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845204AK

Description
CRYSTAL-TO-MLVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM
File Size1MB,13 Pages
ManufacturerIDT (Integrated Device Technology, Inc.)
Websitehttp://www.idt.com/
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845204AK Overview

CRYSTAL-TO-MLVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM

ADVANCE INFORMATION
CRYSTAL-TO-MLVDS PCI EXPRESS™
CLOCK SYNTHESIZER W/SPREAD SPECTRUM
ICS845204
General Description
The ICS845204 is a 4 output PCI Express clock
synthesizer optimized to generate low jitter PCI
HiPerClockS™
Express™ reference clocks with or without spread
spectrum modulation and is a member of the
HiPerClockS™ family of high performance clock
solutions from IDT. Spread type and amount can be configured via
the SSC control pins. Using a 25MHz, 18pF parallel resonant
crystal, the device will generate M-LVDS clocks at either 25MHz,
100MHz, 125MHz or 250MHz. The ICS845204 uses a low jitter
VCO that easily meets PCI Express jitter requirements and is
packaged in a 32-pin VFQFN package.
Features
Four differential spread spectrum clock outputs
Each output can be individually disabled by separate
output-enable inputs
Crystal oscillator interface designed for 18pF,
25MHz parallel resonant crystal
Supports the following output frequencies:
25MHz, 100MHz, 125MHz or 250MHz
VCO range: 250MHz - 700MHz
Supports SSC downspread at 0.05% and -0.75%, centerspread
at ±0.25% and no spread options
Cycle-to-cycle jitter: 50ps (maximum) design target
Period jitter, RMS: TBD
Full 3.3V output supply mode
0°C to 70°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
ICS
Pin Assignment
GND
V
DDA
OE1
32 31 30 29 28 27 26 25
OE0
V
DD
nQ3
Q3
V
DDO
nc
FSEL0
nc
1
2
3
4
5
6
7
8
9
FSEL1
nQ1
nQ0
Q0
nc
Q1
24
23
22
21
20
19
18
17
10 11 12 13 14 15 16
XTAL_OUT
OE2
SSC0
XTAL_IN
GND
OE3
V
DD
nc
nc
GND
Q2
nQ2
SSC1
nc
GND
ICS845204
32 Lead VFQFN
5mm x 5mm x 0.925mm
package body
K Package
Top View
Block Diagram
00
25MHz
PLL Bypass
Q0
nQ0
XTAL_IN
OSC
XTAL_OUT
Phase
Detector
VCO
250-700MHz
01
10
11
÷5
÷4
÷2
Pullup
OE0
Q1
nQ1
Pullup
OE1
Feedback Divider
÷20
Q2
nQ2
Pullup
OE2
SSC[1:0]
Pullup:Pullup
Default = 100MHz
Pulldown:Pullup
2
Spread Spectrum
Control
Q3
nQ3
Pullup
OE3
2
FSEL[1:0]
The Advance Information presented herein represents a product that is developmental or prototype. The noted characteristics are design targets. Integrated
Device Technologies, Inc. (IDT) reserves the right to change any circuitry or specifications without notice.
IDT™ / ICS™
M-LVDS CLOCK SYNTHESIZER
1
ICS845204AK SEPTEMBER 25, 2007

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Description CRYSTAL-TO-MLVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM CRYSTAL-TO-MLVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM CRYSTAL-TO-MLVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM CRYSTAL-TO-MLVDS PCI EXPRESS™ CLOCK SYNTHESIZER W/SPREAD SPECTRUM
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