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FEATURES

UNIVERSAL PABX TONE GENERATOR

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Generates PBX supervisory tones in

PCM format

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Integrated time slot allocation circuitry

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No noticeable level changes in tones

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Frame synch. signal source (internal/

external) selectable

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Eight tone programs

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Eight independent PCM tone streams

within each program

4092

PDS039-SA9401-001

REV. C

07-05-96

SA9401

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Each of these tone streams selectable

from 16 tone blocks

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Seperate Intrude Tone for each pro-

gram

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Choice of clock frequencies

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Watchdog facility

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Low power CMOS technology

PROGRAMMABLE FEATURES

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Tone samples

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Tone Cadence timing

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Tone to time-slot mapping

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Size of tone blocks

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Intrude tone frequency

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Intrude tone cadence

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"silence sample" value

DESCRIPTION

The SA9401 operates in conjunction with a standard EPROM to generate the system

tone plans for the PABX systems of most major countries.

The high level of programmability allows the SA9401 to satisfy a wide variety of tone

plans. Furthermore by providing three inputs to select between one of eight tone

programs during initialisation, the device effectively facilitates the design of a universally

programmable "PABX Processor Card". Because the tone program inputs are latched

at the start of each PCM frame the SA9401 minimises the possibility of glitches.

The SA9401 can also generate the PCM Frame synchronising reference signal if

required.