Power Dissipation, Any Package ....................................380mW
Storage Temperature Range ............................ -55°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°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
= +5V, CTL = GND on MAX700, T
A
= +25°C, unless otherwise noted.)
PARAMETER
V
CC
Monitor Voltage Range
(MAX700 Only)
Min V
CC
for Valid Reset Output,
Declining Supply
Supply Current
Reset Threshold
Internal Hysteresis
Reset Output Pulse Width
RESET Fall Time
V
CC
Pulse Duration
Guaranteeing
MR Input Threshold
MR Pullup Current
MAX700
RESET Output Low
I
SINK
= 3.2mA, V
CC
= 5V
I
SINK
= 1.6mA, V
CC
= 3V
I
SOURCE
= 3.2mA, V
CC
= 4.25V
RESET Output High
I
SOURCE
= 1.6mA, V
CC
= 3V
I
SOURCE
= 0.5mA, V
CC
= 1.5V
I
SINK
= 16mA, V
CC
= 4.25V
RESET
Output Low
I
SINK
= 1.6mA, V
CC
= 3V
I
SINK
= 0.4mA, V
CC
= 1.5V
RESET
Output High
I
SOURCE
= 3.2mA, V
CC
= 5V
I
SOURCE
= 1.6mA, V
CC
= 3V
V
CC
- 0.4
V
CC
- 0.4
V
CC
- 0.4
V
CC
- 0.4
V
CC
- 0.4
0.4
0.4
0.4
V
V
V
0.4
0.4
V
MAX700/MAX701 only, C
LOAD
= 100pF
5V to 4V V
CC
pulse
No reset
Reset
100
T
A
= T
MIN
to T
MAX
HYST not connected
200
Power-up
Power-down
4.50
4.50
CONDITIONS
T
A
= T
MIN
to T
MAX
, CTL = V
CC
T
A
= T
MIN
to T
MAX
, V
RESET
≤ 0.4V when sinking 1mA
MIN
3
1.5
1
100
4.65
4.62
30
350
200
10
10
0.7
-5
-30
1
500
200
4.75
4.75
TYP
MAX
15
UNITS
V
V
µA
V
mV
ms
ns
µs
V
µA
www.maximintegrated.com
Maxim Integrated
│
2
MAX700/MAX701/MAX702
Power-Supply Monitor with Reset
Electrical Characteristics (continued)
(V
CC
= +5V, CTL = GND on MAX700, T
A
= +25°C, unless otherwise noted.)
PARAMETER
MAX701
RESET Output Low
RESET Output High
I
SINK
= 16mA, V
CC
= 5V
I
SOURCE
= 3.2mA, V
CC
= 4.25V
I
SOURCE
= 1.6mA, V
CC
= 3V
I
SOURCE
= 0.5mA, V
CC
= 1.5V
I
SINK
= 3.2mA, V
CC
= 4.25V
RESET
Output Low
RESET
Output High
MAX702
I
SINK
= 3.2mA, V
CC
= 4.25V
RESET
Output Low
RESET
Output High
SENSE Input Threshold
SENSE Input Current
HYST Input On-Resistance
CTL Input Threshold
CTL Pulldown Current
I
SINK
= 1.6mA, V
CC
= 3V
I
SINK
= 0.4mA, V
CC
= 1.5V
I
SOURCE
= 3.2mA, V
CC
= 5V
T
A
= T
MIN
to T
MAX
V
CC
- 0.4
1.25
1.29
0.1
0.5
2
30
100
1.35
MAX700 ONLY (CTL = VCC, unless otherwise noted)
V
nA
kΩ
V
µA
0.4
0.4
0.4
V
V
ISINK = 1.6mA, V
CC
= 3V
ISINK = 0.4mA, V
CC
= 1.5V
I
SOURCE
= 3.2mA, V
CC
= 5V
V
CC
- 0.4
V
CC
- 0.4
V
CC
- 0.4
V
CC
- 0.4
0.4
0.4
0.4
V
V
V
0.4
V
CONDITIONS
MIN
TYP
MAX
UNITS
www.maximintegrated.com
Maxim Integrated
│
3
MAX700/MAX701/MAX702
Power-Supply Monitor with Reset
Pin Description
PIN
MAX700
1
2
MAX701
1
—
MAX702
1
—
NAME
MR
SENSE
FUNCTION
Input for Manual Pushbutton Reset. Has internal 5µA pullup. Low input activates the
RESET/RESET outputs.
The voltage-sense input when CTL = V
CC
. Its threshold is 1.29V. SENSE always
remains connected to the internal comparator. So, when V
CC
is being monitored
internally (CTL = GND), SENSE should be left open circuit.
Normally NOT used when voltage is monitored through V
CC
(CTL = GND). When
monitoring through SENSE (CTL = V
CC
), HYST allows hysteresis to be added,
reducing noise and spurious reset activity (Figure 3). HYST turns on 5µs before the
RESET/RESET
outputs are activated, and its on-resistance to GND is typically 1kΩ.
Ground
Goes low when VCC falls below 4.65V, or when CTL = V
CC
on the MAX700 goes low
when SENSE falls below 1.29V.
Inverted Version of
RESET
When CTL = GND, V
CC
is monitored by the reset circuit. When CTL = V
CC
, V
CC
is ignored and SENSE is monitored, allowing the threshold to be set with external
resistors.
Chip Power and +5V Sensing Input (When CTL = GND on MAX700)
No Connection
3
—
—
HYST
4
5
6
7
8
—
4
6
5
—
8
2, 3, 7
3
7
—
—
2
4, 5, 6, 8
GND
RESET
RESET
CTL
V
CC
N.C.
www.maximintegrated.com
Maxim Integrated
│
4
MAX700/MAX701/MAX702
Power-Supply Monitor with Reset
MR 1
1M
8 V
CC
7 CTL
COMPARATOR
SENSE 2
MAX700
1.29VREF
150k
MANUAL
RESET
BUTTON
1
2
3
MAX700
MR
SENSE
HYST
GND
V
CC
CTL
RESET
RESET
8
7
6
5
+5V
N.C.
R RC
R
OSC
6 RESET
N.C.
TO µP
4
HYST 3
5
RESET
GND 4
Figure 1. MAX700 Block Diagram
Figure 2. MAX700 Typical Connection Diagram
MANUAL
RESET
BUTTON
R1
1
2
MAX700
MR
SENSE
V
CC
CTL
8
7
V
IN
3V TO 15V
RESET
2V/div
V
IN
R2
R3
3
4
HYST
GND
RESET
RESET
6
5
0V
N.C.
TO µP
V
CC
0V
1s/div
2V/div
R1 = R2
V
(
1.29 - 1
)
V = LOWER VOLTAGE THRESHOLD
L
L
R3 =
V
T
R1
V = UPPER VOLTAGE THRESHOLD
V
U
- V
L U
HYSTERESIS = V
U
- V
L
Figure 3. MAX700 Connected for External Senses and
Hysteresis
Figure 4. Typical MAX700/MAX701/MAX702 RESET Output vs.
V
CC
Figure 4 shows the
RESET
output of the MAX700/
MAX701/MAX702 in the correct state for V
CC
voltages
down to 0V. Note the effect of the built-in hysteresis on
the trigger lever of
RESET.
Package Information
For the latest package outline information and land patterns
(footprints), go to
www.maximintegrated.com/packages.
Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
/*****************************************************
This program was produced by the
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1 Introduction
In the mid-1960s, American scientist Maas conducted extensive experimental research on the charging process of open-cell batteries and proposed an acceptable charging curve for ...[详细]
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