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
(V
CC
= 1.0V to 5.5V, T
A
= -40°C to +85°C, unless otherwise specified. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Operating Voltage Range
V
CC
Supply Current
SYMBOL
V
CC
I
CC
V
CC
= 5.5V, no load
V
CC
= 3.6V, no load
46
44
31
29
V
CC
Reset Threshold
V
TH
26
23
22
17
16
Reset Threshold Tempco
Reset Threshold Hysteresis
RSTIN Threshold
RSTIN Threshold Hysteresis
RSTIN Input Current
RSTIN to Reset Output Delay
Reset Timeout Period
V
CC
to
RESET
Output Delay
Manual Reset Minimum Setup
Period Pulse Width
t
RP
t
RD
V
CC
falling at 1mV/µs
K
t
MR
L
S
T
6.72
4.48
2.24
1.12
V
TH-RSTIN
MAX6449–MAX6452
V
HYST
I
RSTIN
MAX6449–MAX6452
MAX6449–MAX6452
MAX6449–MAX6452, V
RSTIN
falling at
1mV/µs
140
-25
15
210
20
10.08
6.72
3.36
1.68
13.44
8.96
4.48
2.24
s
280
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
0.615
0.610
2.5
+25
4.50
4.25
3.00
2.85
2.55
2.25
2.12
1.62
1.52
CONDITIONS
MIN
1.0
7
6
4.63
4.38
3.08
2.93
2.63
2.32
2.19
1.67
1.58
60
2 × V
TH
0.630
0.645
0.650
TYP
MAX
5.5
20
16
4.75
4.50
3.15
3.00
2.70
2.38
2.25
1.71
1.62
ppm/°C
mV
V
mV
nA
µs
ms
µs
V
UNITS
V
µA
www.maximintegrated.com
Maxim Integrated
│
2
MAX6443–MAX6452
Electrical Characteristics (continued)
µP Reset Circuits with Long Manual Reset
Setup Period
(V
CC
= 1.0V to 5.5V, T
A
= -40°C to +85°C, unless otherwise specified. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
MR2 Minimum Setup Period
Pulse Width
MR2 Glitch Rejection
MR2 to
RESET
Delay
Manual Reset Timeout Period
MR1
to V
CC
Pullup Impedance
MR2
to V
CC
Pullup Impedance
MAX6445/MAX6446/MAX6449/MAX6450
V
CC
≥ 1.00V, I
SINK
= 50µA,
RESET
asserted
RESET
Output Low
(Open Drain or Push-Pull)
V
CC
≥ 1.20V, I
SINK
= 100µA,
RESET
asserted
V
CC
≥ 2.55V, I
SINK
= 1.2mA,
RESET
asserted
V
CC
≥ 4.25V, I
SINK
= 3.2mA,
RESET
asserted
V
CC
≥ 1.80V, I
SOURCE
= 200µA,
RESET
deasserted
RESET
Output High
(Push-Pull)
V
OH
V
CC
≥ 3.15V, I
SOURCE
= 500µA,
RESET
deasserted
V
CC
≥ 4.75V, I
SOURCE
= 800µA,
RESET
deasserted
RESET
Open-Drain Leakage
Current
MR1, MR2,
MR2
Input Low Voltage
MR1, MR2,
MR2
Input High Voltage
I
LKG
V
IL
V
IH
0.7 × V
CC
RESET
deasserted
0.8 × V
CC
0.8 × V
CC
0.8 × V
CC
1
0.3 × V
CC
µA
V
V
V
t
MRP
SYMBOL
CONDITIONS
MAX6447/MAX6448/MAX6451/MAX6452
MAX6447/MAX6448/MAX6451/MAX6452
MAX6447/MAX6448/MAX6451/MAX6452
140
25
25
MIN
1
100
200
210
50
50
280
75
75
0.3
0.3
V
0.3
0.4
TYP
MAX
UNITS
µs
ns
ns
ms
kW
kW
V
OL
Note 1:
Devices production tested at T
A
= +25°C. Overtemperature limits are guaranteed by design.
