ICS1892 datasheet(121/148 Pages) ICST

121 / 148 page

Chapter 10

DC and AC Operating Conditions

ICS1892, Rev. D, 2/26/01

February 26, 2001

121

ICS1892

10.3

Recommended Component Values

Table 10-3 lists the recommended component values for the ICS1892.

Note:

Do not put bypass capacitors across the 10TCSR or 100TCSR resistors. The bypass capacitor will

cause the bandgap circuit to oscillate.

† There are two IEEE Std 802.3 requirements that drive the tolerance for the frequency of the crystal.

• Clause 22.2.2.1 requires the MII TX_CLK to have an accuracy of ± 100 ppm.

• Clause 24.2.3.4 is more stringent. It requires the code-bit timer to have an accuracy of 0.005% (that is, ±50 ppm).

Table 10-3.

Recommended Component Values

Parameter

Minimum

Typical

Maximum

Tolerance

Units

Crystal Frequency

–

± 50 ppm †

MHz

10TCSR Resistor Value

–

2.0k

–

Ω

100TCSR Resistor Value

–

7.15k

–

Ω

LED Resistor Value

510

10k

–

Ω

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