ICS1893CF Data Sheet Rev. J - Release
Chapter 8 Pin Diagram, Listings, and Descriptions
8.2.3 Configuration Pins
Table 8-6 lists the configuration pins.
Table 8-6. Configuration Pins
Pin
Pin
Pin
Pin Description
Name
Number
Type
10/100SEL
9
Output 10Base-T / 100Base-TX Select.
• This pin acts as an output that indicates the current status of this
pin. In this case, when the signal on this pin is logic:
– Low, this pin indicates 10Base-T operations are selected.
– High, this pin indicates 100Base-TX operations are selected.
10TCSR
19
20
Output 10M Transmit Current Set Resistor.
• A resistor, connected between this pin and ground, is required to
establish the value of the transmit current used in 10Base-T mode.
• The value and tolerance of this resistor is specified in Section 9.3,
“Recommended Component Values *”.
100TCSR
Output 100M Transmit Current Set Resistor.
• A resistor, connected between this pin and ground, is required to
establish the value of the transmit current used in 100Base-TX
mode.
• The value and tolerance of this resistor is specified in Section 9.3,
“Recommended Component Values *”.
REF_IN
47
Input
(Frequency) Reference Input.
This pin is connected to a 25-MHz oscillator. For a tolerance, see
Section 9.5.1, “Timing for Clock Reference In (REF_IN) Pin”.
REF_OUT
RESETn
46
23
Output (Frequency) Reference Output.
This pin is used with a crystal.
Input
(System) Reset (Active Low).
• When the signal on this active-low pin is logic:
– Low, the ICS1893CF is in hardware reset.
– High, the ICS1893CF is operational.
• For more information on hardware resets, see the following:
– Section 4.1.2.1, “Hardware Reset”
– Section 9.5.16, “Reset: Hardware Reset and Power-Down”
ICS1893CF, Rev. J, 08/11/09
August, 2009
Copyright © 2009, Integrated Device Technology, Inc.
All rights reserved.
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IDT [ INTEGRATED DEVICE TECHNOLOGY ]
