Document Outline
- General Description
- Features
- Block Diagram
- Pin Assignment
- Pin Descriptions
- Pin Characteristics
- Output Enable & Clock Enable Function Table
- Absolute Maximum Ratings
- Power Supply DC Characteristics
- LVCMOS DC Characteristics
- AC Characteristics
- Parameter Measurement Information
- 3.3V Output Load AC Test Circuit Diagram
- Output Skew Diagram
- Part-to-Part Skew Diagram
- Propagation Delay Diagram
- Output Rise/Fall Time Diagram
- Output Duty Cycle/Pulse Width/Period Diagram
- Reliability Information
- Transistor Count
- Package Outline
- Package Dimensions
- Ordering Information
- Revision History Sheet
83947AYI
http://www.icst.com/products/hiperclocks.html
REV. B OCTOBER 11, 2004
1
Integrated
Circuit
Systems, Inc.
ICS83947I
L
OW
S
KEW
, 1-
TO
-9
LVCMOS F
ANOUT
B
UFFER
G
ENERAL
D
ESCRIPTION
The ICS83947I is a low skew, 1-to-9 LVCMOS
Fanout Buffer and a member of the HiPerClockSTM
family of High Performance Clock Solutions from
ICS. The low impedance LVCMOS/LVTTL out-
puts are designed to drive 50
series or parallel
terminated transmission lines. The effective fanout can be in-
creased from 9 to 18 by utilizing the ability of the outputs to
drive two series terminated lines.
Guaranteed output and part-to-part skew characteristics
make the ICS83947I ideal for high performance, single ended
applications that also require a limited output voltage.
B
LOCK
D
IAGRAM
P
IN
A
SSIGNMENT
F
EATURES
9 LVCMOS/LVTTL outputs
Selectable CLK0 and CLK1 can accept the following
input levels: LVCMOS and LVTTL
Maximum output frequency: 110MHz
Output skew: 500ps (maximum)
Part-to-part skew: 2ns (maximum)
3.3V operating supply
-40C to 85C ambient operating temperature
Lead-Free package available
Pin compatible with the MPC947
HiPerClockSTM
ICS
32-Lead LQFP
7mm x 7mm x 1.4mm package body
Y Package
Top View
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
GND
Q3
V
DDO
Q4
GND
Q5
V
DDO
GND
GND
CLK_SEL
CLK0
CLK1
CLK_EN
OE
V
DD
GND
GND
Q6
V
DDO
Q7
GND
Q8
V
DDO
GND
GND
Q2
V
DDO
Q1
GND
Q0
V
DDO
GND
ICS83947I
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
CLK0
CLK1
0
1
CLK_EN
CLK_SEL
D
Q
LE
OE
83947AYI
http://www.icst.com/products/hiperclocks.html
REV. B OCTOBER 11, 2004
2
Integrated
Circuit
Systems, Inc.
ICS83947I
L
OW
S
KEW
, 1-
TO
-9
LVCMOS F
ANOUT
B
UFFER
T
ABLE
1. P
IN
D
ESCRIPTIONS
T
ABLE
2. P
IN
C
HARACTERISTICS
T
ABLE
3. O
UTPUT
E
NABLE
AND
C
LOCK
E
NABLE
F
UNCTION
T
ABLE
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83947AYI
http://www.icst.com/products/hiperclocks.html
REV. B OCTOBER 11, 2004
3
Integrated
Circuit
Systems, Inc.
ICS83947I
L
OW
S
KEW
, 1-
TO
-9
LVCMOS F
ANOUT
B
UFFER
T
ABLE
4A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
DD
= V
DDO
= 3.3V0.3V, T
A
= -40C
TO
85C
T
ABLE
4B. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
DD
= V
DDO
= 3.3V0.3V, T
A
= -40C
TO
85C
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AXIMUM
R
ATINGS
Supply Voltage, V
DD
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Inputs, V
I
-0.5V to V
DD
+ 0.5 V
Outputs, V
O
-0.5V to V
DDO
+ 0.5V
Package Thermal Impedance,
JA
47.9C/W (0 lfpm)
Storage Temperature, T
STG
-65C to 150C
NOTE: 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 be-
yond those listed in the
DC Characteristics or AC Character-
istics is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect product reliability.
