ICS8344 View Datasheet(PDF) - Integrated Device Technology
Part Name
Description
MFG CO.
ICS8344 Datasheet PDF : 18 Pages
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ICS8344
LOW SKEW, 1-TO-24
DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER
GENERAL DESCRIPTION
The ICS8344 is a low voltage, low skew, 1-to-24 Differential-
to-LVCMOS Fanout Buffer. The ICS8344 is designed to trans-
late any differential signal levels to LVCMOS levels. The low
impedance LVCMOS outputs are designed to drive 50Ω se-
ries or parallel terminated transmission lines. The effective
fanout can be increased to 48 by utilizing the ability of the
outputs to drive two series terminated lines. Redundant clock
applications can make use of the dual clock input. The dual
clock inputs also facilitate board level testing. ICS8344 is
characterized at full 3.3V, full 2.5V and mixed 3.3V input and
2.5V output operating supply modes.
Guaranteed output and part-to-part skew characteristics
make the ICS8344 ideal for those clock distribution applica-
tions demanding well defined performance and repeatability.
FEATURES
• Twenty-four LVCMOS outputs, 7Ω typical output impedance
• Selectable differential clock input pairs for redundant
clock applications
• CLKx, nCLKx pairs can accept the following differential
input levels: LVDS, LVPECL, LVHSTL, SSTL, HCSL
• Maximum output frequency: 167MHz
• Translates any differential input signal (LVPECL, LVHSTL,
LVDS) to LVCMOS without external bias networks
• Translates any single-ended input signal to LVCMOS
with resistor bias on nCLK input
• Multiple output enable pins for disabling unused outputs
in reduced fanout applications
• Output skew: 275ps (maximum)
• Part-to-part skew: 600ps (maximum)
• Bank skew: 150ps (maximum)
• Propagation Delay: 4.3ns (maximum)
• 3.3V, 2.5V or mixed 3.3V, 2.5V operating supply modes
• 0°C to 70°C ambient operating temperature
• Available in standard (RoHS 5) and lead-free (RoHS 6)
packages
BLOCK DIAGRAM
PIN ASSIGNMENT
CLK_SEL
CLK0
0
nCLK0
CLK1
1
nCLK1
OE1
OE2
OE3
Q0:Q7
O8:Q15
O16:Q23
Q16
Q17
VDDO
GND
Q18
Q19
Q20
Q21
VDDO
GND
Q22
Q23
48 47 46 45 44 43 42 41 40 39 38 37
1
36
2
35
3
34
4
33
5
32
6
ICS8344
31
7
30
8
29
9
28
10
27
11
26
12
25
13 14 15 16 17 18 19 20 21 22 23 24
Q7
Q6
VDDO
GND
Q5
Q4
Q3
Q2
VDDO
GND
Q1
Q0
8344BY
48-Lead LQFP
7mm x 7mm x 1.4mm package body
Y Package
Top View
1
REV. A JANUARY 5, 2011
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