MAX3222EIDWR

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Interface - Drivers, Receivers, Transceivers

MAX3222EIDWR is a high-speed, low-power RS-232 transceiver for serial port applications. This device is ideally suited for use in portable and battery-powered DCE applications such as mobile phones, modems, and other data communication products where power and performance are at a premium. The MAX3222EIDWR integrates three drivers, three receivers, a low-dropout regulator (LDO), and power-on-reset circuit into a single 16-pin QSOP package.

Application Field of MAX3222EIDWR

The MAX3222EIDWR is a low-power, high-speed 3.3V RS-232 transceiver. This device is ideal for applications such as cellular phones, modems, and other data communications products where a compact and efficient solution is needed. The device integrates three drivers, three receivers, a low-dropout linear regulator, and power-on-reset circuit into a single 16-pinQSOP package.

The MAX3222EIDWR is designed for robust ESD protection with up to ± 10 kV for human body model, ± 15 kV for machine model, and ± 5 kV for air-discharge ESD protection. The device also features under-voltage lock-out (UVLO) and a low-18 mV hysteresis. The device provides an output current of up to 200 mA, which allows a wide range of external loads and input voltage ranges, from 4V to 5.5V. The device is designed to provide extended power available to support large capacitive loads of a half dozen lines or more.

Working Principle of MAX3222EIDWR

The MAX3222EIDWR operates by isolating the supply of the device from the logic rails, allowing for a much lower voltage drop at the logic outputs, the deduction drive capability of the device, and resulting in extremely low supply current. The MAX3222EIDWR uses three circuits with separate supplies to operate the three drivers, three receivers and the LDO.

The three drivers are configured into two pairs, where one supplies the current for the driver’s input, and the other driver provides the isolation from the logic rail at the output. The input is also powered by this pair, using a current-limiting resistor to limit the current draw in case of over-load. This ensures a very low power consumption of the device.

The three receivers contain a hysteresis circuit to ensure a smooth transition between logic levels, and a low-noise amplifier with a wide input-voltage range that allows the receiver to operate over a wide range of power levels.

The LDO is used to regulate the voltage applied to the logic rail, and provides a stable power supply in the case of voltage drop-outs. The power supply is only active when the LDO is enabled, thus reducing power consumption of the device.

Conclusion

The MAX3222EIDWR is a high-speed, low-power RS-232 transceiver for serial port applications. The device integrates three drivers, three receivers, a low-dropout regulator, and power-on-reset circuit into a single 16-pin QSOP package. The MAX3222EIDWR provides a very low power consumption, robust ESD protection, and operates over a wide range of power levels. With its comprehensive protection, the MAX3222EIDWR is ideal for applications such as cellular phones, modems, and other data communications products.

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