MAX813LMJA Maxim Integrated Products, MAX813LMJA Datasheet

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MAX813LMJA

Manufacturer Part Number
MAX813LMJA
Description
Low-cost, microprocessor supervisory circuit. Active-low manual-reset input. Active-high reset output. Precision supply-voltage monitor 4.65V.
Manufacturer
Maxim Integrated Products
Datasheet

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19-4334; Rev. 5; 9/95
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
2) An independent watchdog output that goes low if
3) A 1.25V threshold detector for power-fail warning,
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.
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
_______________General Description
_______________________Applications
brownout conditions.
the watchdog input has not been toggled within 1.6
seconds.
low-battery detection, or for monitoring a power sup-
ply other than +5V.
UNREGULATED DC
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
PUSHBUTTON
SWITCH
+5V DC LINEAR
________________________________________________________________ Maxim Integrated Products
REGULATOR
MAX667
V
PFI
MR
CC
MAX813L
MAX705
MAX706
RESET
Low-Cost, µP Supervisory Circuits
WDO
PFO
PFI
RESET
I/O LINE
INTERRUPT
V
NMI
CC
P
Ordering Information continued at end of data sheet.
* Dice are specified at T
**Contact factory for availability and processing to MIL-STD-883.
_________________Pin Configurations
______________Ordering Information
MAX705CPA
MAX705CSA
MAX705CUA
MAX705C/D
___________________________Features
( ) ARE FOR MAX813L ONLY.
Pin Configurations continued at end of data sheet.
µMAX Package: Smallest 8-Pin SO
Guaranteed RESET Valid at V
Precision Supply-Voltage Monitor
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
TOP VIEW
PART
4.65V in MAX705/MAX707/MAX813L
4.40V in MAX706/MAX708
GND
GND
V
V
MR
PFI
MR
PFI
CC
CC
1
2
3
4
1
2
3
4
TEMP. RANGE
A
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
= +25°C.
MAX813L
MAX705
MAX706
DIP/SO
MAX707
MAX708
DIP/SO
CC
8
7
6
5
8
7
6
5
= 1V
WDO
RESET (RESET)
WDI
PFO
8 Plastic DIP
8 SO
8 µMAX
Dice*
RESET
RESET
N.C.
PFO
PIN-PACKAGE
1

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MAX813LMJA Summary of contents

Page 1

... RESET CC PFI MAX705 MAX706 MR MAX813L PUSHBUTTON SWITCH ________________________________________________________________ Maxim Integrated Products Call toll free 1-800-998-8800 for free samples or literature. ___________________________Features µMAX Package: Smallest 8-Pin SO Guaranteed RESET Valid at V 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— ...

Page 2

Low-Cost, µP Supervisory Circuits ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND ...

Page 3

Low-Cost, µP Supervisory Circuits ELECTRICAL CHARACTERISTICS (continued 4.75V to 5.5V for MAX705/MAX707/MAX813L PARAMETER MR Pull-Up Current MR Pulse Width Low MR Input Threshold High MR to Reset Out Delay (Note 2) PFI Input Threshold PFI Input ...

Page 4

Low-Cost, µP Supervisory Circuits __________________________________________Typical Operating Characteristics MAX705/MAX707 RESET OUTPUT VOLTAGE vs. SUPPLY VOLTAGE + +25° + RESET RESET RESET 330pF GND 0V 500ms/div POWER-FAIL COMPARATOR ASSERTION RESPONSE TIME ...

Page 5

Low-Cost, µP Supervisory Circuits ______________________________________________________________Pin Description PIN MAX705/MAX706 MAX707/MAX708 DIP/SO µMAX DIP/SO µMAX ...

Page 6

Low-Cost, µP Supervisory Circuits WATCHDOG 6 WATCHDOG WDI TRANSITION TIMER DETECTOR V CC TIMEBASE FOR RESET AND 250 A WATCHDOG 1 MR RESET 2 GENERATOR V CC MAX705 4.65V* MAX706 4 MAX813L PFI 1.25V 3 GND * 4.40V FOR MAX7O6. ...

Page 7

Low-Cost, µP Supervisory Circuits Power-Fail Comparator The power-fail comparator can be used for various pur- poses because its output and noninverting input are not internally connected. The inverting input is internal- ly connected to a 1.25V reference ...

Page 8

Low-Cost, µP Supervisory Circuits MAX70_ RESET Figure 5. RESET Valid to Ground Circuit + MAX70_ PFO PFI R2 RESET GND V- + +5V PFO TRIP 5 1.25 1.25 V TRIP , ...

Page 9

... MAX813LCUA 0°C to +70°C MAX813LC/D 0°C to +70°C MAX813LEPA -40°C to +85°C MAX813LESA -40°C to +85°C MAX813LMJA -55°C to +125°C * Dice are specified +25 °C. A **Contact factory for availability and processing to MIL-STD-883. _______________________________________________________________________________________ _______Pin Configuration (continued) PIN-PACKAGE TOP VIEW ...

Page 10

Low-Cost, µP Supervisory Circuits _______________________________________________________Package Information ______________________________________________________________________________________ C 0.101mm 0.004 in L 8-PIN MAX MICROMAX SMALL-OUTLINE PACKAGE INCHES MILLIMETERS DIM MIN MAX MIN MAX A 0.036 0.044 0.91 1.11 A1 0.004 0.008 ...

Page 11

Low-Cost, µP Supervisory Circuits ($) 1000-up Price † Pins (typ) max µA Mode Backup SUPPLY I (typ) max mA Mode Operating SUPPLY I Output Battery-On Output Low-Line Input Manual-Reset Comparator Power-Fail Protect Write E C – — – (Ω) Max ...

Page 12

... 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. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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