www.maximintegrated.com
Maxim Integrated
│
3
MAX6443–MAX6452
µP Reset Circuits with Long Manual Reset
Setup Period
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
8
SUPPLY CURRENT (µA)
7
6
5
4
3
2
1
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
MAX6443/52 toc01
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX6443/52 toc02
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6443/52 toc03
9
1.05
NORMALIZED TIMEOUT PERIOD
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
-40
-15
10
35
60
250
200
150
100
50
0
TRANSIENT DURATION (µs)
RESET OCCURS
ABOVE THE CURVE
V
TH
= 4.4V
0
200
400
600
800
1000
85
TEMPERATURE (°C)
RESET THRESHOLD OVERDRIVE (mV)
NORMALIZED V
CC
RESET THRESHOLD
vs. TEMPERATURE
MAX6443/52 toc04
V
CC
TO RESET DELAY
vs. TEMPERATURE
23.6
V
CC
TO RESET DELAY (µs)
23.2
22.8
22.4
22.0
21.6
21.2
20.8
20.4
20.0
V
CC
= FALLING AT 1mV/µs
MAX6443/52 toc05
RSTIN TO RESET DELAY
vs. TEMPERATURE (RSTIN FALLING)
23.6
RSTIN TO RESET DELAY (µs)
23.2
22.8
22.4
22.0
21.6
21.2
20.8
20.4
20.0
RSTIN FALLING AT 1mV/µs
MAX6443/52 toc06
1.03
NORMALIZED V
CC
RESET THRESHOLD
1.02
1.01
1.00
0.99
0.98
0.97
24.0
24.0
-40
-15
10
35
60
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MANUAL RESET TO RESET DELAY
(MAX6445L/MAX6446L/MAX6449L/MAX6450L)
MAX6443/52 toc07
V
CC
TO
RESET
DELAY
V
CC
= 4.5V
MAX6443/52 toc08
V
CC
= 5V
MR1
(5V/div)
V
TH
= 4.392V
V
CC
= 4.3V
V
CC
(100mV/div)
MR2
(5V/div)
RESET
(5V/div)
TIME (1s/div)
TIME (100µs/div)
RESET
(2V/div)
www.maximintegrated.com
Maxim Integrated
│
4
MAX6443–MAX6452
µP Reset Circuits with Long Manual Reset
Setup Period
Pin Description
PIN
MAX6443
MAX6444
1
MAX6445
MAX6446
2
MAX6447
MAX6448
2
MAX6449
MAX6450
2
MAX6451
MAX6452
2
NAME
GND
Ground
Active-Low Push-Pull or Open-Drain Output.
RESET
changes from high to low when V
CC
or RSTIN drops below
its selected reset threshold and remains low for the 210ms
reset timeout period after all monitored power-supply inputs
exceed their selected reset thresholds.
RESET
is one-shot
pulsed low for the reset timeout period (140ms min) after
selected manual reset inputs are asserted longer than the
specified setup period. For the open-drain output, use a
minimum 20kW pullup resistor to V
CC
.
Manual Reset Input, Active Low. Internal 50kW pullup to
V
CC
. Pull
MR1
low for the typical input pulse width (t
MR
)
to one-shot pulse
RESET
for the reset timeout period.
Manual Reset Input, Active Low. Pull both
MR1
and
MR2
low for the typical input pulse width (t
MR
) to one-
shot pulse
RESET
for the reset timeout period.
V
CC
Voltage Input. Power supply and input for the
primary microprocessor voltage reset monitor.
Manual Reset Input, Active Low. Internal 50kW pullup to
V
CC
. Pull both
MR1
and
MR2
low for the typical input
pulse width (tMR) to one-shot pulse
RESET
for the reset
timeout period.
Manual Reset Input. Pull the MR2 high to immediately
one-shot pulse
RESET
for the reset timeout period.
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.
FUNCTION
2
1
1
1
1
RESET
3
—
3
—
3
MR1
—
4
3
4
—
4
3
4
—
4
V
CC
—
5
—
6
—
MR2
—
—
5
—
6
MR2
—
—
—
5
5
RSTIN
Detailed Description
Reset Output
The 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 MAX6443–
MAX6452 µP supervisory circuits provide the reset
logic to prevent code-execution errors during power-
With the rapid development of science and technology, especially the widespread application of digital technology and various ultra-large-scale integrated circuits, electronic equipment, especially...[Details]
China's new energy vehicles are in a transition period from research and development to real industrial development. In 2012, with the intensive launch of new energy vehicle policy planning, the de...[Details]
The Mobile Industry Processor Interface (MIPI) Alliance is an organization responsible for promoting the standardization of software and hardware in mobile devices. It has released the D-PHY specif...[Details]
1 Introduction
Ultrasonic waves have strong directivity, slow energy consumption, and can propagate over long distances in a medium, so they are used for distance measurement. Ultrasonic detec...[Details]
Instrument stepper motor
The stepper motor is an open-loop control element that converts electrical pulse signals into angular displacement or linear displacement. In the case of non...[Details]
introduction
MAX6636 is a multi-channel precision temperature monitor that can not only monitor local temperature, but also connect up to 6 diodes externally. Each channel has a programmable...[Details]
LED lighting: Basic circuit design can be completed in as little as one day
Semiconductor manufacturers are also getting involved in the LED lighting business. The power circuit of LED req...[Details]
Traditional
virtual instruments
consist of a data acquisition
board
based on PCI bus and
corresponding software. However, with
the rapid development of
computer
network techno...[Details]
The ARINC429 bus is one of the most commonly used communication buses between various subsystems of avionics. As the "skeleton" of modern avionics systems, once the bus system or the attached airbo...[Details]
introduction
When it comes to the production of mobile phone lithium-ion batteries, the first thing that comes to mind is Japan's industrialized mechanical assembly line, NOKIO, MOTOLROLA's st...[Details]
Microcontrollers are something that many people want to learn about and are concerned about. In most websites, the hardware requirements are generally as follows:
1. You need a computer, prefer...[Details]
New Automobile
Hydraulic Clutch
The hydraulic control system uses almost 100% advanced engineering plastics, which overcomes the shortcomings of the main and branch cylinders of metal clutc...[Details]
In the test of the electronic ignition module, in order to simulate the real working conditions of the electronic ignition system, the electronic ignition module is often placed in an environment h...[Details]
An intelligent vehicle is a robot that can automatically drive in an environment according to a pre-set mode, or it can autonomously perform specific operations according to the on-site situation. ...[Details]
京公网安备 11010802033920号
EEWORLD
