MAX3185CWP+T

Overview

The MAX3185CWP+T is a complete DTE RS-232 serial port transceiver designed for desktop PC and motherboard applications. It features three RS-232 transmitters and five RS-232 receivers without requiring an internal charge pump. The device guarantees data rates up to 230kbps and operates with supply currents less than 300µA for VCC/VSS and less than 1mA for VDD. It provides enhanced ESD protection rated at ±15kV (Human Body Model), ±8kV (IEC 1000-4-2 Contact Discharge), and ±15kV (IEC 1000-4-2 Air-Gap Discharge). The component functions within a temperature range of 0°C to +70°C and utilizes a 20-pin SO package.

Feature Summary

• Enhanced ESD protection on all transmitter outputs and receiver inputs ensures compliance with stringent European EMC requirements.
• Pin and functionally compatible with the industry-standard SN75C185, allowing direct replacement in existing designs.
• Eliminates the need for external charge pumps by supporting standard dual-supply operation for simplified circuit design.

Applications

• Desktop PC motherboards
• Instruments meeting IEC1000-4-2 standards
• Equipment requiring robust ESD protection

Procurement Notes

Verify the specific suffix 'CWP' corresponds to the commercial temperature range and SOIC package before procurement. Confirm that the '+T' designation aligns with current manufacturing lot specifications. Ensure the supplier source is authorized to prevent counterfeit components. Check for any recent product discontinuance notices from Analog Devices or Maxim Integrated regarding this specific part number.

Selection Notes

Select this component when designing systems requiring pin-compatible upgrades to SN75C185 with improved ESD resilience. It is suitable for applications needing guaranteed 230kbps performance without charge pump complexity. Verify that the system power supplies can provide the required VCC, VDD, and VSS rails within the specified voltage ranges for proper operation.

Part Context

The MAX3185 series serves as a specialized interface solution for legacy RS-232 communication ports in computing hardware. Manufactured by Maxim Integrated, now part of Analog Devices, these devices bridge TTL/CMOS logic levels to RS-232 voltages. The C variant specifically targets commercial environments, distinguishing it from the E variant used in industrial settings.

Replacement Considerations

The SN75C185 is a confirmed pin-compatible substitute. Designers replacing the MAX3185CWP+T with the SN75C185 must account for differences in ESD protection ratings and ensure the new component meets the specific EMC requirements of the target application.