ICS8530DY-01
www.icst.com/products/hiperclocks.html
REV. B AUGUST 8, 2001
1
Integrated
Circuit
Systems, Inc.
ICS8530-01
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-3.3V LVPECL F
ANOUT
B
UFFER
B
LOCK
D
IAGRAM
P
IN
A
SSIGNMENT
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
HiPerClockSTM
,&6
F
EATURES
16 differential 3.3V LVPECL outputs
CLK, nCLK input pair
CLK, nCLK pair can accept the following differential input
levels: LVDS, LVPECL, LVHSTL, SSTL, HCSL
Maximum output frequency up to 500MHz
Translates any single-ended input signal to 3.3V LVPECL
levels with a resistor bias on nCLK input
Output skew: 75ps (maximum)
Part-to-part skew: 250ps (maximum)
3.3V output operating supply
0C to 70C ambient operating temperature
Industrial temperature information available upon request
G
ENERAL
D
ESCRIPTION
The ICS8530-01 is a low skew, 1-to-16 Differen-
tial-to-3.3V LVPECL Fanout Buffer and a mem-
ber of the HiPerClockSTM family of High Perfor-
mance Clock Solutions from ICS. The CLK, nCLK
pair can accept most standard differential input
levels. The high gain differential amplifier accepts peak-to-
peak input voltages as small as 150mV as long as the com-
mon mode voltage is within the specified minimum and maxi-
mum range.
Guaranteed output and part-to-part skew characteristics
make the ICS8530-01 ideal for those clock distribution appli-
cations demanding well defined performance and repeatabil-
ity.
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
CCO
Q11
nQ11
Q10
nQ10
V
EE
Q9
nQ9
Q8
nQ8
V
CCO
V
CC
CLK
V
CCO
nQ0
Q0
nQ1
Q1
V
EE
nQ2
Q2
nQ3
Q3
Vcco
nCLK
V
CCO
Q15
nQ15
Q14
nQ14
V
EE
Q13
nQ13
Q12
nQ12
V
CCO
ICS8530-01
V
CCO
nQ4
Q4
nQ5
Q5
V
EE
nQ6
Q6
nQ7
Q7
V
CCO
V
CC
48-Pin LQFP
7mm x 7mm x 1.4mm package body
Y Package
Top View
ICS8530DY-01
www.icst.com/products/hiperclocks.html
REV. B AUGUST 8, 2001
2
Integrated
Circuit
Systems, Inc.
ICS8530-01
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-3.3V LVPECL 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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ICS8530DY-01
www.icst.com/products/hiperclocks.html
REV. B AUGUST 8, 2001
3
Integrated
Circuit
Systems, Inc.
ICS8530-01
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-3.3V LVPECL F
ANOUT
B
UFFER
T
ABLE
4A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= V
CCO
= 3.3V5%, T
A
= 0C
TO
70C
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
CCx
4.6V
Inputs, V
I
-0.5V to V
CC
+ 0.5V
Outputs, V
O
-0.5V to V
CCO
+ 0.5V
Package Thermal Impedance,
JA
47.9C/W
Storage Temperature, T
STG
-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 peri-
ods may affect product reliability.
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HARACTERISTICS
,
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CCO
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-
ICS8530DY-01
www.icst.com/products/hiperclocks.html
REV. B AUGUST 8, 2001
4
Integrated
Circuit
Systems, Inc.
ICS8530-01
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-3.3V LVPECL F
ANOUT
B
UFFER
T
ABLE
5. AC C
HARACTERISTICS
,
V
CC
= V
CCO
= 3.3V5%, T
A
= 0C
TO
70C
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ICS8530DY-01
www.icst.com/products/hiperclocks.html
REV. B AUGUST 8, 2001
5
Integrated
Circuit
Systems, Inc.
ICS8530-01
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-3.3V LVPECL F
ANOUT
B
UFFER
P
ARAMETER
M
EASUREMENT
I
NFORMATION
F
IGURE
1 - O
UTPUT
L
OAD
T
EST
C
IRCUIT
SCOPE
Qx
nQx
LVPECL
V
CC
= 2V 5%
V
CCO
= 2V 5%
V
CC
V
CCO
V
EE
= -1.3V 0.135V
F
IGURE
2 - D
IFFERENTIAL
I
NPUT
L
EVEL
V
CMR
Cross Points
V
PP
CLK
nCLK
V
EE
V
CC
F
IGURE
3 - O
UTPUT
S
KEW
tsk(o)
Qx
nQx
Qy
nQy
ICS8530DY-01
www.icst.com/products/hiperclocks.html
REV. B AUGUST 8, 2001
6
Integrated
Circuit
Systems, Inc.
ICS8530-01
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-3.3V LVPECL F
ANOUT
B
UFFER
F
IGURE
7 - odc & t
P
ERIOD
Pulse Width
t
PERIOD
t
PW
t
PERIOD
odc =
CLK, Qx
nCLK, nQx
F
IGURE
6 - P
ROPAGATION
D
ELAY
t
PD
CLK
nCLK
Q0 - Q15
nQ0 - nQ15
F
IGURE
4 - P
ART
-
TO
-P
ART
S
KEW
Qx
nQx
Qy
nQy
PART 1
PART 2
tsk(pp)
F
IGURE
5 - I
NPUT
AND
O
UTPUT
R
ISE
AND
F
ALL
T
IME
Clock Inputs
and Outputs
20%
80%
20%
80%
t
R
t
F
V
S W I N G
ICS8530DY-01
www.icst.com/products/hiperclocks.html
REV. B AUGUST 8, 2001
7
Integrated
Circuit
Systems, Inc.
