The MAX3221E/MAX3223E/MAX3243E are 3V-powered EIA/TIA-232 and V.28/V.24 communications interfaces with automatic shutdown/wakeup features, high data-rate capabilities, and enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to ±15kV using IEC 1000-4-2 Air- Gap Discharge, to ±8kV using IEC 1000-4-2 Contact Discharge, and to ±15kV using the Human Body Model. The MAX3221E/MAX3223E/MAX3243E achieve a 1µA supply current with Maxim’s revolutionary AutoShutdown™ feature. They save power without changes to the existing BIOS or operating system by entering low-power shutdown mode when the RS-232 cable is disconnected, or when the transmitters of the connected peripherals are off. The transceivers have a proprietary low-dropout trans- mitter output stage, delivering true RS-232 performance from a +3.0V to +5.5V supply with a dual charge pump. The charge pump requires only four small 0.1µF capaci- tors for operation from a +3.3V supply. Each device is guaranteed to run at data rates of 250kbps while main- taining RS-232 output levels. The MAX3221E contains just one driver and one receiver, making it the smallest single-supply RS-232 transceiver. The MAX3223E has two drivers and two receivers. The MAX3243E is a complete 3-driver/5-receiver serial port ideal for notebook or subnotebook computers. It also includes two noninverting receiver outputs that are always active, allowing external devices to be monitored.
The MAX3221E/MAX3223E/MAX3243E family provides 3 V‑powered EIA/TIA‑232 and V.28/V.24 communication interfaces with automatic shutdown/wakeup, high‑speed data rates and robust ESD protection. They operate from a 3.0 V to 5.5 V supply and guarantee 250 kbps data transmission while maintaining true RS‑232 voltage levels.
Key features include Maxim’s AutoShutdown technology that reduces supply current to 1 µA when no valid RS‑232 signals are present, dual charge‑pump voltage conversion, and multiple driver/receiver configurations: one driver/receiver for MAX3221E, two each for MAX3223E, and three drivers/five receivers for MAX3243E. The devices are offered in space‑saving TQFN, SSOP and TSSOP packages for notebook, handheld and peripheral applications.
| Maximum data rate | 250 kbps |
|---|---|
| Shutdown supply current | 1 µA |
The device draws only 1 µA in shutdown mode thanks to the AutoShutdown feature.
They support a maximum data rate of 250 kbps.