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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6443 Datasheet

(MAX6443 - MAX6452) uP Reset Circuits

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MAX6443 pdf
19-2656; Rev 1; 1/03
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 6.72s 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 of 6.72s.
These devices ignore manual reset transitions of less
than 6.72s (typ).
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
devices, offered in small SOT packages, are fully guar-
www.DaantateSehedeto4vUe.crotmhe 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 Single- or Dual-Supply Voltage Monitors
o Precision Factory-Set Reset Thresholds from
1.6V to 4.6V
o Adjustable Threshold to Monitor Voltages Down
to 0.63V (MAX6449–MAX6452)
o Single or Dual Manual Reset Inputs with Extended
6.72s Setup Period
o Optional Short Setup Time Manual Reset Input
(MAX6447/MAX6448 and MAX6451/MAX6452)
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 SOT143 and SOT23 Packages
Ordering Information
PART
MAX6443 US_ _L -T
MAX6444 US_ _L -T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
4 SOT143-4
4 SOT143-4
Note: The “_ _ ” is a placeholder for the threshold voltage level
of the devices. A desired threshold level is set by the two-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.
Pin Configurations
TOP VIEW
GND 1
RESET 2
MAX6443
MAX6444
4 VCC
3 MR1
SOT143
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6443 Datasheet

(MAX6443 - MAX6452) uP Reset Circuits

No Preview Available !

MAX6443 pdf
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 SOT143-4 (derate 4.0mW/°C above +70°C) .....320mW
5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) .......571mW
6-Pin SOT23-6 (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
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
SYMBOL
CONDITIONS
MIN TYP MAX
Operating Voltage Range
VCC Supply Current
VCC
ICC
VCC = 5.5V, no load
VCC = 3.6V, no load
46
1.0 5.5
7 20
6 16
4.50 4.63 4.75
44 4.25 4.38 4.50
31 3.00 3.08 3.15
29 2.85 2.93 3.00
VCC Reset Threshold
VTH 26
23
2.55 2.63 2.70
2.25 2.32 2.38
22 2.12 2.19 2.25
www.DataSheet4U.com
17
16
1.62 1.67 1.71
1.52 1.58 1.62
Reset Threshold Tempco
Reset Threshold Hysteresis
RSTIN Threshold
RSTIN Threshold Hysteresis
RSTIN Input Current
VTH-RSTIN
VHYST
IRSTIN
MAX6449MAX6452
MAX6449MAX6452
MAX6449MAX6452
TA = 0°C to +85°C
TA = -40°C to +85°C
0.615
0.610
-25
60
2 × VTH
0.630
2.5
0.645
0.650
+25
RSTIN to Reset Output Delay
MAX6449MAX6452, VRSTIN falling at
1mV/µs
15
Reset Timeout Period
VCC to RESET Output Delay
MR1 Minimum Setup Period
Pulse Width
tRP
tRD VCC falling at 1mV/µs
tMR
140 210 280
20
4.48 6.72 8.96
MR1 + MR2 Minimum Setup
Period Pulse Width
MAX6445/MAX6446/MAX6449/MAX6450
4.48 6.72 8.96
UNITS
V
µA
V
ppm/°C
mV
V
mV
nA
µs
ms
µs
s
s
2 _______________________________________________________________________________________


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