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Integrated Device Technology Electronic Components Datasheet



ICS874001I-05

PCI EXPRESS JITTER ATTENUATOR



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ICS874001I-05 pdf
PCI EXPRESS™ JITTER ATTENUATOR
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ICS874001I-05
GENERAL DESCRIPTION
The ICS874001I-05 is a high performance Jitter
ICS Attenuator designed for use in PCI Express™ sys-
HiPerClockS™ tems. In some PCI Express systems, such as those
found in desktop PCs, the PCI Express clocks are
generated from a low bandwidth, high phase noise
PLL frequency synthesizer. In these systems, a jitter
attenuator may be required to attenuate high frequency random
and deterministic jitter components from the PLL synthesizer
and from the system board. The ICS874001I-05 has a bandwidth
of 6MHz with <1dB peaking, easily meeting PCI Express Gen2
PLL requirements.
The ICS874001I-05 uses IDT’s 3rd Generation FemtoClockTM
PLL technology to achive the lowest possible phase noise.
The device is packaged in a small 20-pin TSSOP package,
making it ideal for use in space constrained applications such as
PCI Express add-in cards.
FEATURES
One differential LVDS output pair
One differential clock input
CLK and nCLK supports the following input types:
LVPECL, LVDS, LVHSTL, SSTL, HCSL
Output frequency range: 98MHz - 640MHz
Input frequency range: 98MHz - 128MHz
VCO range: 490MHz - 640MHz
Cycle-to-cycle jitter: 50ps (maximum)
3.3V operating supply
• PCI Express (2.5Gb/s) and Gen 2 (5 Gb/s) jitter compliant
-40°C to 85°C ambient operating temperature
Available in lead-free (RoHS 6) package
PIN ASSIGNMENT
PLL_SEL
nc
nc
nc
MR
nc
F_SEL1
VDDA
F_SEL0
VDD
1
2
3
4
5
6
7
8
9
10
20 nc
19 VDDO
18 Q
17 nQ
16 nc
15 nc
14 GND
13 nCLK
12 CLK
11 OE
ICS874001I-05
20-Lead TSSOP
6.5mm x 4.4mm x 0.925mm package body
G Package
Top View
IDT/ ICSPCI EXPRESS JITTERATTENUATOR
1
ICS874001AGI-05 REV. A APRIL 20, 2009



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ICS874001I-05 pdf
ICS874001I-05
PCI EXPRESS™ JITTER ATTENUATOR
BLOCK DIAGRAM
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PLL_SEL Pullup
CLK Pulldown
nCLK Pullup
0 Output Divider
0 0 ÷5
0 1 ÷4
Phase
Detector
VCO
490 - 640MHz
1
1 0 ÷2 (default)
1 1 ÷1
Q
nQ
MR Pulldown
F_SEL[1:0] Pullup/Pulldown
OE Pullup
2
Internal Feedback
÷5
IDT/ ICSPCI EXPRESS JITTERATTENUATOR
2
ICS874001AGI-05 REV. A APRIL 20, 2009



Part Number ICS874001I-05
Description PCI EXPRESS JITTER ATTENUATOR
Maker Integrated Device Technology - Integrated Device Technology
Total Page 17 Pages
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