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. 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 transmitter output stage, delivering true RS-232 performance from a +3.0V to +5.5V supply with a dual charge pump. 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.
The MAX3221E, MAX3223E, and MAX3243E are 3‑V‑powered EIA/TIA‑232 and V.28/V.24 communications interfaces with automatic shutdown/wakeup, high‑rate data capability, and robust ESD protection. They provide true RS‑232 performance from a +3.0 V to +5.5 V supply using a dual charge‑pump architecture.
Key features include a 1 µA supply current in AutoShutdown mode, guaranteed 250 kbps data rate, +15 kV human‑body‑model ESD protection, and package options ranging from 16‑pin SSOP to 20‑pin DIP. The devices differ in driver/receiver count: MAX3221E has one driver/receiver, MAX3223E has two of each, and MAX3243E offers three drivers and five receivers, making it suitable for notebook and mouse‑drive applications.
| ESD Protection (Human Body Model) | +15 kV |
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The I/O pins are protected to +15 kV under the Human Body Model.