The MAX3238 is a true RS-232 transceiver that achieves a 1µA supply current with Maxim’s revolutionary AutoShutdown Plus™ feature. When the device does not sense a valid signal transition on either the receiver or transmitter inputs within 30sec, the on-board power supply and drivers shut down. This occurs if the RS-232 cable is disconnected or if the transmitters of the connected peripheral are inactive. The system turns on again when a valid transition is applied to any RS-232 receiver or transmitter input, saving power without changes to the existing BIOS or operating system.
The MAX3238 is a true RS‑232 transceiver that operates from 3.0 V to 5.5 V and achieves a 1 µA supply current in AutoShutdown Plus mode. It provides a 5‑driver/3‑receiver serial port, a guaranteed 250 kbps data rate, and a dual charge‑pump power supply for true RS‑232 levels.
Key features include the AutoShutdown Plus power‑saving function, an always‑active non‑inverting receiver output (R1OUTB), flow‑through pinout, and compatibility with notebook, sub‑notebook and handheld applications. The device is offered in a space‑saving SSOP28 package and includes detailed electrical characteristics, pin descriptions, and recommended capacitor values for optimal performance.