MAX702ESA+T

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The MAX702ESA+T is an ideal choice for systems needing reset and power-fail protection. It is a single-supply reset IC, using the latest advances in CMOS circuitry, with the most comprehensive features available. Features like monitoring resistor programmability, a manual reset input, optional manual reset enable and voltage supervisors, enable the user to create a robust, low-cost, power-fail reset solution.

The MAX702ESA+T monitors power supply voltages for both undervoltage and overvoltage conditions. It is available in space-saving 8-pin packages and comes equipped with two independent voltage supervisors. One of the voltage supervisors can be used to monitor the power supply output voltage, while the other supervisor monitors an external voltage rail or a power supply capacitor. This additional reference also allows external control of the reset level.

At the heart of the MAX702ESA+T is its ability to detect low power supply voltages. When the input voltage drops below the level set by the internal resistors, the reset circuit is activated and the reset pin is pulled low. The reset circuit can be triggered even when the power supply voltage level is still above the power-on reset (POR) level.

The MAX702ESA+T also features a manual reset input (MR) that allows the user to manually reset the device if necessary. If a high level is applied to the MR pin, the reset is immediately triggered, regardless of the input voltage level.

In addition to the manual reset feature, the MAX702ESA+T has an optional manual reset enable (MREN) pin. If the MREN pin is held high, the MR input will not reset the chip and the reset will only be triggered when the voltage drops below the POR level. The MREN pin can also be used to allow the user to manually reset the chip without changing the factory-set RST threshold.

The MAX702ESA+T has two voltage supervisors that are used to monitor and compare the power supply voltages. The first voltage supervisor (VMon) determines the POR level for the reset circuit. When the VMon voltage drops below the POR level, the reset circuit is triggered. The other supervisor (VRef), is used to monitor an external voltage rail. This allows a user to optionally monitor an external power supply, like a +3.3V supply, to determine when the power-on reset should be triggered.

Additionally, the voltage supervisors can be used to set a time-delayed start-up for the device, when the external voltage rail is used. This feature is ideal for when the external voltage rail, such as a +3.3V supply, needs to be powered up in sequence with the primary input power supply. After the external voltage rail is powered up, the reset is triggered and the system can start up.

When protecting against overvoltage and undervoltage conditions, the latest MAX702ESA+T is equipped with a new feature that allows the user to configure the trip point for the VMon supervisor. The user can program the VMon trip point by connecting external resistors to the monitoring voltage and ground pins. The user can then change these resistors, using different combinations of resistors to set the trip point to the desired voltage level.

The MAX702ESA+T is an excellent POR device that integrates the latest CMOS technology with an optional manual reset and two independent voltage supervisors. The combination of these features allows the user to design an efficient system that is provided with reset and power-fail protection in the most cost-effective way.

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