MAX3185EWP

Overview

The MAX3185EWP is a complete DTE RS-232 serial port transceiver manufactured by Maxim Integrated. It integrates three RS-232 transmitters and five RS-232 receivers within a single 20-pin Wide SO package, eliminating the need for external charge pumps. The device operates with VCC between +4.5V and +5.5V, VDD between +10.8V and +13.2V, and VSS between -10.8V and -13.2V. It supports data rates up to 230kbps and features enhanced ESD protection rated at ±15kV (Human Body Model) and ±8kV (IEC 1000-4-2 Contact Discharge). The industrial temperature range extends from -40°C to +85°C.

Feature Summary

• Enhanced electrostatic discharge protection on all transmitter outputs and receiver inputs without requiring latchup during events.
• Complete DTE serial port solution optimized for desktop PC and motherboard applications through integrated driver and receiver circuits.
• Pin and functionally compatible with industry-standard 75185 devices to facilitate immediate EMC compliance in existing designs.

Applications

• Desktop PC motherboards
• Instruments meeting IEC1000-4-2 standards
• Equipment requiring robust serial communication interfaces

Procurement Notes

Verify the specific ordering suffix 'WP' corresponds to the 20-pin Wide SO package and the '-E' designation confirms the extended industrial temperature range of -40°C to +85°C. Confirm that the component source provides valid traceability documentation. Ensure the procurement channel supplies genuine Maxim Integrated products to guarantee adherence to specified electrical characteristics and ESD protection levels.

Selection Notes

Select this component when designing systems requiring a complete RS-232 interface without external charge pump circuitry. It is suitable for applications needing high ESD immunity to meet European community requirements. Verify that the system power supply can provide the necessary dual voltage rails for VDD and VSS alongside the standard logic VCC.

Part Context

The MAX3185 series serves as an EMC-compliant serial port controller designed primarily for computer motherboards and desktop PCs. It replaces older discrete solutions by integrating multiple drivers and receivers into a compact footprint. The device maintains compatibility with standard TTL/CMOS logic levels while providing the necessary voltage swings for RS-232 communication protocols.

Replacement Considerations

The MAX3185 is pin and functionally compatible with the SN75C185. Designs utilizing the industry-standard 75185 can be upgraded to the MAX3185 to achieve improved EMC performance without altering the board layout or pin connections.