844002AGI
www.icst.com/products/hiperclocks.html
REV. A JANUARY 16, 2006
1
Integrated
Circuit
Systems, Inc.
ICS844002I
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-
LVDS F
REQUENCY
S
YNTHESIZER
PRELIMINARY
G
ENERAL
D
ESCRIPTION
The ICS844002I is a 2 output LVDS Synthesizer
optimized to generate Fibre Channel reference
clock frequencies and is a member of the
HiPerClocks
TM
family of high performance clock
solutions from ICS. Using a 26.5625MHz 18pF
parallel resonant crystal, the following frequencies can be
generated based on the 2 frequency select pins (F_SEL[1:0]):
212.5MHz, 187.5MHz, 159.375MHz, 106.25MHz and
53.125MHz. The ICS844002I uses ICS' 3
rd
generation
low phase noise VCO technology and can achieve <1ps
typical rms phase jitter, easily meeting Fibre Channel jitter
requirements. The ICS844002I is packaged in a small 20-pin
TSSOP package.
F
EATURES
Two LVDS outputs
Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
Supports the following output frequencies: 212.5MHz,
187.5MHz, 159.375MHz, 106.25MHz and 53.125MHz
VCO range: 560MHz - 680MHz
RMS phase jitter @ 212.5MHz, using a 26.5625MHz crystal
(637kHz - 10MHz): 0.65ps (typical)
Full 3.3V or 2.5V supply modes
-40C to 85C ambient operating temperature
Available in both standard and lead-free RoHS compliant
packages
HiPerClockSTM
ICS
1
1
0
1
0
Phase
Detector
VCO
637.5MHz
(w/26.5625MHz
Reference)
M = 24 (fixed)
F_SEL[1:0]
0 0 3
0 1 4
1 0 6
1 1 12
2
OSC
B
LOCK
D
IAGRAM
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F
REQUENCY
S
ELECT
F
UNCTION
T
ABLE
F_SEL[1:0]
nPLL_SEL
REF_CLK
XTAL_IN
XTAL_OUT
nXTAL_SEL
MR
Q0
nQ0
Q1
nQ1
Pulldown
Pulldown
26.5625MHz
Pulldown
Pulldown
Pulldown
ICS844002I
20-Lead TSSOP
6.5mm x 4.4mm x 0.92mm
package body
G Package
Top View
nc
V
DDO
Q0
nQ0
MR
nPLL_SEL
nc
V
DDA
F_SEL0
V
DD
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
DDO
Q1
nQ1
GND
V
DD
nXTAL_SEL
REF_CLK
XTAL_IN
XTAL_OUT
F_SEL1
P
IN
A
SSIGNMENT
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
844002AGI
www.icst.com/products/hiperclocks.html
REV. A JANUARY 16, 2006
3
Integrated
Circuit
Systems, Inc.
ICS844002I
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-
LVDS F
REQUENCY
S
YNTHESIZER
PRELIMINARY
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A
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
DD
4.6V
Inputs, V
I
-0.5V to V
DD
+ 0.5V
Outputs, I
O
Continuous Current
10mA
Surge Current
15mA
Package Thermal Impedance,
JA
73.2C/W (0 lfpm)
Storage Temperature, T
STG
-65C to 150C
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent damage to the
device. These ratings are stress specifications only. Functional
operation of product at these conditions or any conditions be-
yond those listed in the
DC Characteristics
or
AC Character-
istics
is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect product reliability.
T
ABLE
3A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
DD
= V
DDA
= V
DDO
= 3.3V5%, TA = -40C
TO
85C
T
ABLE
3C. LVCMOS / LVTTL DC C
HARACTERISTICS
,
V
DD
= V
DDA
= V
DDO
= 3.3V5%
OR
2.5V5%, TA = -40C
TO
85C
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S
UPPLY
DC C
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= V
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= V
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TO
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