This datasheet introduces the features and characteristics of the MAX3388E/MAX3389E series products. MAX3388E/MAX3389E are 2.5V powered EIA/TIA-232 and V.28/V.24 communication interfaces with low power requirements, high data-rate capabilities and enhanced electrostatic discharge (ESD) protection. In addition to the traditional RS-232 I/O, these devices have dedicated logic-level I/O pins for additional device-to-device handshaking.
The MAX3388E and MAX3389E are 2.5 V‑powered RS‑232 transceivers designed for PDAs, cell phones and other battery‑powered equipment. They provide two receivers, three transmitters, and a dedicated logic‑level I/O pin (VL) for mixed‑voltage systems, with an internal 62 Ω switch for powering external circuitry.
The devices offer up to 460 kbps data rates, ±15 kV ESD protection (Human Body Model, Air‑Gap, and Contact methods), and a shutdown supply current of less than 1 µA. They are supplied in a 24‑pin TSSOP package and include detailed pin descriptions, timing charts, and application notes for handheld and sub‑notebook designs.
| Supply Voltage (VCC) | +2.35 V to +3.0 V |
|---|---|
| Maximum Data Rate | 460 kbps |
| ESD Protection | ±15 kV HBM, ±8 kV Contact, ±15 kV Air‑Gap |
| Receivers / Transmitters | 2 receivers, 3 transmitters |
| Package | 24‑pin TSSOP |
The devices can operate at data rates up to 460 kbps while maintaining RS‑232‑compatible output levels.
They offer ±15 kV protection with the Human Body Model, ±15 kV Air‑Gap discharge, and ±8 kV Contact discharge per IEC 1000‑4‑2.
The VL pin allows the input and output logic levels to be programmed for compatibility with mixed‑voltage systems.