PRELIMINARY
VCXO JITTER ATTENUATOR &
FEMTOCLOCK™ MULTIPLIER
ICS813322-02
GENERAL DESCRIPTION
FEATURES
• Two differential LVPECL outputs
The ICS813322-02 is
a member of the
Each output supports independent frequency selection at
19.44MHz, 77.76MHz, 155.52MHz and 622.08MHz
ICS
HiperClockS™family of high performance clock
solutions from IDT. The ICS813322-02 is a PLL
based synchronous multiplier that is optimized for
Ethernet or SONET-to-SONET clock jitter atten-
HiPerClockS™
• Two differential inputs support the following input types:
LVPECL, LVDS, HCSL
uation and frequency translation. The device contains two
internal frequency multiplication stages that are cascaded in
series.The first stage is a VCXO PLL that is optimized to provide
reference clock jitter attenuation. The second stage is a
FemtoClock™ frequency multiplier that provides the low jitter,
high frequency SONET output clock that meets up to SONET
OC-48 jitter requirements. Pre-divider and output divider
multiplication ratios are selected using device selection
control pins. The multiplication ratios are optimized to support
most common clock rates used in Ethernet and SONET
applications. The VCXO requires the use of an external,
inexpensive pullable crystal. The VCXO uses external passive
loop filter components which allows configuration of the PLL
loop bandwidth and damping characteristics. The device is
packaged in a space-saving 32-VFQFN package.
• Accepts input frequencies from 8kHz to 156.25MHz including
8kHz,19.44MHz, 25MHz, 62.5MHZ, 77.76MHz, 125MHz,
155.52MHz and 156.25MHz
• Each output has independently controlled dividers for
common SONET clock rates
• Attenuates the phase jitter of the input clock by using a low-
cost pullable funamental mode VCXO crystal
• VCXO PLL bandwidth can be optimized for jitter attenuation
and reference tracking using external loop filter connection
• FemtoClock frequency multiplier provides low jitter, high
frequency output
• Absolute pull range: 50ppm
• FemtoClock VCO frequency: 622.08MHz
• RMS phase jitter @ 155.52MHz, using a 19.44MHz crystal
(12kHz – 20MHz): 1.16ps (typical)
PIN ASSIGNMENT
• 3.3V supply voltage
• 0°C to 70°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
32 31 30 29 28 27 26 25
LF1
LF0
1
2
3
4
5
6
7
8
VEE
24
23
22
21
20
19
18
17
nQB
QB
ISET
VEE
VCCO
nQA
QA
ICS813322-02
CLK_SEL
VCC
nc
VEE
VEE
ODASEL_0
9 10 11 12 13 14 15 16
32-Lead VFQFN
5mm x 5mm x 0.925mm package body
K Package
Top View
The Preliminary Information presented herein represents a product in pre-production.The noted characteristics are based on initial product characterization
and/or qualification.Integrated DeviceTechnology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT™ / ICS™ VCXO JITTER ATTENUATOR/MULTIPLIER
1
ICS813322BK-02 REV. B AUGUST 14, 2008