MAX3243EIPW datasheet | price & pdf

MAX3243EIP serial communication ic

The MAX3243EIP is a handy RS-232 transceiver chip made by Maxim Integrated. It lets you set up standard RS-232 communication easily, using just one single power supply (anywhere from 3.0 to 5.5 volts). One of the best things about this chip is that it has a built-in charge pump, meaning you don’t need extra components to boost voltage, which simplifies your circuit design.

It’s ideal for devices where low power consumption and reliable operation matter—like portable electronics, industrial controls, or communication systems. Plus, it’s built to handle tough conditions, thanks to its robust ±15kV ESD protection, keeping your equipment safe from static damage.

MAX3243EIP pinout

This pin configuration applies to MAX3243EIP in SSOP, SOIC, and TSSOP packages. 

MAX3243EIP equivalent ic

SP3243E: A direct replacement with similar features, including Auto On-Line® and high-speed operation.

XR32431: Offers a wider logic interface voltage range (1.65V–5.5V), making it suitable for systems with lower voltage logic levels.

MAX3243E: Identical functionality; consider different package options if needed.

MAX3232: Suitable for applications requiring fewer channels (2 drivers / 2 receivers).

MAX3243EIP rs232 circuit example

This circuit uses a MAX3232 chip, which is very similar to MAX3243, to convert signals between RS-232 (common in older serial devices) and modern TTL logic (used in microcontrollers and digital circuits).

The chip takes care of converting the lower-voltage signals from a microcontroller (usually 3.3V or 5V) to the higher voltage signals (±12V) needed by the RS-232 standard. It has built-in charge pumps that use external capacitors (four 0.1µF capacitors here) to generate these voltage levels.You see those four capacitors connected around pins 1, 3, 4, 5, 2, and 6? They help the chip internally boost the voltage. This means you don’t need a separate high-voltage supply; the chip creates it internally using just your regular 3.3V or 5V supply.There are two main signal lines from the microcontroller side: “Tx” (transmit) and “Rx” (receive). These signals go into the chip and come out as T1OUT and R1IN, which are connected to pins 2 and 3 on the DB9 connector—this is a standard connector for RS-232 communications.

All in all, it’s a great choice when you need dependable RS-232 connectivity without the hassle of complicated circuitry.