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4610H-803-500103 Datasheet(PDF) 46 Page - Bourns Electronic Solutions |
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4610H-803-500103 Datasheet(HTML) 46 Page - Bourns Electronic Solutions |
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46 / 62 page  Specifications are subject to change without notice. 322 FOR PRODUCT SPECIFICATIONS, SEE PAGES 307 AND 308. Bus termination (in this case, RC termination technique) considerably reduces overshoots and ringings. Transmission lines require termination when the time it takes the signal to travel from one end of the line to the other (the propagation delay) amounts to 1/2 or more of the edge rate of the signal (signal rise time or fall time). In other words, termina- tion is required when: Tpd > (1/2)Te Te = edge rate Tpd = propagation delay Present high-speed logic families have typical rise times of 2 nanoseconds, while the propagation delay of a common PCB is about 1.77 ns per foot. Applying the above relationship, a trans- mission line will require termination if it is longer than 7 inches. High performance systems will commonly need Bourns termi- nation networks for CPU address, data, and control lines. In addition, clock inputs, write and read strobe lines, chip select or output enable lines of high speed devices such as static RAMs, PROMs, and PLDs will also need termination networks. TERMINATION TYPICAL ADDS RESISTOR CAPACITOR TECHNIQUE POWER DELAY VALUE VALUE USAGE RC MEDIUM NO Zo 200-500pF General Description This series of RC Networks is designed to eliminate transmis- sion line effects, such as signal reflections and ringing which influence high speed CMOS. The Networks capacitor blocks DC currents while acting as a short circuit during signal transmi- tions, thus reducing power consumption. The capacitor also holds the bus at the last logic level to avoid excessive currents. Block Diagram Of CPU/BUS Configuration Bus Termination Applications Of Bourns Networks At high frequencies, the traces on a printed circuit board act as transmission lines—in which impedance mismatches can cause distortion of signals on that line. Terminating the lines with resistor or resistor-capacitor networks provides the means to match impedances and reduce signal distortion. RC Terminator Networks 700 Series |
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