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AN-5017 Datasheet(PDF) 5 Page - Fairchild Semiconductor |
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AN-5017 Datasheet(HTML) 5 Page - Fairchild Semiconductor |
5 / 5 page 5 www.fairchildsemi.com Multi-Point Configuration Although LVDS, as defined in the RS644 standard, does not have the dynamic current drive to support a multi-point bus system, there is a high drive LVDS available which has a higher drive compared to the 3.5 mA drive of standard LVDS. Fairchild Semiconductor works on a committee that is addressing a new specification for high drive LVDS, or M-LVDS (Multi-point Low Voltage Differential Signaling). In a multi-point system, the driver can be located at any point along the bus. For this reason, much like the multi- drop center driven bus previously discussed, a termination resistor is required at each end of the bus. This also means that the driver sees the two resistors in parallel and must supply twice the current to the bus. The 11 mA dynamic drive is provided on the high drive version of LVDS to address a multi-point configuration. Figure 9 gives a typical example of a multi-point system. FIGURE 9. Multi-Point Configuration Conclusion Demands for throughputs are growing exponentially and are now exceeding several gigabits per second. Transmis- sion of data across long media lengths demands high speed, low noise solutions. System designers are also always conscious of achieving high throughput while still conserving power. LVDS, with its low swing, differential, current driver solution, will continue to solve throughput requirements for future generations of systems. Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be rea- sonably expected to result in a significant injury to the user. 2. A critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com |
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