ICST ICS8501BYT Low skew 1-to-16 differential current mode fanout buffer Datasheet

ICS8501
Integrated
Circuit
Systems, Inc.
LOW SKEW 1-TO-16 DIFFERENTIAL
CURRENT MODE FANOUT BUFFER
FEATURES
GENERAL DESCRIPTION
• 16 small swing DCM outputs
The ICS8501 is a low skew, 1-to-16 Differential
Current Mode Fanout Buffer and a member of
HiPerClockS™ the HiPerClockS™ family of High Performance
Clock Solutions from ICS. The ICS8501 is designed 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 resistor. The load resistor value is chosen to equal the value of
the characteristic line impedance of 50Ω. The ICS8501 is characterized at an operating supply voltage of 3.3V.
,&6
• 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
The small swing outputs, accurate crossover voltage and duty
cycle makes the ICS8501 ideal for interfacing to today’s most
advanced microprocessors.
• 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
• 0°C to 70°C ambient operating temperature
BLOCK DIAGRAM
PIN A SSIGNMENT
Q0
nQ0
Q15
nQ15
Q1
nQ1
Q14
nQ14
Q2
nQ2
Q13
nQ13
Q3
nQ3
Q12
nQ12
Q4
nQ4
Q11
nQ11
Q5
nQ5
Q10
nQ10
Q6
nQ6
Q9
nQ9
Q7
nQ7
Q8
nQ8
VCC
Q11
nQ11
Q10
nQ10
GND
Q9
nQ9
Q8
nQ8
VCC
nc
48 47 46 45 44 43 42 41 40 39 38 37
1
36
2
35
3
34
4
33
5
32
6
31
7
30
8
29
9
28
10
27
11
26
12
25
13 14 15 16 17 18 19 20 21 22 23 24
ICS8501
CLK
VCC
nQ0
Q0
nQ1
Q1
GND
nQ2
Q2
nQ3
Q3
VCC
VCC
nQ4
Q4
nQ5
Q5
GND
nQ6
Q6
nQ7
Q7
VCC
RREF
8501
nCLK
VCC
Q15
nQ15
Q14
nQ14
GND
Q13
nQ13
Q12
nQ12
VCC
CLK
nCLK
48-Lead LQFP
Y Package
Top View
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1
REV. A - AUGUST 23, 2000
ICS8501
Integrated
Circuit
Systems, Inc.
LOW SKEW 1-TO-16 DIFFERENTIAL
CURRENT MODE FANOUT BUFFER
TABLE 1. PIN DESCRIPTIONS
Number
1, 11,
14, 24,
25, 35,
38, 48
Name
Ty pe
Description
VCC
Pow er
Pow er supply pin. Connect to 3.3V.
2, 3
Q11, nQ11
Output
Differential output. Differential current mode interface levels.
4, 5
Q10, nQ10
Output
Differential output. Differential current mode interface levels.
6, 19,
30, 43
GND
Pow er
Pow er supply pin. Connect to ground.
7, 8
Q9, nQ9
Output
Differential output. Differential current mode interface levels.
9, 10
Q8, nQ8
Output
Differential output. Differential current mode interface levels.
12
nc
Unused
13
RREF
Input
15, 16
Q7, nQ7
Output
No connection.
Reference current input. Used to set the output current. Connect to 475Ω
resistor to ground.
Differential output. Differential current mode interface levels.
17, 18
Q6, nQ6
Output
Differential output. Differential current mode interface levels.
20, 21
Q5, nQ5
Output
Differential output. Differential current mode interface levels.
22, 23
Q4, nQ4
Output
Differential output. Differential current mode interface levels.
26, 27
Q3, nQ3
Output
Differential output. Differential current mode interface levels.
28, 29
Q2, nQ2
Output
Differential output. Differential current mode interface levels.
36
CLK
Input
Non inverting differential clock input. Any differential input interface levels.
37
nCLK
Input
Inverting differential clock input. Any differential input interface levels.
39, 40
Q15, nQ15
Output
Differential output. Differential current mode interface levels.
41, 42
Q14, nQ14
Output
Differential output. Differential current mode interface levels.
44, 45
Q13, nQ13
Output
Differential output. Differential current mode interface levels.
46, 47
Q12, nQ12
Output
Differential output. Differential current mode interface levels.
