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ICS843020A01

Description
FEMTOCLOCKS-TM 680MHZ, CRYSTAL-TO- 3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
File Size208KB,20 Pages
ManufacturerICS ( IDT )
Websitehttp://www.icst.com
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ICS843020A01 Overview

FEMTOCLOCKS-TM 680MHZ, CRYSTAL-TO- 3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS843020-01
F
EMTO
C
LOCKS
™ 680MH
Z
, C
RYSTAL
-
TO
-
3.3V D
IFFERENTIAL
LVPECL F
REQUENCY
S
YNTHESIZER
F
EATURES
Dual differential 3.3V LVPECL outputs
Selectable crystal oscillator interface
or LVCMOS/LVTTL TEST_CLK
Output frequency range: 70MHz to 680MHz
Crystal input frequency range: 12MHz to 32MHz
VCO range: 560MHz to 680MHz
Parallel or serial interface for programming feedback
and output dividers
Input P_DIV under parallel load control
RMS phase jitter at 156.25MHz (1.875MHz to 20MHz):
0.49ps (typical), P_DIV =
÷1
3.3V supply voltage
0°C to 70°C ambient operating temperature
Lead-Free package fully RoHS compliant
G
ENERAL
D
ESCRIPTION
The ICS843020-01 is a general purpose, dual out-
put Crystal-to-3.3V Differential LVPECL High Fre-
HiPerClockS™
quency Synthesizer and a member of the
FemtoClocks™ family of High Performance Clock
Solutions from ICS. The ICS843020-01 is based
rd
on ICS’ 3 generation VCO technology and is capable of sub-
1ps RMS Phase Jitter performance, making it ideal for use in
10 Gigabit Ethernet, 10 Gigabit Fibre Channel, SONET and
Serial ATA applications.
ICS
The ICS843020-01 is a highly flexible programmable synthe-
sizer capable of generating output frequencies over a range of
70MHz to 680MHz. The output frequency can be programmed
in small step sizes as low as 250kHz when using a 16MHz
crystal,
÷8
input divider, and output divider =
÷8.
B
LOCK
D
IAGRAM
VCO_SEL
XTAL_SEL
TEST_CLK
XTAL_IN
OSC
XTAL_OUT
P_DIV
÷
P
0
÷8
Float
÷1
(default)
1
÷4
1
0
P
IN
A
SSIGNMENT
VCO_SEL
nP_LOAD
XTAL_IN
32 31 30 29 28 27 26 25
M5
M6
M7
M8
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
TEST
V
CC
FOUT1
nFOUT1
V
CCO
FOUT0
nFOUT0
V
EE
M4
PLL
PHASE DETECTOR
MR
÷
M
VCO
0
1
÷
N
÷
1
÷
2
÷
4
÷
8
N0
N1
P_DIV
FOUT0
nFOUT0
FOUT1
nFOUT1
V
EE
ICS843020-01
M3
M2
M1
M0
24
23
22
21
20
19
18
17
XTAL_OUT
TEST_CLK
XTAL_SEL
V
CCA
S_LOAD
S_DATA
S_CLOCK
MR
S_LOAD
S_DATA
S_CLOCK
nP_LOAD
M0:M8
N0:N1
CONFIGURATION
INTERFACE
LOGIC
TEST
32-Lead LQFP
7mm x 7mm x 1.4mm package body
Y Package
Top View
843020AY-01
www.icst.com/products/hiperclocks.html
1
REV. B APRIL 14, 2005

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