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ICS8421002AGI-01LFT

Description
FEMTOCLOCKS⑩ CRYSTAL-TO-HSTL FREQUENCY SYNTHESIZER
File Size190KB,13 Pages
ManufacturerICS ( IDT )
Websitehttp://www.icst.com
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ICS8421002AGI-01LFT Overview

FEMTOCLOCKS⑩ CRYSTAL-TO-HSTL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS8421002I-01
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
HSTL F
REQUENCY
S
YNTHESIZER
F
EATURES
• Two HSTL outputs (VOHmax = 1.5V)
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• Supports the following output frequencies: 156.25MHz,
125MHz, 62.5MHz
• VCO range: 560MHz - 680MHz
• RMS phase jitter @ 156.25MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.44ps (typical)
• Power supply modes:
Core/Output
3.3V/1.8V
2.5V/1.8V
• -40°C to 85°C ambient operating temperature
• Available in both standard and lead-free RoHS compliant
packages
G
ENERAL
D
ESCRIPTION
The ICS8421002I-01 is a 2 output HSTL
Synthesizer optimized to generate Ethernet
HiPerClockS™
reference clock frequencies and is a member of
the HiPerClocks
TM
family of high performance
clock solutions from ICS. Using a 25MHz,
18pF parallel resonant crystal, the following frequencies
can be generated based on the 2 frequency select pins
(F_SEL[1:0]): 156.25MHz, 125MHz and 62.5MHz. The
ICS8421002I-01 uses ICS’ 3
rd
generation low phase
noise VCO technology and can achieve 1ps or lower typi-
cal r ms phase jitter, easily meeting Ether net jitter
requirements. The ICS8421002I-01 is packaged in a small
20-pin TSSOP package.
IC
S
F
REQUENCY
S
ELECT
F
UNCTION
T
ABLE
M Divider
Value
25
25
25
not used
N Divider
Value
4
5
10
Output Frequency
(25MHz Ref.)
156.25
125
62.5
not used
P
IN
A
SSIGNMENT
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
F_SEL1 F_SEL0
0
0
1
1
0
1
0
1
ICS8421002I-01
B
LOCK
D
IAGRAM
F_SEL[1:0]
Pulldown
nPLL_SEL
Pulldown
REF_CLK
Pulldown
25MHz
2
20-Lead TSSOP
6.5mm x 4.4mm x 0.92mm
package body
G Package
Top View
Q0
F_SEL[1:0]
0 0 ÷4
(default)
1
01
10
11
÷5
÷10
Not Used
1
nQ0
XTAL_IN
OSC
XTAL_OUT
nXTAL_SEL
Pulldown
0
Phase
Detector
VCO
Q1
nQ1
0
M = 25 (fixed)
MR
Pulldown
8421002AGI-01
www.icst.com/products/hiperclocks.html
1
REV. A FEBRUARY 6, 2006

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