889831AK www.icst.com/products/hiperclocks.html REV. A JUNE 16, 2005
1
Integrated
Circuit
Systems, Inc.
ICS889831
LOW SKEW, 1-TO-4
DIFFERENTIAL LVPECL-TO-LVPECL/ECL FANOUT BUFFER
GENERAL DESCRIPTION
The ICS889831 is a high speed 1-to-4 Differential-
to-LVPECL/ECL Fanout Buffer and is a member
of the HiPerClockS™ 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.
FEATURES
• 4 differential LVPECL/ECL outputs
• IN, nIN pair can accept the following differential input levels:
LVPECL, LVDS, CML, SSTL
• 50Ω 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%
• -40°C to 85°C ambient operating temperature
• Lead-Free package fully RoHS compliant
BLOCK DIAGRAM PIN ASSIGNMENT
HiPerClockS™
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
VREF_AC
nIN
Q3
nQ3
V
CC
EN
nQ0
Q0
V
CC
VEE
1
2
3
4
12
11
10
9
5 6 7 8
16 15 14 13
50Ω
50Ω
