Document Outline
- General Description
- Features
- Block Diagram
- Pin Assignment
- Pin Descriptions
- Pin Characteristics
- Absolute Maximum Ratings
- 3.3V Power Supply DC Characteristics
- 2.5V Power Supply DC Characteristics
- LVCMOS DC Characteristics
- Crystal Characteristics
- 3.3V AC Characteristics
- 3.3V/2.5V AC Characteristics
- 3.3V/1.8V AC Characteristics
- 2.5V AC Characteristics
- 2.5V/1.8V AC Characteristics
- Typical Phase Noise at 125MHz (3.3V)
- Parameter Measurement Information
- 3.3V Core/3.3V Output Load AC Test Circuit Diagram
- 3.3V Core/2.5V Output Load AC Test Circuit Diagram
- 3.3V Core/1.8V Output Load AC Test Circuit Diagram
- 2.5V Core/2.5V Output Load AC Test Circuit Diagram
- 2.5V Core/1.8V Output Load AC Test Circuit Diagram
- RMS Phase Jitter Diagram
- Output Skew Diagram
- Output Rise/Fall Time Diagram
- Output Duty Cycle/Pulse Width/Period Diagram
- Application Information
- Power Supply Filtering Techniques
- Crystal Input Interface
- Reliability Information
- Transistor Count
- Package Outline
- Package Dimensions
- Ordering Information
840008AR-01
www.icst.com/products/hiperclocks.html
REV. A APRIL 7, 2005
1
Integrated
Circuit
Systems, Inc.
ICS840008-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-LVCMOS/LVTTL
F
REQUENCY
S
YNTHESIZER
PRELIMINARY
G
ENERAL
D
ESCRIPTION
The ICS840008-01 is an 8 output LVCMOS/LVTTL
Synthesizer designed to generate 125MHz for
Gigabit Ethernet applications and is a member of
the HiPerClocks
TM
family of high performance clock
solutions from ICS. The ICS840008-01 uses ICS'
3rd generation low phase noise VCO technology and can achieve
1ps or lower typical random rms phase jitter, easily meeting
Gigabit Ethernet jitter requirements. The ICS840008-01 is
packaged in a small 24-pin SSOP package.
F
EATURES
Eight LVCMOS/LVTTL outputs, 15
typical output impedance
Output frequency range: 125MHz - 160MHz
Crystal oscillator interface, 25MHz - 32MHz crystal
VCO range: 500MHz - 640MHz
RMS phase jitter (1.875MHz - 20MHz): 0.52ps (typical)
Output skew: 150ps (maximum) (design target)
Voltages supply modes:
Core/Output
3.3V/3.3V
3.3V/2.5V
3.3V/1.8V
2.5V/2.5V
2.5V/1.8V
0C to 70C ambient operating temperature
Industrial temperature information available upon request
HiPerClockSTM
ICS
P
IN
A
SSIGNMENT
B
LOCK
D
IAGRAM
OSC
Phase
Detector
VCO
500MHz -
640MHz
20
(fixed)
4
(fixed)
1
0
8
8
25MHz
ICS840008-01
24-Lead SSOP, 150MIL
3.9mm x 8.65mm x 1.5mm
package body
R Package
Top View
V
DDO
nc
XTAL_OUT
XTAL_IN
V
DDA
OE
MR
nPLL_SEL
V
DD
nc
GND
nc
1
2
3
4
5
6
7
8
9
10
11
12
Q0
Q1
GND
Q2
Q3
V
DDO
Q4
Q5
GND
Q6
Q7
V
DDO
24
23
22
21
20
19
18
17
16
15
14
13
nPLL_SEL
XTAL_IN
XTAL_OUT
MR
OE
Q0:Q7
Pulldown
Pulldown
Pullup
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.
840001AR-01
www.icst.com/products/hiperclocks.html
REV. A APRIL 7, 2005
2
Integrated
Circuit
Systems, Inc.
ICS840008-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-LVCMOS/LVTTL
F
REQUENCY
S
YNTHESIZER
PRELIMINARY
T
ABLE
1. P
IN
D
ESCRIPTIONS
T
ABLE
2. P
IN
C
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840008AR-01
www.icst.com/products/hiperclocks.html
REV. A APRIL 7, 2005
3
Integrated
Circuit
Systems, Inc.
