MAX3185CWP+

Overview

The MAX3185CWP+ 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 an internal charge pump. The device guarantees data rates up to 230kbps and operates with VCC between +4.5V and +5.5V, VDD between +10.8V and +13.2V, and VSS between -10.8V and -13.2V. Supply currents are less than 300µA for IDD and ISS, and less than 1mA for ICC. It provides enhanced ESD protection of ±15kV (Human Body Model) and ±8kV (IEC 1000-4-2 Contact Discharge). The component is housed in a 20-pin SO package and supports an operating temperature range of 0°C to +70°C.

Feature Summary

• Enhanced ESD protection on all transmitter outputs and receiver inputs.

Applications

• Desktop PC motherboards
• Instruments meeting IEC1000-4-2 standards

Procurement Notes

Verify the specific suffix 'CWP+' against official manufacturer documentation to confirm the exact package type, temperature rating, and lead-free status. Ensure compatibility with existing designs by confirming pinout alignment with industry-standard 75185 components. Cross-reference datasheet revisions to validate current electrical specifications before finalizing procurement.

Selection Notes

Select this component when designing systems requiring robust ESD immunity for RS-232 interfaces without the complexity of external charge pumps. It serves as a direct functional replacement for the SN75C185 series, facilitating easier upgrades to EMC-compliant designs. Verify that the power supply rails match the required voltage ranges for optimal performance.

Part Context

The MAX3185 series represents a specialized line of RS-232 transceivers optimized for personal computer hardware. Manufactured by Maxim Integrated, now part of Analog Devices Inc., these devices address the stringent electromagnetic compatibility requirements prevalent in European markets. The C variant specifically denotes the commercial temperature grade suitable for standard office environments.

Replacement Considerations

The MAX3185CWP+ is pin and functionally compatible with the industry-standard SN75C185. Designers can utilize this substitution to instantly achieve EMC compliance in existing layouts without modifying the board footprint or signal routing.

FAQ

Does the MAX3185CWP+ include an internal charge pump?

No, the MAX3185CWP+ does not include an internal charge pump, which optimizes it for operation in desktop PC and motherboard applications.

What is the guaranteed maximum data rate for the MAX3185CWP+?

The MAX3185CWP+ is guaranteed to run at data rates up to 230kbps.

How does the MAX3185CWP+ handle electrostatic discharge?

All transmitter outputs and receiver inputs are protected to ±15kV using the Human Body Model and ±8kV using IEC 1000-4-2 Contact Discharge.