MAX3387EEUG+T

Overview

The MAX3387EEUG+T is a 3V-powered TIA/EIA-232 and V.28/V.24 communications interface featuring three receivers and three transmitters with ±15kV ESD protection on all RS-232 inputs and outputs. It operates from a +3.0V to +5.5V supply, utilizing a dual charge pump requiring four 0.1µF capacitors for operation at +3.3V. The device supports data rates up to 250kbps while maintaining compliant output levels. A dedicated VL pin enables compatibility with mixed-voltage logic systems ranging from 1.8V to VCC. Supply current is 300µA during normal operation and reduces to 1µA in AutoShutdown Plus mode when no valid signal transitions are detected for 30 seconds.

Feature Summary

• AutoShutdown Plus technology reduces supply current to 1µA when no valid signal transitions are detected for 30 seconds
• VL pin allows receiver outputs and transmitter input thresholds to be programmable for mixed-voltage system compatibility
• Integrated dual charge pump generates internal +5.5V and -5.5V supplies from a single low-voltage source
• INVALID output indicates the presence or absence of valid RS-232 signals on receiver inputs

Applications

• Subnotebook and Palmtop Computers
• PDAs and PDA Cradles
• Cell Phone Data Cables
• Battery-Powered Equipment
• Hand-Held Equipment Peripherals

Procurement Notes

Verify the specific suffix 'T' corresponds to reel packaging as indicated by distributor listings. Confirm the 'E' designation ensures the extended temperature range of -40°C to +85°C. Ensure the component is lead-free and RoHS-compliant per the '+' marking. Cross-reference the manufacturer part number with official Analog Devices documentation to confirm availability status before procurement.

Selection Notes

Select this component when designing portable devices requiring low-power RS-232 communication with mixed-voltage logic interfaces. The integrated charge pump eliminates the need for external voltage inverters, saving board space. The AutoShutdown Plus feature is critical for battery-operated applications to minimize standby power consumption. Ensure the application requires three independent transmit and receive channels for full-duplex communication plus ring indicator signaling.

Part Context

This component belongs to the MAX3387E family of 3V RS-232 transceivers designed specifically for mobile computing and handheld equipment. It shares functional similarities with other Maxim Integrated low-power interface ICs but distinguishes itself through the VL pin flexibility and robust ESD protection. The device represents a solution for reducing system complexity in PDAs and cell phones by integrating necessary voltage conversion and shutdown control into a single 24-pin TSSOP package.

Replacement Considerations

MAX3387ECUG+