The Texas Instruments MAX3222ECDWR is a full-duplex RS-232 transceiver that handles two driver and two receiver channels (2/2) in a 20-SOIC surface-mount package. The 500 kbps data rate covers standard UART speeds up to 115.2 kbps with margin, and the 300 mV receiver hysteresis cleans up noise on longer cable runs. This is a commercial-temperature part (0°C to 70°C), suited for desktop peripherals, point-of-sale terminals, and telecom interface cards where the ambient stays indoors.
Supply compatibility — 3.3V and 5V without a level shifter
No external level translator or separate VCC for the charge pump is needed — the on-chip charge pump generates the RS-232 voltage levels from the single supply rail.
Data rate headroom for real UART traffic
Rated at 500 kbps, the MAX3222ECDWR comfortably handles standard baud rates up to 115.2 kbps and still has margin for 230.4 kbps or 460.8 kbps links. For designs that only need 115.2 kbps, the extra headroom means the charge pump isn't pushed to its limit, keeping EMI lower.
The supplier device package is 20-SOIC. It's a surface-mount part, so it reflows with standard lead-free profiles. No thermal pad or exposed paddle — just the standard SOIC land pattern.