Integrated
Circuit
Systems, Inc.
ICS843-75
75MH
Z
, LVCMOS, LVPECL
D
UAL
O
UTPUT
O
SCILLATOR
F
EATURES
•
One LVCMOS/LVTTL output, 15Ω output impedence
One LVPECL output pair
•
Crystal oscillator interface designed for 25MHz,
18pF parallel resonant crystal
•
Output frequency: 75MHz
•
Random jitter: 3.07ps (maximum)
•
Deterministic jitter: 0.13ps (maximum)
•
3.3V operating supply
•
0°C to 70°C ambient operating temperature
•
Available in both standard and lead-free RoHS-compliant
packages
G
ENERAL
D
ESCRIPTION
The ICS843-75 is a SAS/SATA Dual Output
Oscillator and a member of the HiPerClocks
TM
HiPerClockS™
family of high performance devices from ICS.
The ICS843-75 uses a 25MHz crystal to
s y n t h e s i ze 7 5 M H z . T h e I C S 8 4 3 - 7 5 h a s
excellent jitter performance. The ICS843-75 is packaged
in a small 8-pin TSSOP, making it ideal for use in systems
with limited board space.
IC
S
B
LOCK
D
IAGRAM
LVCMOS
75MHz
25MHz
P
IN
A
SSIGNMENT
Q0
V
CC
XTAL_IN
XTAL_OUT
V
EE
1
2
3
4
8
7
6
5
Q1
nQ1
V
CCO
Q0
XTAL_IN
Clock
Synthesizer
LVPECL
75MHz
XTAL_OUT
ICS843-75
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
Q1
nQ1
ICS843-75
8-Lead SOIC
3.90mm x 4.92mm x 1.37mm body package
M Package
Top View
843AG-75
www.icst.com/products/hiperclocks.html
1
REV. A JANUARY 9, 2006
Integrated
Circuit
Systems, Inc.
ICS843-75
75MH
Z
, LVCMOS, LVPECL
D
UAL
O
UTPUT
O
SCILLATOR
Type
Power
Input
Power
Description
Positive supply pin.
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
Negative supply pin.
Single-ended clock output. LVCMOS/LVTTL interface levels.
15
Ω
output impedence.
Output supply pin.
Differential LVPECL output pair.
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1
2, 3
4
5
6
7, 8
Name
V
CC
XTAL_IN,
XTAL_OUT
V
EE
Q0
V
CCO
nQ1, Q1
Output
Power
Output
T
ABLE
2. P
IN
C
HARACTERISTICS
Symbol
C
IN
R
OUT
Parameter
Input Capacitance
Output Impedance
Q0
Test Conditions
Minimum
Typical
4
15
Maximum
Units
pF
Ω
843AG-75
www.icst.com/products/hiperclocks.html
2
REV. A JANUARY 9, 2006
Integrated
Circuit
Systems, Inc.
ICS843-75
75MH
Z
, LVCMOS, LVPECL
D
UAL
O
UTPUT
O
SCILLATOR
4.6V
-0.5V to V
CC
+ 0.5 V
-0.5V to V
CCO
+ 0.5V
50mA
100mA
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent damage to the
device. These ratings are stress specifications only. Func-
tional operation of product at these conditions or any condi-
tions beyond those listed in the
DC Characteristics
or
AC
Characteristics
is not implied. Exposure to absolute maxi-
mum rating conditions for extended periods may affect prod-
uct reliability.
101.7°C/W (0 mps)
112.7°C/W (0 lfpm)
-65°C to 150°C
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
CC
Inputs, V
I
Outputs, V
O
(LVCMOS)
Outputs, I
O
(LVPECL)
Continuous Current
Surge Current
Package Thermal Impedance,
θ
JA
8 Lead TSSOP
8 Lead SOIC
Storage Temperature, T
STG
T
ABLE
3A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= V
CCO
= 3.3V±0.3V, T
A
= 0°C
TO
70°C
Symbol
V
CC
V
CCO
I
EE
I
CC
I
CCO
Parameter
Positive Supply Voltage
Output Supply Voltage
Power Supply Current
Power Supply Current
Output Supply Current
Test Conditions
Minimum
3.0
3.0
Typical
3.3
3.3
Maximum
3.6
3.6
110
100
12
Units
V
V
mA
mA
mA
T
ABLE
3B. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
CC
= V
CCO
= 3.3V±0.3V, T
A
= 0°C
TO
70°C
Symbol
V
OH
Parameter
Output High Voltage; NOTE 1
Test Conditions
Minimum
2.6
0.5
Typical
Maximum
Units
V
V
Output Low Voltage; NOTE 1
V
OL
NOTE 1: Outputs terminated with 50
Ω
to V
CCO
/2. See Parameter Measurement Information Section,
"3.3V Output Load Test Circuit".
