InsideShowcase (Volume 24) is available in HTML and PDF format. - 316KB
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Single chip interface solution for the 9-pin GeoPort™ hostProduct Features
The SN75LBC773 is the latest in Texas Instruments line of GeoPort transceivers 9-pin Universal Network Bus applications, enabling data transfer up to 4 million bits per second. This makes it ideal for applications such as high speed computer-to-digital telephone/PBX connections, digital still camera interfaces, and serial printer ports. The GeoPort interface is a serial data bus that transfers data over a cable from one piece of equipment to another. The typical system consists of a controller that implements the protocol, an 85C30 USART to serialize/deserialize the data and a SN75LBC773. The transceiver is the link to the outside world and therefore the most vulnerable to hazards like ESD. The 'LBC773 helps to minimize these types of risks with 10 kV of ESD protection, current-limiting and high-impedance outputs on shutdown and power-up. In addition, this device consumes 1/10th the power of comparable (35 mW typ) bipolar devices. A power down mode further reduces power consumption to 165 µW (typ). The device operates from a ±5 V supply and allows high speed digital connections to telephony networks operating at ISDN and T1 data rates. Many more applications require isochronous data flows such as video conferencing and voice/data transfers. Analog modems or other PC add-in cards can include the high-speed digital GeoPort link to increase interconnection options for minimal additional expense.
Vol 24 November, 1997 |