TABLE 2. PIN CHARACTERISTICS
Sy mbol
Parameter
CIN
Input Capacitance
Pow er Dissipation Capacitance
(per output)
Output Impedance
CPD
ROUT
Test Conditions
VCC = 3.465V, f=250MHz
Minimum
Ty pical
Maximum
Units
2
pF
4.6
pF
14
KΩ
TABLE 3. FUNCTION TABLE
Inputs
Outputs
CLK
nCLK
Q0 thru Q15
nQ0 thru nQ15
0
1
0
1
Input to Output Mode
Polarity
Differential to Differential
Non Inverting
1
0
1
0
Differential to Differential
Non Inverting
0
Biased; NOTE 1
0
1
Single Ended to Differential
Non Inverting
1
Biased; NOTE 1
1
0
Single Ended to Differential
Non Inverting
Biased; NOTE 1
0
1
0
Single Ended to Differential
Inverting
Biased; NOTE 1
1
0
1
Single Ended to Differential
Inverting
NOTE 1: Single ended use requires that one of the differential inputs be biased. The voltage at the biased input sets the sw itch point for the
single ended input. For LVCMOS and LVTTL levels the recommended input bias netw ork is a resistor to VCC, a resistor of equal value to
ground and a 0.1µF capacitor from the input to ground. The resulting sw itch point is approximately VCC/2 ± 300mV.
8501
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2
REV. A - AUGUST 23, 2000
ICS8501
Integrated
Circuit
Systems, Inc.
LOW SKEW 1-TO-16 DIFFERENTIAL
CURRENT MODE FANOUT BUFFER
A BSOLUTE MAXIMUM RATINGS
Supply Voltage
Inputs
Outputs
Ambient Operating Temperature
Storage Temperature
4.6V
-0.5V to VCC+0.5 V
-0.5V to VCC+0.5V
0°C to 70°C
-65°C to 150°C
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.
TABLE 4. DC ELECTRICAL CHARACTERISTICS, VCC = 3.3V±5%, TA = 0°C TO 70°C
Sy mbol
Parameter
VCC
Operating Supply Voltage
Test Conditions
VPP
Peak-to-Peak Input Voltage
VCMR
Common Mode Input Voltage;
NOTE 1
IIH
Input High Current
CLK, nCLK
VIN = VCC
CLK, nCLK
VIN = 0V
IIL
Input Low Current
ICC
Operating Supply Current
IOH
Output Current; NOTE 2
VOH
Output High Voltage
Minimum
Ty pical
Maximum
Units
3.135
3.3
3.465
V
0.31
1.3
V
LVPECL Levels
1.8
2.4
V
DCM, HSTL, LVDS, SSTL Levels
0.31
1.3
V
5
µA
70
mA
-5
µA
3.135V ≤ VCC ≤ 3.465V
11
14
17
mA
RREF = 475Ω , RLOAD = 50Ω
0.6
0.71
1.2
V
VOL
Output Low Voltage
RREF = 475Ω , RLOAD = 50Ω
0
0.05
V
NOTE 1: Common mode input voltage for LVPECL is defined as the minimum VIH. The LVPECL values noted in Table 4A are for VCC = 3.3V.
VCMR for LVPECL w ill vary 1:1 w ith VCC. Common mode input voltage for DCM, HSTL, LVDS and SSTL is defined as the crossover
voltage. See Figure 1A and 1B.
NOTE 2: IOH is the current per output being supplied to the load and should be included in the total supply current calculation. Therefore
ICC(total) is equal to IOH times 16 plus ICC.
TABLE 5. AC ELECTRICAL CHARACTERISTICS, VCC = 3.3V±5%, TA = 0°C TO 70°C
Sy mbol
Parameter
tpLH
Propagation Delay, Low -to-High
Test Conditions
Measured at the -3dB rolloff of the
peak-to-peak output voltage
0 < f ≤ 250MHz
fMAX
Maximum Input Frequency
tpHL
Propagation Delay, High-to-Low
0 < f ≤ 250MHz
tsk(o)
Output Skew ; NOTE 3
Measured on at VOX
Measured on at VOX
Minimum
Ty pical
Maximum
Units
500
MHz
2
3
ns
2
3
ns
100
ps
tsk(pp)
Part-to-Part Skew ; NOTE 4
650
ps
tR
Output Rise Time
20% to 80%
175
700
ps
tF
Output Fall Time
20% to 80%
Output Pulse Width
700
tCY CLE/2
+ 0.3
60% VOH
ps
tPW
175
tCY CLE/2
- 0.3
40% VOH
VOX
NOTE 1:
NOTE 2:
NOTE 3:
NOTE 4:
8501
tCY CLE/2
ns
Output Crossover Voltage
V
All parameters measured at 250MHz unless noted otherw ise.
RREF equals 475Ω . Outputs terminated w ith 50Ω resistor connected to ground.
Defined as skew across outputs at the same supply voltages and w ith equal load conditions.
Defined as skew at different outputs on different devices operating at the same supply voltages and w ith equal load conditions.
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3
REV. A - AUGUST 23, 2000
ICS8501
Integrated
Circuit
Systems, Inc.
