SI5317C-C-GMR Silicon Laboratories Inc, SI5317C-C-GMR Datasheet - Page 29

• Manufacturer Part Number: SI5317C-C-GMR
• Manufacturer: Silicon Laboratories Inc

Specifications of SI5317C-C-GMR

• Lead Free Status / RoHS Status: Supplier Unconfirmed

5. Crystal/Reference Clock Input
The device can use an external crystal or external clock as a reference. If an external clock is used, it must be ac
coupled. With appropriate buffers, the same external reference clock can be applied to CKIN. Although the
reference clock input can be driven single ended (See Figure 14), the best performance is with a crystal or
differential clock source.
External Clock Source
LVPECL, CML, etc.
Figure 16. Differential External Reference Clock Input Example
Figure 15. Sinewave External Reference Clock Input Example
3.3 V
8 mA output current
CMOS buffer,
0 dBm into 50 
Figure 14. CMOS External Reference Circuit
For 2.5 V operation, change 130  to 82 .
130 
100

50 
0.01 F
3.3 V
150 
150 
Rev. 1.0
0.1 F
0.01 F
0.01 F
0.01 F
0.1 F
0.1 µF
XA
XA
XB
XB
XB
XA
10 pF
Si5317
10 k
Si5317
Si5317
10 k
0.6 V
10 k
10 k
0.6 V
0.6 V
1.2 V
1.2 V
Si5317
29