Containing Lead ..........................................................+240°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
= 1.0V 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
VCC
ICC
V
CC
= 5.5V, no load
V
CC
= 3.6V, no load
46
44
31
29
V
CC
Reset Threshold
VTH
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
MR
Minimum Setup Period
(Pulse Width)
MR
Minimum Input Pulse
MR
Glitch Rejection
MR
to MROUT Delay
Manual Reset Timeout Period
t
MRP
140
t
RP
t
RD
t
MR
V
CC
falling at 1mV/µs
K
MR
to
RESET
L
S
T
RESET
asserted, MAX6455/MAX6456
6.72
4.48
2.24
1.12
2.24
V
TH-RSTIN
V
HYST
I
RSTIN
V
RSTIN
falling at 1mV/µs
140
-25
15
210
20
10.08
6.72
3.36
1.68
3.36
100
200
210
280
13.44
8.16
4.48
2.24
4.48
s
ns
ns
ms
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
MAX6453–MAX6456
µP Supervisors with Separate V
CC
Reset and
Manual Reset Outputs
Electrical Characteristics (continued)
(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
MR
to V
CC
Pullup Impedance
V
CC
≥ 1.00V, I
SINK
= 50µA, outputs
asserted
RESET, MROUT
Output Low
(Open Drain or Push-Pull)
V
CC
≥ 1.20V, I
SINK
= 100µA, outputs
asserted
V
CC
≥ 2.55V, I
SINK
= 1.2mA, outputs
asserted
V
CC
≥ 4.25V, I
SINK
= 3.2mA, outputs
asserted
V
CC
≥ 1.80V, I
SOURCE
= 200µA,
outputs deasserted
RESET, MROUT
Output High
(Push-Pull)
V
OH
V
CC
≥ 3.15V, I
SOURCE
= 500µA,
outputs deasserted
V
CC
≥ 4.75V, I
SOURCE
= 800µA,
outputs deasserted
RESET, MROUT
Output
Open-Drain Leakage Current
MR
Input Low Voltage
MR
Input High Voltage
I
LKG
V
IL
V
IH
0.7 × V
CC
Outputs deasserted
0.8 × V
CC
0.8 × V
CC
0.8 × V
CC
1
0.3 × V
CC
µA
V
V
V
SYMBOL
CONDITIONS
MIN
25
TYP
50
MAX
75
0.3
0.3
V
0.3
0.4
UNITS
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
MAX6453–MAX6456
µP Supervisors with Separate V
CC
Reset and
Manual Reset Outputs
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6453 toc01
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
MAX6453 toc02
SUPPLY CURRENT (µA)
7
6
5
4
3
2
1
0
TRANSIENT DURATION (µs)
T
A
= +25°C
NORMALIZED TIMEOUT PERIOD
8
T
A
= +85°C
200
150
100
50
0
RESET OCCURS
ABOVE THE CURVE
T
A
= -40°C
V
TH
= 4.4V
0
200
400
600
800
1000
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
-40
-15
10
35
60
85
TEMPERATURE (°C)
RESET THRESHOLD OVERDRIVE (mV)
NORMALIZED V
CC
RESET THRESHOLD
vs. TEMPERATURE
MAX6453 toc04
V
CC
TO RESET DELAY
vs. TEMPERATURE
MAX6453 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
MAX6453 toc06
1.03
NORMALIZED V
CC
RESET THRESHOLD
1.02
1.01
1.00
0.99
0.98
0.97
24.0
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
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
MROUT
AND
RESET
DELAY (MAX6455/MAX6456)
V
CC
TO RESET DELAY
MAX6453 toc08
MAX6453 toc07
V
CC
= 5V
MR
(5V/div)
V
CC
= 4.5V
V
TH
= 4.392V
V
CC
= 4.3V
MROUT
(5V/div)
V
CC
(100mV/div)
RESET
(5V/div)
RESET (2V/div)
TIME (1s/div)
TIME (100µs/div)
www.maximintegrated.com
Maxim Integrated
│
4
MAX6453 toc03
9
1.05
250
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6453–MAX6456
µP Supervisors with Separate V
CC
Reset and
Manual Reset Outputs
Pin Description
PIN
MAX6453
MAX6454
MAX6455
MAX6456
NAME
FUNCTION
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.
RESET
remains low for the
140ms (min) reset timeout period after all monitored power-supply inputs exceed their
selected reset thresholds.
MR
does not affect
RESET
output. For open-drain outputs,
connect to an external pullup resistor.
RESET
—
1
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.
RESET
remains low for the
140ms (min) reset timeout period after all monitored power-supply inputs exceed their
selected reset thresholds.
RESET
changes from high to low after
MR
input is held
low for the extended (typ) setup timeout period and deasserts 140ms (min) after
MR
deasserts. For open-drain outputs, connect to an external pullup resistor.
Ground
Manual Reset Push-Pull or Open-Drain Output.
MROUT
asserts immediately after
MR
is pulled low.
MROUT
remains low for 140ms (min) after
MR
is deasserted. For open-
drain outputs, connect to an external pullup resistor.
V
CC
Voltage Input. Power supply and input for the primary microprocessor voltage reset
monitor.
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
便携式医疗设备的特殊性决定了它们应该是对用户友好的、必须工作在无菌环境下，并且空间占用小、耗能低。 同时，便携式医疗设备还需要足够的计算能力以便处理医疗数据，能够连接到无线或有线接口以便记录和发送数据。从设计人员的角度考虑，上述需求需要低功耗的单片机（MCU）和数字信号控制器（Digital Signal Controller，DSC）。 正是有了嵌入式处理器，设计人员才有可能设...[详细]
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