MAX700CSA [ROCHESTER]
Power Supply Support Circuit, Adjustable, 1 Channel, CMOS, PDSO8, SOP-8;
| 型号： | MAX700CSA |
| 厂家： | 
Rochester Electronics |
| 描述： | Power Supply Support Circuit, Adjustable, 1 Channel, CMOS, PDSO8, SOP-8 输入元件 光电二极管 |
| 文件： | 总7页 (文件大小：735K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2690; Rev 2; 12/07
Power-Supply Monitor with Reset
1/MAX702
General Description
Features
♦ Min 200ms RESET Pulse on Power-Up, Power-
The MAX700/MAX701/MAX702 are supervisory circuits
used to monitor the power supplies in microprocessor
(µP) and digital systems. The RESET/RESET outputs of
the MAX700/MAX701/MAX702 are guaranteed to be in
Down, and During Low-Voltage Conditions
♦ Reset Threshold Factory Trimmed for +5V
Systems
the correct state for V voltages down to +1V (Figure 4).
CC
♦ No External Components or Adjustments with
They provide excellent circuit reliability and low cost by
eliminating external components and adjustments when
used with +5V-powered circuits.
+5V-Powered Circuits
♦ Debounced Manual Reset Input
♦ Preset or Adjustable Voltage Detection (MAX700)
♦ Adjustable Hysteresis (MAX700)
The MAX702 is the simplest part in the family. When
V
CC
falls to 4.65V, RESET goes low. The MAX702 also
provides a debounced manual reset input. The
MAX701 performs the same functions but has both
RESET and RESET outputs. Their primary function is to
provide a system reset. Accordingly, an active reset
signal is supplied for low supply voltages and for at
least 200ms after the supply voltage reaches its operat-
ing value.
♦ 8-Pin PDIP and Narrow SO Packages
Ordering Information
PART*
MAX700C/D
MAX700CPA
MAX700CSA
MAX700EPA
MAX700ESA
MAX701C/D
MAX701CPA
MAX701CSA
MAX701EPA
MAX701ESA
MAX702C/D
MAX702CPA
MAX702CSA
MAX702EPA
MAX702ESA
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
Dice
8 PDIP
In addition to the features of the MAX701 and MAX702,
the MAX700 provides preset or adjustable voltage
detection so thresholds other than 4.65V can be select-
ed, and adjustable hysteresis. All parts are supplied in
8-pin PDIP and Narrow SO packages in commercial
and extended temperature ranges.
8 Narrow SO
8 PDIP
8 Narrow SO
Dice
8 PDIP
Applications
8 Narrow SO
8 PDIP
Computers
8 Narrow SO
Dice
Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
8 PDIP
8 Narrow SO
8 PDIP
8 Narrow SO
*Devices in PDIP and SO packages are available in both lead-
ed and lead-free packaging. Specify lead free by adding the +
symbol at the end of the part number when ordering.
Pin Configurations
TOP VIEW
MR
SENSE
HYST
GND
1
2
3
4
8
7
6
5
V
MR
N.C.
N.C.
GND
1
2
3
4
8
7
6
5
V
MR
1
2
3
4
8
7
6
5
N.C.
CC
CC
CTL
N.C.
V
RESET
N.C.
CC
GND
N.C.
MAX700
MAX701
MAX702
RESET
RESET
RESET
RESET
N.C.
DIP/SO
DIP/SO
DIP/SO
________________________________________________________________ Maxim Integrated Products
1
For pricing delivery, and ordering information please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Power-Supply Monitor with Reset
ABSOLUTE MAXIMUM RATINGS
CC
V
......................................................................-0.3V to +15.5V
Rate of Rise, V
............................................................100V/µs
CC
Voltage (with respect to GND) at RESET, RESET,
HYST, CTL, SENSE ............................................-0.3V to V
Operating Temperature Range
Power Dissipation, Any Package .....................................380mW
Storage Temperature Range.............................-55°C to +150°C
Lead Temperature (soldering, 10s)..................................+300°C
CC
C Suffix .............................................................0°C to +70°C
E Suffix...........................................................-40°C to +85°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
= +5V, CTL = GND on MAX700, T = +25°C, unless otherwise noted.)
A
CC
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Monitor Voltage Range
CC
T
T
= T
= T
to T
to T
, CTL = V
3
15
V
A
MIN
MAX
CC
(MAX700 Only)
Min V for Valid Reset Output,
Declining Supply
CC
, RESET ≤ 0.4V when sinking 1mA
MAX
1.5
1
V
µA
V
A
MIN
Supply Current
100
4.65
4.62
30
200
4.75
4.75
Power-up
4.50
4.50
Reset Threshold
T
= T
to T
A
MIN
MAX
Power-down
1/MAX702
Internal Hysteresis
Reset Output Pulse Width
RESET Fall Time
HYST not connected
mV
ms
ns
200
100
350
200
10
500
1
MAX700/MAX701 only, C
= 100pF
LOAD
No reset
Reset
V
Pulse Duration Guaranteeing 5V to 4V V
pulse
CC
µs
CC
10
MR Input Threshold
MR Pullup Current
MAX700
0.7
-5
V
-30
µA
I
I
= 3.2mA, V
= 1.6mA, V
= 5V
= 3V
0.4
0.4
SINK
CC
CC
RESET Output Low
V
V
SINK
V
0.4
-
CC
I
I
I
= 3.2mA, V
= 1.6mA, V
= 0.5mA, V
= 4.25V
SOURCE
SOURCE
SOURCE
CC
CC
CC
V
0.4
-
-
CC
RESET Output High
= 3V
V
0.4
CC
= 1.5V
I
I
I
= 16mA, V
= 4.25V
= 3V
0.4
0.4
0.4
SINK
SINK
SINK
CC
RESET Output Low
RESET Output High
= 1.6mA, V
V
V
CC
CC
= 0.4mA, V
= 1.5V
V
0.4
-
-
CC
I
= 3.2mA, V
= 1.6mA, V
= 5V
= 3V
SOURCE
SOURCE
CC
CC
V
0.4
CC
I
2
_______________________________________________________________________________________
Power-Supply Monitor with Reset
1/MAX702
ELECTRICAL CHARACTERISTICS (continued)
(V
= +5V, CTL = GND on MAX700, T = +25°C, unless otherwise noted.)
