MAX805LCSA+ Maxim Integrated Products, MAX805LCSA+ Datasheet

IC SUPERVISOR MPU 8-SOIC

MAX805LCSA+

Manufacturer Part Number
MAX805LCSA+
Description
IC SUPERVISOR MPU 8-SOIC
Manufacturer
Maxim Integrated Products
Type
Battery Backup Circuitr
Datasheet
1.MAX690ACPA.pdf (12 pages)

Specifications of MAX805LCSA+

Number Of Voltages Monitored
1
Output
Push-Pull, Totem Pole
Reset
Active High
Reset Timeout
140 ms Minimum
Voltage - Threshold
4.65V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Monitored Voltage
4.65 V
Undervoltage Threshold
4.5 V
Overvoltage Threshold
4.75 V
Output Type
Active High, Push-Pull
Manual Reset
Not Resettable
Watchdog
Watchdog
Battery Backup Switching
Backup
Power-up Reset Delay (typ)
280 ms
Supply Voltage (max)
5.5 V
Supply Voltage (min)
1.1 V
Maximum Power Dissipation
471 mW
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
0 C
Power Fail Detection
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
19-4333; Rev 4; 12/05
The MAX690A/MAX692A/MAX802L/MAX802M/MAX805L
reduce the complexity and number of components
required for power-supply monitoring and battery-control
functions in microprocessor (µP) systems. They signifi-
cantly improve system reliability and accuracy compared
to separate ICs or discrete components.
These parts provide four functions:
1) A reset output during power-up, power-down, and
2) Battery-backup switching for CMOS RAM, CMOS
3) A reset pulse if the optional watchdog timer has not
4) A 1.25V threshold detector for power-fail warning or
The parts differ in their reset-voltage threshold levels
and reset outputs. The MAX690A/MAX802L/MAX805L
generate a reset pulse when the supply voltage drops
below 4.65V, and the MAX692A/MAX802M generate a
reset below 4.40V. The MAX802L/MAX802M guaran-
tee power-fail accuracies to ±2%. The MAX805L is the
same as the MAX690A except that RESET is provided
instead of RESET.
All parts are available in 8-pin DIP and SO packages.
The MAX690A/MAX802L are pin compatible with the
MAX690 and MAX694. The MAX692A/MAX802M are
pin compatible with the MAX692.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
__________________General Description
__________Typical Operating Circuit
_______________________Applications
UNREGULATED DC REGULATED +5V
brownout conditions.
µP, or other low-power logic.
been toggled within 1.6sec.
low-battery detection, or to monitor a power supply
other than +5V.
R
R
1
2
Battery-Powered Computers and Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
BATTERY
LITHIUM
O.1µF
3.6V
MAX690A
MAX802L
________________________________________________________________ Maxim Integrated Products
PFI
V
V
BATT
CC
GND
RESET
V
PFO
WDI
OUT
Microprocessor Supervisory Circuits
V
NMI
I/O LINE GND
V
RESET
CC
CC
CMOS
RAM
µP
GND
♦ Precision Supply-Voltage Monitor:
♦ Reset Time Delay – 200ms
♦ Watchdog Timer – 1.6sec Timeout
♦ Battery-Backup Power Switching
♦ 200µA Quiescent Supply Current
♦ 50nA Quiescent Supply Current in Battery-
♦ Voltage Monitor for Power-Fail or Low-Battery
♦ Power-Fail Accuracy Guaranteed to ±2%
♦ Guaranteed R R E E S S E E T T Assertion to V
♦ 8-Pin SO and DIP Packages
Ordering Information continued on last page.
* Dice are specified at T
**Contact factory for availability and processing to MIL-STD-883.
Devices in PDIP and SO packages are available in both leaded
and lead-free packaging. Specify lead free by adding the +
symbol at the end of the part number when ordering. Lead free
not available for CERDIP package.
_________________Pin Configurations
______________Ordering Information
MAX690ACPA
MAX690ACSA
MAX690AC/D
MAX690AEPA
MAX690AESA
MAX690AMJA
___________________________Features
TOP VIEW
4.65V for MAX690A/MAX802L/MAX805L
4.40V for MAX692A/MAX802M
Backup Mode
Warning
(MAX802L/M)
( ) ARE FOR MAX805L ONLY.
PART
V
GND
V
OUT
PFI
CC
1
2
3
4
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
TEMP. RANGE
A
0°C to +70°C
0°C to +70°C
0°C to +70°C
= +25°C
MAX802M
MAX690A
MAX692A
MAX802L
MAX805L
DIP/SO
8
7
6
5
V
RESET (RESET)
WDI
PFO
BATT
CC
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 CERDIP**
Dice*
PIN-PACKAGE
= 1V
1