T
ABLE
3C. LVPECL DC C
HARACTERISTICS
,
V
CC
= V
CCO
= 3.3V±0.3V, 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.
843AG-75
www.icst.com/products/hiperclocks.html
3
REV. A JANUARY 9, 2006
Integrated
Circuit
Systems, Inc.
ICS843-75
75MH
Z
, LVCMOS, LVPECL
D
UAL
O
UTPUT
O
SCILLATOR
Test Conditions
Minimum
Typical
Fundamental
25
±30
±30
18
±15
1
MHz
ppm
ppm
pF
ppm
mW
Maximum
Units
T
ABLE
4. C
RYSTAL
C
HARACTERISTICS
(NOTE 1)
Parameter
Mode of Oscillation
Frequency
Frequency Tolerance
Frequency Stability Over Operating
Temperature Range
Load Capacitance (C
L
); NOTE 2
Aging for 10 Years
Drive Level
NOTE 1: Using an HC49/US SMD package, the parameters shown above target ±100ppm accuracy.
NOTE 2: See
Cr ystal Input Interface
in the Application Information Section.
T
ABLE
5. AC C
HARACTERISTICS
,
V
CC
= V
CCO
= 3.3V±0.3V, T
A
= 0°C
TO
70°C
Symbol
f
OUT
t
DJ
t
RJ
t
RMS
t
p-p
t
OSC
t
R
/ t
F
odc
Parameter
Output Frequency
Deterministic Jitter ; NOTE 1
Random Jitter ; NOTE 1
RMS of Total Distribution (
σ
);
NOTE 2
Peak-to-Peak Jitter ; NOTE 1
Oscillation Star t Up Time
Output
Rise/Fall Time
Output
Duty Cycle
Q0
Q1/nQ1
20% to 80%
100
250
Test Conditions
Minimum
Typical
75
0.13
3.07
3.08
25
10
500
800
52
51
Maximum
Units
MHz
ps
ps
ps
ps
ms
ps
ps
%
%
Q0
48
Q1, nQ1
49
NOTE 1: Measured using Wavecrest SIA-3000.
NOTE 2: Measured using Wavecrest SIA-3000, Tj @ 10e-12BER result divided by 14.
843AG-75
www.icst.com/products/hiperclocks.html
4
REV. A JANUARY 9, 2006
Integrated
Circuit
Systems, Inc.
ICS843-75
75MH
Z
, LVCMOS, LVPECL
D
UAL
O
UTPUT
O
SCILLATOR
P
ARAMETER
M
EASUREMENT
I
NFORMATION
1.65V ± 0.15V
2V
V
CC,
V
CCO
SCOPE
Qx
V
CC,
V
CCO
Qx
SCOPE
LVCMOS
GND
LVPECL
nQx
V
EE
-1.65V ± 0.15V
-1.3V ± 0.3V
3.3V LVCMOS O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
3.3V LVPECL O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
V
CC
nQ1
Q1
Q0
t
PW
t
2
t
PW
PERIOD
t
PERIOD
odc =
t
PW
t
PERIOD
x 100%
odc =
t
PW
t
PERIOD
x 100%
LVCMOS O
UTPUT
D
UTY
C
YCLE
/P
ULSE
W
IDTH
/P
ERIOD
LVPECL O
UTPUT
D
UTY
C
YCLE
/P
ULSE
W
IDTH
/P
ERIOD
80%
20%
t
R
80%
20%
t
F
Clock
Outputs
80%
80%
V
SW I N G
Clock
Outputs
20%
t
R
t
F
20%
LVCMOS O
UTPUT
R
ISE
/F
ALL
T
IME
843AG-75
LVPECL O
UTPUT
R
ISE
/F
ALL
T
IME
www.icst.com/products/hiperclocks.html
5
REV. A JANUARY 9, 2006
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