Operating Temperature Range ......................... -40°C to +125°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°C
Soldering Temperature (reflow) .......................................+260°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
PARAMETER
Operating Voltage Range
V
CC
Supply Current
(V
CC
= full range, T
A
= -40°C to +125°C, unless otherwise specified. Typical values are at T
A
= +25°C.) (Note 1)
SYMBOL
V
CC
I
CC
CONDITIONS
V
CC
= 5.5V, no load
V
CC
= 2.5V, no load
V
CC
= 1.8V, no load
V
CC
Reset Threshold
(See Reset Thresholds table)
Reset Threshold Tempco
V
CC
to Reset Delay
V
TH
ΔV
TH
/°C
V
CC
falling at 10mV/µs from V
TH
+ 100mV
to V
TH
- 100mV
D1
D2
Reset Timeout Period
MAX6381–MAX6389
(See Reset Timeout table)
D3
t
RP
D5
D6
D4
D7
Reset Timeout Period
MAX6390
MR
timeout period
t
RP
V
CC
timeout period
D4
D7
D4
D7
1
20
140
280
560
1120
1200
140
150
1120
1200
T
A
= +25°C
T
A
= -40°C to +125°C
V
TH
-
1.5%
V
TH
-
2.5%
V
CC
= 3.6V, no load
MIN
1.0
7
6
4
3
V
TH
V
TH
60
35
2
40
280
560
1120
2240
2400
280
300
2240
2400
0.3 x
V
CC
0.7 x
V
CC
0.8
2.4
V
ms
ms
TYP
MAX
5.5
13
11
7
6
V
TH
+
1.5%
V
TH
+
2.5%
V
ppm/°C
µs
µA
UNITS
V
V
IL
MR
Input Voltage
V
IH
V
IH
V
IL
V
TH
< 4V
V
TH
> 4V
www.maximintegrated.com
Maxim Integrated │ 2
MAX6381–MAX6390
SC70/μDFN, Single/Dual Low-Voltage,
Low-Power μP Reset Circuits
Electrical Characteristics (continued)
PARAMETER
MR
Minimum Input Pulse Width
MR
Glitch Rejection
MR
to Reset Delay
MR
Internal Pullup Resistance
RESET IN Input Threshold
RESET IN to RESET Delay
RESET IN Input Leakage Current
Open-Drain
RESET
Output
Voltage
Open-Drain
RESET
Output
Leakage Current
I
RESET IN
V
OL
I
LKG
V
OL
Push-Pull
RESET
Output Voltage
V
OH
V
THRST
SYMBOL
(V
CC
= full range, T
A
= -40°C to +125°C, unless otherwise specified. Typical values are at T
A
= +25°C.) (Note 1)
CONDITIONS
MIN
1
100
200
MAX6381–MAX6389
MAX6390
T
A
= +25°C
T
A
= 0°C to +85°C
32
500
1.245
1.232
1.219
4.5
-50
V
CC
≥ 4.5V, I
SINK
= 3.2mA, reset asserted
V
CC
≥ 1.0V, I
SINK
= 80µA, reset asserted
V
CC
> V
TH
,
RESET
not asserted
V
CC
≥ 4.5V, I
SINK
= 3.2mA, reset asserted
V
CC
≥ 1.0V, I
SINK
= 80µA, reset asserted
V
CC
≥ 4.5V, I
SOURCE
= 800µA, reset not
asserted
V
CC
≥ 2.5V, I
SOURCE
= 500µA, reset not
asserted
V
CC
≥ 4.5V, I
SOURCE
= 800µA, reset
asserted
V
CC
≥ 2.5V, I
SOURCE
= 500µA, reset
asserted
V
CC
≥ 1.8V, I
SOURCE
= 150µA, reset
asserted
V
CC
≥ 1.0V, I
SOURCE
= 1µA, reset asserted
V
CC
≥ 4.5V, I
SINK
= 3.2mA, reset not
asserted
V
CC
≥ 2.5V, I
SINK
= 1.2mA, reset not
asserted
V
CC
≥ 2.5V, I
SINK
= 1.2mA, reset asserted
0.8 x
V
CC
0.8 x
V
CC
0.8 x
V
CC
0.8 x
V
CC
0.8 x
V
CC
0.8 x
V
CC
0.4
0.3
V
V
CC
≥ 2.5V, I
SINK
= 1.2mA, reset asserted
±1
+50
0.4
0.3
0.3
1.0
0.4
0.3
0.3
V
µA
V
63
1560
1.27
100
3000
1.295
1.308
1.321
µs
nA
V
TYP
MAX
UNITS
µs
ns
ns
kΩ
Ω
T
A
= -40°C to +125°C
V
RESETIN
falling at 4mV/µs from
V
THRST
+ 40mV to V
THRST
- 40mV
V
OH
Push-Pull RESET Output Voltage
V
OL
Note 1:
Specifications over temperature are guaranteed by design, not production tested.