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MAX805LCSA+ Summary of contents

Page 1

... LITHIUM V OUT GND BATTERY MAX690A MAX802L ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. ___________________________Features ♦ Precision Supply-Voltage Monitor: 4.65V for MAX690A/MAX802L/MAX805L 4.40V for MAX692A/MAX802M ♦ Reset Time Delay – 200ms ♦ ...

Page 2

Microprocessor Supervisory Circuits ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND ...

Page 3

Microprocessor Supervisory Circuits ELECTRICAL CHARACTERISTICS (continued 4.75V to 5.5V for MAX690A/MAX802L/MAX805L unless otherwise noted.) A MIN MAX PARAMETER RESET Output Voltage Watchdog Timeout WDI Pulse Width WDI Input Threshold (Note ...

Page 4

Microprocessor Supervisory Circuits __________________________________________Typical Operating Characteristics OUTPUT VOLTAGE vs. LOAD CURRENT 5. + +2.8V BATT 4. +25°C A 4.90 4.85 SLOPE = 5Ω 4.80 4. (mA) ...

Page 5

Microprocessor Supervisory Circuits ______________________________________________________________Pin Description PIN MAX690A/MAX692A MAX805L MAX802L/MAX802M – _______________________________________________________________________________________ NAME Supply Output for CMOS RAM. When V V connects to V through ...

Page 6

Microprocessor Supervisory Circuits V BATT BATTERY-SWITCHOVER CIRCUITRY V CC 3.5V 1.25V WATCHDOG WDI TIMER MAX690A MAX692A 0.8V MAX802L MAX802M PFI MAX805L 1.25V GND ( ) ARE FOR MAX805L ONLY. Figure 1. Block Diagram _______________Detailed Description A microprocessor’s (µP’s) reset input ...

Page 7

Microprocessor Supervisory Circuits V BATT SW1 SW2 D1 D2 SUBSTRATE MAX690A MAX805L MAX802L D3 MAX692A MAX802M V OUT CONDITION SW1/SW2 V > Reset Threshold Open CC V < Reset Threshold and CC Open V > BATT V < ...

Page 8

Microprocessor Supervisory Circuits + OUT CC MAX692A MAX802M RESET V BATT + 100k 0.1F GND Figure 5. Using a SuperCap™ Backup Power Source with the MAX692A/MAX802M and a +5V ±10% Supply When V connects to V ...

Page 9

Microprocessor Supervisory Circuits no additional circuitry (see the Typical Operating Circuit). However, batteries with open-circuit voltages that are greater cannot be used for backup, as current is sourced into the substrate through the diode (D1 in Figure 3) when V ...

Page 10

Microprocessor Supervisory Circuits BUFFERED RESET TO OTHER SYSTEM COMPONENTS V CC MAX690A 4.7k MAX692A RESET MAX802L MAX802M GND Figure 8. Interfacing to µPs with Bidirectional Reset I/O 10 ______________________________________________________________________________________ V CC RESET GND ...

Page 11

Microprocessor Supervisory Circuits ________________________ Minimum Nominal Nominal Reset Reset Pulse Part Threshold Width Number (V) (ms) MAX690A/692A 4.65/4.40 140 MAX691A/693A 4.65/4.40 140/adj. MAX696 Adj. 35/adj. MAX697 Adj. 35/adj. MAX700 4.65/adj. 200 MAX703/704 4.65/4.40 140 MAX705/706 4.65/4.40 140 MAX706P 2.63 140 ...

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 © 2005 Maxim Integrated Products ____________________Chip Topography ...

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