Integrated
Circuit
Systems, Inc.
ICS8535-31
L
OW
S
KEW
, 1-
TO
-4, C
RYSTAL
O
SCILLATOR
/
LVCMOS-
TO
-3.3V LVPECL F
ANOUT
B
UFFER
F
EATURES
•
4 differential 3.3V LVPECL outputs
•
Selectable LVCMOS/LVTTL CLK or crystal inputs
•
CLK can accept the following input levels: LVCMOS, LVTTL
•
Maximum output frequency: 266MHz
•
Output skew: 30ps (maximum)
•
Part-to-part skew: 200ps (maximum)
•
Propagation delay: 1.65ns (maximum)
•
Additive phase jitter, RMS: 0.057ps (typical)
•
3.3V operating supply
•
0°C to 70°C ambient operating temperature
•
Lead-Free package fully RoHS compliant
•
Industrial Temperature information available upon request
•
Replaces the ICS8535-11
G
ENERAL
D
ESCRIPTION
The ICS8535-31 is a low skew, high performance
1-to-4 3.3V Crystal Oscillator/LVCMOS-to-3.3V
HiPerClockS™
LVPECL fanout buffer and a member of the
HiPerClockS™ family of High Performance Clock
Solutions from ICS. The ICS8535-31 has select-
able single ended clock or crystal inputs. The single ended
clock input accepts LVCMOS or LVTTL input levels and
translate them to 3.3V LVPECL levels. The output enable is
internally synchronized to eliminate runt pulses on the out-
puts during asynchronous assertion/deassertion of the clock
enable pin.
ICS
Guaranteed output and part-to-part skew characteristics
make the ICS8535-31 ideal for those applications demand-
ing well defined performance and repeatability.
B
LOCK
D
IAGRAM
CLK_EN
Pullup
D
Q
LE
CLK
Pulldown
0
Q0
nQ0
P
IN
A
SSIGNMENT
V
EE
CLK_EN
CLK_SEL
CLK
nc
XTAL_IN
XTAL_OUT
nc
nc
V
CC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Q0
nQ0
V
CC
Q1
nQ1
Q2
nQ2
V
CC
Q3
nQ3
XTAL_IN
OSC
XTAL_OUT
CLK_SEL
Pulldown
1
Q1
nQ1
Q2
nQ2
Q3
nQ3
ICS8535-31
20-Lead TSSOP
6.5mm x 4.4mm x 0.92mm package body
G Package
Top View
8535AG-31
www.icst.com/products/hiperclocks.html
1
REV. B APRIL 29, 2005
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
