SI5350C-B Datasheet, PDF (8/31 Pages) Silicon Laboratories – FACTORY-PROGRAMMABLE ANY-FREQUENCY CMOS CLOCK GENERATOR

Si5350C-B
2. Typical Application
2.1. Si5350C Replaces Multiple Clocks and XOs
The Si5350C is a clock generation device that provides both synchronous and free-running clocks for applications
where power, board size, and cost are critical. An example application is shown in Figure 1. Any other combination
is possible.
Free-running
Clocks
XA
27 MHz
OSC
PLL
XB
Multi
Synth
0
Multi
Synth
1
Multi
Synth
2
CLK0
CLK1
CLK2
125 MHz
48 MHz
28.322 MHz
Ethernet
PHY
USB
Controller
HDMI
Port
CLKIN
54 MHz
PLL
Si5350C
Multi
Synth
3
Multi
Synth
4
Multi
Synth
5
CLK3
74.25 MHz
CLK4 _{74.25/1.001 MHz}
CLK5
24.576 MHz
Video/Audio
Processor
Synchronous
Clocks
Figure 1. Replacing multiple XTAL/XOs and PLLs with one Si5350C
2.2. Applying a Reference Clock at XTAL Input
The Si5350C can be driven with a clock signal through the XA input pin. This is especially useful when in need of
generating clock outputs in two synchronization domains; one reference clock can be provided at the CLKIN pin
and at XA.
V_IN = 1 V_PP
25/27 MHz
XA
0.1 µF
XB
OSC
PLLA
PLLB
Note: Float the XB input while driving
the XA input with a clock
Multi
Synth
0
Multi
Synth
1
Multi
Synth
N
Figure 2. Si5350C Driven by a Clock Signal
8
Rev. 1.0