Texas Instruments MAX3222IDWR, RS-232 transceiver, full duplex, 2 drivers / 2 receivers, 250 kbps data rate, 3V to 5.5V supply, -40°C to 85°C, 20-SOIC wide package.
| Parameter | Value |
|---|---|
| Type | Transceiver |
| Mounting | Surface Mount |
| Supply voltage | 3V ~ 5.5V |
| Protocol | RS232 |
| Operating temperature | -40°C~85°C |
| Duplex | Full |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Data rate | 250kbps |
| Case | 20-SOIC (0.295\", 7.50mm Width) |
| Receiver hysteresis | 300 mV |
| Number of drivers (Receivers) | 2/2 |
Rated at 250 kbps, this transceiver handles 115200 baud with substantial margin — about 2x the symbol rate needed. The 300 mV receiver hysteresis provides noise rejection on longer cable runs, which is where RS-232 links typically pick up ground offset and crosstalk.
The 20-SOIC wide-body (7.50 mm width) is a common footprint; the 1.27 mm pitch makes hand-assembly and inspection straightforward.
The MAX3222IDWR is rated for 250 kbps, which is over double the 115200 baud rate. It handles that common serial speed with comfortable margin, even with the receiver hysteresis set at 300 mV for noise immunity.
It accepts a supply range of 3V to 5.5V, so it works on both 3.3V and 5V rails without modification.
Within the MAX3222 family, the MAX3222IDB (16-SOIC) is a narrower package variant but not pin-compatible due to different body width. The MAX3222ECUP (20-TSSOP) offers the same 2/2 driver/receiver count in a smaller footprint but requires a layout change. For a direct drop-in, stay with the 20-SOIC wide-body variants sharing the same base number.