
DATA SHEET
ICS843001AGI-22 REVISION B JUNE 25, 2009
1
2009 Integrated Device Technology, Inc.
FemtoClock Crystal/LVCMOS-to-3.3V,
2.5V LVPECL Frequency Synthesizer
ICS843001I-22
General Description
The ICS843001I-22 is a a highly versatile, low
phase noise LVPECL/LVCMOS 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 communication 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 ICS843001I-22 is packaged in a small 24-pin TSSOP package.
Control Input Function Table
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: 490MHz – 640MHz
Output frequency range: 49MHz – 640MHz
Supports the following applications:
SONET, Ethernet, Fibre Channel, Serial ATA, and HDTV
RMS phase jitter @ 125MHz (1.875MHz - 20MHz):
0.50ps (typical)
Full 3.3V or 2.5V supply mode
-40°C to 85°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
package
Input
Outputs
OE
Q/nQ
REF_OUT
0
High-Impedance
1
High-Impedance
Active
FLOAT
Active
High-Impedance
HiPerClockS
ICS
Pin Assignment
11
10
01
00
01
10
Phase
Detector
VCO
490MHz-640MHz
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
Q
REF_CLK
nQ
Pulldown
Pullup/Pulldown
N2:N0
SEL0
SEL1
M2:M0
MR
CLK
XTAL_OUT1
XTAL_IN1
XTAL_OUT0
XTAL_IN0
OE
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_LVCMOS
N0
N1
N2
VCCO_LVPECL
Q
nQ
VEE
VCCA
VCC
XTAL_OUT1
XTAL_IN1
REF_OUT
VEE
M2
OE
M0
M1
MR
SEL1
SEL0
CLK
XTAL_IN0
XTAL_OUT0
ICS843001I-22
24-Lead TSSOP
4.4mm x 7.8mm x 0.925mm
package body
G Package
Top View
Block Diagram