ICS8538-31 Datasheet, PDF (1/14 Pages) Integrated Device Technology – LOW SKEW, 1-TO-8, CRYSTAL OSCILLATOR/LVCMOS-TO-3.3V LVPECL FANOUT BUFFER

LOW SKEW, 1-TO-8, CRYSTAL OSCILLATOR/
LVCMOS-TO-3.3V LVPECL FANOUT BUFFER
ICS8538-31
General Description
The ICS8538-31 is a low skew, high performance
ICS
1-to-8 Crystal Oscillator/LVCMOS-to-3.3V LVPECL
HiPerClockS™ _{Fanout Buffer and a member of the HiPerClockS™}
family of High Performance Clock Solutions from
IDT. The ICS8538-31 has selectable 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 outputs during asynchronous
assertion/deassertion of the clock enable pin.
Guaranteed output and part-to-part skew characteristics make the
ICS8538-31 ideal for those applications demanding well defined
performance and repeatability.
Features
• Eight differential 3.3V LVPECL outputs
• Selectable LVCMOS/LVTTL clock or crystal inputs
• CLK can accept the following input levels: LVCMOS, LVTTL
• Maximum output frequency: 266MHz
• Crystal frequency range: 14MHz - 40MHz
• Output skew: 50ps (maximum)
• Part-to-part skew: 250ps (maximum)
• Propagation delay: 2.2ns (maximum)
• 3.3V operating supply mode
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
Block Diagram
CLK_EN ^Pullup
CLK ^Pulldown
0
XTAL_IN
OSC
1
XTAL_OUT
CLK_SEL ^Pulldown
D
Q
LE
Q0
nQ0
Q1
nQ1
Q2
nQ2
Q3
nQ3
Q4
nQ4
Q5
nQ5
Q6
nQ6
Q7
nQ7
Pin Assignment
CLK 1
CLK_SEL 2
CLK_EN 3
VEE 4
nQ7 5
Q7 6
VCCO 7
nQ6 8
Q6 9
nQ5 10
Q5 11
VEE 12
nQ4 13
Q4 14
28 VCC
27 XTAL_IN
26 XTAL_OUT
25 VEE
24 Q0
23 nQ0
22 VCCO
21 Q1
20 nQ1
19 Q2
18 nQ2
17 VCCO
16 Q3
15 nQ3
28-Lead TSSOP, 173MIL
4.4mm x 9.7mm x 0.925mm package body
G Package
Top View
IDT™ / ICS™ LVPECL FANOUT BUFFER
1
ICS8538BG-31 REV. B FEBRUARY 5, 2008