MAX690AMJA-883B Maxim Integrated Products, Inc., MAX690AMJA-883B Datasheet

MAX690AMJA-883B

Manufacturer Part Number

MAX690AMJA-883B

Description

Max690a, Max692a, Max802l, Max802m, Max805l Microprocessor Supervisory Circuits

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.MAX690AMJA-883B.pdf (12 pages)

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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.

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

BATT

GND

RESET

PFO

WDI

OUT

Microprocessor Supervisory Circuits

NMI

I/O LINE GND

RESET

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

GND

OUT

PFI

-40°C to +85°C

-55°C to +125°C

TEMP. RANGE

0°C to +70°C

= +25°C

MAX802M

MAX690A

MAX692A

MAX802L

MAX805L

DIP/SO

RESET (RESET)

WDI

PFO

BATT

8 Plastic DIP

8 SO

8 Plastic DIP

8 SO

8 CERDIP**

Dice*

PIN-PACKAGE

= 1V

Related parts for MAX690AMJA-883B

MAX690AMJA-883B Summary of contents

Page 1

... PART MAX690ACPA MAX690ACSA MAX690AC/D MAX690AEPA MAX690AESA MAX690AMJA 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 ...

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

... Plastic DIP ARE FOR MAX805L ONLY. 8 Plastic DIP TRANSISTOR COUNT: 573; SUBSTRATE MUST BE LEFT UNCONNECTED Dice* 8 Plastic DIP CERDIP** Printed USA is a registered trademark of Maxim Integrated Products, Inc OUT BATT RESET (RESET) 0.061" WDI (1.55mm) PFI PFO 0.078" ...

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