The MAX3380E/MAX3381E are +2.35V to +5.5V-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 on both the TTL and RS-232 sides. They have two receivers and two transmitters. All RS-232 inputs, outputs, and logic input pins are protected to ±15kV using IEC 1000-4-2 Air-Gap Discharge method and the Human Body Model, and ±8kV using IEC 1000-4-2 Contact Discharge method. The proprietary low-dropout transmitter output stage enables true RS-232 performance from a +3.1V to +5.5V supply with a dual charge pump. The parts reduce the transmitter output levels to RS-232-compatible levels with no increase in supply current for supplies less than +3.1V and greater than +2.35V. The +2.35V to +5.5V operating range is fully compatible with lithium-ion (Li+) batteries. The charge pump requires only four small 0.1µF capacitors for operation. The MAX3380E/MAX3381E transceivers use Maxim’s revolutionary AutoShutdown Plus™ feature to automatically enter a 1µA shutdown mode. These devices shut down the on-board power supply and drivers when they do not sense a valid signal transition for 30 seconds on either the receiver or transmitter inputs. The MAX3380E is capable of transmitting data at rates of 460kbps while maintaining RS-232 output levels, and the MAX3381E operates at data rates up to 250kbps.
The MAX3380E and MAX3381E are dual‑receiver, dual‑transmitter RS‑232 transceivers that operate from +2.35 V to +5.5 V. They feature Maxim’s AutoShutdown Plus™ circuitry, which reduces supply current to 1 µA after 30 seconds of inactivity, and provide +15 kV ESD protection on all I/O pins.
These devices are supplied in a 20‑pin TSSOP package and support data rates up to 460 kbps (MAX3380E) or 250 kbps (MAX3381E). They are designed for battery‑powered applications such as cell‑phone data cables, PDA interfaces, GPS receivers, and digital cameras.
| Supply voltage range | +2.35 V to +5.5 V |
|---|---|
| Maximum data rate (MAX3380E) | 460 kbps |
| Maximum data rate (MAX3381E) | 250 kbps |
| Package | 20‑Pin TSSOP |
| ESD protection | +15 kV (Human Body Model & IEC 1000‑4‑2) |
| Operating temperature range | -40 °C to +85 °C |
The MAX3380E can transmit data at up to 460 kbps.
All I/O pins are protected to +15 kV using IEC 1000‑4‑2 air‑gap discharge and Human Body Model methods.
They operate from +2.35 V up to +5.5 V, covering the full Li‑ion battery range.