www.maximintegrated.com
Maxim Integrated │ 3
MAX6381–MAX6390
SC70/μDFN, Single/Dual Low-Voltage,
Low-Power μP Reset Circuits
Typical Operating Characteristics
SUPPLY CURRENT vs. TEMPERATURE
(NO LOAD)
MAX6381/90 toc01
MAX6381/90 toc02
SUPPLY CURRENT (µA)
7
6
5
4
3
2
1
0
V
CC
= +2.5V
V
CC
= +5.5V
POWER-DOWN RESET DELAY (µs)
8
V
CC
= +3.6V
41
39
37
35
33
31
29
27
25
V
CC
= +3V
NORMALIZED RESET TIMEOUT PERIOD
1.06
1.04
1.02
1.00
0.98
0.96
0.94
V
CC
= +1.8V
V
CC
= +1.8V
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
MAX6381/90 toc04
OUTPUT-VOLTAGE LOW
vs. SINK CURRENT
MAX6381/90 toc05
OUTPUT-VOLTAGE HIGH
vs. SOURCE CURRENT
V
CC
= +2.5V
MAX6381/90 toc06
1.020
NORMALIZED RESET THRESHOLD
1.015
1.010
1.005
1.000
0.995
0.990
0.985
1.2
1.0
0.8
0.6
0.4
0.2
0
V
CC
= +4.5V
3.0
2.5
2.0
V
OH
(V)
1.5
1.0
0.5
0
V
CC
= +1.8V
V
OL
(V)
V
CC
= +3.0V
0.990
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
0
3
6
I
SINK
(mA)
9
12
0
250
500
750
1000
1250
1500
I
SOURCE
(µA)
MAXIMUM TRANSIENT DURATION (µs)
450
400
350
300
250
200
150
100
50
0
1
10
100
RESET ASSERTED
ABOVE THIS LINE
MAX6381/90 toc07
5.3
5.1
RESET IN DELAY (µs)
4.9
4.7
4.5
4.3
4.1
3.9
3.7
3.5
1000
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
RESET COMPARATOR OVERDRIVE, V
TH
- V
CC
(mV)
www.maximintegrated.com
Maxim Integrated │ 4
MAX6381/90 toc08
500
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
5.5
RESET IN TO RESET DELAY
vs. TEMPERATURE
MAX6381/90 toc03
9
43
POWER-DOWN RESET DELAY
vs. TEMPERATURE
1.08
NORMALIZED POWER-UP RESET TIMEOUT
vs. TEMPERATURE
MAX6381–MAX6390
SC70/μDFN, Single/Dual Low-Voltage,
Low-Power μP Reset Circuits
Pin Description
PIN
3-PIN SC70
µDFN
MAX6384/
MAX6381/
MAX6382 MAX6386/
MAX6383
MAX6390
4-PIN SC70
MAX6387/
MAX6385
MAX6388
MAX689
NAME
FUNCTION
1
(MAX6382/
MAX6385/
MAX6388)
2
—
2
—
2
RESET
Active-High Push-Pull Reset Output. RESET
changes from low to high when any monitored
voltage (V
CC
or VRESETIN) drops below the
reset threshold or
MR
is pulled low. RESET
remains high for the reset timeout period
after monitored voltages exceed the reset
thresholds or
MR
is released.
Active-Low Open-Drain/Push-Pull Reset Output.
RESET
changes from high to low when any
monitored voltage (V
CC
or VRESETIN) drops
below the reset threshold or
MR
is pulled low.
RESET
remains low for the reset timeout
period after the monitored voltages exceed the
reset thresholds or
MR
is released. Open-drain
requires an external pullup resistor.
1
(MAX6381/
MAX6383/
MAX6384/
MAX6386/
MAX6387/
MAX6390)
2, 3, 5
(MAX6381/
MAX6382/
MAX6383)
2, 5
(MAX6384–
MAX6390)
3
(MAX6384/
MAX6385/
MAX6386/
MAX6390)
2
—
2
—
2
—
RESET
—
—
—
—
—
—
N.C.
No Connection. Not Internally connected.
—
—
3
3
—
—
MR
Active-Low Manual Reset Input. Drive low to
force a reset. Reset remains active as long as
MR
is low and for the reset timeout period after
MR
is released. Leave unconnected or connect
to V
CC
if unused.
MR
has an internal 63kΩ
(1.56kΩ for MAX6390) pullup resistor to V
CC
.
Auxiliary Reset Input. High-impedance input to
the auxiliary reset comparator. Connect RESET
IN to the center point of an external resistor
voltage-divider network to set the reset threshold
首先在github上下载了DHT系列的驱动库
# DHT11/DHT22 driver for MicroPython on ESP8266
# MIT license; Copyright (c) 2016 Damien P. George
try:
from esp import dht_readinto
......
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该机还搭载了...[详细]
概述： 介绍一种CAN-bus网络与以太网连接，构成一个中型远程监控/数据传输网络的方法。
CAN（Controller Area Network——控制器局域网）是一种由CAN控制器组成的高性能串行数据局域通信网络，是国际上应用最广泛的现场总线之一。它最早由德国Bosch公司于1984年推出，最初用于汽车内部测量与执行部件之间的数据通信。CAN-bus总线模型符合OSI的7层结构...[详细]
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