MAX6443–MAX6452
µP Reset Circuits with Long Manual Reset
Setup Period
General Description
Features
● Single or Dual-Supply Voltage Monitors
The MAX6443–MAX6452 low-current microprocessor
reset circuits feature single or dual manual reset inputs
with an extended setup period. Because of the extended
setup period, short switch closures (nuisance resets) are
ignored.
● Precision Factory-Set Reset Thresholds from
1.6V to 4.6V
● Adjustable Threshold to Monitor Voltages Down to
0.63V (MAX6449–MAX6452)
● Single or Dual Manual Reset Inputs with Extended
Setup Period
● Optional Short Setup Time Manual Reset Input
(MAX6447/MAX6448 and MAX6451/MAX6452)
● Immune to Short Voltage Transients
● Low 6µA Supply Current
On all devices, the reset output asserts when any of
the monitored supply voltages drops below its specified
threshold. The reset output remains asserted for the reset
timeout period (210ms typ) after all monitored supplies
exceed their reset thresholds. The reset output is one-
shot pulse asserted for the reset timeout period (140ms
min) when selected manual reset input(s) are held low for
an extended setup timeout period. These devices ignore
manual reset transitions of less than the extended setup
timeout period.
● Guaranteed Valid Reset Down to V
= 1.0V
CC
● Active-Low RESET (Push-Pull or Open-Drain)
Outputs
● 140ms (min) Reset Timeout Period
● Small SOT143 and SOT23 Packages
The MAX6443–MAX6448 are single fixed-voltage µP
supervisors. The MAX6443/MAX6444 have a single
extended manual reset input. The MAX6445/MAX6446
have two extended manual reset inputs. The MAX6447/
MAX6448 have one extended and one immediate manual
reset input.
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
4 SOT143
MAX6443US_ _ _+T
-40°C to +85°C
MAX6444US_ _ _+T
-40°C to +85°C
4 SOT143
4 SOT143
MAX6444US_ _ _/V+T* -40°C to +85°C
The MAX6449–MAX6452 have one fixed-threshold µP
supervisor and one adjustable-threshold µP supervisor.
The MAX6449/MAX6450 have two delayed manual reset
inputs. The MAX6451/MAX6452 have one delayed and
one immediate manual reset input.
Note: The first “_ _” is a placeholder for the threshold voltage level
of the devices. A desired threshold level is set by the two-number
suffix found in Table 1. The third “_” is a placeholder for the manual
reset setup period of the devices. A desired setup period is set by
the letter suffix found in Table 2. 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 stan-
dard versions only. Nonstandard versions require a minimum order
increment of 10,000 pieces. Contact factory for availability.
Most devices are available in lead(Pb)-free packaging only. See
Ordering Information for devices available in both leaded and
lead(Pb)-free packaging.
The MAX6443–MAX6452 have an active-low RESET with
push-pull or open-drain output logic options. These devic-
es, offered in small SOT packages, are fully guaranteed
over the extended temperature range (-40°C to +85°C).
Applications
● Set-Top Boxes
● Consumer Electronics
● DVD Players
/V denotes an automotive qualified part.
*Future product—contact factory for availability.
+Denotes Lead(Pb)-free packages and - denotes leaded packages.
For top mark information, please go to https://www.maximinte-
grated.com/en/design/packaging/topmark/.
● Cable/DSL Modems
● MP3 Players
Pin Configurations
● Industrial Equipment
● Automotive
● Medical Devices
TOP VIEW
1
4
3
GND
V
CC
MAX6443
MAX6444
Ordering Information continued at end of data sheet.
2
MR1
RESET
SOT143
Pin Configurations continued at end of data sheet.
19-2656; Rev 5; 12/15