ICS874003-05 Datasheet, PDF (1/18 Pages) Integrated Device Technology – PCI EXPRESS™ JITTER ATTENUATOR

PCI EXPRESS™ JITTER ATTENUATOR
ICS874003-05
General Description
The ICS874003-05 is a high performance
ICS
Differential-to-LVDS Jitter Attenuator designed for
HiPerClockS™ _{use in PCI Express systems. 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 ICS874003-05
has a bandwidth of 6.2MHz with <1dB peaking, easily meeting
PCI Express Gen2 PLL requirements.
The ICS874003-05 uses IDT’s 3^rd Generation FemtoClock™ PLL
technology to achieve the lowest possible phase noise. The device
is packaged in a 20 Lead TSSOP package, making it ideal for use
in space constrained applications such as PCI Express add-in
cards.
Features
• Three differential LVDS output pairs
• One differential clock input
• CLK/nCLK can accept the following differential input levels:
LVPECL, LVDS, LVHSTL, HCSL, SSTL
• Input frequency range: 98MHz to 128MHz
• Output frequency range: 98MHz to 320MHz
• VCO range: 490MHz - 640MHz
• Supports PCI-Express Spread-Spectrum Clocking
• High PLL bandwidth allows for better input tracking
• PCI Express (2.5 Gb/s) and Gen 2 (5 Gb/S) jitter compliant
• 0°C to 70°C ambient operating temperature
• Full 3.3V operating supply
• Available in lead-free (RoHS 6) packages
F_SEL[2:0] Function Table
Inputs
F_SEL2 F_SEL1 F_SEL0
0 (default) 0 (default) 0 (default)
1
0
0
0
1
0
1
1
0
0
0
1
1
0
1
0
1
1
1
1
1
Outputs
QA[0:1], nQA[0:1] QB0, nQB0
÷2
÷2
÷5
÷2
÷4
÷2
÷2
÷4
÷2
÷5
÷5
÷4
÷4
÷5
÷4
÷4
Pin Assignment
QA1 1
VDDO 2
QA0 3
nQA0 4
MR 5
F_SEL0 6
nc 7
VDDA 8
F_SEL1 9
V_DD 10
20 nQA1
19 VDDO
18 QB0
17 nQB0
16 F_SEL2
15 OEB
14 GND
13 nCLK
12 CLK
11 OEA
ICS874003-05
20-Lead TSSOP
6.5mm x 4.4mm x 0.925mm package body
G Package
Top View
IDT™ / ICS™ PCI EXPRESS™ JITTER ATTENUATOR
1
ICS874003BG-05 REV. A APRIL 15, 2009