MAX3209EEUU+

Overview

The MAX3209EEUU+ is a dual DTE RS-232 serial port transceiver designed for motherboards and desktop PCs. It integrates two complete serial ports with six transmitters and ten receivers into a single 38-pin TSSOP package, eliminating the need for a negative power supply through an integrated charge pump. The device operates from a +10.8V to +13.2V VDD supply and a +3V to +5.5V VSTBY logic supply. It supports data rates up to 460kbps and features enhanced ESD protection rated at ±15kV (Human Body Model) and ±8kV (IEC 1000-4-2 Contact Discharge). A low-power standby mode draws a maximum of 100µA, keeping one receiver active per port for system wake-up capabilities.

Feature Summary

• Dual serial ports with six transmitters and ten receivers in a compact 38-pin TSSOP package
• Integrated charge pump eliminates the requirement for a negative voltage supply
• Low-power standby mode maintains one active receiver per port for automatic system wake-up
• Robust ESD protection meets IEC 1000-4-2 standards without external components

Applications

• Desktop PCs
• Motherboards
• Instruments
• Telecommunications equipment requiring IEC 1000-4-2 compliance
• Network servers

Procurement Notes

Verify the component authenticity by checking the manufacturer markings against the official datasheet specifications. Confirm the suffix 'UU' corresponds to the 38-pin TSSOP package and the 'E' indicates the extended temperature range of -40°C to +85°C. Ensure the part number matches the exact ordering information provided by Analog Devices or Maxim Integrated to avoid compatibility issues with existing designs.

Selection Notes

Select this component when designing systems that require dual RS-232 interfaces within space-constrained environments like motherboards. It is suitable for applications needing compliance with strict European ESD regulations. Consider the specific logic voltage requirements; the device supports both 3V and 5V logic families via the VSTBY pin. Ensure the design can accommodate the required +12V supply for the main operation and utilizes small 0.1µF capacitors for the charge pump.

Part Context

The MAX3209E belongs to the Maxim Integrated RS-232 transceiver family, specifically engineered for high-density PC applications. Unlike standard single-port transceivers, this device consolidates two full DTE ports into one footprint. The EE variant denotes the industrial temperature grade, distinguishing it from commercial grade parts. It addresses the industry demand for reduced board space and lower power consumption in legacy serial communication interfaces.

Replacement Considerations

Direct replacements must match the 38-pin TSSOP package and dual-port functionality. Verify that any substitute supports the same +12V supply requirement and offers comparable ESD protection levels. Check if alternative parts support the necessary 460kbps data rate and standby wake-up features. Ensure the replacement is compatible with the intended 3V or 5V logic interface.