ADM6823MART-RL7中文资料

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Preliminary Technical Data

Low Voltage Supervisory Circuits with Watchdog & Manual Reset in 5-Lead SOT-23

ADM6821–ADM6825

FUNCTIONAL BLOCK DIAGRAM

VFEATURES

Precision Low Voltage Monitoring down to 1.8V 9 Reset Threshold Options: 1.58V to 4.63V

140ms (Min) Reset Timeout

Watchdog Timer with 1.6s Timeout Manual Reset Input Reset Output Stages Push-Pull Active-Low Open-Drain Active-Low Push-Pull Active-High

Low Power Consumption (3µA)

Guaranteed Reset Output valid to VCC=1V Power Supply Glitch Immunity Specified from -40°C to +125°C 5-Lead SOT-23 Package

RESET

MR

APPLICATIONS

Microprocessor Systems Computers Controllers

Intelligent Instruments Portable Equipment

GENERAL DESCRIPTION

The ADM6821-ADM6825 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 means of 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.

Each part is available in a choice of 9 reset threshold options ranging from 1.58V to 4.63V. The reset and watchdog timeout periods are fixed at 140ms (min) and 1.6s (typ), respectively. The ADM6821-ADM6825 are available in 5-lead SOT-23 packages and typically consume only 3µA, making them suitable for use in low power portable applications.

Table 1. Selection Table

Rev. PrA

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