83940AY-01
www.icst.com/products/hiperclocks.html
REV. A JULY 31, 2001
1
Integrated
Circuit
Systems, Inc.
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 HiPerClockSTM
family of High Performance Clock Solutions from
I C S . T h e l o w i m p e d a n c e LV C M O S o u t -
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
0C to 70C ambient operating temperature
Industrial temperature information available upon request
HiPerClockSTM
,&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
VDDO
Q12
Q13
Q14
GND
Q15
Q16
Q17
GND
Q5
Q4
Q3
VDDO
Q2
Q1
Q0
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.
83940AY-01
www.icst.com/products/hiperclocks.html
REV. A JULY 31, 2001
2
Integrated
Circuit
Systems, Inc.
ICS83940-01
L
OW
S
KEW
, 1-
TO
-18
LVCMOS F
ANOUT
B
UFFER
PRELIMINARY
T
ABLE
1. P
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D
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83940AY-01
www.icst.com/products/hiperclocks.html
REV. A JULY 31, 2001
3
Integrated
Circuit
Systems, Inc.
ICS83940-01
L
OW
S
KEW
, 1-
TO
-18
LVCMOS F
ANOUT
B
UFFER
PRELIMINARY
T
ABLE
3A. C
LOCK
S
ELECT
F
UNCTION
T
ABLE
T
ABLE
3B. C
LOCK
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V
83940AY-01
www.icst.com/products/hiperclocks.html
REV. A JULY 31, 2001
4
Integrated
Circuit
Systems, Inc.
ICS83940-01
L
OW
S
KEW
, 1-
TO
-18
LVCMOS F
ANOUT
B
UFFER
PRELIMINARY
T
ABLE
4C. D
IFFERENTIAL
DC C
HARACTERISTICS
,
VDDI = VDDO = 3.3V5%, T
A
= 0
TO
70
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, VDD
4.6V
Inputs, V
I
-0.5V to VDD+0.5 V
Outputs, V
O
-0.5V to VDD+0.5V
Package Thermal Impedance,
JA
46C/W (0lfpm)
Storage Temperature, Tstg
-65C to 150C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are
stress specifications only. Functional operation of product at these conditions or any conditions beyond those listed in the
DC Characteristics or AC Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect product reliability.
T
ABLE
4A. DC C
HARACTERISTICS
,
VDDI = VDDO = 3.3V5%, T
A
= 0
TO
70
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HARACTERISTICS
,
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T
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83940AY-01
www.icst.com/products/hiperclocks.html
REV. A JULY 31, 2001
5
Integrated
Circuit
Systems, Inc.
ICS83940-01
L
OW
S
KEW
, 1-
TO
-18
LVCMOS F
ANOUT
B
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PRELIMINARY
T
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5A. AC C
HARACTERISTICS
,
VDDI = VDDO = 3.3V5%, T
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E
T
O
N
83940AY-01
www.icst.com/products/hiperclocks.html
REV. A JULY 31, 2001
6
Integrated
Circuit
Systems, Inc.
ICS83940-01
L
OW
S
KEW
, 1-
TO
-18
LVCMOS F
ANOUT
B
UFFER
PRELIMINARY
T
ABLE
4F. D
IFFERENTIAL
DC C
HARACTERISTICS
,
VDDI = 3.3V5%; VDDO = 2.5V5%, T
A
= 0
TO
70
T
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4D. P
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S
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,
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A
= 0
TO
70
T
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4E. LVCMOS DC C
HARACTERISTICS
,
VDDI = 3.3V5%; VDDO = 2.5V5%, T
A
= 0
TO
70
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2
E
T
O
N
83940AY-01
www.icst.com/products/hiperclocks.html
REV. A JULY 31, 2001
7
Integrated
Circuit
Systems, Inc.
ICS83940-01
L
OW
S
KEW
, 1-
TO
-18
LVCMOS F
ANOUT
B
UFFER
PRELIMINARY
T
ABLE
5B. AC C
HARACTERISTICS
,
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A
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83940AY-01
www.icst.com/products/hiperclocks.html
REV. A JULY 31, 2001
8
Integrated
Circuit
Systems, Inc.
ICS83940-01
L
OW
S
KEW
, 1-
TO
-18
LVCMOS F
ANOUT
B
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PRELIMINARY
T
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4I. D
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,
VDDI = VDDO = 25V5%, T
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= 0
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4H. LVCMOS DC C
HARACTERISTICS
,
VDDI = VDDO = 2.5V5%, T
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E
T
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83940AY-01
www.icst.com/products/hiperclocks.html
REV. A JULY 31, 2001
9
Integrated
Circuit
Systems, Inc.
ICS83940-01
L
OW
S
KEW
, 1-
TO
-18
LVCMOS F
ANOUT
B
UFFER
PRELIMINARY
T
ABLE
5C. AC C
HARACTERISTICS
,
VDDI = VDDO = 2.5V5%, T
A
= 0
TO
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T
:
4
E
T
O
N
83940AY-01
www.icst.com/products/hiperclocks.html
REV. A JULY 31, 2001
10
Integrated
Circuit
Systems, Inc.
ICS83940-01
L
OW
S
KEW
, 1-
TO
-18
LVCMOS F
ANOUT
B
UFFER
PRELIMINARY
P
ACKAGE
O
UTLINE
- Y S
UFFIX
T
ABLE
6. P
ACKAGE
D
IMENSIONS
N
O
I
T
A
I
R
A
V
C
E
D
E
J
S
R
E
T
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M
I
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C
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R
EFERENCE
D
OCUMENT
: JEDEC P
UBLICATION
95, MS-026
83940AY-01
www.icst.com/products/hiperclocks.html
REV. A JULY 31, 2001
11
Integrated
Circuit
Systems, Inc.
ICS83940-01
L
OW
S
KEW
, 1-
TO
-18
LVCMOS F
ANOUT
B
UFFER
PRELIMINARY
T
ABLE
7. O
RDERING
I
NFORMATION
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) assumes no responsibility for either its use
or for infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use
in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements
are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS
product for use in life support devices or critical medical instruments.
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