SY56011R
Low Voltage 1.2V/1.8V/2.5V CML 1:2
Fanout Buffer 6.4Gbps with Equalization
Preliminary
General Description
The SY56011R is a fully differential, low voltage
1.2V/1.8V/2.5V CML 1:2 Fanout Buffer with input
equalization. The SY56011R can process clock signals
as fast as 4.5 GHz or data patterns up to 6.4Gbps.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that interfaces to CML
differential signals, without any level-shifting or
termination resistor networks in the signal path. The
differential input can also accept AC-coupled LVPECL
and LVDS signals. Input voltages as small as 200mV
(400mV
pp
) are applied before the 9”, 18” or 27” FR4
transmission line. For AC-coupled input interface
applications, an internal voltage reference is provided to
bias the V
T
pin. The outputs are CML, with extremely
fast rise/fall times guaranteed to be less than 80ps.
The SY56011R operates from a 2.5V ±5% core supply
and a 1.2V, 1.8V or 2.5V ±5% output supply and is
guaranteed over the full industrial temperature range
(–40°C to +85°C). The SY56011R is part of Micrel’s
®
high-speed, Precision Edge product line.
Datasheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Precision Edge
®
Features
•
1.2V/1.8V/2.5V CML 1:2 Fanout Buffer
•
Equalizes 9, 18, 27 inches of FR4
•
Guaranteed AC performance over temperature and
voltage:
– DC-to > 6.4Gbps Data throughput
– DC-to > 4.5GHz Clock throughput
– <280ps propagation delay (IN-to-Q)
– <15ps within-device skew
– <80ps rise/fall times
•
Ultra-low jitter design
– <1ps
RMS
random jitter
•
High-speed CML outputs
•
2.5V ±5% V
CC
, 1.2/1.8V/2.5V ±5% V
CCO
power supply
operation
•
Industrial temperature range: –40°C to +85°C
•
Available in 16-pin (3mm x 3mm) QFN package
Applications
Functional Block Diagram
•
•
•
•
Data Distribution:
SONET clock and data distribution
Fiber Channel clock and data distribution
Gigabit Ethernet clock and data distribution
Markets
•
•
•
•
•
•
Storage
ATE
Test and measurement
Enterprise networking equipment
High-end servers
Metro area network equipment
Precision Edge is a registered trademark of Micrel, Inc.
QFN and
MicroLeadFrame
are registered trademarks of Amkor Technology.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
July 2008
M9999-070208-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY56011R
Ordering Information
(1)
Part Number
SY56011RMG
SY56011RMGTR
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A
= 25°C, DC Electricals only.
2. Tape and Reel.
(2)
Package
Type
QFN-16
QFN-16
Operating
Range
Industrial
Industrial
Package Marking
R011 with Pb-Free
bar-line indicator
R011 with Pb-Free
bar-line indicator
Lead
Finish
NiPdAu
Pb-Free
NiPdAu
Pb-Free
Pin Configuration
16-Pin QFN
Truth Table
EQ
LOW
FLOAT
HIGH
Equalization FR4 6mil Stripline
9”
18”
27”
July 2008
2
M9999-070208-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY56011R
Pin Description
Pin Number
1,2
Pin Name
IN, /IN
Pin Function
Differential Input: Signals as small as 200mV V
PK
(400mV
PP
) applied to the input of 9, 18 or
27 inches 6mil FR4 stripline transmission line are then terminated with this differential input.
Each input pin internally terminates with 50
Ω to the VT pin.
Input Termination Center-Tap: Each side of the differential input pair terminates to VT pin.
This pin provides a center-tap to a termination network for maximum interface flexibility. An
internal high impedance resistor divider biases VT to allow input AC-coupling. For AC-
coupling, bypass VT with 0.1µF low ESR capacitor to V
CC
. See “Interface Applications”
subsection and Figure 2a.
Three level input for equalization control. High, float, low.
Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the V
CC
pins as possible. Supplies input and core circuitry.
Output Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the V
CCO
pins as
possible. Supplies the output buffers.
Ground: Exposed pad must be connected to a ground plane that is the same potential as the
ground pins.
CML Differential Output Pairs: Differential buffered copy of the input signal. The output swing
is typically 390mV. See “Interface Applications” subsection for termination information.
