CX81801-33

Overview

The CX81801-33 is a controller-based modem integrated circuit manufactured by Conexant. It integrates a modem controller (MCU) and a modem data pump (MDP) within a compact LFQFP package to reduce board space requirements. The device supports V.21, V.22, V.22B, V.23, V.32, V.32B, V.34, V.90, Bell 103, and Bell 212A protocols. It functions as a full-featured worldwide modem solution for reliable data transmission in remote access applications.

Feature Summary

• Integrates modem controller and data pump functions
• Supports multiple international voiceband protocols
• Compact LFQFP package design

Applications

• Remote access systems
• Data communication equipment
• Voiceband modem implementations

Procurement Notes

Verify the specific datasheet version from Synaptics Incorporated or Conexant official sources to confirm pinout compatibility and electrical characteristics. Ensure the component matches the required protocol support for your application. Check package integrity upon receipt. Confirm that the LFQFP-128 package aligns with your PCB footprint requirements before integration into the design.

Selection Notes

Select this component when a complete controller-based modem solution is required without external data pumps. It is suitable for designs needing support for legacy and standard voiceband protocols including V.34 and V.90. Consider the LFQFP-128 package constraints for board layout. This IC is appropriate for applications prioritizing reduced board space and integrated functionality over discrete modem architectures.

Part Context

This part belongs to the Conexant SmartV.XX modem family. These devices are designed as full-featured, worldwide compatible modems. The series typically integrates both control and data processing functions. The CX81801-33 specifically targets applications requiring robust voiceband communication capabilities within a single integrated circuit package.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with alternative Conexant models such as the CX81801-64 or CX81801-84 only if they share identical pinouts and protocol support. Consult official datasheets for direct replacements.