DATASHEET

11.1Gb/s Lane Extender
ISL36111
Features
The ISL36111 is a settable single-channel receive-side
equalizer with extended functionality for advanced protocols
operating with line rates up to 11.1Gb/s, such as 10G
Ethernet. The ISL36111 compensates for the frequency
dependent attenuation of copper twin-axial cables, extending
the signal reach up to at least 10m on 28AWG cable.
• Supports data rates up to 11.1Gb/s
The small form factor, highly-integrated design is ideal for
high-density data transmission applications including active
copper cable assemblies. The equalizing filter within the
ISL36111 can be set to provide optimal signal fidelity for a
given media and length. The compensation level for the filter is
set by two external control pins.
• Adjustable equalizer boost
Operating on a single 1.2V power supply, the ISL36111
enables channel throughputs of 10Gb/s to 11.1Gb/s while
supporting lower data rates including 8.5, 6.25, 5, 4.25, 3.125,
2.5 and 1 Gb/s. The ISL36111 uses current mode logic (CML)
input/output and is packaged in a 3mmx3mm 16 lead QFN.
The device supports LOS functionality for module applications.
Applications
• Low power (~110mW)
• Low latency (<500ps)
• Single channel equalizer in a 3mmx3mm QFN package for
straight route-through architecture and simplified routing
• Supports 64b/66b encoded data – long run lengths
• Line silence preservation
• 1.2V supply voltage
• Loss of Signal support
• SFP+ active copper cable modules
• QSFP active copper cable modules
• 10G Ethernet
• Fibre Channel
• High-speed active cable assemblies
• High-speed printed circuit board (PCB) traces
Benefits
• Thinner gauge cable
• Extends cable reach greater than 3x
• Improved BER
1.2V
LOS
0.1mF
0.1mF
CP-A CP-B
Vdd
0.1mF
OUT [P]
IN [P]
OUT [N]
IN [N]
ISL36111
QLx111VRx
GND
1.2V
DT
LOS
0.1mF
Vdd
DE-A DE-B
IN [P]
0.1mF
OUT [P]
ISL35111
QLx111VTx
0.1mF
IN [N]
TDSBL GND
OUT [N]
DT
FIGURE 1. TYPICAL CABLE APPLICATION DIAGRAM
July 19, 2012
FN6974.2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2009, 2010, 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
ISL36111
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL36111DRZ-TS
6111
0 to +85
16 Ld QFN (7’’ 100 pcs.)
L16.3x3B
ISL36111DRZ-T7
6111
0 to +85
16 Ld QFN (7” 1k pcs.)
L16.3x3B
NOTES:
1. “-TS” and “-T7” suffix is for Tape and Reel. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL36111. For more information on MSL please see techbrief TB363.
Pin Configuration
GND
DT
NC
GND
ISL36111
(16 LD QFN)
TOP VIEW
16
15
14
13
VDD 1
12 VDD
IN[P] 2
11 OUT[P]
IN[N] 3
10 OUT[N]
LOSB 4
5
6
7
8
GND
CPA
CPB
GND
9
VDD
Pin Descriptions
PIN NAME
PIN NUMBER
DESCRIPTION
VDD
1, 9, 12
IN[P,N]
2, 3
Equalizer differential input, CML. The use of 100nF low ESL/ESR MLCC capacitor with at least 6GHz frequency
response is recommended.
LOSB
4
LOS BAR indicator. Low output when input signal is below DT threshold. This pin is internally pulled HIGH with
an 11kΩ resistor.
CP[A,B]
6, 7
Control pins for setting equalizer boost level. Tri-state inputs. Pins are read as a 2-digit number to set the boost
level. A is the MSB, and B is the LSB.
GND
5, 8, 13, 16
OUT[P,N]
11, 10
Equalizer differential output, CML. The use of 100nF low ESL/ESR MLCC capacitor with at least 6GHz frequency
response is recommended.
DT
15
Detection Threshold. Reference DC voltage threshold for input signal power detection. Data output OUT[P,N] is
muted when the power of the input signal IN[P,N] falls below the threshold. Tie to ground to disable electrical idle
preservation and always enable the output driver.
Exposed Pad
-
Exposed pad. For proper electrical and thermal performance, this pad should be connected to the PCB ground
plane.
