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Si51211 Data Sheet
Three Output Factory Programmable Clock Generator
The factory programmable Si51211 is a low power, small footprint and frequency flexible
programmable clock generator targeting low power, low cost and high volume consumer
and embedded applications. The device operates from a single crystal or an external
clock source and generates 1 to 3 outputs up to 170 MHz. The device is factory pro-
grammed to provide customized output frequencies and control input such as frequency
select, spread spectrum on, power down and output enable. Center spread spectrum
can also be programmed to reduce EMI to meet board level system requirements.
KEY FEATURES
• Generates up to 3 CMOS clock outputs
from 3 to 170 MHz
• Accepts crystal or reference clock input
• 3 to 165 MHz reference clock input
• 8 to 48 MHz crystal input
• Programmable FSEL, SSONb, PD, and OE
input functions
Applications
• Crystal/XO replacement
• EMI reduction
• Portable devices
• Digital still camera
• IP phone
• Smart meter
2
3
1
5
4
6
To Pin 4 and Pin 6
To Core
Programmable
Configuration
Register
PLL with
Modulation
Control
Buffers,
Dividers,
and
Switch
Matrix
SSCLK1/
REFCLK/
OE/FSEL/
SSONb
SSCLK2/
OE/SSONb/PD
XIN/
CLKIN
XOUT
VDD
VSS
V-REG
8
VDDO
To Pin 7
7
SSCLK3
(VDDO)
silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0
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