889831AK
www.icst.com/products/hiperclocks.html
REV. A JUNE 16, 2005
1
Integrated
Circuit
Systems, Inc.
ICS889831
L
OW
S
KEW
, 1-
TO
-4
D
IFFERENTIAL
LVPECL-
TO
-LVPECL/ECL F
ANOUT
B
UFFER
G
ENERAL
D
ESCRIPTION
The ICS889831 is a high speed 1-to-4 Differential-
to-LVPECL/ECL Fanout Buffer and is a member
of the HiPerClockS
TM
family of high performance
clock solutions from ICS. The ICS889831 is
optimized for high speed and very low output
skew, making it suitable for use in demanding applications
such as SONET, 1 Gigabit and 10 Gigabit Ethernet, and Fibre
Channel. The internally terminated differential input and
V
REF
_
AC
pin allow other differential signal families such as
LVDS, LVHSTL and CML to be easily interfaced to the input
with minimal use of external components. The device also has
an output enable pin which may be useful for system test
and debug purposes. The ICS889831 is packaged in a small
3mm x 3mm 16-pin VFQFN package which makes it ideal
for use in space-constrained applications.
F
EATURES
4 differential LVPECL/ECL outputs
IN, nIN pair can accept the following differential input levels:
LVPECL, LVDS, CML, SSTL
50 internal input termination to V
T
Maximum output frequency: > 2.1GHz
Output skew: 30ps (maximum)
Part-to-part skew: 185ps (maximum)
Additive phase jitter, RMS: 0.27ps (typical)
Propagation delay: 570ps (maximum)
LVPECL mode operating voltage supply range:
V
CC
= 2.5V 5%, 3.3V 5%, V
EE
= 0V
ECL mode operating voltage supply range:
V
CC
= 0V, V
EE
= -3.3V 5%, 2.5V 5%
-40C to 85C ambient operating temperature
Lead-Free package fully RoHS compliant
B
LOCK
D
IAGRAM
P
IN
A
SSIGNMENT
HiPerClockSTM
ICS
IN
V
T
nIN
Q0
nQ0
Q1
nQ1
Q2
nQ2
Q3
nQ3
EN
D
Q
LE
V
REF_AC
ICS889831
16-Lead VFQFN
3mm x 3mm x 0.95 package body
K Package
Top View
Q1
nQ1
Q2
nQ2
IN
V
T
V
REF
_
AC
nIN
Q3
nQ3
V
CC
EN
nQ0
Q0
V
CC
V
EE
1
2
3
4
12
11
10
9
5 6 7 8
16 15 14 13
5 0
5 0
889831AK
www.icst.com/products/hiperclocks.html
REV. A JUNE 16, 2005
4
Integrated
Circuit
Systems, Inc.
ICS889831
L
OW
S
KEW
, 1-
TO
-4
D
IFFERENTIAL
LVPECL-
TO
-LVPECL/ECL F
ANOUT
B
UFFER
T
ABLE
4A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= 2.5V 5%, 3.3V 5%; V
EE
= 0V
l
o
b
m
y
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r
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I
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o
P
0
6
A
m
A
BSOLUTE
M
AXIMUM
R
ATINGS
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent damage
to the device. These ratings are stress specifi-
cations only. Functional operation of product at
these conditions or any conditions beyond those
listed in the
DC Characteristics or AC Character-
istics is not implied. Exposure to absolute maxi-
mum rating conditions for extended periods may
affect product reliability.
Supply Voltage, V
CC
4.6V (LVPECL mode, V
EE
= 0)
Negative Supply Voltage, V
EE
-4.6V (ECL mode, V
CC
= 0)
Inputs, V
I
(LVPECL mode)
-0.5V to V
CC
+ 0.5 V
Inputs, V
I
(ECL mode)
0.5V to V
EE
- 0.5V
Outputs, I
O
Continuous Current
50mA
Surge Current
100mA
Input Current, IN, nIN
50mA
V
T
Current, I
VT
100mA
Input Sink/Source, I
REF_AC
0.5mA
Operating Temperature Range, TA -40C to +85C
Storage Temperature, T
STG
-65C to 150C
Package Thermal Impedance,
JA
51.5C/W (0 lfpm)
(Junction-to-Ambient)
T
ABLE
4B. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
CC
= 2.5V 5%, 3.3V 5%; V
EE
= 0V
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o
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ABLE
4C. DC C
HARACTERISTICS
,
V
CC
= 2.5V 5%, 3.3V 5%; V
EE
= 0V
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