Power supply. 1.2V supply voltage. The use of parallel 100pF and 47nF decoupling capacitors to ground is
recommended for each of these pins for broad high-frequency noise suppression.
2
These pins must be grounded.
FN6974.2
July 19, 2012
ISL36111
Absolute Maximum Ratings
Thermal Information
Supply Voltage (VDD to GND). . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 1.5V
Voltage at All Input Pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 1.5V
ESD Rating
High-Speed Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5kV (HBM)
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2kV (HBM)
Thermal Resistance (Typical)
θJA (°C/W) θJC (°C/W)
16 Ld QFN Package (Notes 4, 5) . . . . . . . .
56
10
Operating Ambient Temperature Range . . . . . . . . . . . . . . . . 0°C to +85°C
Storage Ambient Temperature Range . . . . . . . . . . . . . . . .-55°C to +150°C
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+125°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTE:
4. θJA measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech Brief
TB379.
5. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
Operating Conditions
PARAMETER
SYMBOL
Supply Voltage
Operating Ambient Temperature
MIN
TYP
MAX
UNITS
VDD
1.1
1.2
1.3
V
TA
0
25
85
°C
11.1
Gb/s
Bit Rate
CONDITION
NRZ data applied to any channel
Control Pin Characteristics
PARAMETER
1
VDD = 1.2V, TA = +25°C, and VIN = 600mVP-P, unless otherwise noted.
SYMBOL
MIN
MAX
(Note 14) TYP (Note 14) UNITS
CONDITION
Output LOW Logic Level
VOL
LOSB
0
Output HIGH Logic Level
VOH
LOSB
1000
Input Current
0
250
mV
VDD
mV
100
µA
MAX
(Note 14) UNITS
NOTES
Current draw on boost control pin, i.e., CP[A,B]
Electrical Specifications
PARAMETERS
30
VDD = 1.2V, TA = +25°C, and VIN = 600mVP-P, unless otherwise noted.
SYMBOL
Supply Current
IDD
Cable Input Amplitude Range
VIN
CONDITION
MIN
(Note 14)
92
Measured differentially at data source before
encountering channel loss; Up to 10m 28AWG
standard twin-axial cable (approx. -27dB @ 5GHz)
600
DC Differential Input Resistance
Measured on input channel IN[P,N]
80
DC Single-Ended Input Resistance
Measured on input channel IN[P] or IN[N], with
respect to VDD.
40
SDD11
Input Return Loss Limit
(Differential)
100MHz to 4.1GHz
VOUT
Differential Output Impedance
mA
1600
mVP-P
100
120
Ω
50
60
Ω
Note 7
4.1GHz to 11.1GHz
Output Amplitude Range
TYP
Note 8
6
dB
7
dB
8
Measured differentially at OUT[P] and OUT[N]
with 50Ω load on both output pins
450
650
850
mVP-P
Measured on OUT[P,N]
80
105
120
Ω
Output Return Loss Limit
(Differential)
SDD22
100MHz to 4.1GHz
Note 7
dB
7
4.1GHz to 11.1GHz
Note 8
dB
8
Output Return Loss Limit (Common
Mode)
SCC22
100MHz to 2.5GHz
Note 9
dB
9
2.5GHz to 11.1GHz
-3
dB
10
3
FN6974.2
July 19, 2012
ISL36111
Electrical Specifications
PARAMETERS
VDD = 1.2V, TA = +25°C, and VIN = 600mVP-P, unless otherwise noted. (Continued)
SYMBOL
Output Residual Jitter
MIN
(Note 14)
CONDITION
10.3125Gbps; Up to 10m 28AWG standard twinaxial cable (approx. -27dB @ 5GHz)
tr, tf
Output Transition Time
Propagation Delay
TYP
MAX
(Note 14) UNITS
NOTES
0.35
UI
6, 11, 12
20% to 80%
32
ps
13
From IN to OUT
500
ps
NOTES:
6. The input pins IN[P,N] are DC biased to VDD. The specified cable input amplitude range is established by characterization and not production tested,
and is valid so long as the voltages at the input pins IN[P,N] do not violate the voltage ranges specified in “Absolute Maximum Ratings” on page 3.
