MAX6713Z ,4-Pin SC70 Microprocessor Reset Circuits with Manual Reset InputFeaturesThe MAX6711/MAX6712/MAX6713 are microprocessor Precision Monitoring of 2.5V, 3.0V, 3.3V, a ..
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MAX6713Z
4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input
General DescriptionThe MAX6711/MAX6712/MAX6713 are microprocessor
(µP) supervisory circuits used to monitor the power
supplies in µP and digital systems. They provide excel-
lent circuit reliability and low cost by eliminating exter-
nal components and adjustments when used with
+5.0V, +3.3V, +3.0V, or +2.5V-powered circuits. They
also provide a debounced manual reset input.
These circuits assert a reset signal whenever the VCC
supply voltage declines below a preset threshold or
whenever manual reset is asserted. Reset remains
asserted for at least 140ms after VCChas risen above
the reset threshold or when manual reset is deasserted.
Reset thresholds suitable for operation with a variety of
supply voltages are available.
The MAX6713 has an open-drain output stage, while
the MAX6711/MAX6712 have push-pull outputs. The
MAX6713’s open-drain RESEToutput requires a pull-up
resistor that can be connected to a voltage higher than
VCC. The MAX6711/MAX6713 have an active-low reset
output, while the MAX6712 has an active-high reset out-
put. The reset comparator is designed to ignore fast
transients on VCC, and the outputs are guaranteed to
be in the correct logic state for VCCdown to 1V.
Low supply current makes the MAX6711/MAX6712/
MAX6713 ideal for use in portable equipment. These
devices are available in a 4-pin SC70 package.
ApplicationsComputers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
____________________________FeaturesPrecision Monitoring of 2.5V, 3.0V, 3.3V, and 5.0V
Power-Supply VoltagesFully Specified Over TemperatureAvailable in Three Output Configurations
Push-Pull RESET Output (MAX6711)
Push-Pull RESETOutput (MAX6712)
Open-Drain RESETOutput (MAX6713)140ms min Power-On Reset Pulse WidthManual Reset Input12µA Supply CurrentGuaranteed Reset Valid to VCC= +1VPower-Supply Transient ImmunityNo External Components4-Pin SC70 Package
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input19-1623; Rev 0; 1/00
Note:These parts are offered in 2.5k or 10k reels and must be
ordered in 2.5k or 10k increments. Order MAX6711_EXS-T for
2.5k reels and MAX6711_EXS-T10 for 10k reels. Insert the
desired suffix letter from the Selector Guide into the blank to
complete the part number.
Ordering Information
Pin ConfigurationTypical Operating Circuit
Selector Guide appears at end of data sheet.
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= full range, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +5V for L/M versions, VCC= +3.3V for
T/S versions, VCC= +3V for R version, VCC= +2.5V for Z version, and 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.
Terminal Voltage (with respect to GND)
VCC........................................................................-0.3V to +6.0V
RESET, RESET(push-pull).........................-0.3V to (VCC+ 0.3V)
RESET(open drain)...............................................-0.3V to +6.0V..............................................................-0.3V to (VCC+ 0.3V)
Input Current, VCC, MR.......................................................20mA
Output Current, RESET, RESET..........................................20mA
Rate of Rise, VCC............................................................100V/µs
Continuous Power Dissipation (TA= +70°C)
4-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
Operating Temperature Range.........................-40°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
Note 1:Production testing done at TA= +25°C; limits over temperature guaranteed by design only.
Note 2:RESEToutput for MAX6711/MAX6713; RESET output for MAX6712.
ELECTRICAL CHARACTERISTICS (continued)(VCC= full range, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +5V for L/M versions, VCC= +3.3V for
T/S versions, VCC= +3V for R version, VCC= +2.5V for Z version, and TA= +25°C.) (Note 1)
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
Typical Operating Characteristics(VCC= full range, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +5V for L/M versions, VCC= +3.3V for
T/S versions, VCC= +3V for R version, VCC= +2.5V for Z version, and TA= +25°C.)
