ksz8041tl-ftl Micrel Semiconductor, ksz8041tl-ftl Datasheet - Page 30

• Manufacturer Part Number: ksz8041tl-ftl
• Description: 10base-t/100base-tx/100base-fx Physical Layer Transceiver
• Manufacturer: Micrel Semiconductor

Micrel, Inc.
Reference Clock Connection Options
A crystal or clock source, such as an oscillator, is used to provide the reference clock for the KSZ8041TL/FTL. The
reference clock is 25 MHz for MII mode, 50 MHz for RMII mode, and 125 MHz for SMII mode. The following three figures
illustrate how to connect the reference clock to XI / REFCLK / CLOCK (pin 9) and XO (pin 8) of the KSZ8041TL/FTL.
April 2007
22pF
22pF
22pF
22pF
25MHz XTAL
+/-50ppm
Figure 6. 25MHz Crystal / Oscillator Reference Clock for MII Mode
Figure 8. 125MHz Oscillator Reference Clock for SMII Mode
Figure 7. 50MHz Oscillator Reference Clock for RMII Mode
XI
XO
125MHz OSC
+/-100ppm
NC
NC
CLOCK
XO
30
25MHz OSC
+/-50ppm
NC
NC
XI
XO
M9999-042707-1.1
KSZ8041TL/FTL