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ADM8618

Analog Devices
Part Number ADM8618
Manufacturer Analog Devices
Description Low-Voltage Manual Reset & Watchdog Supervisory Circuits
Published Jan 1, 2010
Detailed Description Preliminary Technical Data FEATURES Precision 1.8V to 5V Power Supply Monitoring 9 Reset Threshold Options: 1.58V to 4.6...
Datasheet PDF File ADM8618 PDF File

ADM8618
ADM8618

Overview
Preliminary Technical Data FEATURES Precision 1.
8V to 5V Power Supply Monitoring 9 Reset Threshold Options: 1.
58V to 4.
63V 140ms (Min) Reset Timeout Manual Reset Input (ADM8611) Watchdog Timer (ADM8616–ADM8618) 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 Over -40°C to +85°C Temperature Range 4-Lead SC70 Package Low-Voltage Manual Reset & Watchdog Supervisory Circuits in 4-Lead SC70 ADM8611/ADM8616/ADM8617/ADM8618 FUNCTIONAL BLOCK DIAGRAMS VCC ADM8616 VCC VREF RESET GENERATOR RESET WATCHDOG DETECTOR GND WDI APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Portable Equipment Figure 1.
GENERAL DESCRIPTION The ADM8611/ADM8616/ADM8617/ADM8618 are supervisory circuits which monitor power supply voltage levels and code execution integrity in microprocessor-based systems.
A power-on-reset signal is generated when the supply voltage rises to a preset threshold level.
The ADM8611’s debounced www.
DataSheet4U.
com manual reset input can be used to initiate a reset by means of an external push-button or logic signal.
The ADM8616–ADM8618 have an on-chip watchdog timer which can reset the microprocessor if it fails to strobe within a preset timeout period.
Each part is available in a choice of the following 9 reset threshold options: 1.
58V, 1.
67V, 2.
19V, 2.
32V, 2.
63V, 2.
93V, 3.
08V, 4.
38V and 4.
63V.
The reset timeout periods are 20ms (min) and 140ms (min) for the ADM8611 and ADM8616– ADM8618, respectively.
The watchdog timeout period is 1.
6s (typ).
The parts differ in terms of reset output configuration, as indicated in table 1.
The ADM8611/ADM8616/ADM8617/ADM8618 are available in 4-lead SC70 packages and typically consume only 3µA, making them suitable for use in low power portable applications.
Table 1.
Selection Table Part No.
ADM8611 ADM8616 ADM8617 ADM8618 Manual Reset Yes Watchdog Yes Yes ...


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