MAX3224, MAX3225, MAX3226, MAX3227, MAX3244, MAX3245 1�A Supply Current, 1Mbps, 3.0V To 5.5V, RS-232 Transceivers With AutoShutdown Plus

The MAX3224 MAX3225 MAX3226 MAX3227 MAX3244 MAX3245 are 3V-powered EIA/TIA-232 and V.28/V.24 Communications Interfaces with Automatic shutdown/wakeup features and high data-rate capabilities. All devices achieve a 1A supply current using Maxim's revolutionary AutoShutdown Plus feature. These devices automatically enter a low-power shutdown mode when the RS-232 cable is disconnected or the transmitters of the connected peripherals are inactive, and the UART driving the transmitter inputs is inactive for more than 30 seconds. They turn on again when they sense a valid transition at any transmitter or receiver input. AutoShutdown Plus saves power without changes to the existing BIOS or operating system. The MAX3225 MAX3227 MAX3245 also feature MegaBaud operation, guaranteeing 1Mbps for highspeed applications such as communicating with ISDN modems. The MAX3224 MAX3226 MAX3244 guarantee 250kbps operation. The transceiv 77d ers 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 MAX3224 MAX3225 MAX3226 MAX3227 MAX3244 MAX3245 feature a logic-level output (READY) that asserts when the Charge Pump is regulating and the device is ready to begin transmitting. All devices are available in a space-saving TSSOP and SSOP packages. By Maxim Integrated Products