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
(V
CC
= +1.2V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise specified. Typical values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage
SYMBOL
V
CC
CONDITIONS
T
A
= 0°C to +125°C
T
A
= -40°C to 0°C
V
CC
≤ 5.5V
Supply Current
I
CC
V
CC
≤ 3.3V
V
CC
≤ 2.0V
V
CC
Reset Threshold
Hysteresis
V
CC
Reset Threshold
(MAX6752AKA32 Only)
Hysteresis
(MAX6752AKA32 Only)
V
CC
to Reset Delay
Reset Timeout Period
SRT Ramp Current
SRT Ramp Threshold
Normal Watchdog Timeout Period
(MAX6746–MAX6751)
Extended Watchdog Timeout
(MAX6746–MAX6751)
Slow Watchdog Period
(MAX6752/MAX6753)
Fast Watchdog Timeout Period,
SET Ratio = 8,
(MAX6752/MAX6753)
Fast Watchdog Timeout Period,
SET Ratio = 16,
(MAX6752/MAX6753)
t
RP
I
RAMP
V
RAMP
t
WD
t
WD
t
WD2
t
WD1
V
TH
V
HYST
TA = -40°C to +125°C
V
HYST
V
CC
falling from V
TH
+ 100mV to V
TH
-100mV at 1mV/µs
C
SRT
= 1500pF
C
SRT
= 100pF
V
SRT
= 0 to 1.23V; V
CC
= 1.6V to 5V
V
CC
= 1.6V to 5V (V
RAMP
rising)
C
SWT
= 1500pF
C
SWT
= 100pF
C
SWT
= 1500pF
C
SWT
= 100pF
C
SWT
= 1500pF
C
SWT
= 100pF
C
SWT
= 1500pF
C
SWT
= 100pF
C
SWT
= 1500pF
C
SWT
= 100pF
45.53
91.08
728.6
728.6
200
1.173
5.692
5.692
3.136
0.65
0.80
20
7.590
0.506
250
1.235
7.590
0.506
971.5
64.77
971.5
64.77
121.43
8.09
60.71
4.05
75.89
151.80
1214.4
1214.4
300
1.297
9.487
9.487
See V
TH
selection table
T
A
= -40°C to +125°C
V
TH
-
2%
0.8
3.224
0.90
MIN
1.0
1.2
5
4.2
3.7
TYP
MAX
5.5
5.5
10
9
8
V
TH
+
2%
V
%
V
%
µs
ms
nA
V
ms
ms
ms
ms
µA
UNITS
V
t
WD1
ms
www.maximintegrated.com
Maxim Integrated │ 2
MAX6746–MAX6753
μP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
Electrical Characteristics (continued)
(V
CC
= +1.2V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise specified. Typical values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
Fast Watchdog Timeout Period,
SET Ratio = 64,
(MAX6752/MAX6753)
Fast Watchdog Minimum Period
(MAX6752/MAX6753)
SWT Ramp Current
SWT Ramp Threshold
RESET
Output-Voltage Low
Open-Drain, Push-Pull
(Asserted)
RESET
Output-Voltage High,
Push-Pull (Not Asserted)
RESET
Output Leakage Current,
Open Drain
I
RAMP
V
RAMP
V
OL
V
SWT
= 0 to 1.23V, V
CC
= 1.6V to 5V
V
CC
= 1.6V to 5V (V
RAMP
rising)
V
CC
≥ 1.0V, I
SINK
= 50µA
V
CC
≥ 2.7V, I
SINK
= 1.2mA
V
CC
≥
4.5V, I
SINK
= 3.2mA
V
CC
≥ 1.8V, I
SOURCE
= 200µA
V
OH
V
CC
≥ 2.25V, I
SOURCE
= 500µA
V
CC
≥ 4.5V, I
SOURCE
= 800µA
I
LKG
V
CC
> V
TH
, reset not asserted,
V
RESET
= 5.5V
0.8 x V
CC
0.8 x V
CC
0.8 x V
CC
1.0
µA
V
SYMBOL
t
WD1
CONDITIONS
C
SWT
= 1500pF
C
SWT
= 100pF
2000
200
1.173
250
1.235
300
1.297
0.3
0.3
0.4
V
MIN
11.38
TYP
15.18
1.01
MAX
18.98
UNITS
ms
ns
nA
V
DIGITAL INPUTS (MR, SET0, SET1, WDI, WDS)
V
IL
Input Logic Levels
V
IH
V
IL
V
IH
MR
Minimum Pulse Width
MR
Glitch Rejection
MR-to-RESET
Delay
MR
Pullup Resistance
WDI Minimum Pulse Width
RESET IN
RESET IN Threshold
RESET IN Leakage Current
RESET IN to
RESET
Delay
V
RESET IN
I
RESET IN
RESET IN falling at 1mV/µs
T
A
= -40°C to +125°C
1.216
-50
1.235
±1
20
1.254
+50
V
nA
µs
Pullup to V
CC
12
300
V
CC
≥
4.0V
V
CC
< 4.0V
0.7 x V
CC
1
100
200
20
28
µs
ns
ns
kΩ
ns
0.8
2.4
0.3 x V
CC
V
Note 1:
Production testing done at T
A
= +25°C. Over temperature limits are guaranteed by design.
www.maximintegrated.com
Maxim Integrated │
3
MAX6746–MAX6753
μP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
Typical Operating Characteristics
(V
CC
= +5V, T
A
= +25°C, unless otherwise noted.)
