1893BKLFT IDT, 1893BKLFT Datasheet - Page 104

• Manufacturer Part Number: 1893BKLFT
• Description: Ethernet ICs 3.3V 10/100 BASE TX INTEGRATED PHYCEIVER
• Manufacturer: IDT

Specifications of 1893BKLFT

• Rohs: yes
• Part # Aliases: ICS1893BKLFT

8.3.2 Transformer Interface Pins
ICS1893BF, Rev. F, 5/13/10
Table 8-11. ICS1893BK Configuration 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
ICS1893BF Data Sheet - Release
Signal Name
Signal Name
REF_OUT
RESETn
REF_IN
TP_AN
TP_BN
TP_AP
TP_BP
Pin No.
Pin No.
47
46
17
4
5
9
8
Copyright © 2009, IDT, Inc.
All rights reserved.
104
Signals Description
Frequency Ref Input: 25MHz Clock or Crystal
Frequency Ref Output for Crystal
System Reset (active low)
Twisted Pair A Negative
Twisted Pair B Negative
Signals Description
Twisted Pair A Positive
Twisted Pair B Positive
Chapter 8 Pin Diagram, Listings, and Descriptions
May, 2010