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RCD16-47BRL Datasheet(PDF) 2 Page - STMicroelectronics

Part # RCD16-47BRL
Description  RCD NETWORK FOR BUS TERMINATION
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

RCD16-47BRL Datasheet(HTML) 2 Page - STMicroelectronics

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With the increasing speed of data transmission (PC, TV, ...), engineersare naturally confrontedwith effects
that were of less significance with slower circuits. Among these are the effects described in transmission
line theory : line reflections provide signal distortions and the overshoots or undershoots produced on the
signal edges can finally cause the malfunction of the whole system.
1. Reflection at a non terminated line
The figure below shows the circuit of a transmission system in which a memory device (input impedance of
100 k
Ω) is connectedat the end of a line with line impedance Zo.
APPLICATION NOTE : BUS TERMINATION
10
100 k
If this line is not properly terminated, a certain amount of the energy is reflected back, inducing a reflection
phenomena that can distort the signal. This can result in improper operation of the system.
The simulation shown on the above figure illustrates the signal distortion produced by line reflection at the
end of the line which is not well terminated.
Even if the signal at the start of the line has the correct form (upper curve), considerable distortion arises at
the end of the line (lower curve). On the positive edge, the overshoot can exceed the maximum operating
voltage of the used circuit technology which will then be destroyed. Also, the following negativeundershoot
may reach a level low enough to change the value of the logic state. If it affects of an address line, a wrong
memory cell will be addressed, and in the case of a data line, the data can be corrupted.
This phenomena also occurs on the falling edge.
To avoid these negative effects from leading to problems in a system, a suitable termination is
required.
RCD16-47B
2/7


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