ADM823RYRJZ-R7 データシートの表示（PDF） - Analog Devices

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ADM823RYRJZ-R7

Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23

Analog Devices 

Data Sheet

Supervisory Circuits with Watchdog and

Manual Reset in 5-Lead SC70 and SOT-23

ADM823/ADM824/ADM825

FEATURES

Precision 2.5 V to 5 V power supply monitor

7 reset threshold options: 2.19 V to 4.63 V

140 ms (minimum) reset timeout

Watchdog timer with 1.6 sec timeout (ADM823, ADM824)

Manual reset input (ADM823, ADM825)

Push-pull output stages

RESET (ADM823)

RESET, RESET (ADM824/ADM825)

Low power consumption: 5 µA

Guaranteed reset output valid to VCC = 1 V

Power supply glitch immunity

Specified over automotive temperature range

5-lead SC70 and SOT-23 packages

FUNCTIONAL BLOCK DIAGRAM

ADM823

VCC

VREF

RESET

GENERATOR

VCC

RESET

MR

DEBOUNCE

WATCHDOG

DETECTOR

GND

WDI

Figure 1.

APPLICATIONS

Microprocessor systems

Computers

Controllers

Intelligent instruments

Portable equipment

GENERAL DESCRIPTION

The ADM823/ADM824/ADM825 are supervisory circuits that

monitor power supply voltage levels and code execution integrity

in microprocessor-based systems. In addition to 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.

These parts are 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 (minimum) and 1.6 sec

(typical), respectively.

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

and SOT-23 packages and typically consume only 5 µA, making

them suitable for use in low power, portable applications.

Table 1. Selection Table

Part No.

ADM823

ADM824

ADM825

Watchdog Timer

Yes

Yes

–

Manual Reset

Yes

–

Yes

RESET

Push-Pull

Push-Pull

Push-Pull

Output Stage

RESET

–

Push-Pull

Push-Pull

Rev. D

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