Integrated
Circuit
Systems, Inc.
ICS8501
L
OW
S
KEW
1-
TO
-16 D
IFFERENTIAL
C
URRENT
M
ODE
F
ANOUT
B
UFFER
8501
www.icst.com
REV. A - AUGUST 23, 2000
1
F
EATURES
16 small swing DCM outputs
Translates any differential input signal(PECL, HSTL, LVDS,
DCM) to DCM levels without external bias networks
Translates single ended input levels to DCM levels with a
resistor bias network on the nCLK input
Translates single ended input levels to inverted DCM levels
with a resistor bias network on the CLK input
Voh(max) = 1.2V
40% of Voh
Vcrossover
60% of Voh
45%
Duty Cycle
55%
Output frequency up to 500MHz
100ps output skew
3.3V operating supply
48 lead low-profile QFP(LQFP), 7mm x 7mm x 1.4mm
package body, 0.5mm package lead pitch
0C to 70C ambient operating temperature
B
LOCK
D
IAGRAM
P
IN
A
SSIGNMENT
48 47 46 45 44 43 42 41 40 39 38 37
13 14 15 16 17 18 19 20 21 22 23 24
1
2
3
4
5
6
7
8
9
10
11
12
36
35
34
33
32
31
30
29
28
27
26
25
VCC
Q11
nQ11
Q10
nQ10
GND
Q9
nQ9
Q8
nQ8
VCC
nc
CLK
VCC
nQ0
Q0
nQ1
Q1
GND
nQ2
Q2
nQ3
Q3
VCC
nCLK
VCC
Q15
nQ15
Q14
nQ14
GND
Q13
nQ13
Q12
nQ12
VCC
ICS8501
VCC
nQ4
Q4
nQ5
Q5
GND
nQ6
Q6
nQ7
Q7
VCC
RREF
G
ENERAL
D
ESCRIPTION
The ICS8501 is a low skew, 1-to-16 Differential
Current Mode Fanout Buffer and a member of
the HiPerClockS family of High Performance
Clock Solutions from ICS. The ICS8501 is de-
signed to translate any differential signal levels
to small swing differential current mode(DCM) output levels.
An external reference resistor is used to set the value of the
current supplied to an external load load/termination resis-
tor. The load resistor value is chosen to equal the value of
the characteristic line impedance of 50
. The ICS8501 is char-
acterized at an operating supply voltage of 3.3V.
The small swing outputs, accurate crossover voltage and duty
cycle makes the ICS8501 ideal for interfacing to todays most
advanced microprocessors.
HiPerClockSTM
,&6
CLK
nCLK
Q0
nQ0
Q1
nQ1
Q2
nQ2
Q3
nQ3
Q4
nQ4
Q5
nQ5
Q6
nQ6
Q7
nQ7
Q15
nQ15
Q14
nQ14
Q13
nQ13
Q12
nQ12
Q11
nQ11
Q10
nQ10
Q9
nQ9
Q8
nQ8
48-Lead LQFP
Y Package
Top View
Integrated
Circuit
Systems, Inc.
ICS8501
L
OW
S
KEW
1-
TO
-16 D
IFFERENTIAL
C
URRENT
M
ODE
F
ANOUT
B
UFFER
8501
www.icst.com
REV. A - AUGUST 23, 2000
2
T
ABLE
1. P
IN
D
ESCRIPTIONS
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IN
C
HARACTERISTICS
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4
1
K
Integrated
Circuit
Systems, Inc.
ICS8501
L
OW
S
KEW
1-
TO
-16 D
IFFERENTIAL
C
URRENT
M
ODE
F
ANOUT
B
UFFER
8501
www.icst.com
REV. A - AUGUST 23, 2000
3
T
ABLE
4. DC E
LECTRICAL
C
HARACTERISTICS
,
VCC = 3.3V5%, T
A
= 0C
TO
70C
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage
4.6V
Inputs
-0.5V to VCC+0.5 V
Outputs
-0.5V to VCC+0.5V
Ambient Operating Temperature
0C to 70C
Storage Temperature
-65C to 150C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications
only and functional operation of the device at these or any conditions beyond those listed in the DC Electrical Characteristics or AC Electrical
Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.
T
ABLE
5. AC E
LECTRICAL
C
HARACTERISTICS
,
VCC = 3.3V5%, T
A
= 0C
TO
70C
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C
C
I
Integrated
Circuit
Systems, Inc.
