CMX860E1

Telecom Overview

The CMX860E1 is a wireline telephone signalling transceiver from CML Microsystems, designed for low-power applications. It supports data rates from 75bps to 1200bps using FSK modulation and complies with ITU V.32 bis, V.32, V.22 bis, V.22, V.23, and V.21 standards, as well as Bell 212A, Bell 202, and Bell 103 protocols. The device operates on a voltage range of 2.7V to 5.5V and features an integrated analogue front-end with internal hybrid circuits for two- or four-wire line interfaces. Control and data are managed via the C-BUS serial interface.

Telecom Feature Summary

• Integrated single-chip solution combining control, data processing, and telephone signalling functions to reduce design complexity and component count.
• Comprehensive programmable wireline signalling capabilities including standard DTMF encoding and enhanced decoding with high immunity to voice interference.
• Flexible analogue front-end supporting both two-wire and four-wire line interfaces with selectable gain controls and internal hybrid circuits.

Telecom Applications

• Feature phones and payphones
• Low-cost routers and auto-dialling systems
• Alarm and monitoring systems

Telecom Procurement Notes

Verify the specific package suffix 'E1' against the manufacturer's official documentation to confirm pinout compatibility and physical dimensions. Ensure the selected variant matches the required operating voltage range of 2.7V to 5.5V. Confirm that the host system supports the C-BUS serial interface protocol for proper register access and control.

Telecom Selection Notes

Select this component when designing systems requiring multi-standard ITU and Bell data modes with minimal host microcontroller overhead. It is suitable for applications needing line-powered operation due to its ultra-low power requirements. Consider alternative family members like the CMX868A if higher data rates up to 2400bps or additional guard tones are necessary.

Telecom Part Context

The CMX860 belongs to the CML Wireline Signalling and Data family, which includes variants such as the CMX865A, CMX867A, and CMX868A. This family provides an upgrade path for designs migrating between different data rate and signalling requirements while maintaining software and hardware compatibility through shared interfaces and functional blocks.

Telecom Replacement Considerations

The CMX865A offers similar functionality but operates within a narrower 3.0V to 3.6V voltage range. For applications requiring higher data speeds up to 2400bps, the CMX868A is a compatible alternative within the same series.