MAX699CPA+

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The MAX699CPA+, delivered in a miniature 8-pin plastic DIP package, is a supervisor IC (Integrated Circuit) offering a cost-effective and robust solution for watching power-on reset (POR) circuits in microprocessor-based systems. It is part of the comprehensive portfolio of PMIC (Power Management IC) supervisors from Maxim Integrated which help to ensure system reliability, even in extreme temperatures and humid conditions.

The MAX699CPA+ is resistant to high noise and is capable of surviving spikes of up to 25V, and its reset output is specified from 1.5V to 5V. It is also characterized by an accuracy of at least one percent relative to the VDDOP voltage over temperature. Furthermore, the MAX699CPA+ can be used to power up and power down the system and monitor the reset of up to two voltages.

The QHLOCK pin prevents the reset circuit from being locked up after power-failures. Moreover, it has an internal watch-dog timer (WDT) which provides user configurable timeout periods, and a fixed selectable timeout period of 16s. Additionally, the MAX699CPA+ is available in both fixed and adjustable versions, and a preset voltage tolerance of +3%.

Generally, the working principle of the MAX699CPA+ consists in monitoring the power-on reset (POR) circuits of microprocessor-based systems. It works by keeping the reset and WDT output low for the duration of the WDT timeout period. At the time of power-up, the RESET and WDT output goes high. As the voltage at the VDDOP pin rises to above the reset threshold, the RESET and WDT go low. For the duration of the WDT timeout period, the RESET and WDT output remains low. If the operator sets the WDT to a timeout period greater than the internal power-on time, then the RESET and WDT will remain low until the timeout period expires.

The MAX699CPA+ is an ideal choice for applications operating in extreme temperatures and humid conditions, such as medical and industrial. Additionally, this IC can be used in power-on reset circuits, WDT timers, and monitoring of reset of up to two voltages. Typical system applications of the MAX699CPA+ can be found in a variety of mobile devices, industrial control systems, telecom equipment, and gaming consoles.

In conclusion, the MAX699CPA+ is a cost-effective and robust supervisor IC for watching power-on reset (POR) circuits in microprocessor-based systems. It is resistant to high noise, has an internal watch-dog timer (WDT), offers user configurable and fixed selectable timeout periods, and a preset voltage tolerance of +3%. This supervisor IC is ideal for applications operating in extreme environments, and in typical system applications ranging from mobile devices to industrial control systems.

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