MAX3185CAP+

Overview

The MAX3185CAP+ is a complete DTE RS-232 serial port 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 is available in a 20-pin SSOP 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
• Pin and functionally compatible with the industry-standard 75185
• Flow-through pinout configuration for simplified layout
• Latchup-free operation during electrostatic discharge events

Applications

• Desktop PC motherboards
• Instruments meeting IEC1000-4-2 standards
• Equipment requiring EMC compliance

Procurement Notes

Verify the specific suffix CAP+ indicates the commercial temperature grade and SSOP packaging when sourcing replacements. Confirm that the ordering information matches the required voltage ranges and interface compatibility before finalizing procurement decisions.

Selection Notes

Select this component for designs requiring direct replacement for SN75C185 circuits without redesigning the PCB footprint. Ensure the system power supplies can provide the necessary VDD and VSS voltages, as the device lacks an internal charge pump for generating these levels from a single supply.

Part Context

The MAX3185 series serves as a robust serial port solution optimized for high-density board layouts. The CAP+ variant specifically denotes the shrink small-outline package suitable for space-constrained applications like modern motherboards while maintaining full RS-232 signal integrity.

Replacement Considerations

The MAX3185 is pin-compatible with the SN75C185. Verify that the substitute component maintains the same flow-through pinout and ESD protection ratings to ensure immediate functionality without circuit modification.