CMX635 ISDN Subscriber Processor

Description
The CMX635 is an integrated Subscriber Processor designed for low chip-count ISDN voice/data terminals and POTS terminal adaptors. Its functions facilitate operation in an ISDN feature phone with speakerphone capability or in a POTS terminal adapter with Subscriber Pulse Metering (SPM), DTMF encoder/decoder, Caller Line ID (CLID) and Caller ID on Call Waiting (CIDCW) capabilities. It also implements many functions needed in an intelligent NT or NT1Plus system.
The CMX635 incorporates a 4-wire ST interface conforming to ITU-T I.430 and ETS 300 012-1 specifications. HDLC Controllers and associated FIFOs are provided for B1, B2 and D-channels, which can be configured to automatically process the bit stuffing, flag generation/recognition, address matching and CRC generation/checking required to support the ITU Q.921 protocol. An IOM-2TM /GCI interface is provided to enable operation with other IOM compliant devices.
The µController interface is compatible with multiplexed and non-multiplexed address/data busses and generic Motorola and Intel style control.
The CMX635 will automatically detect which style of interface is being used and configure itself accordingly.
The device is available in a 48-pin TQFP package and has progressive powersave modes to aid low power operation.

Resources: datasheet \| data updates \|

Features ISDN S-BUS to POTS Signalling Interface with HDLC Controller and PCM Codec Multi-Framing to I.430 Support for ISDL HDLC Functions SPM, Ring and Call Progress Tone Generators PCM Codec: Selectable to A-Law or µ-Law Compand Algorithm On-Chip POTS Port Signalling On-Chip SpeakerPhone Functions Two, Independent Differential Analogue Inputs Two, Independent Differential Analogue Outputs Full DTMF Encode/decode Functions POTS CLI/CIDCW Facilities 1024-Byte FIFO Configurable for B and D Channels Programmable IOM2/GCI Peripheral Bus Controller Low Power with Progressive Powersave	Applications ISDN Voice, Data and Signalling Telephones, Payphones and PABX Data Adapters Alarm Systems Active and Passive Terminal Adapters Point-of-Sale Terminals 'Group 4' Fax Equipment Package Styles: - CMX635L4 Supply Requirement: 3.0V power supply

Description The CMX635 is an integrated Subscriber Processor designed for low chip-count ISDN voice/data terminals and POTS terminal adaptors. Its functions facilitate operation in an ISDN feature phone with speakerphone capability or in a POTS terminal adapter with Subscriber Pulse Metering (SPM), DTMF encoder/decoder, Caller Line ID (CLID) and Caller ID on Call Waiting (CIDCW) capabilities. It also implements many functions needed in an intelligent NT or NT1Plus system. The CMX635 incorporates a 4-wire ST interface conforming to ITU-T I.430 and ETS 300 012-1 specifications. HDLC Controllers and associated FIFOs are provided for B1, B2 and D-channels, which can be configured to automatically process the bit stuffing, flag generation/recognition, address matching and CRC generation/checking required to support the ITU Q.921 protocol. An IOM-2TM /GCI interface is provided to enable operation with other IOM compliant devices. The µController interface is compatible with multiplexed and non-multiplexed address/data busses and generic Motorola and Intel style control. The CMX635 will automatically detect which style of interface is being used and configure itself accordingly. The device is available in a 48-pin TQFP package and has progressive powersave modes to aid low power operation.