
FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER
ICS843001-21
IDT / ICS LVPECL FREQUENCY SYNTHESIZER
1
ICS843001AG-21 REV. AMARCH 15, 2007
Description
The ICS843001-21 is a a highly versatile, low
phase noise LVPECL Synthesizer which can
generate low jitter reference clocks for a variety of
communications applications and is a member of
the HiPerClocksTM family of high performance clock
solutions from IDT. The dual crystal interface allows the
synthesizer to support up to two communications standards in a
given application (i.e. 1GB Ethernet with a 25MHz crystal and 1Gb
Fibre Channel using a 26.5625MHz crystal). The rms phase jitter
performance is typically less than 1ps, thus making the device
acceptable for use in demanding applications such as OC48
SONET and 10Gb Ethernet. The ICS843001-21 is packaged in a
small 24-pin TSSOP package.
Features
One 3.3Vdifferential LVPECL output pair and
one LVCMOS/LVTTL single-ended reference clock output
Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
VCO range: 560MHz – 700MHz
Supports the following applications:
SONET, Ethernet, Fibre Channel, Serial ATA, and HDTV
Selectable ÷1 or ÷2 operation
RMS phase jitter @ 622.08MHz (12kHz - 20MHz):
0.80ps (typical)
Offset
Noise Power
100Hz ................ -60.3 dBc/Hz
1kHz .................. -88.5 dBc/Hz
10kHz ................ -111.9 dBc/Hz
100kHz .............. -113.0 dBc/Hz
Full 3.3V supply mode
0°C to 70°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
Block Diagram
HiPerClockS
ICS
11
10
01
00
01
10
Phase
Detector
VCO
000 ÷18
001 ÷22
010 ÷24
011 ÷25
100 ÷32 (default)
101 ÷40
N
000
÷1
001
÷2
010
÷3
011
÷4 (default)
100
÷5
101
÷6
110
÷8
111
÷10
M
3
OSC
Q0
REF_CLK
Q0
Pulldown
N2:N0
SEL0
SEL1
M2:M0
MR
TEST_CLK
XTAL_OUT1
XTAL_IN1
XTAL_OUT0
XTAL_IN0
OE_REF
Pin Assignment
ICS843001-21
24-Lead TSSOP
4.4mm x 7.8mm x 0.925mm
package body
G Package
Top View
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VCCO_CMOS
N0
N1
N2
VCCO_PECL
Q0
VEE
VCCA
VCC
XTAL_OUT1
XTAL_IN1
REF_CLK
VEE
M2
OE_REF
M0
M1
MR
SEL1
SEL0
TEST_CLK
XTAL_IN0
XTAL_OUT0