SI52147 Datasheet, PDF (1/22 Pages) Silicon Laboratories – PCI-EXPRESS GEN 1, GEN 2, & GEN 3 NINE OUTPUT CLOCK GENERATOR

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
 Low power push-pull type
differential output buffers
 I²C support with readback
capabilities
 Integrated resistors on differential _{ Triangular spread spectrum}
clocks
profile for maximum
 Output enable pin for all clocks
electromagnetic interference
 Hardware selectable spread
(EMI) reduction
control
 Industrial temperature:
 Nine PCI-Express clocks
–40 to 85 ^oC
 3.3 V power supply
 48-pin QFN package
Ordering Information:
See page 20.
Applications
 Network attached storage
 Multi-function printer
 Wireless access point
 Routers
Description
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.
Functional Block Diagram
XIN/CLKIN
XOUT
PLL1
(SSC)
Divider
SCLK
SDATA
CKPWRGD/PDB
OE [8:0]
SSON
Control & Memory
Control RAM
DIFF0
DIFF1
DIFF2
DIFF3
DIFF4
DIFF5
DIFF6
DIFF7
DIFF8
Pin Assignments
48 47 46 45 44 43 42 41 40 39 38 37
VDD 1
36 DIFF8
VDD 2
35 DIFF8
OE0¹ 3
34 VDD
OE1¹ 4
SSON² 5
VSS_PLL3 6
VSS_PLL4 7
OE2¹ 8
OE3¹ 9
OE[4:5]¹ 10
OE[6:8]¹ 11
VDD 12
49
GND
33 DIFF7
32 DIFF7
31 DIFF6
30 DIFF6
29 VDD
28 DIFF5
27 DIFF5
26 DIFF4
25 DIFF4
13 14 15 16 17 18 19 20 21 22 23 24
Notes:
1. Internal 100 kohm pull-up.
2. Internal 100 kohm pull-down.
Patents pending
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.