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8520DY
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 12, 2002
1
Integrated
Circuit
Systems, Inc.
ICS8520
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-LVHSTL F
ANOUT
B
UFFER
G
ENERAL
D
ESCRIPTION
The ICS8520 is a low skew, high performance
1-to-16 Differential-to-LVHSTL Fanout Buffer and
a member of the HiPerClockSTM family of
High Performance Clock Solutions from ICS. The
ICS8520 has 1 clock input pair. The CLK, nCLK
pair can accept most standard differential input levels.
Guaranteed output skew, part-to-part skew and crossover volt-
age characteristics make the ICS8520 ideal for interfacing to
today's most advanced microprocessor and static RAMs.
F
EATURES
16 differential LVHSTL compatible outputs
each with the ability to drive 50
to ground
1 differential CLK, nCLK input pair
CLK, nCLK pair can accept the following differential
input levels: LVDS, LVPECL, LVHSTL, SSTL, HCSL
Maximum output frequency: 500MHz
Translates single ended input levels to LVHSTL
levels with resistor bias nCLK input
Output skew: 110ps (maximum)
Part-to-part skew: 450ps (maximum)
Propagation delay: 1.6ns (maximum)
V
OH
: 1.3V (maximum)
40% of V
OH
Vcrossover
60% of V
OH
3.3V core, 1.8V output operating supply voltages
0C to 70C ambient operating temperature
B
LOCK
D
IAGRAM
P
IN
A
SSIGNMENT
HiPerClockSTM
,&6
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
V
DDO
Q11
nQ11
Q10
nQ10
GND
Q9
nQ9
Q8
nQ8
V
DDO
V
DD
CLK
V
DDO
nQ0
Q0
nQ1
Q1
GND
nQ2
Q2
nQ3
Q3
V
DDO
nCLK
V
DDO
Q15
nQ15
Q14
nQ14
GND
Q13
nQ13
Q12
nQ12
V
DDO
ICS8520
V
DDO
nQ4
Q4
nQ5
Q5
GND
nQ6
Q6
nQ7
Q7
V
DDO
V
DD
48-Lead LQFP
7mm x 7mm x 1.4mm body package
Y Package
Top View
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
8520DY
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 12, 2002
2
Integrated
Circuit
Systems, Inc.
ICS8520
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-LVHSTL F
ANOUT
B
UFFER
T
ABLE
1. P
IN
D
ESCRIPTIONS
T
ABLE
2. P
IN
C
HARACTERISTICS
T
ABLE
3. F
UNCTION
T
ABLE
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8520DY
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 12, 2002
3
Integrated
Circuit
Systems, Inc.
ICS8520
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-LVHSTL F
ANOUT
B
UFFER
T
ABLE
4A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
DD
= 3.3V5%, V
DDO
= 1.8V0.2V, T
A
= 0C
TO
70C
T
ABLE
4B. D
IFFERENTIAL
DC C
HARACTERISTICS
,
V
DD
= 3.3V5%, V
DDO
= 1.8V0.2V, T
A
= 0C
TO
70C
T
ABLE
4C. LVHSTL DC C
HARACTERISTICS
,
V
DD
= 3.3V5%, V
DDO
= 1.8V0.2V, T
A
= 0C
TO
70C
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t
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
DD
4.6V
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.
8520DY
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 12, 2002
4
Integrated
Circuit
Systems, Inc.
ICS8520
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-LVHSTL F
ANOUT
B
UFFER
T
ABLE
5. AC C
HARACTERISTICS
,
V
DD
= 3.3V5%, V
DDO
= 1.8V0.2V, T
A
= 0C
TO
70C
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8520DY
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 12, 2002
5
Integrated
Circuit
Systems, Inc.
ICS8520
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-LVHSTL F
ANOUT
B
UFFER
Clock Outputs
20%
80%
80%
20%
t
R
t
F
V
SW I N G
Pulse Width
t
PERIOD
t
PW
t
PERIOD
odc =
nQ0:nQ15
Q0:Q15
t
PD
nCLK
CLK
nQ0:nQ15
Q0:Q15
Qx
nQx
Qy
nQy
PART 1
PART 2
tsk(pp)
3.3V/1.8V O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
D
IFFERENTIAL
I
NPUT
L
EVEL
P
ART
-
TO
-P
ART
S
KEW
O
UTPUT
S
KEW
odc & t
P
ERIOD
O
UTPUT
R
ISE
/F
ALL
T
IME
P
ROPAGATION
D
ELAY
P
ARAMETER
M
EASUREMENT
I
NFORMATION
tsk(o)
nQx
Qx
nQy
Qy
V
CMR
Cross Points
V
PP
nCLK
CLK
GND
V
DD
SCOPE
LVHSTL
Qx
nQx
3.3V5%
V
DDO
V
DD
GND = 0V
1.8V0.2V