ICS1893CF datasheet(97/127 Pages) IDT

97 / 127 page

Chapter 8 Pin Diagram, Listings, and Descriptions

ICS1893CF, Rev. J, 08/11/09

August, 2009

ICS1893CF Data Sheet Rev. J - Release

8.3.2 Transformer Interface Pins

Transformer connections on the ICS1893CK signals TP_AP, TP_AN, TP_BP and TP_BN are shown in

Table 8-12. The previous TP_CT pin used on the ICS1893CF is not used with the ICS1893CK. 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 ICS1893CK.

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.

REF_IN

Frequency Ref Input: 25MHz Clock or Crystal

REF_OUT

Frequency Ref Output for Crystal

RESETn

System Reset (active low)

Table 8-12. ICS1893CK Transformer Interface Pins

Signal Name

Pin No.

Signals Description

TP_AP

Twisted Pair A Positive

TP_AN

Twisted Pair A Negative

TP_BP

Twisted Pair B Positive

TP_BN

Twisted Pair B Negative

Table 8-11. ICS1893CK Configuration Pins

Signal Name

Pin No.

Signals Description

ICS1893CF Datenblatt(PDF) 97 Page - Integrated Device Technology