optimized to generate Gigabit and 10 Gigabit Ether-
HiPerClockS™
net clocks and is a member of the HiPerClockS™
family of high performance clock solutions from IDT.
Using a 25MHz, 18pF parallel resonant crystal, the
device will generate 125MHz and 3.90625MHz clocks with mix-
ed LVDS and LVCMOS/LVTTL output levels. The ICS8440259-05
uses IDT’s 3
rd
generations low phase noise VCO technology and
can achieve <1ps typical rms phase jitter, easily meeting Ethernet
jitter requirements. The ICS8440259-05 is packaged in a small,
32-pin VFQFN package that is optimum for applications with
space limitations.
F
EATURES
•
Five differential LVDS outputs at 125MHz
Three LVCMOS/LVTTL single-ended outputs at 125MHz
One LVCMOS/LVTTL single-ended output at 3.90625MHz
•
Selectable crystal oscillator interface or LVCMOS/LVTTL
single-ended input and PLL bypass from a single select pin
•
VCO range: 490MHz - 680MHz
•
RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.43ps (typical)
•
Full 3.3V supply mode
•
0°C to 70°C ambient operating temperature
•
Available in both standard (RoHS 5) and lead-free (RoHS6)
packages
IC
S
B
LOCK
D
IAGRAM
nPLL_BYPASS
Pullup
REF_CLK
Pulldown
25MHz
0
0
Q0
nQ0
Q1
nQ1
Q2
XTAL_IN
Phase
Detector
1
VCO
490-680MHz
÷5
1
OSC
XTAL_OUT
P
IN
A
SSIGNMENT
XTAL_OUT
REF_CLK
XTAL_IN
GND
V
DD
nc
32 31 30 29 28 27 26 25
Q4
Q0
nQ0
GND
Q1
nQ1
V
DDO
_
LVDS
Q2
nQ2
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
V
DDO
_
LVDS
GND
nQ4
GND
nQ3
V
DD
Q3
Q4
ICS8440259-05
32-Lead VFQFN
5mm x 5mm x 0.75mm
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 Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT
™
/ ICS
™
LVDS/LVCMOS FREQUENCY SYNTHESIZER
nPLL_BYPASS
÷25
V
DDA
nQ2
Q3
nQ3
24
23
22
21
20
19
18
17
Q8
V
DDO
_
LVCMOS
Q7
GND
Q6
V
DDO
_
LVCMOS
Q5
GND
Q7
Q6
Q5
nQ4
÷32
Q8
1
ICS8440259AK-05 REV. C JUNE 5, 2007
ICS8440259-05
FEMTOCLOCK™ CRYSTAL/LVCMOS-TO-LVDS/ LVCMOS FREQUENCY SYNTHESIZER
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