AN246 데이터 시트보기 (PDF) - Philips Electronics
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AN246 Datasheet PDF : 13 Pages
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Philips Semiconductors
Transmission lines and terminations
with Philips Logic families
Application Note
AN246
Figure 13. Reflections from source termination
SH00106
Other Series Termination Schemes
Figure 14 shows a series termination used with a star stub topology.
Receiver A Receiver B
Driver
RS
ZO
RS = ZO – Rdriver
Receiver C Receiver D
SH00118
Figure 14. Series termination with star stub routing
Stub electrical lengths should be very short, about 10% of the signal
edge, to prevent reflections. This method is useful for terminating
clocks and other asynchronous signals if stubs are of equal
length/delay. Terminating methods for some alternative star routing
is shown in Figure 15.
RS = ZO/3 – RD
ZO
Driver
RD
RS
ZO
ZO
1998 Feb 05
Equal delay branches
Driver
RD
RS
ZO
RS
ZO
RS
ZO
10
Unequal delay branches
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