MAX813LCSA 반도체 회로 부품 판매점
Low-Cost / uP Supervisory Circuits
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 Maxim Integrated |
19-4334; Rev. 5; 9/95
Low-Cost, µP Supervisory Circuits
_______________General Description
The MAX705-MAX708/MAX813L microprocessor (µP)
supervisory circuits reduce the complexity and number
of components required to monitor power-supply and
battery functions in µP systems. These devices signifi-
cantly improve system reliability and accuracy com-
pared to separate ICs or discrete components.
The MAX705/MAX706/MAX813L provide four functions:
1) A reset output during power-up, power-down, and
brownout conditions.
2) An independent watchdog output that goes low if
the watchdog input has not been toggled within 1.6
seconds.
3) A 1.25V threshold detector for power-fail warning,
low-battery detection, or for monitoring a power sup-
ply other than +5V.
4) An active-low manual-reset input.
The MAX707/MAX708 are the same as the MAX705/
MAX706, except an active-high reset is substituted for
the watchdog timer. The MAX813L is the same as the
MAX705, except RESET is provided instead of RESET.
Two supply-voltage monitor levels are available: The
MAX705/MAX707/MAX813L generate a reset pulse when
the supply voltage drops below 4.65V, while the
MAX706/MAX708 generate a reset pulse below 4.40V.
All four parts are available in 8-pin DIP, SO and µMAX
packages.
_______________________Applications
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
__________Typical Operating Circuit
UNREGULATED DC
MAX667
+5V DC LINEAR
REGULATOR
PUSHBUTTON
SWITCH
VCC RESET
PFI PFI
MAX705 WDO
MR
MAX706
MAX813L
PFO
µP
VCC
RESET
I/O LINE
NMI
INTERRUPT
___________________________Features
o µMAX Package: Smallest 8-Pin SO
o Guaranteed RESET Valid at VCC = 1V
o Precision Supply-Voltage Monitor
4.65V in MAX705/MAX707/MAX813L
4.40V in MAX706/MAX708
o 200ms Reset Pulse Width
o Debounced TTL/CMOS-Compatible
Manual-Reset Input
o Independent Watchdog Timer—1.6sec Timeout
(MAX705/MAX706)
o Active-High Reset Output
(MAX707/MAX708/MAX813L)
o Voltage Monitor for Power-Fail or Low-Battery
Warning
______________Ordering Information
PART
MAX705CPA
MAX705CSA
MAX705CUA
MAX705C/D
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
8 µMAX
Dice*
Ordering Information continued at end of data sheet.
* Dice are specified at TA = +25°C.
**Contact factory for availability and processing to MIL-STD-883.
_________________Pin Configurations
TOP VIEW
MR 1
VCC 2
GND 3
PFI 4
MAX705
MAX706
MAX813L
8 WDO
7 RESET (RESET)
6 WDI
5 PFO
DIP/SO
MR 1
VCC 2
GND 3
PFI 4
MAX707
MAX708
8 RESET
7 RESET
6 N.C.
5 PFO
DIP/SO
( ) ARE FOR MAX813L ONLY.
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
Low-Cost, µP Supervisory Circuits
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V
All Other Inputs (Note 1) . . . . . . . . . . . . . . . -0.3V to (VCC + 0.3V)
Input Current
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Output Current (all outputs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Continuous Power Dissipation
Plastic DIP (derate 9.09mW/°C above +70°C) . . . . . . . 727mW
SO (derate 5.88mW/°C above +70°C) . . . . . . . . . . . . . . . 471mW
µMAX (derate 4.10mW/°C above +70°C) . . . . . . . . . . . . 330mW
CERDIP (derate 8.00mW/°C above +70°C) . . . . . . . . . . 640mW
Operating Temperature Ranges
MAX70_C__, MAX813LC__ . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
MAX70_E__, MAX813LE__ . . . . . . . . . . . . . . . . . . . -40°C to +85°C
MAX70_MJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to +125°C
Storage Temperature Range . . . . . . . . . . . . . . . . -65°C to +160°C
Lead Temperature (soldering, 10sec) . . . . . . . . . . . . . . . . +300°C
Note 1: The input voltage limits on PFI and MR can be exceeded if the input current is less than 10mA.
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
(VCC = 4.75V to 5.5V for MAX705/MAX707/MAX813L, VCC = 4.5V to 5.5V for MAX706/MAX708, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Operating Voltage Range
Supply Current
Reset Threshold (Note 2)
Reset Threshold Hysteresis (Note 2)
Reset Pulse Width (Note 2)
RESET Output Voltage
RESET Output Voltage
Watchdog Timeout Period
WDI Pulse Width
WDI Input Threshold
Low
High
WDI Input Current
WDO Output Voltage
VCC
ISUPPLY
VRT
tRS
tWD
tWP
MAX70_C
1.0
MAX813LC
1.1
MAX70_E/M, MAX813LE/M
1.2
MAX705C, MAX706C, MAX813LC
150
MAX705E/M, MAX706E/M, MAX813LE/M
150
MAX707C, MAX708C
50
MAX707E/M, MAX708E/M
50
MAX705, MAX707, MAX813L
4.50 4.65
MAX706, MAX708
4.25 4.40
40
140 200
ISOURCE = 800µA
VCC - 1.5
ISINK = 3.2mA
MAX70_C, VCC = 1V, ISINK = 50µA
MAX70_E/M, VCC = 1.2V, ISINK = 100µA
MAX707, MAX708, ISOURCE = 800µA VCC - 1.5
MAX707, MAX708, ISINK = 1.2mA
MAX813LC, ISOURCE = 4µA, VCC = 1.1V
MAX813LE/M, ISOURCE = 4µA, VCC = 1.2V
0.8
0.9
MAX813L
ISOURCE = 800µA VCC - 1.5
ISINK = 3.2mA
MAX705, MAX706, MAX813L
1.00
1.60
VIL = 0.4V, VIH = (VCC) (0.8)
MAX705, MAX706, MAX813L,
VCC = 5V
MAX705, MAX706, MAX813L, WDI = VCC
MAX705, MAX706, MAX813L, WDI = 0V
50
3.5
-150
50
-50
MAX705, MAX706, MAX813L,
ISOURCE = 800µA
VCC - 1.5
MAX705, MAX706, MAX813L,
ISINK = 1.2mA
5.5
5.5
5.5
350
500
350
500
4.75
4.50
280
0.4
0.3
0.3
0.4
0.4
2.25
0.8
150
0.4
V
µA
V
mV
ms
V
V
sec
ns
V
µA
V
2 _______________________________________________________________________________________
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