CMX869BE2

Overview

The CMX869BE2 is a low-power V.32 bis automode modem IC manufactured by CML Microcircuits, designed for EPOS terminals and telephone telemetry systems. It supports ITU V.32 bis automode operation with automatic fallback from 14400 bps down to 4800 bps, alongside manual mode support for V.22 bis, V.22, V.21, Bell 103, V.23, and Bell 202 protocols. The device integrates a high-performance DTMF codec, ring detector, and relay driver. It operates on a single 3.3V supply within an industrial temperature range of -40°C to +85°C and is housed in a 24-pin TSSOP package.

Feature Summary

• Integrates multi-standard QAM and FSK modulation/demodulation capabilities for full duplex communication.
• Includes a software-controlled hook switch relay driver and a dedicated ring signal detector circuit.
• Features a flexible host interface via C-BUS serial bus supporting asynchronous, synchronous, and HDLC data modes.
• Provides integrated line interface circuits including hybrid and gain control requiring only passive external components.

Applications

• EPOS (Electronic Point of Sale) terminals
• Telephone-based information and telemetry systems
• Remote utility meter reading equipment
• Security systems and electronic cash terminals

Procurement Notes

Verify the specific suffix 'E2' corresponds to the 24-pin TSSOP package variant when sourcing. Confirm that the operating voltage requirements align with the specified 3.3V supply rail. Ensure the procurement documentation references the correct datasheet version D/869B/3 for accurate electrical characteristics and pinout definitions.

Selection Notes

Select this component for applications requiring a highly integrated solution for standard telephone line modems. It is suitable where space constraints favor a single-chip design over discrete modem implementations. Consider the power consumption profile if battery-operated devices are involved, noting the availability of a powersave standby mode.

Part Context

This part belongs to the CMX869B family of low-power modems. The 'E2' suffix specifically denotes the 24-pin Thin Shrink Small Outline Package (TSSOP). Other variants in the family may utilize different packaging such as SOIC or offer slight variations in feature sets, but share the core modem functionality.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Designers should consult the manufacturer's website for current alternative recommendations or updated component listings.