Detailed Description
Reset OutputA microprocessor’s (µP’s) reset input starts the µP in a
known state. The MAX6711/MAX6712/MAX6713 assert
reset to prevent code-execution errors during power-
up, power-down, or brownout conditions. They assert a
reset signal whenever the VCCsupply voltage declines
below a preset threshold, keeping it asserted for at
least 140ms after VCChas risen above the reset thresh-
old. The MAX6713 uses an open-drain output, and the
MAX6711/MAX6712 have a push-pull output stage.
Connect a pull-up resistor on the MAX6713’s RESET
output to any supply between 0 and 6V.
Manual Reset InputMany µP-based systems require manual reset capabili-
ty, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. Reset remains asserted
while MRis low, and for at least 140ms after MRreturns
high. This input has an internal 20kΩpull-up resistor, so
it can be left open if it is not used. MRcan be driven
with TTL- or CMOS-logic levels, or with open-drain/col-
lector outputs. To create a manual reset function, con-
nect a normally open momentary switch from MRto
ground; external debounce circuitry is not required. Ifis driven from long cables or if the device is used in
a noisy environment, connecting a 0.1µF capacitor fromMRto 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, the MAX6711/
MAX6712/MAX6713 are relatively immune to short-dura-
tion negative-going VCCtransients (glitches).
Figure 1 shows typical transient duration vs. reset com-
parator overdrive, for which the MAX6711/MAX6712/
MAX6713 do notgenerate a reset pulse. The graph was
generated using a negative-going pulse applied to VCC,
starting 0.5V above the actual reset threshold and end-
ing below it by the magnitude indicated (reset compara-
tor overdrive). The graph indicates the maximum pulse
width a negative-going VCCtransient can have without
causing a reset pulse. As the magnitude of the transient
increases (goes farther below the reset threshold), the
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
maximum allowable pulse width decreases. Typically, for
the MAX671_L and MAX671_M, a VCCtransient that
goes 100mV below the reset threshold and lasts 20µs or
less will not cause a reset pulse. A 0.1µF bypass capaci-
tor mounted as close as possible to the VCCpin provides
additional transient immunity.
Ensuring a Valid Reset Output
Down to VCC= 0 When VCCfalls below 1V, the MAX6711 RESEToutput
no longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS-logic inputs con-
nected to RESETcan drift to undetermined voltages.
This presents no problem in most applications since
most µP and other circuitry is inoperative with VCC
below 1V. However, in applications where RESETmust
be valid down to 0, adding a pull-down resistor to
RESETcauses any stray leakage currents to flow to
ground, holding RESETlow (Figure 2). R1’s value is not
critical; 100kΩis large enough not to load RESETand
small enough to pull RESETto ground.
A 100kΩpull-up resistor to VCCis also recommended
for the MAX6712 if RESET is required to remain valid for
VCC< 1V.
Interfacing to µPs with
Bidirectional Reset PinsSince the RESEToutput on the MAX6713 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 µP’s RESETpin with a single pull-up resistor
allows either device to assert reset (Figure 3).
MAX6713 Open-Drain RESET Output
Allows Use with Multiple SuppliesGenerally, the pull-up connected to the MAX6713 will
connect to the supply voltage that is being monitored at
the IC’s VCCpin. However, some systems may use the
open-drain output to level-shift from the monitored sup-
ply to reset circuitry powered by some other supply
(Figure 4). Note that as the MAX6713’s VCCdecreases
below 1V, so does the IC’s ability to sink current atRESET. Also, with any pull-up, RESETwill be pulled
high as VCCdecays toward 0. The voltage where this
occurs depends on the pull-up resistor value and the
voltage to which it is connected.
Benefits of Highly Accurate
Reset ThresholdMost µP supervisor ICs have reset threshold voltages
between 5% and 10% below the value of nominal sup-
ply voltages. This ensures a reset will notoccur within
5% of the nominal supply, but will occur when the sup-
ply is 10% below nominal.
When using ICs rated at only the nominal supply ±5%,
a zone of uncertainty where the supply is between 5%
and 10% low, and where the reset may or may not be
asserted is left.
The MAX671_L/T/Z use highly accurate circuitry to
ensure that reset is asserted close to the 5% limit, and
long before the supply has declined to 10% below
nominal.
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset InputTRANSISTOR COUNT:380
___________________Chip Information
