MAX6388XS27D2-T

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The MAX6388XS27D2-T (hereinafter, MAX6388) is a system supervisory integrated circuit that is designed to provide reset signals and LED control features both in power-up and power-down operations. It is part of a family of system supervisors from Maxim Integrated which is specific for microprocessor (MCU) and digital signal processor (DSP) applications. It acts as an integrating circuit between the power supply, the processor and the memory which helps the processor to power on faster and minimize the occurrence of false resets during normal operations. This paper will discuss the application field, and the working principle of the MAX6388 in detail.

The MAX6388 is part of the MAX6388XS27 family of supervisor chips from Maxim Integrated and it has been designed with embedded systems in mind, targeting applications such as SMS or GSM where the processor and data lines have to be constantly monitored. It provides a number of features to control the power-off and power-up reset and enable signals, including reset thresholds, reset-out active-low window, power and enable functions.

The MAX6388 is designed to be used with 3.3 V or 5 V processors, such as the Intel Pentium family or Motorola 68000, and can be controlled with an I/O pin. It also has power-fail inputs, independent enable inputs and reset outputs, as well as a manual reset input capability. The circuit is enabled by a logic state of 0 at the enable inputs and is disabled when the enable inputs are in a logic state of 1. It also has active-low reset-out outputs, providing manual reset capability for power-up and power-down conditions.

The MAX6388 contains several components to achieve its core functionality, including a reset generator, a reset generator enable circuit, a reset active-low window circuit, a power-fail detector, a soft start circuit and a manual reset input circuit. The reset generator produces a reset signal at power-up, triggered by the rising VCCONE. When the VCCONE voltage is higher than VTH, the reset generator is enabled and the reset generator enable signal RGE is generated to reset the processor. The reset active-low window circuit provides a reset signal active-low window when the VCCONE voltage reaches a certain voltage level and when the VCCONE voltage drops below a certain level. The power-fail detector monitors the supply voltage V VDDONE and generates a power-fail signal when it drops below a specified threshold.

The MAX6388 also contains a soft start circuit and a manual reset input circuit. The soft start circuit prevents the high inrush current when the system is turned on, by slowly charging the capacitor C1. It works by slowly increasing the voltage level applied at the source. The manual reset input circuit allows the user to manually reset the processor from outside by grounding the manual reset pin.

In summary, the MAX6388 is a system supervisor integrated circuit from Maxim Integrated which is specifically designed for 3.3 V or 5 V processors and embedded systems like SMS or GSM. It works by providing a reset signal active-low window at power-up, triggered by the rising VCCONE voltage, and a power-fail signal when the VDDONE voltage drops below the specified threshold. It also provides a soft start circuit and a manual reset input circuit to manually reset the processor from outside.

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