7. Maximum Reflection Coefficient given by equation SDDXX(dB) = -12 + 2*√(f), with f in GHz. Established by characterization and not production tested.
8. Maximum Reflection Coefficient given by equation SDDXX(dB) = -6.3 + 13Log10(f/5.5), with f in GHz. Established by characterization and not
production tested.
9. Reflection Coefficient given by equation SCCXX(dB) < -7 + 1.6*f, with f in GHz. Established by characterization and not production tested.
10. Limits established by characterization and are not production tested.
11. Output residual jitter is the difference between the total jitter at the lane extender output and the total jitter of the transmitted signal (as measured
at the input to the channel). Total jitter (TJ) is DJpp + 14.1 x RJRMS
12. Measured using a PRBS 215-1 pattern. Deterministic jitter at the input to the lane extender is due to frequency-dependent, media-induced loss only.
13. Rise and fall times measured using a 2GHz clock with a 20ps edge rate.
14. Compliance to limits is assured by characterization and design.
Typical Performance Characteristics
Performance is measured using the test setup illustrated in Figure 2. The signal from the pattern generator is launched into the twin-ax
cable using an SMA adapter card. The chip evaluation board is connected to the output of the cable through another adapter card. The
ISL36111 output signal is then visualized on a scope to determine signal integrity parameters such as jitter.
Pattern
Generator
SMA
Adapter
Card
Ω Twin-Axial
100O
Cable
SMA
Adapter
Card
ISL36111 Eval
Board
Oscilloscope
FIGURE 2. DEVICE CHARACTERIZATION SET UP
FIGURE 3. ISL36111 10.3125Gb/s OUTPUT FOR A 10M 28AWG CABLE
4
FN6974.2
July 19, 2012
CPB
CPA
ISL36111
Limiting
Amplifier
IN[P]
Output
Driver
OUT[P]
Adjustable
Equalizer
IN[N]
OUT[N]
Signal
Detector
DT
LOSB
FIGURE 4. FUNCTIONAL BLOCK DIAGRAM OF THE ISL36111
Operation
The ISL36111 is an advanced lane-extender for high-speed
interconnects. A functional diagram of ISL36111 is shown in
Figure 4. In addition to a robust equalization filter to compensate
for channel loss and restore signal fidelity, the ISL36111
contains unique integrated features to preserve special signaling
protocols typically broken by other equalizers. The signal detect
function is used to mute the channel output when the input
signal falls below the level determined by the Detection
Threshold (DT) pin voltage. This function is intended to preserve
periods of line silence (“DC idle”). Furthermore, the output of the
Signal Detect/DT comparator is used as a loss of signal (LOSB)
indicator to indicate the absence of a received signal.
As illustrated in Figure 4, the core of the high-speed signal path
in the ISL36111 is a sophisticated equalizer followed by a
limiting amplifier. The equalizer compensates for skin loss,
dielectric loss, and impedance discontinuities in the
transmission channel. The equalizer is followed by a limiting
amplification stage that provides a clean output signal with full
amplitude swing and fast rise-fall times for reliable signal
decoding in a subsequent receiver.
Adjustable Equalization Boost
ISL36111 features a settable equalizer for custom signal
restoration. The flexibility of this adjustable compensation
architecture enables signal fidelity to be optimized based on a
given application, providing support for a wide variety of channel
characteristics and data rates ranging from 2.5Gb/s to
11.1Gb/s. Because the boost level is externally set rather than
internally adapted, the ISL36111 provides reliable
communication from the very first bit transmitted. There is no
time needed for adaptation and control loop convergence.
Furthermore, there are no pathological data patterns that will
cause the ISL36111 to move to an incorrect boost level.
Control Pin Boost Setting
TABLE 1. MAPPING BETWEEN BOOST LEVEL AND CP-PIN
CONNECTIVITY
CPA
CPB
BOOST LEVEL
Float
Float
0
Float
GND
1
GND
VDD
2
Float
VDD
3
VDD
Float
4
GND
Float
5
GND
GND
6
VDD
GND
7
VDD
VDD
8
CML Input and Output Buffers
The input and output buffers for the high-speed data channel in
the ISL36111 are implemented using CML. Equivalent input and
output circuits are shown in Figures 5 and 6.
