ICS843001I-23 Datasheet, PDF (1/24 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-3.3V LVPECL/LVCMOS FREQUENCY SYNTHESIZER

FemtoClock^® Crystal/LVCMOS-to-
ICS843001I-23
LVPECL/ LVCMOS Frequency Synthesizer
DATA SHEET
General Description
The ICS843001I-23 is a highly versatile, low phase noise
LVPECL/LVCMOS Synthesizer which can generate low jitter
reference clocks for a variety of communication applications. The
dual crystal interface allows the synthesizer to support up to three
communication standards in a given application (i.e. SONET with a
19.44MHz crystal, 1Gb/10Gb Ethernet and Fibre Channel using a
25MHz 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, GbE/10Gb Ethernet and SAN
applications. The ICS843001I-23 is packaged in a small 24-pin
TSSOP, E-Pad 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
• Crystal and CLK range: 19.44MHz – 27MHz
• Able to generate GbE/10GbE/12GbE, Fibre Channel
(1Gb/4Gb/10Gb), PCI-E and SATA from a 25MHz crystal
• VCO range: 1.12GHz – 1.275GHz
• Supports the following applications:
SONET, Ethernet, Fibre Channel, Serial ATA, and HDTV
• RMS phase jitter @ 622.08MHz (12kHz - 20MHz):
0.9ps (typical), 3.3V
• Supply modes
V_CC/V_CCO
3.3V/3.3V
3.3V/2.5V
2.5V/2.5V
• -40°C to 85°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
package
Block Diagram
3
N2:N0
SEL0 ^Pulldown
SEL1 ^Pulldown
XTAL_IN0
OSC
00
XTAL_OUT0
XTAL_IN1
OSC
01
XTAL_OUT1
CLK ^Pulldown
10
11
MR ^Pulldown
3
M2:M0 ^Pullup
11
Phase
Detector
10
VCO
01
00
M
000 ÷44
001 ÷45
010 ÷48
011 ÷50
100 ÷51
111 ÷64 (default)
N
000 ÷2
001 ÷4
010 ÷5
011 ÷6
100 ÷8 (default)
101 ÷10
110 ÷12
111 ÷16
OE_REF ^Pulldown
ICS843001CGI-23 REVISION A OCTOBER 4, 2011
1
Pin Assignment
V_{CCO_LVCMOS} 1
N0 2
24 REF_OUT
23 VEE
N1 3
N2 4
22 OE_REF
21 M2
VCCO_LVPECL 5
Q6
nQ 7
20 M1
19 M0
18 MR
V_EE 8
17 SEL1
VCCA 9
16 SEL0
VCC 10 15 CLK
Q
XTAL_OUT1 11 14 XTAL_IN0
XTAL_IN1 12 13 XTAL_OUT0
nQ
ICS843001I-23
24-Lead TSSOP, E-Pad
4.4mm x 7.8mm x 0.925mm
package body
G Package
Top View
REF_OUT
©2011 Integrated Device Technology, Inc.