SI52146 Datasheet, PDF (1/20 Pages) Silicon Laboratories – PCI-EXPRESS GEN 1, GEN 2, & GEN 3 SIX OUTPUT CLOCK GENERATOR

Si52146
PCI-EXPRESS GEN 1, GEN 2, & GEN 3 SIX 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
 Dedicated output enable pin for electromagnetic interference
each clock
(EMI) reduction
 Hardware selectable spread
control
 Six PCI-Express clocks
 Industrial temperature:
–40 to 85 ^oC
 3.3 V Power supply
 32-pin QFN package
Ordering Information:
See page 18
Applications
 Network attached storage
 Multi-function printer
 Wireless access point
 Routers
Description
The Si52146 is a spread-controlled PCIe clock generator that can source
six PCIe clocks simultaneously. The device has six hardware inputs for
enabling the respective outputs on the fly while powered on along with the
spread control hardware pin to enable Spread for EMI reduction.
Functional Block Diagram
Pin Assignments
32 31 30 29 28 27 26 25
VDD 1
OE2¹ 2
SSON² 3
OE3¹ 4
OE4¹ 5
OE5¹ 6
33
GND
24 VDD
23 DIFF5
22 DIFF5
21 VDD
20 DIFF4
19 DIFF4
NC 7
VDD 8
18 DIFF3
17 DIFF3
9 10 11 12 13 14 15 16
Notes:
1. Internal 100 kohm pull-up.
2. Internal 100 kohm pull-down.
XIN/CLKIN
XOUT
PLL1
(SSC)
Divider
DIFF0
DIFF1
DIFF2
DIFF3
Patents pending
SCLK
SDATA
CKPWRGD/PDB
OE [5:0]
SSON
Control & Memory
Control RAM
DIFF4
DIFF5
Preliminary Rev. 0.1 12/11
Copyright © 2011 by Silicon Laboratories
Si52146
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.