MAX3386ECUP+T

Overview

The MAX3386ECUP+T is a 3V-powered RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It features three transmitters and two receivers, supporting data rates up to 250kbps with full-duplex communication. The device operates on a supply voltage range of +3.0V to +5.5V and includes a dedicated VL pin for mixed-voltage logic compatibility. It incorporates a dual charge pump requiring four small capacitors and provides enhanced ESD protection rated at ±25kV via the IEC 1000-4-2 Air-Gap Discharge method. The component is housed in a 20-pin TSSOP package and functions within an operating temperature range of 0°C to +70°C.

Feature Summary

• Features a dedicated VL pin that allows interoperation in mixed-logic voltage systems by programming both input and output logic levels.
• Provides enhanced electrostatic discharge (ESD) protection on all RS-232 inputs and outputs, ensuring robustness against static electricity.
• Utilizes a proprietary low-dropout transmitter output stage enabled by a dual charge pump to deliver true RS-232 performance from a single low-voltage supply.

Applications

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

Procurement Notes

Verify the specific suffix 'C' indicates the commercial temperature range (0°C to +70°C), distinct from the 'E' variant which supports extended temperatures (-40°C to +85°C). Confirm RoHS compliance status associated with the '+T' tape-and-reel packaging designation. Ensure the ordering information matches the exact manufacturer part number to avoid functional discrepancies related to thermal ratings or packaging formats.

Selection Notes

Select this component when designing battery-powered equipment requiring low power consumption and high data-rate capabilities. The inclusion of a third transmitter specifically supports ring indicator signals for cradle applications. Verify that the system logic voltage aligns with the VL pin requirements, which must be between 1.8V and VCC, to ensure proper interface compatibility with host microcontrollers.

Part Context

This device belongs to the MAX3386E family of RS-232 transceivers designed for portable electronics. The 'C' suffix denotes the commercial temperature grade, differentiating it from the 'E' suffix used for extended industrial grades. Both variants share identical electrical characteristics and pin configurations but differ strictly in their specified operating temperature ranges.

Replacement Considerations

The MAX3386EEUP serves as a direct pin-compatible alternative offering an extended temperature range of -40°C to +85°C compared to the commercial range of the ECUP variant. Other members of the MAX3386E family may provide similar functionality but require verification of temperature specifications and packaging options before substitution.

FAQ

How does the VL pin function in mixed-voltage systems?

The VL pin acts as a separate logic supply input that sets the output voltage level for receiver outputs and defines the input thresholds for transmitters and shutdown logic, allowing flexibility in interfacing with various logic families.

What are the specific ESD protection ratings for this device?

The device offers ±25kV protection using the IEC 1000-4-2 Air-Gap Discharge method, ±8kV using the Contact Discharge method, and ±15kV using the Human Body Model.

What is the purpose of the third transmitter in this transceiver?

The third transmitter is designed to handle ring indicator (RI) signals, allowing a cradled device like a PDA or cell phone to alert the PC's UART without requiring software-intensive polling.