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PDF MAX6453UTS-T Data sheet ( Hoja de datos )
| Número de pieza | MAX6453UTS-T | |
| Descripción | uP Supervisors with Separate VCC Reset and Manual Reset Outputs | |
| Fabricantes | Maxim Integrated | |
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19-2637; Rev 1; 4/03
µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
General Description
The MAX6453–MAX6456 are low-power, dual-voltage
µP supervisors featuring separate VCC reset 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 VCC reset 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 VCC reset output.
The manual reset input of the MAX6455/MAX6456 con-
trols both the manual reset and VCC reset 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).
Applications
Set-Top Boxes
Consumer Electronics
DVD Players
Modems
MP3 Players
Industrial Equipment
Automotive
Medical Devices
Features
o Precision Factory-Set Reset Thresholds From
1.6V to 4.6V
o Adjustable Threshold to Monitor Voltages Down
to 0.63V
o Manual Reset Input with Extended 3.36s Setup
Period
o Immune to Short Voltage Transients
o Low 6µA Supply Current
o Guaranteed Valid Reset Down to VCC = 1.0V
o Active-Low RESET (Push-Pull or Open-Drain)
Outputs
o 140ms (min) Reset Timeout Period
o Small SOT Package
Ordering Information
PART
MAX6453UT_ _S-T
MAX6454UT_ _S-T
MAX6455UT_ _S-T
MAX6456UT_ _S-T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
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.
Pin Configurations
TOP VIEW
RESET 1
6 MR RESET 1
6 MR
MAX6453
MAX6455
GND 2 MAX6454 5 RSTIN GND 2 MAX6456 5 RSTIN
MROUT 3
4 VCC MROUT 3
4 VCC
SOT23-6
SOT23-6
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
µP Supervisors with Separate VCC Reset and
Manual Reset Outputs
PIN
MAX6453
MAX6454
MAX6455
MAX6456
1—
—1
22
33
44
55
6—
—6
Pin Description
NAME
FUNCTION
RESET
GND
MROUT
VCC
RSTIN
MR
Active-Low Push-Pull or Open-Drain Output. RESET changes from high to low when
VCC or RSTIN drops below its selected reset threshold. RESET remains low for the
140ms (min) reset timeout period after all monitored power-supply inputs exceed their
selected reset thresholds. MR does not affect RESET output. For open-drain outputs,
connect to an external pullup resistor.
Active-Low Push-Pull or Open-Drain Output. RESET changes from high to low when
VCC or RSTIN drops below its selected reset threshold. RESET remains low for the
140ms (min) reset timeout period after all monitored power-supply inputs exceed their
selected reset thresholds. RESET changes from high to low after MR input is held low
for the 3.36s (typ) setup period and deasserts 140ms (min) after MR deasserts. For
open-drain outputs, connect to an external pullup resistor.
Ground
Manual Reset Push-Pull or Open-Drain Output. MROUT asserts immediately after MR is
pulled low. MROUT remains low for 140ms (min) after MR is deasserted. For open-
drain outputs, connect to an external pullup resistor.
VCC Voltage Input. Power supply and input for the primary microprocessor voltage
reset monitor.
Reset Input. High-impedance input to the adjustable reset comparator. Connect RSTIN
to the center point of an external resistor divider to set the threshold of the externally
monitored voltage.
Manual Reset Input. Internal 50kΩ pullup to VCC. Pull MR low to immediately assert
MROUT. MR does not affect RESET output.
Manual Reset Input. Internal 50kΩ pullup to VCC. Pull MR low to immediately assert
MROUT. RESET changes from high to low after MR input is held low for the 3.36s (typ)
setup period.
_______________________________________________________________________________________ 5
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