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ADM690AANZ

Microprocessor Supervisory Circuits

Analog Devices 

a

Microprocessor

Supervisory Circuits

ADM690A/ADM692A/ADM802L/M/ADM805L/M

FEATURES

Precision Supply Voltage Monitor

4.65 V ADM690A/ADM802L/ADM805L

4.40 V ADM692A/ADM802M/ADM805M

Reset Assertion Down to 1 V VCC

Reset Timeout—200 ms

Watchdog Timer—1.6 s

100 ␮A Quiescent Supply Current

Automatic Battery Backup Power Switching

Voltage Monitor for Power Fail

؎2% Power Fail Accuracy on ADM802L/M

Space-Saving MicroSOIC Package (ADM690A)

APPLICATIONS

Microprocessor Systems

Computers

Controllers

Intelligent Instruments

FUNCTIONAL BLOCK DIAGRAM

VBATT

VCC

BATTERY

SWITCHOVER

VOUT

4.65V*

RESET

GENERATOR

RESET

(RESET)

WATCHDOG

INPUT (WDI)

POWER FAIL

INPUT (PFI)

WATCHDOG

TRANSITION DETECTOR

(1.6s)

1.25V

ADM690A

ADM692A

ADM802L

ADM802M

ADM805L

ADM805M

POWER FAIL

OUTPUT (PFO)

*4.4V FOR ADM692A/ADM802M/ADM805M

( ) = ADM805L/M ONLY

GENERAL DESCRIPTION

The ADM690A/ADM692A/ADM802L/M/ADM805L/M

family of supervisory circuits offers complete single chip

solutions for power supply monitoring and battery control

functions in microprocessor systems. These functions include

µP reset, backup battery switchover, watchdog timer, and power

failure warning.

The ADM690A/ADM692A/ADM802L/M/ADM805L/M are

available in 8-pin packages and provide:

1. Power-on reset output during power-up, power-down and

brownout conditions. The RESET output remains opera-

tional with VCC as low as 1 V.

2. Battery backup switching for CMOS RAM, CMOS

microprocessor or other low power devices.

3. A reset pulse if the optional watchdog timer has not been

toggled within 1.6 seconds.

4. A 1.25 V threshold detector for power fail warning, low battery

detection, or to monitor a power supply other than +5 V.

On the ADM690A/ADM802L/ADM805L the reset voltage

threshold is 4.65 V. On the ADM692A/ADM802M/

ADM805M, the reset voltage threshold is 4.40 V.

The ADM802L/ADM802M guarantee power fail accuracies to

± 2%.

The ADM805L/M provides an active high reset output, RESET

instead of RESET.

The family of products is fabricated using an advanced epitaxial

CMOS process combining low power consumption and high

reliability. RESET assertion is guaranteed with VCC as low as 1 V.

They provide a pin-compatible upgrade for the MAX690A/

MAX692A/MAX802L/MAX802M/MAX805L

All parts are available in 8-pin DIP and SOIC packages. The

ADM690A is also available in a new space-saving microSOIC

package.

REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700 World Wide Web Site: http://www.analog.com

Fax: 617/326-8703

© Analog Devices, Inc., 1996

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