PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS843252-04
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
3.3V LVPECL C
LOCK
G
ENERATOR
F
EATURES
•
Two differential 3.3V LVPECL output
•
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):
0.39ps (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
G
ENERAL
D
ESCRIPTION
The ICS843252-04 is a 10Gb/12Gb Ethernet
Clock Generator and a member of the
HiPerClockS™
HiPerClocks
TM
family of high perfor mance
devices from ICS. The ICS843252-04 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 ICS843252-04 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.
IC
S
C
ONFIGURATION
T
ABLE
Crystal Frequency
(MHz)
25
25
WITH
25MH
Z
C
RYSTAL
Inputs
Feedback VCO Frequency
Divide
(MHz)
30
750
25
WITH
N Output Divide
4
4
Output Frequency
(MHz)
187.5
156.25
Application
12 Gigabit Ethernet
10 Gigabit Ethernet
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
CCO
OE
nPLL_SEL
V
CCO
Q0
nQ0
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
XTAL_IN
XTAL_OUT
V
EE
REF_CLK
CLK_SEL
V
CC
V
CCA
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
ICS843252-04
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.
843252AG-04
www.icst.com/products/hiperclocks.html
REV. A JANUARY 25, 2006
1
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS843252-04
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
3.3V LVPECL C
LOCK
G
ENERATOR
Type
Description
Differential clock outputs. LVPECL interface levels.
Output supply pins.
Output enable. When HIGH, clock outputs follow clock input.
When LOW, Qx outputs are forced low, nQx outputs are forced high.
Pullup
LVCMOS/LVTTL interface levels.
Selects between the PLL and reference clock as input to the divider.
Pulldown When Low, selects PLL. When High, selects reference clock.
LVCMOS/LVTTL interface levels.
Differential clock outputs. LVPECL interface levels.
Pulldown Frequency select pin. LVCMOS/LVTTL interface levels.
Analog supply pin.
Core supply pin.
Pulldown
Clock select input. When Low, selects cr ystal inputs. When High,
selects REF_CLK. LVCMOS/LVTTL interface levels.
Pulldown Reference clock input. LVCMOS/LVTTL interface levels.
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1, 2
3, 6
4
Name
nQ1, Q1
V
CCO
OE
Power
Input
Output
5
7, 8
9
10
11
12
13
14
nPLL_SEL
Q0, nQ0
FREQ_SEL
V
CCA
V
CC
CLK_SEL
REF_CLK
Input
Output
Input
Power
Power
Input
Input
V
EE
Power
Negative supply pin.
Cr ystal oscillator interface. XTAL_IN is the input,
XTAL_OUT,
15, 16
Input
XTAL_OUT is the output.
XTAL_IN
NOTE:
Pullup and Pulldown
refer to internal input resistors. See Table 2, Pin Characterristics, for typical values.
T
ABLE
2. P
IN
C
HARACTERISTICS
Symbol
C
IN
R
PULLUP
R
PULLDOWN
Parameter
Input Capacitance
Input Pullup Resistor
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
51
Maximum
Units
pF
kΩ
kΩ
843252AG-04
www.icst.com/products/hiperclocks.html
2
REV. A JANUARY 25, 2006
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS843252-04
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
3.3V LVPECL C
LOCK
G
ENERATOR
4.6V
-0.5V to V
CC
+ 0.5V
50mA
100mA
-65°C to 150°C
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.
