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ICS844008I-46

Description
FEMTOCLOCKS CRYSTAL-TO-LVDS CLOCK GENERATOR
File Size302KB,15 Pages
ManufacturerIDT (Integrated Device Technology, Inc.)
Websitehttp://www.idt.com/
Download Datasheet View All

ICS844008I-46 Overview

FEMTOCLOCKS CRYSTAL-TO-LVDS CLOCK GENERATOR

FEMTOCLOCKS™ CRYSTAL-TO-LVDS
CLOCK GENERATOR
ICS844008I-46
G
ENERAL
D
ESCRIPTION
The ICS844008I-46 is a 10Gb Ethernet Clock
Generator and a member of the HiPerClocks™ family
HiPerClockS™
of high perfor mance devices from IDT. The
ICS844008I-46 can synthesize 156.25MHz or
100MHz with a 25MHz crystal. It has a total of 8
LVDS outputs. The ICS844008I-46 has excellent phase jitter
performance and is packaged in a
32 Lead VFQFN package,
making it ideal for use in systems with limited board space.
F
EATURES
• Eight differential LVDS outputs
• Crystal oscillator interface designed for 18pF parallel resonant
crystals
• Supports the following output frequencies:
156.25MHz or 100MHz
• VCO frequency: 625MHz or 600MHz
• RMS phase jitter @ 156.25MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.45ps (typical)
• Full 2.5V supply mode
• -40°C to 85°C ambient operating temperature
• Available in lead-free (RoHS 6) packages
IC
S
F
REQUENCY
S
ELECT
F
UNCTION
T
ABLE
Input
XTAL Frequency
(MHz)
25
25
Output Frequency
(MHz)
156.25 (default)
100
FREQ_SEL
0
1
FB Divider
÷25
÷24
Output Divider
÷4
÷6
VCO (MHz)
625
60 0
B
LOCK
D
IAGRAM
OE
Pullup
25MHz
8
P
IN
A
SSIGNMENT
FREQ_SEL
XTAL_OUT
XTAL_IN
GND
V
DDA
V
DD
XTAL_IN
OSC
Phase
Detector
VCO
625MHz or
600MHz
÷4
or
÷6
Q0:Q7
nQ0:nQ7
nc
nc
8
XTAL_OUT
32 31 30 29 28 27 26 25
Q0
nQ0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
Q3
GND
V
DDO
nQ3
Q5
nQ4
nQ5
Q4
24
23
nc
OE
GND
nQ7
Q7
V
DDO
nQ6
Q6
FB =
÷
25 or
÷
24
GND
Q1
nQ1
V
DDO
Q2
nQ2
ICS844008I-46
22
FREQ_SEL
Pulldown
32-Lead VFQFN
21
5mm x 5mm x 0.925mm
20
package body
19
K Package
18
Top View
17
IDT
/ ICS
LVDS CLOCK GENERATOR
1
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