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)
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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-
便携式数字数据采集系统（PDDAS）使用了LabVIEW实时模块和PXI，以控制风洞测试和采集记录来自128个不同通道的空气压力数据 "通过LabVIEW实时模块，可以在各种操作情况下获得采集空气压力数据及向风洞提供反馈控制信号所需的确定性响应时间。" – Dave Scheibenhoffer, G Systems 挑战: 用一个可采集、分析和存储来自下一代喷气式战斗机引擎设计的动...[详细]
引 言 MAX6636是一个多通道的精密温度监测器，它不仅能监测本地温度，并且外部最多能接6个二极管。每一通道都具有可编程过低温度报警，1、4、5和6通道还具有可编程过高温度报警。当某一通道测得的温度达到其预先设定的极限值时，状态寄存器的相应位就会被置位。MAX6636最显著的优点是采用了微型20引脚TSS OP 封装，能够监测 CPU 和其他4个位置的温度，主要应用于台式电脑、笔记...[详细]
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