RTL8208 datasheet(7/40 Pages) ETC

Part #	RTL8208

Description	REALTEK SINGLE CHIP OCTAL 10/100 MBPS FAST ETHERNET TRANSCEIVER

PDF	40 Pages

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Manufacturer	ETC [List of Unclassifed Manufacturers]

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7 / 40 page

RTL8208

2001/01/07

Rev.1.923

5.3 Miscellaneous Pins

Pin Name

Type

Description

RESET#

(Pu)

Reset: This is an active low input. To complete the reset function, this

pin must be asserted low for at least 10ms.

114

25MHz Crystal X1 or 25MHz Oscillator clock input: When X1 is

pulled low, X2 must be floating. REFCLK will then be the chip clock

input.

115

25MHz Crystal X2

REFCLK

I/O

Reference clock:

If X1 is 25MHz active, REFCLK is a 50MHz output.

If X1 is pulled-low (disabled), REFCLK is the clock input as below:

50MHz 100ppm clock input for RMII mode.

125MHz 100ppm clock input for SMII/SS-SMII mode.

IBREF

118

Reference Bias Resistor: This pin must be tied to analog ground through

an external 1.96K

Ω resistor when using a 1:1 transformer on Tx/Rx.

VCTRL

116

Voltage control: This pin controls a PNP transistor to generate the

2.5V power supply for VDD and VDDAL pins.

RTL8208 Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers