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844008AY-16LF

Description
IC clock gen 8lvds 32ptqfp
Categorysemiconductor    Analog mixed-signal IC   
File Size133KB,12 Pages
ManufacturerIDT (Integrated Device Technology, Inc.)
Websitehttp://www.idt.com/
Environmental Compliance  
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844008AY-16LF Overview

IC clock gen 8lvds 32ptqfp

PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS844008-16
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
LVDS F
REQUENCY
S
YNTHESIZER
F
EATURES
• Eight LVDS outputs
• Crystal oscillator interface
• Supports the following output frequencies:
100MHz or 125MHz
• VCO: 500MHz
• RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.44ps (typical)
• Full 3.3V supply modes
• 0°C to 70°C ambient operating temperature
• Available in both standard and lead-free RoHS compliant
packages
G
ENERAL
D
ESCRIPTION
The ICS844008-16 is an 8 output LVDS
Synthesizer optimized to generate PCI Express
HiPerClockS™
reference clock frequencies and is a member
of the HiPerClocks
TM
family of high performance
clock solutions from ICS. Using a 25MHz
parallel resonant crystal, the following frequencies can be
generated based on F_SEL pin: 100MHz or 125MHz. The
ICS844008-16 uses ICS’ 3
rd
generation low phase noise
VCO technology and can achieve <1ps typical rms phase
jitter, easily meeting PCI Express jitter requirements. The
ICS844008-16 is packaged in a 32-pin LQFP package.
IC
S
F
REQUENCY
S
ELECT
F
UNCTION
T
ABLE
Input
Input
Frequency
(MHz)
25MHz
25MHz
M Divider
Value
20
20
N Divider
Value
4
5
M/N Divider
Value
5
4
Output
Frequency
(MHz)
12 5
100
P
IN
A
SSIGNMENT
XTAL_OUT
nPLL_SEL
XTAL_IN
V
DDA
GND
OE1
OE2
V
DD
F_SEL
0
1
32 31 30 29 28 27 26 25
Q0
nQ0
V
DD
Q1
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
F_SEL
Q3
nQ3
V
DD
GND
Q4
nQ4
MR
24
Q7
nQ7
V
DD
Q6
nQ6
GND
Q5
nQ5
ICS844008-16
32-Lead LQFP
7mm x 7mm x 1.4mm
package body
Y Package
Top View
23
22
21
20
19
18
17
B
LOCK
D
IAGRAM
nPLL_SEL
Pulldown
nQ1
Q0
nQ0
Q1
GND
Q2
nQ2
1
XTAL_IN
25MHz
nQ1
Q2
OSC
XTAL_OUT
Phase
Detector
VCO
500MHz
(w/25MHz
Reference)
0
÷4
÷5
nQ2
Q3
nQ3
M =
÷
20 (fixed)
OE1
Pullup
Q4
nQ4
Q5
nQ5
Q6
nQ6
Q7
MR
Pulldown
F_SEL
OE2
Pullup
Pullup
nQ7
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.
844008AY
-16
www.icst.com/products/hiperclocks.html
REV. A FEBRUARY 1, 2006
1

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