The MAX3228E/AE and MAX3229E/AE are +2.5V to +5.5V powered EIA/TIA-232 and V.28/V.24 communications interfaces with low power requirements, high data-rate capabilities, and enhanced electrostatic discharge (ESD) protection, in a chip-scale package (UCSP™) and WLP Package. 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. The MAX3228E/AE and MAX3229E/AE achieve a 1µA supply current with Maxim’s AutoShutdown™ feature. They save power without changes to existing BIOS or operating systems 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 RS-232 compliant performance from a +3.1V to +5.5V supply, and RS-232 compatible performance with a supply voltage as low as +2.5V. The dual charge pump requires only four small 0.1µF capacitors for operation from a +3.0V sup- ply. Each device is guaranteed to run at data rates of 250kbps while maintaining RS-232 output levels. The MAX3228E/AE and MAX3229E/AE offer a separate power-supply input for the logic interface, allowing configurable logic levels on the receiver outputs and transmitter inputs. Operating over a +1.65V to VCC range, VL provides the MAX3228E/AE and MAX3229E/AE compatibility with multiple l...
The MAX3228E/AE and MAX3229E/AE are low‑power RS‑232 and V.28/V.24 communication interface chips that operate from +2.5 V to +5.5 V. They feature Maxim’s AutoShutdown technology, which reduces supply current to 1 µA when no valid RS‑232 signals are present, extending battery life in portable devices.
Both devices provide robust ESD protection (±15 kV air‑gap, ±8 kV contact, ±15 kV human‑body model) and operate over an industrial temperature range of –40 °C to +85 °C. The MAX3228E/AE offers two receivers and two transmitters, while the MAX3229E/AE provides one receiver and one transmitter, each guaranteeing a data rate of 250 kbps.
| Supply Voltage Range | +2.5 V to +5.5 V |
|---|---|
| Maximum Data Rate | 250 kbps |
| ESD Protection | ±15 kV (air‑gap), ±8 kV (contact), ±15 kV (human‑body model) |
| AutoShutdown Supply Current | 1 µA |
| Operating Temperature Range | -40 °C to +85 °C |
| Number of Receivers/Transmitters | MAX3228E/AE: 2 receivers, 2 transmitters; MAX3229E/AE: 1 receiver, 1 transmitter |
The device draws only 1 µA in AutoShutdown mode.
Both devices guarantee a data rate of 250 kbps.
The MAX3228E/AE contains two receivers and two transmitters.
The I/O pins are protected to ±15 kV (air‑gap), ±8 kV (contact), and ±15 kV (human‑body model).