MAX3232ECPWG4

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The MAX3232ECPWG4 is an integrated circuit manufacturer by Maxim Integrated, and is a three-driver-receiver RS-232 line transceiver. It is the successor to the MAX232 and its greatest advantage is that it includes an integrated power supply, in the form of a low-power on-chip charge pump generator. This power supply requires no external supply voltage and runs from just a single 5V supply. Additionally, this chip also features an improved version of Maxim\'s proprietary low power logic and integrated damping capacitors.

Applications

The MAX3232ECPWG4 is designed for applications that involve using RS-232 communication lines at low data rates. It is ideal for system architectures such as multi-drop networks, where multiple slaves are connected to a single master. As the protocol used for low-speed serial communications, RS-232 is commonly used in point-of-sale (POS) systems, barcode readers, card readers and other types of data acquisition systems. Additionally, the MAX3232ECPWG4 may be used in embedded distributed control systems, where data must be communicated between various controllers.

Features

The MAX3232ECPWG4 is a bit of an engineering marvel, as it combines low power requirement, flexibility, and electrical protection (ESD protection) into a single package. Specifically, it includes: a 3-driver line or dual driver/receiver line transceiver; a low-voltage power supply; and on-chip ESD protection (ESD protection up to 2000 V HBM). Additionally, its low power requirements allow it to easily run from a single 5V supply as well as 3V and 3.3V supplies, for increased design flexibility. The package also features a low-power shutdown mode, and is available in the standard SOIC-16 (small-outline) package.

Working Principle

The MAX3232ECPWG4 uses an on-chip charge pump and loop filter to generate 3.3V and ±5V power supplies. This allows the device to operate with a single 5V supply. The MAX3232ECPWG4 includes three drivers, which convert the 3.3V or 5V logic signals into the RS-232 voltage levels. The drivers are designed to meet the EIA/TIA- 232-F specification and have current limiting and thermal shutdown protection circuits to protect them from excessive load currents. The drivers also feature an output short-circuit protection circuit and are capable of sinking up to 200mA.

The MAX3232ECPWG4 also includes two receivers. They are designed to meet the EIA/TIA-232-F specification for voltage and capacitance levels, and also have current limiting and thermal shutdown protection circuits to protect them from excessive load currents. The receivers have an input short-circuit protection circuit and are capable of sinking and sourcing up to 30mA.

The MAX3232ECPWG4 also includes on-chip ESD protection (ESD protection up to 2000 V HBM). This protection is provided by diodes connected between the drivers and receivers, as well as a Zener diode between the transmitter outputs and the supply. Additionally, the device also features an integrated damping capacitor for maximum signal integrity.

Conclusion

The MAX3232ECPWG4 is an impressive integrated circuit that combines low power requirement, flexibility, and electrical protection into a single package. It is designed for applications that involve using RS-232 communication lines at low data rates, and is ideal for use in data acquisition, point-of-sale systems, and distributed control systems. The most impressive feature of the MAX3232ECPWG4 is its integrated charge pump and loop filter, which generate the necessary voltage levels from just a single 5V power supply, eliminating the need for an additional voltage source.

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