The MAX3224E/MAX3225E/MAX3226E/MAX3227E/MAX3244E/MAX3245E 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, ±8kV using IEC 1000-4-2 Contact Discharge, and ±15kV using the Human Body Model. All devices achieve a 1µA 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 MAX3225E/MAX3227E/MAX3245E also feature MegaBaud™ operation, guaranteeing 1Mbps for high-speed applications such as communicating with ISDN modems. The MAX3224E/MAX3226E/MAX3244E guarantee 250kbps operation. The transceivers 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 0.1µF capacitors for operation from a 3.3V supply. The MAX3224E–MAX3227E feature a
The MAX3224E‑MAX3227E and MAX3244E/MAX3245E families are 3 V‑powered RS‑232/TIA‑232 transceivers with AutoShutdown Plus, MegaBaud operation, and up to +15 kV ESD protection. They operate from a 3.0 V to 5.5 V supply and are available in compact SSOP and TSSOP packages, making them suitable for notebook, handheld, and battery‑powered applications.
Key functional blocks include a dual charge‑pump voltage converter that generates ±5.5 V from a single‑supply input, a READY output that indicates when the device is powered and the charge pump is active, and pin‑compatible interfaces for easy integration. Detailed electrical, timing, and pin‑description tables provide designers with the data needed for implementation.
| Maximum Data Rate (MAX3225E/MAX3227E/MAX3245E) | 1 Mbps |
|---|---|
| Maximum Data Rate (MAX3224E/MAX3226E/MAX3244E) | 250 kbps |
| Operating Temperature Range | -40 °C to +85 °C |
The MAX3224E guarantees a maximum data rate of 250 kbps.
The devices operate from a 3.0 V to 5.5 V supply.