San Jose, CA--January 27, 1997--IMP Inc. (San Jose, CA) announced the CMOS IMP8980D 256 by 256 channel PCM Digital Crosspoint Switch integrated circuit for digital exchange, PBX, and Central Office applications. The CMOS device switches digital data streams such as Pulse Code Modulated voice, video, or data signals. The IMP8980D establishes a path between any input and output over the internal ST-BUS.
The IMP8980D has eight each ST-BUS input and output pins. By using time division multiplexing, the component level 2,048 kbit per second ST-BUS supports 32 logical data channels at 64 kbits per second at each device input and output pin. ST-BUS bit rate is divided into 8,000 frames with 32 channels per frame.
Two operating modes exist. In Message mode the system microcontroller can pass information onto an output channel. In the non-blocking Switching mode, the output can specify its input channel data source. Multiple outputs can share an input; this is useful in message broadcast applications.
A system microprocessor makes switched connections, writes data to output channels, and can receive data from input channels. In addition, the system microcontroller can concurrently read input channel data and write data to ST-BUS channel outputs.
Large logical switch structures are possible since the IMP8980D can set outputs into a high impedance state on a per channel basis.
Pricing for the 44-pin PLCC IMP8980DP and 40-pin DIP IMP8980DE starts at $7.70 in 1,000 piece quantities. Production quantities and samples are available now.
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San Jose, CA 95134
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