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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6443 Datasheet

(MAX6443 - MAX6452) uP Reset Circuits

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MAX6443–MAX6452
µP Reset Circuits with Long Manual Reset
Setup Period
General Description
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.
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.
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.
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.
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
● Cable/DSL Modems
● MP3 Players
● Industrial Equipment
● Automotive
● Medical Devices
Features
● Single or Dual-Supply Voltage Monitors
● 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
● Guaranteed Valid Reset Down to VCC = 1.0V
● Active-Low RESET (Push-Pull or Open-Drain)
Outputs
● 140ms (min) Reset Timeout Period
● Small SOT143 and SOT23 Packages
● AEC-Q100 Qualified (MAX6444US16K/V+T)
Ordering Information at end of data sheet.
Typical Operating Circuit
+3.3V
VCC
MAX6444
MR1 RESET
GND
VCC
µP
RESET
GND
RESET TIMEOUT PERIOD
MR1 SETUP PERIOD
210ms
tMR
MR1
RESET
19-2656; Rev 6; 3/18


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6443 Datasheet

(MAX6443 - MAX6452) uP Reset Circuits

No Preview Available !

MAX6443–MAX6452
µP Reset Circuits with Long Manual Reset
Setup Period
Absolute Maximum Ratings
(All voltages referenced to GND.)
VCC .........................................................................-0.3V to +6V
Open-Drain RESET .................................................-0.3V to +6V
Push-Pull RESET ..................................... -0.3V to (VCC + 0.3V)
MR1, MR2, MR2, RSTIN .........................................-0.3V to +6V
Input Current, All Pins.......................................................±20mA
Continuous Power Dissipation (TA = +70°C)
4-Pin SOT143 (derate 4.0mW/°C above +70°C).........320mW
5-Pin SOT23 (derate 7.1mW/°C above +70°C)...........571mW
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
Soldering Temperature (reflow)
Lead(Pb)-free............................................................... +260°C
Containing lead.............................................................+240°C
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.
Electrical Characteristics
(VCC = 1.0V to 5.5V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Operating Voltage Range
VCC Supply Current
VCC Reset Threshold
Reset Threshold Tempco
Reset Threshold Hysteresis
RSTIN Threshold
RSTIN Threshold Hysteresis
RSTIN Input Current
RSTIN to Reset Output Delay
Reset Timeout Period
VCC to RESET Output Delay
Manual Reset Minimum Setup
Period Pulse Width
SYMBOL
VCC
ICC
VTH
CONDITIONS
VCC = 5.5V, no load
VCC = 3.6V, no load
46
44
31
29
26
23
22
17
16
VTH-RSTIN
VHYST
IRSTIN
MAX6449–MAX6452
MAX6449–MAX6452
MAX6449–MAX6452
TA = 0°C to +85°C
TA = -40°C to +85°C
MAX6449–MAX6452, VRSTIN falling at
1mV/µs
tRP
tRD VCC falling at 1mV/µs
K
L
tMR S
T
MIN
1.0
4.50
4.25
3.00
2.85
2.55
2.25
2.12
1.62
1.52
0.615
0.610
-25
140
6.72
4.48
2.24
1.12
TYP
7
6
4.63
4.38
3.08
2.93
2.63
2.32
2.19
1.67
1.58
60
2 × VTH
0.630
2.5
15
210
20
10.08
6.72
3.36
1.68
MAX
5.5
20
16
4.75
4.50
3.15
3.00
2.70
2.38
2.25
1.71
1.62
0.645
0.650
+25
280
13.44
8.96
4.48
2.24
UNITS
V
µA
V
ppm/°C
mV
V
mV
nA
µs
ms
µs
s
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX6443
Description (MAX6443 - MAX6452) uP Reset Circuits
Maker Maxim Integrated Products
Total Page 13 Pages
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