MAX233ACWP+TG36

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Interface - Drivers, Receivers, Transceivers is a technology to provide electric power, logic signals, and data transfer between two different circuits. MAX233ACWP+TG36 is one of the products in this technology, which is a highly versatile, low-power, low-voltage data transceiver with RS232-level control signals featured with a double-pole/double-throw (DPDT) switch with power switch between two signal GNDs. It is noteworthy that this product is designed to work with a logic voltage of +2.7V ~ +5.5V, which is lower than the traditional RS232 logic voltage, and this part also puts out up to +13.3V on the power switch.

The main application field of this product is microprocessor systems, card-edge connectors and handheld electronic equipment, such as mobile phones, notebooks and PDAs. With this product, users can easily integrate the RS232 interface into their subsystems, reducing the power consumption and making the communication interface smaller.

Its working principle is similar to traditional RS232 level converters, which is constructed by operational amplifiers, comparator, high-efficiency switch and bipolar supply (or an OMTP switch in larger packages). In the send direction, an op-amp with an amplifier stage followed by a RC low-pass filter achieves the voltage levels compliant with the RS232 -3dB: approximately 12V for Txd and -12V for Rxd. In the receive direction, a comparator compares the RS232 signal with a reference voltage to achieve the logic outputs at the right voltage levels (0V ~ VCC).

In order to supply power while transmitting, when the transmitting direction is enabled, the power switch is opened and the supply voltage (up to 13.3V) is connected to the receiver outputs. When the transmitting direction is disabled, the power switch turns off, and the receiver outputs are driven to 0V. Besides, this transceiver can be used as an inverter by just changing the logic levels on the CTS and RTS pins.

In summary, MAX233ACWP+TG36 is a perfect product for those who need integrated low-power, low-voltage, and flexible data transceivers. It can significantly reduce power consumption, and provides the advantage of small size and lower parts count.

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