ADM8618

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 re...