V DD
IN[P]
Ω
50O
1st Filter
Stage
Ω
50O
IN[N]
The connectivity of the CP pins are used to determine the boost
level of ISL36111. Table 1 defines the mapping from the 2-bit CP
word to the 9 available boost levels.
FIGURE 5. CML INPUT EQUIVALENT CIRCUIT FOR THE ISL36111
5
FN6974.2
July 19, 2012
ISL36111
VDD
50Ω
VDD
50Ω
11k Ω
OUT [P]
OUT [N]
LOSB
Internal LOS
Indicator
FIGURE 6. CML OUTPUT EQUIVALENT CIRCUIT FOR THE
ISL36111
Line Silence/Quiescent Mode
Line silence is commonly broken by the limiting amplification in
other equalizers. This disruption can be detrimental in many
systems that rely on line silence as part of the protocol. The
ISL36111 contains special lane management capabilities to
detect and preserve periods of line silence while still providing
the fidelity-enhancing benefits of limiting amplification during
active data transmission. Line silence is detected by measuring
the amplitude of the input signal and comparing that to a
threshold set by the voltage at the DT pin. When the amplitude
falls below the threshold, the output driver stage is muted.
LOS Bar Indicator
FIGURE 7. LOSB EQUIVALENT OUTPUT STRUCTURE
Detection Thereshold (DT) Pin
Functionality
The ISL36111 is capable of maintaining periods of line silence by
monitoring the channel for loss of signal (LOS) conditions and
subsequently muting the output driver when such a condition is
detected. A reference voltage applied to the detection threshold
(DT) pin is used to set the LOS threshold of the internal signal
detection circuitry. The DT voltage is set with an external pull-up
resistor, RDT. For typical applications, a 30kΩ resistor is
recommended for channels with loss greater than 12dB at 5GHz,
and a 1.8kΩ resistor is recommended for lower loss channels.
Other values of the resistor may also be applicable; therefore DT
settings should be verified on an application-specific basis.
Pin 4 (LOSB) is used to output the state of the muting circuitry to
serve as a loss of signal indicator for the device. This signal is
directly derived from the muting signal output by the detection
threshold / signal detector comparator. The LOSB signal goes
LOW when the signal detector output is below the externally
controlled detection threshold and HIGH when the detector
output goes above this threshold. This feature is meant to be
used in optical systems (e.g. SFP+) where there are no quiescent
or electrical-idle states. In these cases, the detection threshold is
used to determine the sensitivity of the LOSB indicator. Figure 7
shows the schematic of the LOSB equivalent output structure.
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July 19, 2012
ISL36111
Application Information
Typical application schematic for ISL36111 is shown in Figure 8.
100nF
4
13
14
GND
NC
15
ISL36111
IN_N
OUT_N
VDD
LOSB
CPA
6
5
GND
LOSB (output)
OUT_P
12
100nF
11
OUTPUT SIGNAL
10
9
1.2V
100nF
GND
3
IN_P
8
INPUT SIGNAL
2
VDD
CPB
100nF
1.2V
VDD
7
1
DT
1.2V
GND
16
DT
47nF
100pF
CPA
CPB
NOTES:
14. See “Control Pin Boost Setting” on page 5 for information on how to connect the CP pins
15. See “Detection Thereshold (DT) Pin Functionality” on page 6 for details on DT pin operation.
16. Although the filtering network is shown only for one VDD pin for simplicity, all the VDD pins need to be connected in this way.
FIGURE 8. TYPICAL APPLICATION REFERENCE SCHEMATIC FOR ISL36111
PCB Layout Considerations
Because of the high speed of the ISL36111 signals, careful PCB
layout is critical to maximize performance. The following
guidelines should be adhered to as closely as possible:
• All high speed differential pair traces should have a
characteristic impedance of 50Ω with respect to ground plane
and 100Ω with respect to each other.
• Avoid using vias for high speed traces as this will create
discontinuity in the traces characteristic impedance.
• Input and output traces need to have DC blocking capacitors
(100nF). Capacitors should be placed as close to the chip as
possible.
• For each differential pair, the positive trace and the negative
trace need to be of same length in order to avoid intra-pair
skew. Serpentine technique may be used to match trace
lengths.
