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MAX6454UT29S
uP Supervisors with Separate VCC Reset and Manual Reset Outputs
General DescriptionThe MAX6453–MAX6456 are low-power, dual-voltage
µP supervisors featuring separate VCCreset and manu-
al reset outputs. The dual outputs support both soft-
system reset (interrupt) and hard-system reset (reboot)
functions. The reset output asserts when any of the
monitored voltages falls below its specified threshold
and remains asserted for the reset timeout (140ms min)
after all voltages exceed their respective reset thresh-
olds. All devices are offered with nine factory-fixed
reset thresholds for monitoring primary system voltages
(VCC) from 1.8V to 5V and an adjustable reset input for
monitoring a secondary system voltage down to 0.63V.
Each device has a manual reset input, a VCCreset out-
put, and a manual reset output. The MAX6453/
MAX6454 manual reset output asserts when the manual
reset input is low. It remains asserted for the manual
reset timeout period (140ms min) after the manual reset
input transitions high. The MAX6453/MAX6354 manual
reset input controls only the manual reset output and
does not affect the VCCreset output.
The manual reset input of the MAX6455/MAX6456 con-
trols both the manual reset and VCCreset outputs. When
the manual reset input is low for less than 3.3s (typ), only
the manual reset output asserts and remains asserted for
the manual reset timeout period (140ms min) after the
manual reset input transitions high. If the manual reset
input is low for at least 3.3s (typ), the reset output also
asserts and remains asserted for the reset timeout peri-
od (140ms min) after the manual reset input transitions
high. This enhanced feature allows the implementation of
a soft/hard-system reset combination.
The MAX6453/MAX6455 have active-low push-pull
reset and manual reset outputs, and the MAX6454/
MAX6456 have active-low open-drain reset and manual
reset outputs. All devices are available in small SOT23-
6 packages and are fully specified over the extended
temperature range (-40°C to +85°C).
ApplicationsSet-Top Boxes
Consumer Electronics
DVD Players
Modems
MP3 Players
Industrial Equipment
Automotive
Medical Devices
FeaturesPrecision Factory-Set Reset Thresholds From
1.6V to 4.6V Adjustable Threshold to Monitor Voltages Down
to 0.63VManual Reset Input with Extended 3.36s Setup
Period Immune to Short Voltage Transients Low 6µA Supply CurrentGuaranteed Valid Reset Down to VCC= 1.0VActive-Low RESET(Push-Pull or Open-Drain)
Outputs140ms (min) Reset Timeout PeriodSmall SOT Package
MAX6453–MAX6456
µP Supervisors with Separate VCCReset and
Manual Reset Outputs
Pin Configurations
Ordering Information19-2637; Rev 1; 4/03
Note:The “_” is a placeholder for the threshold voltage level of
the devices. A desired threshold level is set by the part num-
ber suffix found in Table 1. All devices are available in tape-
and-reel only. There is a 2500-piece minimum order increment
for standard versions (Table 2). Sample stock is typically held
on standard versions only. Nonstandard versions require a
minimum order increment of 10,000 pieces. Contact factory for
availability.
Selector Guide appears at end of data sheet.
MAX6453–MAX6456
µP Supervisors with Separate VCCReset and
Manual Reset Outputs
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.
(All voltages referenced to GND)
VCC..........................................................................-0.3V to +6V
Open-Drain RESET, MROUT....................................-0.3V to +6V
Push-Pull RESET, MROUT..........................-0.3V to (VCC+ 0.3V)
MR, RSTIN ...............................................................-0.3V to +6V
Input Current, All Pins.......................................................±20mA
Continuous Power Dissipation (TA= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C).............696mW
Operating Temperature Range..........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS
MAX6453–MAX6456
µP Supervisors with Separate VCCReset and
Manual Reset Outputs
ELECTRICAL CHARACTERISTICS (continued)(VCC= 1.0V to 5.5V, TA= -40°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.) (Note 1)
MAX6453–MAX6456
µP Supervisors with Separate VCCReset and
Manual Reset Outputs
Typical Operating Characteristics(VCC= 3.3V, TA = +25°C, unless otherwise noted.)
MAX6453–MAX6456
µP Supervisors with Separate VCCReset and
Manual Reset Outputs
Pin Description
MAX6453–MAX6456
µP Supervisors with Separate VCCReset and
Manual Reset Outputs
Detailed Description
Reset OutputThe reset output is typically connected to the reset
input of a microprocessor (µP). A µP’s reset input starts
or restarts the µP in a known state. The MAX6453–
MAX6456 µP supervisory circuits provide the reset
logic to prevent code-execution errors during power-
up, power-down and brownout conditions (see the
Typical Operating Circuit).
RESETchanges from high to low whenever the moni-
tored voltage (RSTIN or VCC) drops below the reset
threshold voltages. When VRSTINand VCCexceed their
respective reset threshold voltages, RESETremains low
for the reset timeout period, and then goes high. RESET
changes from high to low after MRinput is held low for
the 3.36s (typ) setup period and deasserts 140ms (min)
after MRdeasserts.
RESETis guaranteed to be in the proper output logic
state for VCCinputs ≥1V. For applications requiring valid
reset logic when VCCis less than 1V, see the Ensuring a
Valid RESETOutput Down to VCC= 0Vsection.
Manual Reset The MAX6453/MAX6454 contain a manual reset output
(MROUT) that asserts low immediately after driving MR
low and remains low for the reset timeout period afterMRgoes high (Figure 1). The pushbutton manual reset
has no effect on the RESEToutput. MROUToutput can
be used to drive an NMI (nonmaskable interrupt) on the
processor to save valuable data.
The MAX6455/MAX6456’s MROUTis asserted immedi-
ately upon driving MRlow. Driving MRlow for longer
than the 3.36s (typ) setup period asserts RESET. Whenis deasserted, MROUTand RESETremain asserted
low for the reset timeout period after MRgoes high
(Figure 2).
Adjustable Input Voltage (RSTIN)The MAX6453–MAX6456 monitor the voltage on RSTIN
using an adjustable reset threshold set with an external
resistor voltage divider (Figure 3). Use the following for-
mula to calculate the externally monitored voltage
(VMON-TH):
VMON-TH= VTH-RSTIN✕(R1 +R2) / R2
where VMON_THis the desired reset threshold voltage
and VTH-RSTINis the reset input threshold (0.63V).
Resistors R1 and R2 can have very high values to mini-
mize current consumption due to low leakage currents.
Set R2 to some conveniently high value (250kΩ, for
example) and calculate R1 based on the desired reset
threshold voltage, using the following formula:
R1 = R2 ✕(VMON_TH/ VTH- 1)Ω
