The MAX3224–MAX3227/MAX3244/MAX3245 are 3VpoweredEIA/TIA-232 and V.28/V.24 communicationsinterfaces with automatic shutdown/wakeup featuresand high data-rate capabilities.All devices achieve a 1μA supply current using Maxim’srevolutionary AutoShutdown Plus™ feature. Thesedevices automatically enter a low-power shutdownmode when the RS-232 cable is disconnected or thetransmitters of the connected peripherals are inactive,and the UART driving the transmitter inputs is inactivefor more than 30 seconds. They turn on again whenthey sense a valid transition at any transmitter or receiverinput. AutoShutdown Plus saves power withoutchanges to the existing BIOS or operating system.The MAX3225/MAX3227/MAX3245 also featureMegaBaud™ operation, guaranteeing 1Mbps for highspeedapplications such as communicating with ISDNmodems. The MAX3224/MAX3226/MAX3244 guarantee250kbps operation. The transceivers have a proprietarylow-dropout transmitter output stage enabling true RS-232 performance from a +3.0V to +5.5V supply with adual charge pump. The charge pump requires only foursmall 0.1μF capacitors for operation from a 3.3V supply.The MAX3224–MAX3227 feature a logic-level output(READY) that asserts when the charge pump is regulatingand the device is ready to begin transmitting.All devices are available in a space-saving SSOP package.
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