MAX6746 toc01
MAX6746 toc02
1000
RESET TIMEOUT PERIOD (ms)
RESET TIMEOUT PERIOD vs. C
SRT
100,000
WATCHDOG TIMEOUT PERIOD (ms)
10,000
1000
100
10
1
0.1
WATCHDOG TIMEOUT PERIOD vs. C
SWT
MAX6746–MAX6751
EXTENDED MODE
6
5
SUPPLY CURRENT (µA)
4
3
2
1
100
1000
10,000
C
SWT
(pF)
100,000
0
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6746 toc03
100
10
NORMAL MODE
1
0.1
100
1000
10,000
C
SRT
(pF)
100,000
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
MAX6746 toc04
NORMALIZED TIMEOUT PERIOD
NORMALIZED TIMEOUT PERIOD
1.10
1.05
1.00
0.95
0.90
0.85
0.80
-50
-25
0
25
50
75
100
125
C
SWT
= 100pF
C
SWT
= 1500pF
TRANSIENT DURATION (µs)
1.15
1.10
1.05
1.00
0.95
0.90
1.15
MAX6746 toc05
150
125
100
75
50
25
0
0
200
400
600
V
TH
= 2.92V
800
RESET OCCURS
ABOVE THE CURVE
C
SRT
= 100pF
C
SRT
= 1500pF
-50
-25
0
25
50
75
100
125
1000
TEMPERATURE (°C)
TEMPERATURE (°C)
RESET THRESHOLD OVERDRIVE (mV)
SUPPLY CURRENT
vs. TEMPERATURE
NORMALIZED RESET THRESHOLD VOLTAGE
MAX6746 toc07
MAX6746 toc08
4
3
2
1
0
V
CC
= 1.8V
V
CC
= 3.3V
1.004
1.002
1.000
0.998
0.996
0.994
0.992
0.990
-50
-25
0
25
50
75
100
125
RESET IN THRESHOLD (V)
5
SUPPLY CURRENT (µA)
V
CC
= 5V
1.008
1.006
V
CC
= 5V
1.239
1.238
1.237
1.236
1.235
-50
-25
0
25
50
75
100
125
1
2
3
4
5
6
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
www.maximintegrated.com
Maxim Integrated │
4
MAX6746 toc08b
6
1.010
NORMALIZED RESET IN THRESHOLD VOLTAGE
vs. TEMPERATURE
RESET IN THRESHOLD
vs. SUPPLY VOLTAGE
1.240
MAX6746 toc06
1.20
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
1.20
NORMALIZED WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE
175
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6746–MAX6753
μP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
Typical Operating Characteristics (continued)
(V
CC
= +5V, T
A
= +25°C, unless otherwise noted.)
MAX6746 toc09
V
CC
FALLING AT 1mV/µs
C
SWT
= C
SRT
= 100pF
MAX6746 toc10
C
SWT
= C
SRT
= 1500pF
RESET
WATCHDOG
V
CC
TO RESET DELAY (µs)
TIMEOUT PERIOD (ms)
TIMEOUT PERIOD (ms)
26.6
26.2
25.8
25.4
25.0
0.56
0.52
0.48
0.44
0.40
8.5
8.0
7.5
7.0
6.5
6.0
-50
-25
0
25
50
75
100
125
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
V
CC
(V)
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
V
CC
(V)
TEMPERATURE (°C)
Pin Configurations
TOP VIEW
RESET IN (MR)
SWT
SRT
1
2
3
+
MAX6746–
MAX6751
8
7
6
5
V
CC
RESET
WDI
WDS
SET0
SWT
SRT
1
2
3
8
V
CC
RESET
WDI
SET1
MAX6752
MAX6753
7
6
5
GND 4
GND 4
SOT23
( ) ARE FOR MAX6746 AND MAX6747 ONLY.
SOT23
Pin Descriptions
PIN
MAX6746
MAX6747
1
—
—
MAX6748–
MAX6751
—
1
—
MAX6752
MAX6753
—
—
1
NAME
FUNCTION
Manual-Reset Input. Pull
MR
low to manually reset the device. Reset
remains asserted for the reset timeout period after
MR
is released.
Reset Input. High-impedance input to the adjustable reset comparator.
Connect RESET IN to the center point of an external resistor-divider to
set the threshold of the externally monitored voltage.
Logic Input. SET0 selects watchdog window ratio or disables the
这标志着在物流供应链打印中处于全球领先地位的美国普印力PRINTRONIX更加看好中国市场，进一步加大在中国的投资力度，依托国际性分销商和本土的行业巨头进一步深入中国市场。 来自政府相关部门的领导、自动识别行业专家、行业客户代表以及新闻媒体出席了新闻发布会，普印力全球高级销售总裁James B. McWilson以及大中华区总经理Roger Zhao出席会议，与闪联总裁孙育宁博士现场...[详细]
“tensymetry”这个词在《韦伯斯特词典》中没有解释，但在医学界却广为人知。由Tensys Medical Systems公司开发的tensymetry是一种使用生物机械、电气、软件工程的专有组合技术。利用这三种强大的技术，你可在手术室内对病人的心跳血压进行精确、连续、实时和非侵入性测量。 该技术结出的果实就是该公司的T-line Tensymeter产品。该产品线的最新进展是去年...[详细]
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