MAX3387EEUG

Overview

The MAX3387EEUG is a 3V-powered RS-232 transceiver featuring three receivers and three transmitters. It operates on a +3.0V to +5.5V supply with a typical current of 300µA, reducing to 1µA in AutoShutdown Plus mode. The device supports data rates up to 250kbps and includes ±15kV ESD protection on inputs and outputs. It utilizes a dual charge pump requiring four 0.1µF capacitors for operation at +3.3V. The component is housed in a 24-pin TSSOP package and functions within a temperature range of -40°C to +85°C.

Feature Summary

• AutoShutdown Plus technology reduces supply current to 1µA when no valid signal transitions are detected for 30 seconds.
• Integrated V_L pin allows logic-level compatibility with mixed-voltage systems ranging from 1.8V to V_CC.
• Robust electrostatic discharge protection rated at ±15kV via Human Body Model and IEC 1000-4-2 standards.

Applications

• Subnotebook and Palmtop Computers
• PDAs and PDA Cradles
• Cell Phone Data Cables

Procurement Notes

Verify the specific suffix 'E' confirms the extended industrial temperature range (-40°C to +85°C) compared to the commercial variant. Confirm RoHS compliance status indicated by the '+' designation. Ensure the 24-TSSOP footprint matches the target PCB layout requirements before finalizing procurement orders.

Selection Notes

Select this component for battery-operated portable devices requiring low quiescent current and high ESD immunity. The separate V_L supply pin is critical for interfacing with baseband processors operating at logic levels lower than the main system voltage. Ensure adequate decoupling capacitors are placed near the charge pump pins to maintain stable internal voltage generation.

Part Context

This part belongs to the Maxim Integrated MAX3387E family of low-power RS-232 transceivers. The 'EEUG' designation specifically identifies the industrial temperature grade version packaged in a 24-pin Thin Shrink Small Outline Package (TSSOP). It serves as a direct interface between TTL/CMOS logic devices and standard RS-232 serial ports.

Replacement Considerations

The MAX3387ECUG+ is the commercial temperature range equivalent (0°C to +70°C) with identical electrical characteristics and pinout.

FAQ

How does the INVALID output function?

The INVALID output indicates the presence of a valid RS-232 signal on the receiver inputs. It goes high when a valid signal is detected and low when inputs are idle or out of threshold range.

What is the purpose of the FORCEON and FORCEOFF pins?

These pins allow manual override of the AutoShutdown Plus circuitry. Driving FORCEOFF low forces the transmitters off, while driving FORCEON high forces them on, bypassing automatic power-down detection.

Can the MAX3387E operate with a 1.8V logic supply?

Yes, the V_L pin can be connected to a 1.8V supply to interface with low-voltage baseband logic, provided the main V_CC supply remains between 3.0V and 5.5V.