Maxim MAX813LMJA, MAX813LESA, MAX813LC-D, MAX813LCPA, MAX813LCSA Datasheet
...
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 significantly improve system reliability and accuracy compared 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 supply 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
___________________________Features
♦ µMAX Package: Smallest 8-Pin SO
♦ Guaranteed RESET Valid at VCC= 1V
♦ Precision Supply-Voltage Monitor
4.65V in MAX705/MAX707/MAX813L
4.40V in MAX706/MAX708
♦ 200ms Reset Pulse Width
♦ Debounced TTL/CMOS-Compatible
Manual-Reset Input
♦ Independent Watchdog Timer—1.6sec Timeout
(MAX705/MAX706)
♦ Active-High Reset Output
(MAX707/MAX708/MAX813L)
♦ Voltage Monitor for Power-Fail or Low-Battery
Warning
______________Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX705CPA
MAX705CSA 0°C to +70°C 8 SO
MAX705CUA 0°C to +70°C 8 µMAX
MAX705C/D 0°C to +70°C Dice*
Ordering Information continued at end of data sheet.
* Dice are specified at T
**Contact factory for availability and processing to MIL-STD-883.
0°C to +70°C
= +25°C.
A
8 Plastic DIP
_________________Pin Configurations
TOP VIEW
MR
V
GND
PFI
1
2
CC
3
4
MAX705
MAX706
MAX813L
WDO
8
RESET (RESET)
7
WDI
6
5
PFO
MAX705–MAX708/MAX813L
1
2
3
4
DIP/SO
MAX707
MAX708
DIP/SO
Maxim Integrated Products
UNREGULATED DC
PUSHBUTTON
SWITCH
MAX667
+5V DC LINEAR
REGULATOR
µP
V
V
CC
PFI
MAX705
MAX706
MR
MAX813L
________________________________________________________________
RESET
PFI
WDO
PFO
CC
RESET
I/O LINE
NMI
INTERRUPT
( ) ARE FOR MAX813L ONLY.
Pin Configurations continued at end of data sheet.
MR
V
GND
PFI
CC
Call toll free 1-800-998-8800 for free samples or literature.
RESET
8
RESET
7
N.C.
6
5
PFO
1
Low-Cost, µP Supervisory Circuits
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
.............................................. -0.3V to 6.0V
V
CC
All Other Inputs (Note 1) ............... -0.3V to (V
Input Current
...................................................... 20mA
V
CC
GND .................................................... 20mA
CC
+ 0.3V)
Output Current (all outputs) ............................. 20mA
Continuous Power Dissipation
Plastic DIP (derate 9.09mW/°C above +70°C) ....... 727mW
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= T
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX70_C 1.0 5.5
Operating Voltage Range V
Supply Current I
MAX705–MAX708/MAX813L
Reset Threshold (Note 2) V
Reset Threshold Hysteresis (Note 2)
Reset Pulse Width (Note 2) t
RESET Output Voltage
RESET Output Voltage
Watchdog Timeout Period t
WDI Pulse Width t
WDI Input Threshold
Low
High
WDI Input Current
WDO Output Voltage
CC
SUPPLY
RT
RS
WD
WP
MAX70_E/M, MAX813LE/M 1.2 5.5
MAX705C, MAX706C, MAX813LC 150 350
MAX705E/M, MAX706E/M, MAX813LE/M 150 500
MAX707C, MAX708C 50 350
MAX707E/M, MAX708E/M 50 500
MAX705, MAX707, MAX813L 4.50 4.65 4.75
MAX706, MAX708 4.25 4.40 4.50
I
SOURCE
I
= 3.2mA 0.4
SINK
MAX70_C, VCC= 1V, I
MAX70_E/M, VCC= 1.2V, I
MAX707, MAX708, I
MAX707, MAX708, I
MAX813LC, I
MAX813LE/M, I
MAX813L
MAX705, MAX706, MAX813L
VIL= 0.4V, VIH= (VCC) (0.8) 50 ns
MAX705, MAX706, MAX813L,
= 5V
V
CC
MAX705, MAX706, MAX813L, WDI = V
MAX705, MAX706, MAX813L, WDI = 0V -150 -50
MAX705, MAX706, MAX813L,
I
SOURCE
= 800µA
MAX705, MAX706, MAX813L,
= 1.2mA
I
SINK
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
to T
MIN
, unless otherwise noted.)
