Fully integrated PABX switch matrix
The SC11390 is an integrated analog private automatic branch exchange
(PABX) circuit intended for systems having up to two external lines and
twelve extensions. It provides all transmission, reception, call progress,
and mixing of voice and control signals used in multifeature PABXs. The
SC11390 includes two software-controlled analog switch matrices of 20 x 23
and 4 x 4, respectively, as well as two DTMF transmitters and two DTMF
receivers. Ringing signals to the extensions are provided from two on-chip
ring tone generators. Other features include fax/voice detection,
facilities for conference calls, a speech record/playback interface,
auxiliary inputs, and a parallel microprocessor port. The device comes in
a 68-pin PLCC. ($20 ea/10,000–available now.) Sierra Semiconductor, San
Jose, CA Fred Kamp 408-263-9300 Fax 408-263-3337
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