ICS840008-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-LVCMOS/LVTTL
F
REQUENCY
S
YNTHESIZER
PRELIMINARY
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
DD
4.6V
Inputs, V
I
-0.5V to V
DD
+ 0.5 V
Outputs, V
O
-0.5V to V
DD
+ 0.5V
Package Thermal Impedance,
JA
73.1C/W (0 mps)
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
= 3.3V10%, V
DDO
= 3.3V10%
OR
2.5V5%
OR
1.8V5%,
T
A
= 0C
TO
70C
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S
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DC C
HARACTERISTICS
,
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OR
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TO
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840001AR-01
www.icst.com/products/hiperclocks.html
REV. A APRIL 7, 2005
4
Integrated
Circuit
Systems, Inc.
ICS840008-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-LVCMOS/LVTTL
F
REQUENCY
S
YNTHESIZER
PRELIMINARY
T
ABLE
4. C
RYSTAL
C
HARACTERISTICS
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HARACTERISTICS
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%
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2
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2
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3
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2
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2
/
840008AR-01
www.icst.com/products/hiperclocks.html
REV. A APRIL 7, 2005
5
Integrated
Circuit
Systems, Inc.
ICS840008-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-LVCMOS/LVTTL
F
REQUENCY
S
YNTHESIZER
PRELIMINARY
T
ABLE
5A. AC C
HARACTERISTICS
,
V
DD
= V
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= V
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5C. AC C
HARACTERISTICS
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:
3
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840001AR-01
www.icst.com/products/hiperclocks.html
REV. A APRIL 7, 2005
6
Integrated
Circuit
Systems, Inc.
ICS840008-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-LVCMOS/LVTTL
F
REQUENCY
S
YNTHESIZER
PRELIMINARY
T
ABLE
5D. AC C
HARACTERISTICS
,
V
DD
= V
DDA
= V
DDO
= 2.5V5%, T
A
= 0C
TO
70C
T
ABLE
5E. AC C
HARACTERISTICS
,
V
DD
= V
DDA
= 2.5V5%, V
DDO
= 1.8V5%, T
A
= 0C
TO
70C
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840008AR-01
www.icst.com/products/hiperclocks.html
REV. A APRIL 7, 2005
7
Integrated
Circuit
Systems, Inc.
ICS840008-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-LVCMOS/LVTTL
F
REQUENCY
S
YNTHESIZER
PRELIMINARY
T
YPICAL
P
HASE
N
OISE
AT
125MH
Z
(3.3V)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
1k
10k
100k
1M
10M
100M
125MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.52ps (typical)
O
FFSET
F
REQUENCY
(H
Z
)
N
OISE
P
O
WER
dBc
Hz
Phase Noise Result by adding
Gigabit Ethernet Filter to raw data
Raw Phase Noise Data
Gigabit Ethernet Filter
840001AR-01
www.icst.com/products/hiperclocks.html
REV. A APRIL 7, 2005
8
Integrated
Circuit
Systems, Inc.
ICS840008-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-LVCMOS/LVTTL
F
REQUENCY
S
YNTHESIZER
PRELIMINARY
P
ARAMETER
M
EASUREMENT
I
NFORMATION
Phase Noise Mask
Offset Frequency
f
1
f
2
Phase Noise Plot
RMS Jitter = Area Under the Masked Phase Noise Plot
Noise P
o
w
er
SCOPE
Qx
LVCMOS
3.3V C
ORE
/1.8V O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
2.4V12%
V
DDO
-0.9V5%
V
DD
,
V
DDA
,
0.9V5%
SCOPE
Qx
LVCMOS
3.3V C
ORE
/2.5V O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
2.05V13%
V
DDO
-1.25V5%
V
DD
,
V
DDA
,
1.25V5%
3.3V C
ORE
/3.3V O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
SCOPE
Qx
LVCMOS
1.65V10%
-1.65V10%
2.5V C
ORE
/2.5V O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
2.5 C
ORE
/1.8V O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
RMS P
HASE
J
ITTER
SCOPE
Qx
LVCMOS
1.6V5%
V
DDO
-0.9V5%
V
DD
,
V
DDA
,
0.9V5%
V
DD
,
V
DDA
,
V
DDO
GND
GND
GND
GND
SCOPE
Qx
LVCMOS
1.25V5%
-1.25V5%
V
DD
,
V
DDA
,
V
DDO
GND
840008AR-01
www.icst.com/products/hiperclocks.html
REV. A APRIL 7, 2005
9
Integrated
Circuit
Systems, Inc.