ICS8501
L
OW
S
KEW
1-
TO
-16 D
IFFERENTIAL
C
URRENT
M
ODE
F
ANOUT
B
UFFER
8501
www.icst.com
REV. A - AUGUST 23, 2000
4
F
IGURE
1A, 1B, 1C - I
NPUT
C
LOCK
W
AVEFORMS
VPP
VCMR
CLK
nCLK
GND
VCC
CROSS POINTS
F
IGURE
1A - DCM, LVDS, HSTL, SSTL D
IFFERENTIAL
I
NPUT
L
EVELS
VPP
VCMR
CLK
nCLK
GND
VCC
CROSS POINTS
F
IGURE
1B - LVPECL D
IFFERENTIAL
I
NPUT
L
EVEL
GND
VCC
F
IGURE
1C- LVCMOS
AND
LVTTL S
INGLE
E
NDED
I
NPUT
L
EVEL
CLK
or
nCLK
Integrated
Circuit
Systems, Inc.
ICS8501
L
OW
S
KEW
1-
TO
-16 D
IFFERENTIAL
C
URRENT
M
ODE
F
ANOUT
B
UFFER
8501
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REV. A - AUGUST 23, 2000
5
F
IGURE
2A
-
T
IMING
W
AVEFORMS
CLK
nCLK
Q0 thru Q15
nQ0 thru nQ15
tPHL
tPLH
Vpp
F
IGURE
3A - P
ROPAGATION
D
ELAYS
fin = 250MHz, Vpp = 300mV, tr = tf = 200ps
F
IGURE
3A - O
UTPUT
S
KEW
D
EFINITION
& W
AVEFORMS
Output Skew - Skew between any outputs. Outputs operating at the same temperature, supply voltages and with equal load
conditions.
CLK
nCLK
Q0
nQ0
Q1 thru Q15
nQ1 thru nQ15
tsk(o)
tsk(o)
F
IGURE
3A - O
UTPUT
S
KEW
fin = 250MHz, Vpp = 300mV, tr = tf = 200ps
Vpp
CROSS POINTS
CROSS POINTS
Integrated
Circuit
Systems, Inc.
ICS8501
L
OW
S
KEW
1-
TO
-16 D
IFFERENTIAL
C
URRENT
M
ODE
F
ANOUT
B
UFFER
8501
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REV. A - AUGUST 23, 2000
6
F
IGURE
3B - P
ART
-
TO
-P
ART
S
KEW
D
EFINITION
& W
AVEFORMS
Part-to-Part Skew - Skew between any outputs on different parts. Outputs operating at the same temperature, supply voltages
and with equal load conditions.
CLK
nCLK
PART 1 Q0
nQ0
PART 2 Q1 thru Q15
nQ1 thru nQ15
tsk(o)
tsk(o)
F
IGURE
3B - P
ART
-
TO
-P
ART
S
KEW
fin = 250MHz, Vpp = 300mV, tr = tf = 200ps
Vpp
CROSS POINTS
CROSS POINTS
Integrated
Circuit
Systems, Inc.
ICS8501
L
OW
S
KEW
1-
TO
-16 D
IFFERENTIAL
C
URRENT
M
ODE
F
ANOUT
B
UFFER
8501
www.icst.com
REV. A - AUGUST 23, 2000
7
D
D/2
E
E/2
D1
D1/2
E1
E1/2
-A-
e
-D-
-B-
SEE DETAIL "A"
0.20 C A-B D
4X
NOTE 3
NOTE 3
NOTE 3
NOTE 4
N
O
T
E
4
N
O
T
E
5,
7
NOTE 5, 7
N/4 T IPS
D
D/2
E
E/2
D1
D1/2
E1
E1/2
-A-
e
-D-
-B-
SEE DETAIL "A"
0.20 C A-B D
4X
0.20 C A-B D
0.20 C A-B D
4X
NOTE 3
NOTE 3
NOTE 3
NOTE 4
N
O
T
E
4
N
O
T
E
5,
7
NOTE 5, 7
N/4 T IPS
ddd M C A-B S D S
b
b
1
0.09 / 0.20
0.09 / 0.16
BASE METAL
WIT H LEAD FINISH
SEE DETAIL "B"
ccc
8 PLACES
11 / 13
-C-
-H-
A
NOT E 2 / / 0.10 C
NOTE 9
ddd M C A-B S D S
b
b
1
0.09 / 0.20
0.09 / 0.16
BASE METAL
WIT H LEAD FINISH
SEE DETAIL "B"
ccc
8 PLACES
11 / 13
-C-
-H-
A
NOT E 2 / / 0.10 C
NOTE 9
-A, B, OR -D-
e / 2
-A, B, OR -D-
b
-A, B, OR -D-
e / 2
-A, B, OR -D-
b
NOTES:
1.
