IDT1893CFLFT IDT, Integrated Device Technology Inc, IDT1893CFLFT Datasheet - Page 85

• Manufacturer Part Number: IDT1893CFLFT
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT1893CFLFT

• Lead Free Status / RoHS Status: Compliant

8.2.1 Transformer Interface Pins
8.2.2 Multi-Function (Multiplexed) Pins: PHY Address and LED Pins
ICS1893CF, Rev. J, 08/11/09
Table 8-3. ICS1893CF Configuration Pins
Transformer connections on the ICS1893CF signals TP_AP, TP_AN, TP_BP and TP_BN are shown in
Table 8.4. The previous TP_CT pin on the ICS1893AF is not used with the ICS1893CF. 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 ICS1893. Note the twisted pair are polarity sensitive and must connect to the RJ45 with
the same polarity as shown in the figure.
Table 8-4
Table 8-4. ICS1893CF Transformer Interface Pins
Table 8-5
Note:
1. During either a power-on reset or a hardware reset, each multi-function configuration pin is an input
2. A software reset does not affect the state of a multi-function configuration pin. During a software reset,
3. Each multi-function configuration pin must be pulled either up or down with a resistor to establish the
4. As outputs, the asserted state of a multi-function configuration pin is the inverse of the sense sampled
TP_AP
TP_AN
TP_BP
TP_BN
Signal Name
that is sampled when the ICS1893CF exits the reset state. After sampling is complete, these pins are
output pins that can drive status LEDs.
all multi-function configuration pins are outputs.
address of the ICS1893CF. LEDs placed in series with these resistors provide a designated status
indicator.
Caution:
during reset. This inversion provides a signal that can illuminate an LED during an asserted state. For
example, if a multi-function configuration pin is pulled down to ground through an LED and a
current-limiting resistor, then the sampled sense of the input is low. To illuminate an LED for the
asserted state requires the output to be high.
Signal Name
REF_OUT
RESETn
ICS1893CF Data Sheet Rev. J - Release
REF_IN
lists the pins for the multi-function group of pins (that is, the multiplexed PHY Address / LED pins).
lists the pins for the transformer interface group of pins.
All pins listed in
Pin No.
12
13
16
15
Pin No.
Copyright © 2009, Integrated Device Technology, Inc.
47
46
23
Table 8-5
Twisted Pair A Positive
Twisted Pair A Negative
Twisted Pair B Positive
Twisted Pair B Negative
Frequency Reference Input: 25 MHz Input Clock or Crystal
Frequency Reference Output for Crystal
System Reset (active low)
must not float.
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85
Chapter 8 Pin Diagram, Listings, and Descriptions
Signal Description
Signal Description
August, 2009