ICS8530-01
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-3.3V LVPECL F
ANOUT
B
UFFER
A
PPLICATION
I
NFORMATION
W
IRING
THE
D
IFFERENTIAL
I
NPUT
TO
A
CCEPT
S
INGLE
E
NDED
L
EVELS
Figure 8 shows how the differential input can be wired to accept single ended levels. The reference voltage V_REF ~ V
CC
/2 is
generated by the bias resistors R1, R2 and C1. This bias circuit should be located as close as possible to the input pin. The ratio of
R1 and R2 might need to be adjusted to position the V_REF in the center of the input voltage swing. For example, if the input clock
swing is only 2.5V and V
CC
= 3.3V, V_REF should be 1.25V and R2/R1 = 0.609.
F
IGURE
8 - S
INGLE
E
NDED
S
IGNAL
D
RIVING
D
IFFERENTIAL
I
NPUT
R2
1K
V
CC
CLK_IN
+
-
R1
1K
C1
0.1uF
V_REF
ICS8530DY-01
www.icst.com/products/hiperclocks.html
REV. B AUGUST 8, 2001
8
Integrated
Circuit
Systems, Inc.
ICS8530-01
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-3.3V LVPECL F
ANOUT
B
UFFER
P
OWER
C
ONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS8530-01.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS8530-01 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for V
CC
= 3.3V + 5% = 3.465V, which gives worst case results.
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
Power (core)
MAX
= V
CC_MAX
* I
EE_MAX
= 3.465V * 120mA = 415.8mW
Power (outputs)
MAX
= 30.2mW/Loaded Output pair
If all outputs are loaded, the total power is 16 * 30.2mW = 483.2mW
Total Power
_MAX
(3.465V, with all outputs switching) = 415.8mW + 483.2mW = 899mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the
device. The maximum recommended junction temperature for HiPerClockS
TM
devices is 125C.
The equation for Tj is as follows: Tj =
JA
* Pd_total + T
A
Tj = Junction Temperature
JA
= junction-to-ambient thermal resistance
Pd_total = Total device power dissipation (example calculation is in section 1 above)
T
A
= Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance
JA
must be used
. Assuming a
moderate air flow of 200 linear feet per minute and a multi-layer board, the appropriate value is 47.9C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 70C with all outputs switching is:
70C + 0.899W * 47.9C/W = 113.1C. This is well below the limit of 125C
This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow,
and the type of board (single layer or multi-layer).
q
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.
Table 6. Thermal Resistance
q
JA
for 48-pin LQFP, Forced Convection
ICS8530DY-01
www.icst.com/products/hiperclocks.html
REV. B AUGUST 8, 2001
9
Integrated
Circuit
Systems, Inc.
ICS8530-01
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-3.3V LVPECL F
ANOUT
B
UFFER
3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
LVPECL output driver circuit and termination are shown in
Figure 9.
T
o calculate worst case power dissipation into the load, use the following equations which assume a 50
load, and a termination
voltage of V
CC
- 2V.
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(V
OH_MAX
(V
CC_MAX
- 2V))/R
L
]*(V
CC_MAX
- V
OH_MAX
)
Pd_L = [(V
OL_MAX
(V
CC_MAX
- 2V))/R
L
]*(V
CC_MAX
- V
OL_MAX
)
For logic high, V
OUT
= V
OH_MAX
= V
CC_MAX
1.0V
Using V
CC_MAX
= 2.625, this results in V
OH_MAX
= 1.625V
For logic low, V
OUT
= V
OL_MAX
= V
CC_MAX
1.7V
Using V
CC_MAX
= 2.625, this results in V
OL_MAX
= 0.925V
Pd_H = [(1.625V - (2.625V - 2V))/50
]*(1V) = 20mW
Pd_L = [(0.925V - (2.625V - 2V))/50
]*(1.7) = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30.2mW
F
IGURE
9 - LVPECL D
RIVER
C
IRCUIT
AND
T
ERMINATION
Q1
V
OUT
V
CCO
R L
50
V
CCO
- 2V
ICS8530DY-01
www.icst.com/products/hiperclocks.html
REV. B AUGUST 8, 2001
10
Integrated
Circuit
Systems, Inc.
ICS8530-01
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-3.3V LVPECL F
ANOUT
B
UFFER
R
ELIABILITY
I
NFORMATION
T
RANSISTOR
C
OUNT
The transistor count for ICS8530-01 is: 930
T
ABLE
7.
JA
VS
. A
IR
F
LOW
T
ABLE
q
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.
ICS8530DY-01
www.icst.com/products/hiperclocks.html
REV. B AUGUST 8, 2001
11
Integrated
Circuit
Systems, Inc.
ICS8530-01
L
OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
-
TO
-3.3V LVPECL F
ANOUT
B
UFFER
P
ACKAGE
O
UTLINE
- Y S
UFFIX
T
ABLE
8. P
ACKAGE
D
IMENSIONS
Reference Document: JEDEC Publication 95, MS-026
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ICS8530DY-01
www.icst.com/products/hiperclocks.html
REV. B AUGUST 8, 2001
12
Integrated
Circuit
Systems, Inc.
ICS8530-01
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OW
S
KEW
, 1-
TO
-16
D
IFFERENTIAL
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TO
-3.3V LVPECL F
ANOUT
B
UFFER
T
ABLE
9. 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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