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
CC
Inputs, V
I
Outputs, I
O
Continuous Current
Surge Current
Storage Temperature, T
STG
Package Thermal Impedance,
θ
JA
89°C/W (0 lfpm)
T
ABLE
3A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= V
CCA
= V
CCO
= 3.3V±5%, T
A
= 0°C
TO
70°C
Symbol
V
CC
V
CCA
I
CC
I
CCA
I
EE
Parameter
Core Supply Voltage
Analog Supply Voltage
Power Supply Current
Analog Supply Current
Power Supply Current
Test Conditions
Minimum
3.135
3.135
Typical
3.3
3.3
60
11
80
Maximum
3.465
3.465
Units
V
V
mA
mA
mA
T
ABLE
3B. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
CC
= V
CCA
= V
CCO
= 3.3V±5%, T
A
= 0°C
TO
70°C
Symbol
V
IH
V
IL
Parameter
Input High Voltage
Input Low Voltage
REF_CLK,
C LK _S E L,
FREQ_SEL,
nPLL_SEL
OE
REF_CLK,
C LK _S E L,
FREQ_SEL,
nPLL_SEL
OE
V
CC
= V
IN
= 3.465V
V
CC
= V
IN
= 3.465V
V
CC
= 3.465V, V
IN
= 0V
V
CC
= 3.465V, V
IN
= 0V
-5
-150
Test Conditions
Minimum
2
-0.3
Typical
Maximum
V
CC
+ 0.3
0.8
150
5
Units
V
V
µA
µA
µA
µA
I
IH
Input High Current
I
IL
Input Low Current
T
ABLE
3C. LVPECL DC C
HARACTERISTICS
,
V
CC
= V
CCA
= V
CCO
= 3.3V±5%, T
A
= 0°C
TO
70°C
Symbol
V
OH
V
OL
V
SWING
Parameter
Output High Voltage; NOTE 1
Output Low Voltage; NOTE 1
Peak-to-Peak Output Voltage Swing
Test Conditions
Minimum
V
CCO
- 1.4
V
CCO
- 2.0
0.6
Typical
Maximum
V
CCO
- 0.9
V
CCO
- 1.7
1. 0
Units
V
V
V
NOTE 1: Outputs terminated with 50
Ω
to V
CCO
- 2V.
843252AG-04
www.icst.com/products/hiperclocks.html
3
REV. A JANUARY 25, 2006
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS843252-04
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
3.3V LVPECL C
LOCK
G
ENERATOR
Test Conditions
Minimum
19.33
Typical
Fundamental
30
50
7
1
MHz
Ω
pF
mW
Maximum
Units
T
ABLE
4. C
RYSTAL
C
HARACTERISTICS
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
Drive Level
T
ABLE
5. AC C
HARACTERISTICS
,
V
CC
= V
CCA
= V
CCO
= 3.3V±5%, T
A
= 0°C
TO
70°C
Symbol
f
OUT
Parameter
Output Frequency
156.25MHz @ Integration Range:
1.875MHz - 20MHz
159.375MHz @ Integration Range:
1.875MHz - 20MHz
187.5MHz @ Integration Range:
1.875MHz - 20MHz
20% to 80%
Test Conditions
Minimum
145
0.39
0.38
0.38
TBD
400
Typical
Maximum
187.5
Units
MH z
ps
ps
ps
ps
ps
%
t
jit(Ø)
RMS Phase Jitter (Random);
NOTE 1
t
sk(o)
t
R
/ t
F
Output Skew; NOTE 2, 3
Output Rise/Fall Time
odc
Output Duty Cycle
50
NOTE 1: Please refer to the Phase Noise Plots following this section.
NOTE 2: Defined as skew between outputs at the same supply voltage and with equal load conditions.
Measured at V
CCO
/2.
NOTE 3: These parameters are guaranteed by characterization. Not tested in production.
843252AG-04
www.icst.com/products/hiperclocks.html
4
REV. A JANUARY 25, 2006
PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS843252-04
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
3.3V LVPECL C
LOCK
G
ENERATOR
P
ARAMETER
M
EASUREMENT
I
NFORMATION
2V
Phase Noise Plot
LVPECL
nQx
Noise Power
V
CC,
V
CCA,
V
CCO
Qx
SCOPE
Phase Noise Mask
V
EE
f
1
Offset Frequency
f
2
-1.3V ± 0.165V
RMS Jitter = Area Under the Masked Phase Noise Plot
3.3V O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
RMS P
HASE
J
ITTER
nQx
80%
Qx
nQy
Qy
80%
V
SW I N G
Clock
Outputs
20%
t
R
t
F
20%
tsk(o)
O
UTPUT
S
KEW
O
UTPUT
R
ISE
/F
ALL
T
IME
nQ0, nQ1
Q0, Q1
t
PW
t
PERIOD
odc =
t
PW
t
PERIOD
x 100%
O
UTPUT
D
UTY
C
YCLE
/P
ULSE
W
IDTH
/P
ERIOD
843252AG-04
www.icst.com/products/hiperclocks.html
5
REV. A JANUARY 25, 2006
Talking
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