ICS1893AFILF datasheet(111/137 Pages) RENESAS

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Chapter 10

DC and AC Operating Conditions

ICS1893AF, Rev. D 10/26/04

October, 2004

111

ICS1893AF Data Sheet - Release

10.3

Recommended Component Values

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

• 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).

Figure 10-1.

ICS1893AF 10TCSR and 100TCSR

Table 10-3.

Recommended Component Values for ICS1893AF

Parameter

Minimum

Typical

Maximum

Tolerance

Units

Oscillator Frequency

–

± 50 ppm †

MHz

10TCSR Resistor Value

–

2.00k

–

Ω

100TCSR Resistor Value

–

See Figure 10-1

–1%

Ω

LED Resistor Value

510

10k

–

Ω

ICS1893AF

VDD

10TCSR

100TCSR

2.0K

Ω 1%

Note:

1. The VDD connection to the 12.1K resistor can connect to any VDD.

VDD

12.1 K

Ω 1%

10TCSR

1.54K

Ω 1%

100TCSR

Typical Board Layouts

10TCSR and 100TCSR Bias Resistors

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