ICS1893BF Data Sheet - Release
Chapter 8 Pin Diagram, Listings, and Descriptions
Table 8-11. ICS1893BK Configuration Pins
Signal Name
REF_IN
Pin No.
47
Signals Description
Frequency Ref Input: 25MHz Clock or Crystal
Frequency Ref Output for Crystal
System Reset (active low)
REF_OUT
RESETn
46
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8.3.2 Transformer Interface Pins
Transformer connections on the ICS1893BK signals TP_AP, TP_AN, TP_BP and TP_BN are shown in
Table 8-12. The previous TP_CT pin used on the ICS1893AF is not used with the ICS1893BK. The typical
Twisted Pair Transformers connections are shown in Chapter 5. The transformer must be 1:1 ratio and
symetrical for 10/100 MDI/MDIX applications since the transmit twisted pair and receive twisted pair are
interchangeable. ICS1893 PHYs do not have power connections to the Transformer. All transformer power
is supplied by the ICS1893BK.
Note the twisted pairs are polarity sensitive and must connect to the RJ45 with the same polarity as shown
in the figure. Pay particular attention to polarity of the the “B” pair being reversed in pad sequence.
Table 8-12. ICS1893BK Transformer Interface Pins
Signal Name
TP_AP
Pin No.
Signals Description
Twisted Pair A Positive
Twisted Pair A Negative
Twisted Pair B Positive
Twisted Pair B Negative
4
5
9
8
TP_AN
TP_BP
TP_BN
ICS1893BF, Rev. E, 8/11/09
August, 2009
Copyright © 2009, IDT, Inc.
All rights reserved.
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