• Maintain a constant solid ground plane underneath the highspeed differential traces
and the bypass capacitors in order to maximize the power
supply noise rejection.
About Q:ACTIVE®
Intersil has long realized that to enable the complex server
clusters of next generation datacenters, it is critical to manage
the signal integrity issues of electrical interconnects. To address
this, Intersil has developed its groundbreaking Q:ACTIVE®
product line. By integrating its analog ICs inside cabling
interconnects, Intersil is able to achieve unsurpassed
improvements in reach, power consumption, latency, and cable
gauge size as well as increased airflow in tomorrow’s
datacenters. This new technology transforms passive cabling into
intelligent “roadways” that yield lower operating expenses and
capital expenditures for the expanding datacenter.
Intersil Lane Extenders allow greater reach over existing cabling
while reducing the need for thicker cables. This significantly
reduces cable weight and clutter, increases airflow, and improves
power consumption.
• Each VDD pin should be connected to 1.2V and also bypassed
to ground through a 47nF and a 100pF capacitor in parallel.
Minimize the trace length and avoid vias between the VDD pin
7
FN6974.2
July 19, 2012
ISL36111
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you
have the latest Rev.
DATE
REVISION
CHANGE
July 12, 2012
FN6974.2
On page 1, Column 1, changed last paragraph from:
"Operating on a single 1.2V power supply, the ISL36111 enables channel throughputs of 10Gb/s to 11.1Gb/s
while supporting lower data rates including 8.5, 6.25, 5, 4.25, 3.125 and 2.5Gb/s."
to:
"Operating on a single 1.2V power supply, the ISL36111 enables channel throughputs of 10Gb/s to 11.1Gb/s
while supporting lower data rates including 8.5, 6.25, 5, 4.25, 3.125, 2.5 and 1 Gb/s."
In “Electrical Specifications” on page 3 , changed Min Entry for “Bit Rate” from: "2.5Gb/s" to: "1Gb/s"
Added Note 14 to MIN and MAX columns of spec tables.
October 27, 2010
FN6974.1
1. Added “Application Information” on page 7, Figure 8 on page 7, and “PCB Layout Considerations” on page 7
2. Corrected “Pin Descriptions” on page 2 for VDD pin from "and 10nF decoupling capacitors.." to “and 47nF
decoupling capacitors.."
3. Corrected “Pin Descriptions” on page 2 for CP[A,B] pin from "Pins are read as a 3-digit number.." to "Pins are
read as a 2-digit number.."
November 19, 2009
FN6974.0
Initial Release to web
Products
Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products
address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks.
Intersil's product families address power management and analog signal processing functions. Go to www.intersil.com/products for a
complete list of Intersil product families.
For a complete listing of Applications, Related Documentation and Related Parts, please see the respective device information page on
intersil.com: ISL36111
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Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time
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For information regarding Intersil Corporation and its products, see www.intersil.com
8
FN6974.2
July 19, 2012
ISL36111
Package Outline Drawing
L16.3x3B
16 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE
Rev 1, 4/07
4X 1.5
3.00
12X 0.50
A
B
6
PIN 1
INDEX AREA
6
PIN #1 INDEX AREA
16
13
12
3.00
1
1 .70
+ 0.10
- 0.15
4
9
0.15
(4X)
5
8
0.10 M C A B
+ 0.07
4 16X 0.23 - 0.05
TOP VIEW
16X 0.40 ± 0.10
BOTTOM VIEW
SEE DETAIL "X"
0.10 C
C
0 . 90 ± 0.1
BASE PLANE
SEATING PLANE
0.08 C
( 2. 80 TYP )
SIDE VIEW
(
1. 70 )
( 12X 0 . 5 )
( 16X 0 . 23 )
C
0 . 2 REF
5
0 . 00 MIN.
0 . 05 MAX.
( 16X 0 . 60)
TYPICAL RECOMMENDED LAND PATTERN
DETAIL "X"
NOTES:
1. Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2. Dimensioning and tolerancing conform to AMSE Y14.5m-1994.
3. Unless otherwise specified, tolerance : Decimal ± 0.05
4. Dimension b applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
5. Tiebar shown (if present) is a non-functional feature.
6. The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
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July 19, 2012