ICS840008-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-LVCMOS/LVTTL
F
REQUENCY
S
YNTHESIZER
PRELIMINARY
Pulse Width
t
PERIOD
t
PW
t
PERIOD
odc =
V
DDO
2
Q0:Q7
O
UTPUT
D
UTY
C
YCLE
/P
ULSE
W
IDTH
/P
ERIOD
O
UTPUT
S
KEW
Clock
Outputs
20%
80%
80%
20%
t
R
t
F
tsk(o)
V
DDO
2
V
DDO
2
Qx
Qy
O
UTPUT
R
ISE
/F
ALL
T
IME
840001AR-01
www.icst.com/products/hiperclocks.html
REV. A APRIL 7, 2005
10
Integrated
Circuit
Systems, Inc.
ICS840008-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-LVCMOS/LVTTL
F
REQUENCY
S
YNTHESIZER
PRELIMINARY
A
PPLICATION
I
NFORMATION
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS840008-01 provides
separate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
DD
, V
DDA
, and V
DDO
should be individually connected to the power supply
plane through vias, and bypass capacitors should be
used for each pin. To achieve optimum jitter performance,
power supply isolation is required.
Figure 1 illustrates how
a 10
resistor along with a 10F and a .01F bypass
capacitor should be connected to each V
DDA
.
P
OWER
S
UPPLY
F
ILTERING
T
ECHNIQUES
F
IGURE
1. P
OWER
S
UPPLY
F
ILTERING
10
V
DDA
10
F
.01
F
3.3V
.01
F
V
DD
C
RYSTAL
I
NPUT
I
NTERFACE
The ICS840008-01 has been characterized with 18pF paral-
lel resonant crystals. The capacitor values shown in
Figure 2
Figure 2. C
RYSTAL
I
NPU
t I
NTERFACE
below were determined using a 25MHz 18pF parallel reso-
nant crystal and were chosen to minimize the ppm error.
ICS84332
XTAL_IN
XTAL_OUT
X1
18pF Parallel Cry stal
C2
22p
C1
22p
ICS840008-01
840008AR-01
www.icst.com/products/hiperclocks.html
REV. A APRIL 7, 2005
11
Integrated
Circuit
Systems, Inc.
ICS840008-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-LVCMOS/LVTTL
F
REQUENCY
S
YNTHESIZER
PRELIMINARY
R
ELIABILITY
I
NFORMATION
T
RANSISTOR
C
OUNT
The transistor count for ICS840008-01 is: 3378
T
ABLE
7.
JA
VS
. A
IR
F
LOW
T
ABLE
FOR
24 L
EAD
SSOP
JA
by Velocity (Meters per Second)
0
1
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
73.1C/W
65.9C/W
60.5C/W
840001AR-01
www.icst.com/products/hiperclocks.html
REV. A APRIL 7, 2005
12
Integrated
Circuit
Systems, Inc.
ICS840008-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-LVCMOS/LVTTL
F
REQUENCY
S
YNTHESIZER
PRELIMINARY
P
ACKAGE
O
UTLINE
- R S
UFFIX
FOR
24 L
EAD
SSOP
T
ABLE
8. P
ACKAGE
D
IMENSIONS
Reference Document: JEDEC Publication 95, MO-137
L
O
B
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Y
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4
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5
3
.
1
5
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.
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2
.
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D
Z
F
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R
4
8
.
0
840008AR-01
www.icst.com/products/hiperclocks.html
REV. A APRIL 7, 2005
13
Integrated
Circuit
Systems, Inc.
ICS840008-01
F
EMTO
C
LOCKS
TM C
RYSTAL
-
TO
-LVCMOS/LVTTL
F
REQUENCY
S
YNTHESIZER
PRELIMINARY
T
ABLE
9. O
RDERING
I
NFORMATION
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) assumes no responsibility for either its use or
for infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal
commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recom-
mended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use
in life support devices or critical medical instruments.
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The aforementioned trademarks, HiPerClockSTM and FemtoClocksTM are a trademark of Integrated Circuit Systems, Inc. or its subsidiaries in the United States and/or other countries.
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