The MAX3225E/MAX3227E/MAX3245E also feature MegaBaudTM operation, guaranteeing 1Mbps for highspeed applications such as communicating with ISDN modems. The MAX3224E/MAX3226E/MAX3244E guarantee 250kbps operation. The transceivers have a proprietary low-dropout transmitter output stage enabling true RS-232 performance from a +3.0V to +5.5V supply with a dual charge pump. The charge pump requires only four small 0.1F capacitors for operation from a 3.3V supply. The MAX3224EMAX3227E feature a logiclevel output (READY) that asserts when the charge pump is regulating and the device is ready to begin transmitting.