PRELIMINARY
LOW SKEW, 1-TO-24 DIFFERENTIAL-
TO-LVCMOS/LVTTL FANOUT BUFFER
ICS8344I-01
GENERAL DESCRIPTION
FEATURES
The ICS8344I-01 is a low voltage, low skew
• Twenty-four LVCMOS/LVTTL outputs,
7Ω typical output impedance
ICS
HiPerClockS™
fanout buffer and a member of the HiPerClockS™
family of High Performance Clock Solutions from
• Two selectable differential CLKx, nCLKx inputs
IDT. The ICS8344I-01 has two selectable clock in-
puts. The CLKx, nCLKx pairs can accept most
• CLK0, nCLK0 and CLK1, nCLK1 pairs can accept the
following input levels: LVDS, LVPECL, LVHSTL, SSTL, HCSL
standard differential input levels. The ICS8344I-01 is designed
to translate any differential signal level to LVCMOS/LVTTL lev-
els. The low impedance LVCMOS/LVTTL outputs are designed
to drive 50Ω series 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
inputs which also facilitate board level testing. The clock
enable is internally synchronized to eliminate runt pulses on
the outputs during asynchronous assertion/deassertion of the
clock enable pin. The outputs are driven low when disabled.
The ICS8344I-01 is characterized at full 3.3V, full 2.5V and
mixed 3.3V input and 2.5V output operating supply modes.
• Maximum output frequency: 200MHz
• Translates any single ended input signal to LVCMOS/LVTTL
with resistor bias on nCLK input
• Synchronous clock enable
• Output skew: 250ps (maximum)
• Part-to-part skew: 1ns (maximum)
• Bank skew: 125ps (maximum)
• Propagation delay: 5.25ns (maximum)
• Output supply modes:
Core/Output
3.3V/3.3V
Guaranteed output and part-to-part skew characteristics make
the ICS8344I-01 ideal for those clock distribution applications
demanding well defined performance and repeatability.
2.5V/2.5V
3.3V/2.5V
• -40°C to 85°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
BLOCK DIAGRAM
PIN ASSIGNMENT
CLK_SEL
CLK0
48 47 46 45 44 43 42 41 40 39 38 37
0
nCLK0
Q16
Q17
VDDO
GND
Q18
Q19
Q20
Q21
VDDO
GND
Q22
Q23
1
36
35
34
33
32
31
30
29
28
27
26
25
Q7
2
Q6
CLK1
nCLK1
1
3
VDDO
GND
Q5
Q0:Q7
4
ICS8344-01
5
48-Lead LQFP
7mm x 7mm x 1.4mm
package body
Y Package
6
Q4
Q8:Q15
Q16:Q23
7
Q3
8
Q2
9
VDDO
GND
Q1
Top View
10
11
12
Q0
LE
nD
13 14 15 16 17 18 19 20 21 22 23 24
Q
CLK_EN
OE
The Preliminary Information presented herein represents a product in pre-production.The noted characteristics are based on initial product characterization
and/or qualification.Integrated DeviceTechnology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT™ / ICS™ LVCMOS/LVTTL FANOUT BUFFER
1
ICS8344AYI-01 REV. B MAY 10, 2007