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844204BK-245LFT

Description
IC clk synthesizer 4lvds 32vfqfn
Categorysemiconductor    Analog mixed-signal IC   
File Size263KB,13 Pages
ManufacturerIDT (Integrated Device Technology, Inc.)
Websitehttp://www.idt.com/
Environmental Compliance  
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844204BK-245LFT Overview

IC clk synthesizer 4lvds 32vfqfn

844204BK-245LFT Parametric

Parameter NameAttribute value
Datasheets
ICS844204-245
Standard Package2,500
CategoryIntegrated Circuits (ICs)
FamilyClock/Timing - Application Specific
PackagingTape & Reel (TR)
PLLYes
Main PurposePCI Express (PCIe)
InpuCrystal
OutpuLVDS
Number of Circuits1
Ratio - InpuOutpu
Differential - InpuOutpu
Frequency - Max250MHz
Voltage - Supply3.135 V ~ 3.465 V
Operating Temperature0°C ~ 70°C
Mounting TypeSurface Mou
Package / Case32-VFQFN Exposed Pad
Supplier Device Package32-VFQFN (5x5)
Other NamesICS844204BK-245LFTICS844204BK-245LFT-ND
PRELIMINARY
CRYSTAL-TO-LVDS PCI EXPRESS™
CLOCK SYNTHESIZER W/SPREAD SPECTRUM
ICS844204-245
G
ENERAL
D
ESCRIPTION
The ICS844204-245 is a 4 output PCI Express clock
IC
S
synthesizer optimized to generate low jitter PCIe
HiPerClockS™
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 LVDS clocks at either 25MHz, 100MHz, 125MHz or
250MHz. The ICS844204-245 uses a low jitter VCO that easily
meets PCI Express jitter requirements and is packaged in a
32-pin VFQFN package.
F
EATURES
• Four LVDS outputs at 25MHz, 100MHz, 125MHz or 250MHz
• Crystal oscillator interface, 25MHz, 18pF parallel resonant
crystal
• Supports the following output frequencies:
25MHz, 100MHz, 125MHz or 250MHz
• VCO range: 240MHz - 700MHz
• Supports SSC downspread at 0.50% and -0.75%,
centerspread at ±0.25% and no spread options
• Cycle-to-cycle jitter: 70ps (typical)
• Period jitter: 40ps (typical)
• Full 3.3V power supply mode
• 0°C to 70°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
GND
GND
V
DDO
V
DDA
nQ1
nQ0
Q1
Q0
P
IN
A
SSIGNMENT
V
DD
V
DD
1
2
3
4
5
6
7
8
32 31 30 29 28 27 26 25
24
nc
nc
GND
Q2
nQ2
SSC1
nc
GND
ICS844204-245
32-Lead VFQFN
5mm x 5mm x 0.75mm
package body
K Package
Top View
23
22
21
20
19
18
17
B
LOCK
D
IAGRAM
OEA
Pullup
Q0
25MHz
nQ3
Q3
V
DDO
nc
FSEL0
nc
XTAL_IN
OSC
XTAL_OUT
Phase
Detector
VCO
240-700MHz
00
01
10
11
PLL Bypass
÷5
÷4
÷2
nQ0
Q1
nQ1
Q2
nQ2
Q3
9 10 11 12 13 14 15 16
FSEL1
SSC0
V
DD
OEB
XTAL_IN
XTAL_OUT
OEA
GND
Feedback Divider
÷20
SSC[1:0]
Pullup:Pullup
Default = 100MHz
Pulldown:Pullup
2
Spread Spectrum
Control
nQ3
2
FSEL[1:0]
OEB
Pullup
The Preliminary Information presented herein represents a product in pre-production. The noted characteristics are based on initial product characterization
and/or qualification. Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT
/ ICS
LVDS PCI EXPRESS™ CLOCK SYNTHESIZER
1
ICS844204BK-245 REV. A JULY 9, 2007

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