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ICS844252AG-04T

Description
FEMTOCLOCKS⑩ CRYSTAL-TO-LVDS CLOCK GENERATOR
File Size156KB,12 Pages
ManufacturerICS ( IDT )
Websitehttp://www.icst.com
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ICS844252AG-04T Overview

FEMTOCLOCKS⑩ CRYSTAL-TO-LVDS CLOCK GENERATOR

PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS844252-04
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
LVDS C
LOCK
G
ENERATOR
G
ENERAL
D
ESCRIPTION
The ICS844252-04 is a 10Gb/12Gb Ethernet
Clock Generator and a member of the
HiPerClockS™
HiPerClocks
TM
family of high perfor mance
devices from ICS. The ICS844252-04 can
synthesize 10 Gigabit Ethernet and 12 Gigabit
Ethernet with a 25MHz crystal. It can also generate SATA
and 10Gb Fibre Channel reference clock frequencies with
the appropriate choice of crystals. The ICS844252-04 has
excellent phase jitter performance and is packaged in a
small 16-pin TSSOP, making it ideal for use in systems with
limited board space.
F
EATURES
Two differential LVDS outputs
Crystal oscillator interface designed for
18pF parallel resonant crystals
Crystal input frequency range: 19.33MHz - 30MHz
Output frequency range: 145MHz - 187.5MHz
VCO frequency range: 580MHz - 750MHz
RMS phase jitter at 156.25MHz (1.875MHz - 20MHz):
0.36ps (typical)
3.3V operating supply
0°C to 70°C ambient operating temperature
Industrial temperature information available upon request
Available in both standard and lead-free compliant
packages
IC
S
C
ONFIGURATION
T
ABLE
Crystal Frequency
(MHz)
25
25
WITH
25MH
Z
C
RYSTAL
N Output Divide
4
4
Output Frequency
(MHz)
187.5
156.25
Application
12 Gigabit Ethernet
10 Gigabit Ethernet
Inputs
Feedback VCO Frequency
Divide
(MHz)
30
750
25
WITH
625
C
ONFIGURATION
T
ABLE
Crystal Frequency
(MHz)
20
21.25
24
25.5
30
S
ELECTABLE
C
RYSTALS
N Output Divide
4
4
4
4
4
Output Frequency
(MHz)
150
159.375
150
159.375
187.5
Application
SATA
10 Gigabit Fibre Channel
SATA
10 Gigabit Fibre Channel
12 Gigabit Ethernet
Inputs
Feedback VCO Frequency
Divide
(MHz)
30
600
30
25
25
25
637.5
60 0
637.5
750
B
LOCK
D
IAGRAM
OE
nPLL_SEL
REF_CLK
Pullup
Pulldown
P
IN
A
SSIGNMENT
D
Q
LE
nQ1
Q1
V
DDO
OE
nPLL_SEL
V
DDO
Q0
nQ0
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
XTAL_IN
XTAL_OUT
GND
REF_CLK
CLK_SEL
V
DD
V
DDA
FREQ_SEL
Pulldown
1
1
XTAL_IN
OSC
XTAL_OUT
CLK_SEL
Pulldown
0
Phase
Detector
VCO
580MHz-750MHz
DIV. N
÷4
0
Q0
nQ0
Q1
nQ1
ICS844252-04
16-Lead TSSOP
4.4mm x 5.0mm x 0.92mm
package body
G Package
Top View
0 = ÷25
(default)
1 = ÷30
FREQ_SEL
Pulldown
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.
844252AG-04
www.icst.com/products/hiperclocks.html
REV. A JANUARY 26, 2006
1

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