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83940AY-01
www.icst.com/products/hiperclocks.html
REV. A JULY 31, 2001
1
ICS83940-01
L
OW
S
KEW
, 1-
TO
-18
LVCMOS F
ANOUT
B
UFFER
PRELIMINARY
G
ENERAL
D
ESCRIPTION
The ICS83940-01 is a low skew, 1-to-18 Fanout
Buffer and a member of the
HiPerClockS
family of High Performance Clock Solutions from
ICS. The low impedance LVCMOS out-
puts are designed to drive 50
series or parallel
terminated transmission lines. The effective fanout can be in-
creased from 18 to 36 by utilizing the ability of the outputs to
drive two series terminated lines. The differential clock
input is designed to accept any differential input levels
including LVPECL.
The ICS83940-01 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 ICS83940 ideal for those clock distribution applica-
tions demanding well defined performance and repeatability.
B
LOCK
D
IAGRAM
P
IN
A
SSIGNMENT
F
EATURES
18 LVCMOS outputs, 23
typical output impedance
Output frequency up to 200MHz
100ps output skew
Part to part skew: 850ps
Selectable LVCMOS or differential clock input
LVTTL / LVCMOS clock select input
Full 3.3V, 2.5V or mixed 3.3V, 2.5V supply modes
0°C to 70°C ambient operating temperature
Industrial temperature information available upon request
HiPerClockS
,&6
32-Lead LQFP
Y Pacakge
7mm x 7mm x 1.4mm package body
Top View
Q0
Q1 - Q16
Q17
CLK_SEL
CLK0
nCLK0
LVCMOS_CLK
0
1
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
Q6
Q7
Q8
VDDO
Q9
Q10
Q11
GND
GND
GND
LVCMOS_CLK
CLK_SEL
CLK
nCLK
VDDI
VDDO
V
Q
Q
Q
G
Q
Q
Q
G
Q
Q
Q
V
Q
Q
Q
ICS83940-01
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.