ICS8440258-46 Datasheet, PDF (1/16 Pages) Integrated Device Technology – FEMTOCLOCK™ CRYSTAL/LVCMOS-TOLVDS/LVCMOS FREQUENCY SYNTHESIZER

PRELIMINARY
FEMTOCLOCK™ CRYSTAL/LVCMOS-TO-
LVDS/LVCMOS FREQUENCY SYNTHESIZER
ICS8440258-46
GENERAL DESCRIPTION
The ICS8440258-46 is an 8 output synthesizer
ICS
optimized to generate Ethernet clocks and a
HiPerClockS™ _{member of the HiPerClock S ™family of high}
performance clock solutions from IDT. Using a
25MHz, 18pF parallel resonant crystal, the device
will generate both 125MHz and 25MHz clocks with mixed
LVDS and LVCMOS/LVTTL output logic. The ICS8440258-46
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 ICS8440258-46 is packaged
in a small, 5mm x 5mm VFQFN package.
FEATURES
• Four differential LVDS outputs at 125MHz
Two LVCMOS/LVTTL single-ended outputs at 125MHz
Two LVCMOS/LVTTL single-ended outputs at 25MHz
• Selectable crystal oscillator interface or LVCMOS/LVTTL
single-ended input
• VCO range: 490MHz - 680MHz
• RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.34ps (typical)
• Full 2.5V operating supply
• 0°C to 70°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS6)
packages
PIN ASSIGNMENT
BLOCK DIAGRAM
MR ^Pulldown
nPLL_SEL ^Pulldown
XTAL_IN
XTAL_OUT
25MHz
OSC ⁰
REF_CLK ^Pulldown
1
nXTAL_SEL ^Pulldown
1
÷5
Phase
VCO
Detector
490-680MHz
0
÷25
Q0
nQ0
GND
Q1
nQ1
VDD
Q2
nQ2
Q0
nQ0
Q1
nQ1
Q2
nQ2
Q3
nQ3
32 31 30 29 28 27 26 25
1
24
2
23
3 ICS8440258-46 22
4 ^{32-Lead VFQFN} 21
5 ^{5mm x 5mm x 0.925mm} 20
package body
6
K Package
19
7
Top View
18
8
17
9 10 11 12 13 14 15 16
nc
nc
nc
GND
Q7
VDDO2
Q6
GND
Q4
Q5
Q6
Q7
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
1
ICS8440258AK-46 REV B JANUARY 15, 2008