Si52147
PCI-EXPRESS GEN 1, GEN 2, & GEN 3 NINE OUTPUT
CLOCK GENERATOR
Features
PCI-Express Gen 1, Gen 2, &
25 MHz crystal input or clock
Gen 3 compliant
input
2
Low power push-pull type
I C support with readback
differential output buffers
capabilities
Integrated resistors on differential
Triangular spread spectrum
profile for maximum
clocks
Output enable pin for all clocks
electromagnetic interference
(EMI) reduction
Hardware selectable spread
control
Industrial temperature:
o
Nine PCI-Express clocks
–40 to 85 C
Ordering Information:
3.3 V power supply
48-pin QFN package
See page 20.
Pin Assignments
Applications
Network attached storage
Multi-function printer
Wireless access point
Routers
48
47
46
45
44
43
42
41
40
39
38
37
DIFF8
DIFF8
36
35
34
33
VDD
1
2
3
4
VDD
Description
OE01
VDD
DIFF7
OE11
32 DIFF7
SSON2
VSS_PLL3
VSS_PLL4
OE21
5
6
7
8
9
The Si52147 is a spread-controlled PCIe clock generator that can source
nine PCIe clocks simultaneously. The device has six hardware output
enable control inputs for enabling the respective differential outputs on the
fly while powered on along with the hardware spread control for EMI
reduction.
31
30
29
28
DIFF6
DIFF6
49
GND
VDD
OE31
DIFF5
27 DIFF5
OE[4:5]1 10
DIFF4
DIFF4
26
25
OE[6:8]1
11
12
VDD
13
14
15
16
17
18
19
20
21
22
23
24
Functional Block Diagram
Notes:
1. Internal 100 kohm pull-up.
2. Internal 100 kohm pull-down.
Patents pending
DIFF0
XIN/CLKIN
XOUT
DIFF1
DIFF2
DIFF3
PLL1
Divider
DIFF4
(SSC)
DIFF5
DIFF6
SCLK
Control & Memory
SDATA
DIFF7
CKPWRGD/PDB
Control
RAM
OE [8:0]
SSON
DIFF8
Preliminary Rev. 0.1 12/11
Copyright © 2011 by Silicon Laboratories
Si52147
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
SILICON [ SILICON ]