ALL DIMENSIONS AND TOLERANCING CONFORM TO ANSI
Y14.5-1982
2.
DATUM PLANE -H- LOCATED AT MOLD PARTING LINE AND
COINCIDENT WITH LEAD, WHERE LEAD EXITS PLASTIC BODY
AT BOTTOM OF PARTING LINE.
3.
DATUMS A-B AND -D- TO BE DETERMINED AT CENTERLINE
BETWEEN LEADS WHERE LEADS EXIT PLASTIC AT DATUM
PLANE -H- .
4.
TO BE DETERMINED AT SEATING PLACE -C- .
5.
DIMENSIONS D1 AND E1 DO NOT INCLUDE MOLD
PROTRUSION.
6.
"N" IS THE TOTAL NUMBER OF TERMINALS.
7.
THESE DIMENSIONS TO BE DETEREMINED AT DATUM PLANE
-H-.
8.
PACKAGE TOP DIMENSIONS ARE SMALLER THAN BOTTOM
DIMENSIONS AND TOP OF PACKAGE WILL NOT OVERHANG
BOTTOM OF PACKAGE.
9.
DIMENSION b DOES NOT INCLUDE DAMBAR PROTRUSION.
ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08mm TOTAL
IN EXCESS OF THE b DIMENSION AT MAXIMUM MATERIAL
CONDITION.
10.
CONTROLLING DIMENSION: MILLIMETER.
11.
THIS OUTLINE CONFORMS TO JEDEC PUBLIBCATION 95
REGISTRATION MS-026, VARIATION BBC.
12.
A1 IS DEFINED AS THE DISTANCE FROM THE SEATING PLANE
TO THE LOWEST POINT OF THE PACKAGE.
S
Y
M
B
O
L
A
A
1
A
2
D
D
1
E
E
1
L
N
e
b
b1
ccc
ddd
JEDEC VARIATION
ALL DIMENSIONS IN MILLIMETERS
BBC
MIN.
NOM.
MAX.
1.60
0.05
0.15
1.35
1.40
1.45
9.00 BSC.
7.00 BSC.
9.00 BSC.
7.00 BSC.
0.45
0.60
0.75
48
0.5 BSC.
0.17
0.22
0.27
0.17
0.20
0.23
0.08
0.08
N
O
T
E
12
4
7, 8
4
7, 8
9
S
Y
M
B
O
L
A
A
1
A
2
D
D
1
E
E
1
L
N
e
b
b1
ccc
ddd
JEDEC VARIATION
ALL DIMENSIONS IN MILLIMETERS
BBC
MIN.
NOM.
MAX.
1.60
0.05
0.15
1.35
1.40
1.45
9.00 BSC.
7.00 BSC.
9.00 BSC.
7.00 BSC.
0.45
0.60
0.75
48
0.5 BSC.
0.17
0.22
0.27
0.17
0.20
0.23
0.08
0.08
N
O
T
E
12
4
7, 8
4
7, 8
9
0.25
0 MIN.
0 - 7
0.08
R. MIN.
0.20 MIN.
L
0.08/0.20 R.
GAUGE PLANE
1.00 REF.
-H-
A2
A1
DATUM
PLANE
- 0.05 S
0.25
0 MIN.
0 - 7
0.08
R. MIN.
0.20 MIN.
L
0.08/0.20 R.
GAUGE PLANE
1.00 REF.
-H-
A2
A1
DATUM
PLANE
- 0.05 S
- 0.05 S
P
ACKAGE
O
UTLINE
AND
D
IMENSIONS
- Y S
UFFIX
Integrated
Circuit
Systems, Inc.
ICS8501
L
OW
S
KEW
1-
TO
-16 D
IFFERENTIAL
C
URRENT
M
ODE
F
ANOUT
B
UFFER
8501
www.icst.com
REV. A - AUGUST 23, 2000
8
r
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b
m
u
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d
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1
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C
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1
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0
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0
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1
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5
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S
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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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