MAX805LESA Maxim, MAX805LESA Datasheet

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MAX805LESA

Manufacturer Part Number
MAX805LESA
Description
Microprocessor Supervisory Circuits
Manufacturer
Maxim
Datasheet
1.MAX805LESA.pdf (12 pages)

Available stocks

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Part Number
Manufacturer
Quantity
Price
Company:
Meier Automation Equipment Co., Limited Meier Automation Equipment Co., Limited
Part Number:
MAX805LESA+T
Manufacturer:
MAXIM/美信
Quantity:
20 000
19-4333; Rev 3; 9/93
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.
__________________General Description
Call toll free 1-800-998-8800 for free samples or literature.
__________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.1 F
3.6V
MAX690A
MAX802L
________________________________________________________________ Maxim Integrated Products
PFI
V
V
BATT
CC
GND
RESET
V
PFO
WDI
OUT
Microprocessor Supervisory Circuits
V
V
RESET
NMI
I/O LINE GND
CC
CC
CMOS
RAM
P
GND
Ordering Information continued on last page.
* Dice are specified at T
**Contact factory for availability and processing to MIL-STD-883.
_________________Pin Configurations
______________Ordering Information
MAX690ACPA
MAX690ACSA
MAX690AC/D
MAX690AEPA
MAX690AESA
MAX690AMJA
___________________________Features
TOP VIEW
Precision Supply-Voltage Monitor:
4.65V for MAX690A/MAX802L/MAX805L
4.40V for MAX692A/MAX802M
Reset Time Delay – 200ms
Watchdog Timer – 1.6sec Timeout
Battery-Backup Power Switching
200µA Quiescent Supply Current
50nA Quiescent Supply Current in Battery-
Backup Mode
Voltage Monitor for Power-Fail or Low-Battery
Warning
Power-Fail Accuracy Guaranteed to ±2%
(MAX802L/M)
Guaranteed
8-Pin SO and DIP Packages
( ) ARE FOR MAX805L ONLY.
PART
V
GND
V
OUT
PFI
CC
RESET
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
Assertion to V
8
7
6
5
V
RESET (RESET)
WDI
PFO
CC
BATT
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 CERDIP**
Dice*
PIN-PACKAGE
= 1V
1

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MAX805LESA Summary of contents

Page 1

... OUT GND BATTERY V CC CMOS MAX690A MAX802L ________________________________________________________________ Maxim Integrated Products Call toll free 1-800-998-8800 for free samples or literature. ___________________________Features Precision Supply-Voltage Monitor: 4.65V for MAX690A/MAX802L/MAX805L 4.40V for MAX692A/MAX802M Reset Time Delay – 200ms Watchdog Timer – 1.6sec Timeout Battery-Backup Power Switching 200µ ...

Page 2

Microprocessor Supervisory Circuits 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 SYMBOL RESET Output Voltage t Watchdog Timeout WD t WDI Pulse Width ...

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 = 5 4.80 4. (mA) ...

Page 5

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

Page 6

Microprocessor Supervisory Circuits V BATT BATTERY-SWITCHOVER CIRCUITRY V CC GENERATOR 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 ...

Page 7

Microprocessor Supervisory Circuits V BATT SW1 SW2 SW3 D1 D2 SUBSTRATE MAX690A MAX802L MAX805L D3 MAX692A MAX802M V OUT CONDITION SW1/SW2 SW3/SW4 V > Reset Threshold Open CC V < Reset Threshold and CC Open V > BATT ...

Page 8

... Use the SuperCap circuit of Figure 5 with a MAX692A or MAX802M and a ±10% supply. This circuit ensures that the SuperCap only charges to V 0.5V. At the maximum V of 5.5V, the SuperCap CC charges up to 5.0V, only 0.5V above the maximum reset threshold—well within the requisite 0.6V. ™SuperCap is a trademark of Baknor Industries. 8 _______________________________________________________________________________________ V ...

Page 9

Microprocessor Supervisory Circuits connected directly to the V BATT MAX690A/MAX692A/MAX802L/MAX802M/MAX805L with 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 ...

Page 10

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

Page 11

Microprocessor Supervisory Circuits ________________________ Minimum Nominal Nominal Reset Watchdog Reset Pulse Timeout Part Threshold Width Period Number (V) (ms) (sec) MAX690A/692A 4.65/4.40 140 1.6 MAX691A/693A 4.65/4.40 140/adj. 1.6/adj. MAX696 Adj. 35/adj. 1.6/adj. MAX697 Adj. 35/adj. 1.6/adj. MAX700 4.65/adj. 200 - ...

Page 12

... MAX805LCPA 0°C to +70°C MAX805LCSA 0°C to +70°C MAX805LC/D 0°C to +70°C MAX805LEPA -40°C to +85°C MAX805LESA -40°C to +85°C MAX805LMJA -55°C to +125°C * Dice are specified +25°C. A **Contact factory for availability and processing to MIL-STD-883. Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied ...

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