83947AYI
http://www.icst.com/products/hiperclocks.html
REV. B OCTOBER 11, 2004
4
Integrated
Circuit
Systems, Inc.
ICS83947I
L
OW
S
KEW
, 1-
TO
-9
LVCMOS F
ANOUT
B
UFFER
T
ABLE
5. AC C
HARACTERISTICS
,
V
DD
= V
DDO
= 3.3V0.3V, T
A
= -40C
TO
85C
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83947AYI
http://www.icst.com/products/hiperclocks.html
REV. B OCTOBER 11, 2004
5
Integrated
Circuit
Systems, Inc.
ICS83947I
L
OW
S
KEW
, 1-
TO
-9
LVCMOS F
ANOUT
B
UFFER
t
PD
V
DD
2
V
DDO
2
P
ARAMETER
M
EASUREMENT
I
NFORMATION
P
ROPAGATION
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ELAY
O
UTPUT
R
ISE
/F
ALL
T
IME
O
UTPUT
D
UTY
C
YCLE
/P
ULSE
W
IDTH
/P
ERIOD
Clock
Outputs
0.8V
2V
2V
0.8V
t
R
t
F
tsk(o)
V
DDO
2
V
DDO
2
Qx
Qy
O
UTPUT
S
KEW
P
ART
-
TO
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ART
S
KEW
3.3V O
UTPUT
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OAD
AC T
EST
C
IRCUIT
SCOPE
Qx
LVCMOS
tsk(pp)
V
DDO
2
V
DDO
2
Qx
Qy
PART 1
PART 2
CLK0,
CLK1
Q0:Q8
-1.65V 0.15V
1.65V 0.15V
Pulse Width
t
PERIOD
t
PW
t
PERIOD
odc =
V
DDO
2
Q0:Q8
V
DD
GND
83947AYI
http://www.icst.com/products/hiperclocks.html
REV. B OCTOBER 11, 2004
6
Integrated
Circuit
Systems, Inc.
ICS83947I
L
OW
S
KEW
, 1-
TO
-9
LVCMOS F
ANOUT
B
UFFER
R
ELIABILITY
I
NFORMATION
T
RANSISTOR
C
OUNT
The transistor count for ICS83947I is: 1040
T
ABLE
6.
JA
VS
. A
IR
F
LOW
T
ABLE
FOR
32 L
EAD
LQFP
JA
by Velocity (Linear Feet per Minute)
0
200
500
Single-Layer PCB, JEDEC Standard Test Boards
67.8C/W
55.9C/W
50.1C/W
Multi-Layer PCB, JEDEC Standard Test Boards
47.9C/W
42.1C/W
39.4C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
83947AYI
http://www.icst.com/products/hiperclocks.html
REV. B OCTOBER 11, 2004
7
Integrated
Circuit
Systems, Inc.
ICS83947I
L
OW
S
KEW
, 1-
TO
-9
LVCMOS F
ANOUT
B
UFFER
P
ACKAGE
O
UTLINE
- Y S
UFFIX
FOR
32 L
EAD
LQFP
T
ABLE
7. P
ACKAGE
D
IMENSIONS
N
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Reference Document: JEDEC Publication 95, MS-026
83947AYI
http://www.icst.com/products/hiperclocks.html
REV. B OCTOBER 11, 2004
8
Integrated
Circuit
Systems, Inc.
ICS83947I
L
OW
S
KEW
, 1-
TO
-9
LVCMOS F
ANOUT
B
UFFER
T
ABLE
8. 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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The aforementioned trademark, HiPerClockSTM is a trademark of Integrated Circuit Systems, Inc. or its subsidiaries in the United States and/or other countries.
83947AYI
http://www.icst.com/products/hiperclocks.html
REV. B OCTOBER 11, 2004
9
Integrated
Circuit
Systems, Inc.
ICS83947I
L
OW
S
KEW
, 1-
TO
-9
LVCMOS F
ANOUT
B
UFFER
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