ADM823SYKSR7 Analog Devices, ADM823SYKSR7 Datasheet

ADM823SYKSR7

Manufacturer Part Number

ADM823SYKSR7

Description

SC70-5

Manufacturer

Analog Devices

Datasheet

1.ADM823RYRJZ-R7.pdf (12 pages)

Specifications of ADM823SYKSR7

Date_code

07+

Current page: 1 of 12
Download datasheet (442Kb)

FEATURES

Precision 2.5 V to 5 V power supply monitor

7 reset threshold options: 2.19 V to 4.63 V

140 ms (min) reset timeout

Watchdog timer with 1.6s timeout (ADM823, ADM824)

Manual reset input (ADM823, ADM825)

Push-pull output stages:

Low power consumption (5 µA)

Guaranteed reset output valid to V

Power supply glitch immunity

Specified over automotive temperature range

5-lead SC70 and SOT-23 packages

APPLICATIONS

Microprocessor systems

Computers

Controllers

Intelligent instruments

Portable equipment

GENERAL DESCRIPTION

The ADM823/ADM824/ADM825 are supervisory circuits

which monitor power supply voltage levels and code execution

integrity in microprocessor-based systems. As well as providing

power on reset signals, an on-chip watchdog timer can reset the

microprocessor if it fails to strobe within a preset timeout

period. A reset signal can also be asserted by an external push-

button, through a manual reset input. The three parts feature

different combinations of watchdog input, manual reset input

and output stage configuration, as shown in Table 1.

Table 1. Selection Table

Part No.

ADM823

ADM824

ADM825

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 that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

RESET (ADM823)

RESET, RESET (ADM824/ADM825)

Watchdog Timer

Yes

–

= 1 V

Manual Reset in 5-Lead SC70 and SOT-23

Supervisory Circuits with Watchdog and

Manual Reset

Yes

–

Yes

Each part is available in a choice of seven reset threshold

options ranging from 2.19 V to 4.63 V. The reset and watchdog

timeout periods are fixed at 140 ms (min) and 1.6s (typ),

respectively.

The ADM823/ADM824/ADM825 are available in 5-lead SC70

and SOT-23 packages and typically consume only 3 µA, making

them suitable for use in low power portable applications.

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

Tel: 781.329.4700

Fax: 781.326.8703

REF

ADM823

DEBOUNCE

ADM823/ADM824/ADM825

FUNCTIONAL BLOCK DIAGRAM

GND

RESET

Push-Pull

GENERATOR

RESET

WATCHDOG

Figure 1.

DETECTOR

WDI

Output Stage

RESET

–

Push-Pull

www.analog.com

RESET

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