CC
A
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
MAX701
RESET Output Low
RESET Output High
I
I
= 16mA, V
= 5V
CC
0.4
V
SINK
V
0.4
-
-
-
CC
= 3.2mA, V
= 1.6mA, V
= 4.25V
= 3V
SOURCE
CC
CC
CC
V
0.4
CC
I
I
V
SOURCE
SOURCE
V
0.4
CC
= 0.5mA, V
CC
= 1.5V
I
I
I
= 3.2mA, V
= 4.25V
= 3V
0.4
0.4
0.4
SINK
SINK
SINK
RESET Output Low
= 1.6mA, V
V
V
CC
CC
= 0.4mA, V
= 1.5V
V
0.4
-
CC
RESET Output High
I
= 3.2mA, V
= 5V
CC
SOURCE
MAX702
I
I
I
= 3.2mA, V
= 4.25V
= 3V
0.4
0.4
0.4
SINK
SINK
SINK
CC
RESET Output Low
RESET Output High
V
V
= 1.6mA, V
CC
CC
= 0.4mA, V
= 1.5V
V
0.4
-
CC
I
= 3.2mA, V
= 5V
CC
SOURCE
MAX700 ONLY (CTL = V , unless otherwise noted)
CC
SENSE Input Threshold
SENSE Input Current
HYST Input On-Resistance
CTL Input Threshold
T
= T
to T
MAX
1.25
1.29
0.1
0.5
2
1.35
100
V
A
MIN
nA
kΩ
V
CTL Pulldown Current
30
µA
_______________________________________________________________________________________
3
Power-Supply Monitor with Reset
Pin Description
PIN
NAME
FUNCTION
MAX700 MAX701 MAX702
Input for Manual Pushbutton Reset. Has internal 5µA pullup. Low input activates the
RESET/RESET outputs.
1
1
1
MR
The voltage-sense input when CTL = V . Its threshold is 1.29V. SENSE always
CC
2
—
—
SENSE remains connected to the internal comparator. So, when V
is being monitored
CC
internally (CTL = GND), SENSE should be left open circuit.
Normally NOT used when voltage is monitored through V
(CTL = GND). When
CC
monitoring through SENSE (CTL = V ), HYST allows hysteresis to be added,
CC
reducing noise and spurious reset activity (Figure 3). HYST turns on 5µs before the
3
—
—
HYST
RESET/RESET outputs are activated, and its on-resistance to GND is typically 1kΩ.
4
5
6
7
4
6
3
7
GND
RESET
RESET
CTL
Ground
Goes low when V
when SENSE falls below 1.29V.
falls below 4.65V, or when CTL = V
on the MAX700 goes low
CC
CC
5
—
—
Inverted Version of RESET
When CTL = GND, V is monitored by the reset circuit. When CTL = V , V is ignored
and SENSE is monitored, allowing the threshold to be set with external resistors.
CC
CC CC
—
8
8
2
V
Chip Power and +5V Sensing Input (When CTL = GND on MAX700)
No Connection
CC
—
2, 3, 7
4, 5, 6, 8
N.C.
1/MAX702
4
_______________________________________________________________________________________
Power-Supply Monitor with Reset
1/MAX702
1MΩ
1
2
8
MR
V
CC
MANUAL
RESET
7
BUTTON
CTL
COMPARATOR
1
2
3
4
8
7
6
5
MAX700
MR
+5V
V
CC
150kΩ
SENSE
SENSE
HYST
GND
N.C.
CTL
RESET
RESET
MAX700
N.C.
1.29V REF
R
R
RC
6
5
TO µP
RESET
RESET
OSC
3
4
HYST
GND
Figure 2. MAX700 Typical Connection Diagram
Figure 1. MAX700 Block Diagram
MANUAL
RESET
BUTTON
1
8
MAX700
MR
V
IN
3V TO 15V
V
CC
R1
2
7
2V/div
SENSE
V
CTL
IN
RESET
R2
R3
3
4
6
5
HYST
GND
RESET
RESET
N.C.
0V
0V
TO µP
2V/div
V
CC
V
L
R1 = R2
- 1 V = LOWER VOLTAGE THRESHOLD
L
( )
1.29
V R1
T
R3 =
V
= UPPER VOLTAGE THRESHOLD
U
V
- V
L
U
1s/div
HYSTERESIS = V - V
U
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/
Package Information
MAX701/MAX702 in the correct state for V
voltages
CC
For the latest package outline information, go to
www.maxim-ic.com/packages.
down to 0V. Note the effect of the built-in hysteresis on
the trigger lever of RESET.
_______________________________________________________________________________________
5
Power-Supply Monitor with Reset
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
1
2
3/90
11/05
12/07
Initial release
—
1
Added lead-free information to the Ordering Information table.
Updated Pin Description table.
4
1/MAX702
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2008 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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