MAX692ACSA Maxim Integrated Products, MAX692ACSA Datasheet

IC MPU SUPERVISORY CIRCUIT 8SOIC

MAX692ACSA

Manufacturer Part Number
MAX692ACSA
Description
IC MPU SUPERVISORY CIRCUIT 8SOIC
Manufacturer
Maxim Integrated Products
Type
Battery Backup Circuitr
Datasheet
1.MAX690ACPA.pdf (12 pages)

Specifications of MAX692ACSA

Number Of Voltages Monitored
1
Output
Push-Pull, Totem Pole
Reset
Active Low
Reset Timeout
140 ms Minimum
Voltage - Threshold
4.4V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

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Part Number:
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Quantity:
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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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MAX692ACSA 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

... Microprocessor Supervisory Circuits __Ordering Information (continued) PART TEMP. RANGE MAX692ACPA 0°C to +70°C MAX692ACSA 0°C to +70°C MAX692AC/D 0°C to +70°C MAX692AEPA -40°C to +85°C MAX692AESA -40°C to +85°C MAX692AMJA -55°C to +125°C MAX802LCPA 0°C to +70°C MAX802LCSA 0°C to +70°C MAX802LEPA -40° ...

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