Rev. 1.4 4/16 Copyright © 2016 by Silicon Laboratories Si52146
Si52146
PCI-EXPRESS GEN 1, GEN 2, GEN 3, & GEN 4 SIX OUTPUT
C
LOCK GENERATOR
Features
Applications
Description
The Si52146 is a high-performance, PCIe clock generator that can source six
PCIe clocks from a 25 MHz crystal or clock input. The clock outputs are
compliant to PCIe Gen 1, Gen 2, Gen 3, Gen 3 SRNS and Gen 4 common
clock specifications. The device has six output enable control pins for
enabling and disabling differential outputs. A spread spectrum control pin for
EMI reduction is also available. The small footprint and low power
consumption makes the Si52146 the ideal clock solution for consumer and
embedded applications. Measuring PCIe clock jitter is quick and easy with the
Silicon Labs PCIe Clock Jitter Tool. Download it for free at www.silabs.com/
pcie-learningcenter.
Functional Block Diagram
PCI-Express Gen 1, Gen 2, Gen 3,
and Gen 4 common clock compliant
Gen 3 SRNS Compliant
Supports Serial-ATA (SATA) at
100 MHz
Low power push-pull HCSL
compatible differential outputs
No termination resistors required
Dedicated output enable pins for
each clock
Pin selectable spread control
Up to six PCI-Express clock outputs
25 MHz crystal input or clock input
I
2
C support with readback
capabilities
Triangular spread spectrum profile
for maximum electromagnetic
interference (EMI) reduction
Industrial temperature:
–40 to 85 °C
3.3 V Power supply
32-pin QFN package
Network attached storage
Multi-function printer
Wireless access point
Switches
Control RAM
Control & Memory
XIN/CLKIN
XOUT
SCLK
SDATA
OE [5:0]
CKPWRGD/PDB
SSON
DIFF3
DIFF5
PLL1
(SSC)
Divider
DIFF4
DIFF0
DIFF2
DIFF1
Patents pending
Ordering Information:
See page 18
Pin Assignments
9 10 11 12 13
14 15 16
VDD_DIFF
OE_DIFF2
1
SSON
2
OE_DIFF3
1
OE_DIFF5
1
OE_DIFF4
1
XI N/CLKI N
XOUT
VDD_CORE
1
2
3
4
5
6
30 29 28 27 26 25
24
23
22
21
20
19
DIFF0
DIFF0
DIFF1
DIFF1
VDD_DIFF
DIFF2
CKPWRGD/PDB
1
SDATA
SCLK
VDD_DIFF
DIFF5
DIFF5
VDD_DIFF
DIFF4
DIFF4
VDD_DIFF
NC
7
8
DIFF2
VDD_DIFF
18
17
DIFF3
DIFF3
OE_DIFF1
1
OE_DIFF0
1
32 31
Notes:
1. Internal 100 kohm pull-up.
2. Internal 100 kohm pull-down.
33
GND