LOW SKEW 1-TO-16 DIFFERENTIAL
CURRENT MODE FANOUT BUFFER
FIGURE 1A, 1B, 1C - INPUT CLOCK WAVEFORMS
VCC
CLK
CROSS POINTS
VPP
VCMR
nCLK
GND
FIGURE 1A - DCM, LVDS, HSTL, SSTL DIFFERENTIAL INPUT LEVELS
VCC
CLK
CROSS POINTS
VPP
VCMR
nCLK
GND
FIGURE 1B - LVPECL DIFFERENTIAL INPUT LEVEL
VCC
CLK
or
nCLK
GND
FIGURE 1C- LVCMOS AND LVTTL SINGLE ENDED INPUT LEVEL
8501
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4
REV. A - AUGUST 23, 2000
ICS8501
Integrated
Circuit
Systems, Inc.
FIGURE 2A
LOW SKEW 1-TO-16 DIFFERENTIAL
CURRENT MODE FANOUT BUFFER
- TIMING WAVEFORMS
CLK
Vpp
nCLK
tPHL
tPLH
Q0 thru Q15
nQ0 thru nQ15
FIGURE 3A - PROPAGATION DELAYS
fin = 250MHz, Vpp = 300mV, tr = tf = 200ps
FIGURE 3A - OUTPUT SKEW DEFINITION & WAVEFORMS
Output Skew - Skew between any outputs. Outputs operating at the same temperature, supply voltages and with equal load
conditions.
CLK
Vpp
nCLK
Q0
CROSS POINTS
nQ0
tsk(o)
tsk(o)
Q1 thru Q15
CROSS POINTS
nQ1 thru nQ15
FIGURE 3A - OUTPUT SKEW
fin = 250MHz, Vpp = 300mV, tr = tf = 200ps
8501
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5
REV. A - AUGUST 23, 2000
ICS8501
Integrated
Circuit
Systems, Inc.
LOW SKEW 1-TO-16 DIFFERENTIAL
CURRENT MODE FANOUT BUFFER
FIGURE 3B - PART-TO-PART SKEW DEFINITION & WAVEFORMS
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
Vpp
nCLK
PART 1
Q0
CROSS POINTS
nQ0
PART 2
tsk(o)
tsk(o)
Q1 thru Q15
CROSS POINTS
nQ1 thru nQ15
FIGURE 3B - PART-TO-PART SKEW
fin = 250MHz, Vpp = 300mV, tr = tf = 200ps
8501
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6
REV. A - AUGUST 23, 2000
ICS8501
Integrated
Circuit
Systems, Inc.
LOW SKEW 1-TO-16 DIFFERENTIAL
CURRENT MODE FANOUT BUFFER
PACKAGE OUTLINE AND DIMENSIONS - Y SUFFIX
e /2
NOTE 4
D
NOTE 5, 7
D1
D/2
NOTE 3
-D-
-A, B, OR -D-
D1/2
b
NOTE 3
-B-
NOTE 3
-A-
E1
-A, B, OR -D-
N
O
T
E
4
E/2
N/4 T IPS
0.20 C A-B D
4X
E
N
O
T
E
5,
7
e
E1/2
SEE DETAIL “A”
8 PLACES
11 / 13°
A
-H- NOT E 2 / / 0.10 C
ccc
-CSEE DETAIL “B”
NOTE 9
ddd M C A-B S D S
0.09 / 0.20
S
Y
M
B
O
L
WIT H LEAD FINISH
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.
0.09 / 0.16
JEDEC VARIATION
ALL DIMENSIONS IN MILLIMETERS
BBC
MIN.
NOM.
A
b1
BASE METAL
0° MIN.
- 0.05 S
A2
0.08/0.20 R.
DATUM
PLANE
-H-
0.05
A2
1.35
0.08
R. MIN.
0.20 MIN.
L
1.00 REF.
8501
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7
12
1.45
D
9.00 BSC.
4
7.00 BSC.
7, 8
E
9.00 BSC.
4
E1
7.00 BSC.
7, 8
0.45
0.60
0.75
48
N
0° - 7 °
0.15
1.40
D1
e
A1
MAX.
1.60
A1
L
0.25
GAUGE PLANE
N
O
T
E
0.5 BSC.
b
0.17
0.22
0.27
b1
0.17
0.20
0.23
ccc
0.08
ddd
0.08
9
REV. A - AUGUST 23, 2000
ICS8501
Integrated
Circuit
Systems, Inc.
LOW SKEW 1-TO-16 DIFFERENTIAL
CURRENT MODE FANOUT BUFFER
ORDERING INFORMATION
Part/Order Number
Marking
Package
Count
ICS8501BY
ICS8501BY
48 Lead LQFP
250 per tray
Temperature
0°C to 70°C
ICS8501BY T
ICS8501BY
48 Lead LQFP on Tape and Reel
2000
0°C to 70°C
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.
8501
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8
REV. A - AUGUST 23, 2000
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