ICS874003-02 Datasheet, PDF (1/14 Pages) Integrated Device Technology – PCI EXPRESS™ JITTER ATTENUATOR

PCI EXPRESS™ JITTER ATTENUATOR
ICS874003-02
GENERAL DESCRIPTION
The ICS874003-02 is a high performance Dif-
ICS
ferential-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
ICS874003-02 has a bandwidth of 400kHz. The 400kHz
provides an intermediate bandwidth that can easily track
triangular spread profiles, while providing good jitter
attenuation.
The ICS874003-02 uses IDT’s 3^rd Generation FemtoClock^TM
PLL technology to achive 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 and nCLK supports the following input types:
LVPECL, LVDS, LVHSTL, SSTL, HCSL
• Output frequency range: 98MHz - 320MHz
• Input frequency range: 98MHz - 128MHz
• VCO range: 490MHz - 640MHz
• Cycle-to-cycle jitter: 35ps (maximum)
• Supports PCI-Express Spread-Spectrum Clocking
• The 400kHz bandwidth mode allows the system designer to
make jitter attenuation/tracking skew design trade-offs
• 3.3V operating supply
• 0°C to 70°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
BLOCK DIAGRAM
OEA ^Pullup
F_SEL2:0 ^Pulldown
3
CLK ^Pulldown
nCLK ^Pullup
Phase
Detector
VCO
490 - 640MHz
F_SEL[2:0] FUNCTION TABLE
F_SEL2
0
1
0
1
0
1
0
1
Inputs
F_SEL1
0
0
1
1
0
0
1
1
F_SEL0
0
0
0
0
1
1
1
1
Outputs
QA0/nQA0, QA0/nQA0
÷2
÷5
÷4
÷2
÷2
÷5
÷4
÷4
QB0/nQB0
÷2
÷2
÷2
÷4
÷5
÷4
÷5
÷4
÷5
÷4
÷2 (default)
3
QA0
nQA0
QA1
nQA1
PIN ASSIGNMENT
QA1 ₁
VDDO 2
QA0 3
nQA0 4
MR 5
F_SEL0 6
nc 7
VDDA 8
F_SEL1 9
VDD 10
20 ^nQA1
19 VDDO
18 QB0
17 ^nQB0
16 F_SEL2
15 OEB
14 GND
13 nCLK
12 CLK
11 ^OEA
MR ^Pulldown
OEB ^Pullup
M = ÷5 (fixed)
÷5
÷4
÷2 (default)
QB0
ICS874003-02
20-Lead TSSOP
nQB0
6.5mm x 4.4mm x 0.92mm
package body
G Package
Top View
IDT^™ / ICS^™ PCI EXPRESS™ JITTER ATTENUATOR
1
ICS874003AG-02 REV A AUGUST 29, 2006