MAX
40 mV
140 200 280 ms
= 800µA VCC- 1.5
0.3
0.3
0.4
SOURCE
SOURCE
= 50µA
SINK
= 100µA
SINK
SOURCE
SINK
= 800µA
= 1.2mA 0.4
= 4µA, VCC= 1.1V
= 4µA, VCC= 1.2V
I
SOURCE
I
SINK
= 800µA
= 3.2mA
VCC- 1.5
0.8
0.9
VCC- 1.5
1.00 1.60 2.25 sec
0.8
3.5
CC
50 150
VCC- 1.5
0.4
VMAX813LC 1.1 5.5
µA
V
V
V
V
µA
V
2 _______________________________________________________________________________________
Low-Cost, µP Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
(VCC= 4.75V to 5.5V for MAX705/MAX707/MAX813L, VCC= 4.5V to 5.5V for MAX706/MAX708, TA= T
PARAMETER
MR Pull-Up Current MR = 0V 100 250 600 µA
MR Pulse Width t
MR Input Threshold
MR to Reset Out Delay (Note 2) t
PFI Input Threshold VCC= 5V 1.20 1.25 1.30 V
PFI Input Current -25.00 0.01 25.00 nA
PFO Output Voltage
Note 2: Applies to both RESET in the MAX705-MAX708 and RESET in the MAX707/MAX708/MAX813L.
Low
High
SYMBOL CONDITIONS MIN TYP MAX UNITS
MR
MD
I
SOURCE
I
SINK
= 800µA VCC- 1.5
= 3.2mA 0.4
to T
MIN
150 ns
2.0
, unless otherwise noted.)
MAX
0.8
250 ns
MAX705–MAX708/MAX813L
V
V
_______________________________________________________________________________________ 3
Low-Cost, µP Supervisory Circuits
__________________________________________Typical Operating Characteristics
MAX705/MAX707
RESET OUTPUT VOLTAGE
V
RESET
vs. SUPPLY VOLTAGE
+5V
TA = +25°C
CC
0V
V
V
CC
CC
0V
500ms/div
RESET
GND
2k
RESET
330pF
1V/div
+5V
1V/div
+5V
V
+5V
RESET
CC
RESET RESPONSE TIME
V
V
CC
POWER-FAIL COMPARATOR
ASSERTION RESPONSE TIME
+5V
1V/div 50mV/div
0V
+1.20V
+5V
0V
+5V
0V
MAX705–MAX708/MAX813L
PFO
PFI
+1.25V
+1.30V
PFI
+5V
PFO
30pF
VCC = +5V
= +25°C
T
A
1k
RESET, RESET ASSERTION
MAX705/MAX707
CC
10k
RESET
GND
30pF
2µs/div
RESET
MAX707
VCC = VRT
= +25°C
T
A
V
CC
10k
RESET
RESET
GND
330pF
10k
TA = +25°C
330pF
+4V
1V/div
0V
RESET
1V/div
RESET
PFO
+1.20V
+5V
+5V
POWER-FAIL COMPARATOR
DE-ASSERTION RESPONSE TIME
+5V
PFI
+1.25V
0V
PFI
PFO
30pF 1k
400ns/div
MAX707
RESET, RESET DE-ASSERTION
VCC = VRT
= +25°C
T
A
V
CC
RESET
RESET
GND
10k
10k
330pF
0V
0V
VCC = +5V
= +25°C
T
A
+3V
+1.30V
RESET
2V/div
330pF
RESET
400ns/div
RESET
400ns/div
MAX707/MAX708/MAX813L
RESET OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
+5V
TA = +25°C
V
CC
V
0V
0V
CC
RESET
GND
10k
500ms/div
330pF
1V/div
+5V
1V/div
+5V
V
CC
0V
0V
RESET RESPONSE TIME
V
CC
RESET
GND
MAX813L
10k
330pF
2µs/div
400ns/div
+4V
+4V
4 _______________________________________________________________________________________
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