC
VCC = +5.5V, no load713
VCC = +3.6V, no load611
VCC = +2.5V, no load48
VCC = +1.8V, no load37.5
VCC Reset Threshold
(See the Reset Threshold Table)VTH
TA = +25°C-1.5%VTH+1.5%TA = -40°C to +85°C-2.5%+2.5%
TA = +85°C to +125°C-3%+3%
VCC Reset DelaytRDVCC falling at 10mV/µs from VTH + 100mV
to VTH - 100mV35µs
VCC Reset Timeout PeriodtRPD3 option150225300msD7 option120018002400
MR Timeout Period tMRPD3 and D7 options150225300ms
MR Rising Debounce Period
(Note 2)tDEBD3 and D7 options150225300ms
MR Input Voltage
VILVTH < +4V0.3 x VCCVIH0.7 x VCC
VILVTH ≥ +4V0.8
VIH2.4
MR Minimum Input Pulse1µs
MR Glitch Rejection100ns
MR to RESET Delay200ns
MR Pullup ResistanceMR to VCC50015603000Ω
RESET Output High
(MAX6468 Only)VOH
VCC ≥ +2.5V, ISOURCE = 500µA, RESET
not asserted0.8 x VCCVCC ≥ +4.5V, ISOURCE = 800µA, RESET
not asserted0.8 x VCC
MAX6467/MAX6468Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Electrical CharacteristicsStresses 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.
Absolute Maximum Ratings
(VCC = +5V, MAX6468US29D3 device, TA = +25°C, unless otherwise noted.)
Note 1: Specifications over temperature are guaranteed by design. Production testing at TA = +25°C only.
Note 2: The MR input ignores falling edges that occur within the MR rising debounce period (tDEB) after MR first rises from low to
high (after a valid MR reset assertion). This prevents invalid reset assertion due to switch bounce.
(VCC = +1.2V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSRESET Output LowVOL
VCC ≥ +1V, ISINK = 80µA, RESET asserted0.3
VCC ≥ +2.5V, ISINK = 1.2mA, RESET
asserted0.3
VCC ≥ +4.5V, ISINK = 3.2mA, RESET
asserted0.3
RESET Output Leakage Current
(MAX6467 Only)ILKGRESET not asserted1µA
OUTPUT VOLTAGE LOW
vs. SINK CURRENTMAX6467 toc06
(mV)86723451
VCC = 5.0V
NORMALIZED RESET THRESHOLD
vs. TEMPERATUREMAX6467 toc05
NORMALIZED RESET THRESHOLD (V)
RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX6467 toc04
RESET TIMEOUT PERIOD (ms)
VCC TO RESET DELAY
vs. TEMPERATURE
MAX6467 toc03
TEMPERATURE (°C)
TO RESET DELAY (
VCC = VTH + 100mV TO VTH - 100mV
SUPPLY CURRENT vs. SUPPLY VOLTAGEMAX6467 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
SUPPLY CURRENT vs. TEMPERATURE
MAX6467 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (
VCC = +5.5VVCC = +3.6V
VCC = +1.8VVCC = +2.5V
MAX6467/MAX6468Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Typical Operating Characteristics
Electrical Characteristics
(VCC = +5V, MAX6468US29D3 device, TA = +25°C, unless otherwise noted.)
RESET TIMEOUT PERIODMAX6467 toc12
40ms/div
3.3V
3.3V
VCC 2V/div
RESET 2V/div
RESET PULLUP AND PULLDOWN RESPONSEMAX6467 toc11
40µs/div
1.675V
1.6V
1.475V
VCC 200mV/div
RESET 500mV/div
CRESET = 47pF, RPULLUP = 100kΩ,
VPULLUP = 1.6V
MAX6467_S16D3-T
PROPAGATION DELAY
(WITH 100mV OVERDRIVE)MAX6467 toc10
4µs/div
3.0V
2.8V
VCC 100mV/div
AC-COUPLED
RESET 1V/div
MAX6467 toc09
TEMPERATURE (°C)
MR TO RESET DELAY
vs. TEMPERATURE
TO
RESET
DELAY (ns)
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVEMAX6467 toc08
RESET THRESHOLD OVERDRIVE (mV)
MAXIMUM TRANSIENT DURATION (40302010
RESET ASSERTS
ABOVE THIS LINE
OUTPUT VOLTAGE HIGH
vs. SOURCE CURRENTMAX6467 toc07
ISOURCE (mA)
(V)645231
VCC = +5.0V
MAX6467/MAX6468Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Typical Operating Characteristics
PINNAMEFUNCTIONGNDGroundRESET
Reset Output. RESET is an active-low open-drain (MAX6467) or push-pull (MAX6468) output. RESET
asserts low when VCC drops below the selected threshold and remains low for the VCC reset timeout period
after VCC rises above the threshold. The RESET one-shot asserts low for a ixed MR reset timeout period on
the falling edge of the manual reset input. The open-drain output requires an external pullup resistorMR
Manual Reset Input. Drive MR low to initiate a reset output. MR controls an edge-triggered one-shot that
asserts RESET low for a ixed MR timeout period when MR is driven low. Internal timing circuitry ignores
switch close and open bounce to ensure proper one-shot reset timingVCC
Power-Supply Input. VCC provides power to the device and is also a monitored voltage. When VCC drops
below the selected threshold, RESET asserts low and remains low for the reset timeout period after VCC
rises above the threshold. For better noise immunity, bypass VCC to GND with a 0.1µF capacitor
VCCGND
SC70TOP VIEW
MAX6467XS
MAX6468XSRESETMR
VCCGND
SOT143MAX6467US
MAX6468US
RESETMR
MAX6467/MAX6468Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Pin Description
Pin Conigurations
Detailed Description
Reset OutputThe MAX6467 provides an active-low open-drain
RESET output. The MAX6468 provides an active-low
push-pull RESET output. RESET asserts low if VCC
drops below the selected threshold or if a falling edge
occurs on MR. RESET remains low for the VCC reset
timeout period after VCC increases above the threshold
voltage or is one-shot pulsed low for the MR timeout
period after a falling edge on MR.
Manual Reset InputMany µP-based products require manual reset capability,
allowing the operator, a test technician, or external logic
circuitry to initiate a reset. A falling edge on MR asserts
RESET low. RESET is one-shot pulsed low for the MR
timeout period after a falling edge on MR. An internal
1.5kΩ pullup resistor to VCC allows MR to be left uncon-
nected if not used. MR can be driven with TTL or CMOS-
logic levels, or with open-drain/collector outputs. Connect
a normally open momentary pushbutton switch from
MR to GND to realize a manual reset function. External
debounce circuitry is not required, as the MAX6467/
MAX6468 respond to the first falling edge on MR and
ignore subsequent falling edges within the reset timeout
period and during the MR debounce period (see Figure
1). After MR goes high for 150ms (tDEB), the manual reset
one-shot is ready to trigger a reset on the next MR falling
edge. Connect a 0.1µF capacitor from MR to GND when
using long cables to provide additional noise immunity
(Figure 2).
Figure 1. Timing Diagram
VCC
GND
GND
tRP
GND
RESET
VTH
SWITCH
BOUNCE
SWITCH
BOUNCE
SWITCH
BOUNCE
tMRPtMRPtDEB
MAX6467/MAX6468Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