No connect pins
3
VT
6
7
8,13
14
12,11
10,9
4,5,15,16
EQ
VCC
VCCO
GND,
Exposed pad
Q0, /Q0
Q1, /Q1
NC
July 2008
3
M9999-070208-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY56011R
Absolute Maximum Ratings
(1)
Supply Voltage (V
CC
) ............................... –0.5V to +3.0V
Supply Voltage (V
CCO
) ............................. –0.5V to +3.0V
V
CC
- V
CCO
............................................................... <1.8V
V
CCO
- V
CC
............................................................... <0.5V
Input Voltage (V
IN
) ....................................... –0.5V to V
CC
CML Output Voltage (V
OUT
) ......................... 0.6V to 3.0V
Current (V
T
)
Source or sink on VT pin ............................. ±100mA
Input Current
Source or sink Current on (IN, /IN) ................ ±50mA
Maximum operating Junction Temperature .......... 125°C
Lead Temperature (soldering, 20sec.) .................. 260°C
Storage Temperature (T
s
) .................... –65°C to +150°C
Operating Ratings
(2)
Supply Voltage (V
CC
) .......................... 2.375V to 2.625V
(V
CCO
) .......................... 1.14V to 2.625V
Ambient Temperature (T
A
) ................... –40°C to +85°C
(3)
Package Thermal Resistance
QFN
Still-air (θ
JA
) .................................................. 75°C/W
Junction-to-board (ψ
JB
) ................................ 33°C/W
DC Electrical Characteristics
(4)
T
A
= –40°C to +85°C, unless otherwise stated.
Symbol
V
CC
Parameter
Power Supply Voltage Range
Condition
V
CC
V
CCO
V
CCO
V
CCO
Max. V
CC
No Load. V
CCO
45
90
IN, /IN
IN, /IN
1.22V = 1.7-0.475
See Figure 3a, Note 5, applied to
input of transmission line.
See Figure 3b, Note 5, applied to
input of transmission line.
1.42
1.22
0.2
0.4
Min
2.375
1.14
1.7
2.375
Typ
2.5
1.2
1.8
2.5
54
32
50
100
Max
2.625
1.26
1.9
2.625
75
42
55
110
V
CC
V
IH
–0.2
1.0
2.0
1.28
Units
V
V
V
V
mA
mA
Ω
Ω
V
V
V
V
V
I
CC
I
CCO
R
IN
R
DIFF_IN
V
IH
V
IL
V
IN
V
DIFF_IN
V
T_IN
Notes:
Power Supply Current
Power Supply Current
Input Resistance
(IN-to-V
T
, /IN-to-V
T
)
Differential Input Resistance
(IN-to-/IN)
Input HIGH Voltage
(IN, /IN)
Input LOW Voltage
(IN, /IN)
Input Voltage Swing
(IN, /IN)
Differential Input Voltage Swing
(|IN - /IN|)
Voltage from Input to V
T
1. Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not
implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratings conditions for
extended periods may affect device reliability.
2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
3. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the device's most negative potential on the PCB.
ψ
JB
and
θ
JA
values are determined for a 4-layer board in still-air number, unless otherwise stated.
4. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
5. V
IH
(max) is specified when V
T
is floating.
July 2008
4
M9999-070208-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY56011R
CML Outputs DC Electrical Characteristics
(6)
V
CCO
= 1.14V to 1.26V R
L
= 50Ω
to V
CCO,
V
CCO
= 1.7V to 1.9V, 2.375V to 2.625V, R
L
= 50Ω
to V
CCO
or 100Ω
across the outputs.
V
CC
= 2.375V to 2.625V; T
A
= –40°C to +85°C, unless otherwise stated.
Symbol
V
OH
V
OUT
V
DIFF_OUT
R
OUT
Parameter
Output HIGH Voltage
Output Voltage Swing
Differential Output Voltage Swing
Output Source Impedance
Condition
R
L
= 50Ω
to V
CCO
See Figure 3a
See Figure 3b
Min
V
CC
-0.020
300
600
45
Typ
V
CC
-0.010
390
780
50
Max
V
CC
475
950
55
Units
V
mV
mV
Ω
Three Level EQ Input DC Electrical Characteristics
(6)
V
CC
= 2.375V to 2.625V; T
A
= –40°C to +85°C, unless otherwise stated.
Symbol
V
IH
V
IL
I
IH
I
IL
Note:
6. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
Parameter
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
Condition
Min
V
CC
-0.3
0
Typ
Max
V
EE
+0.3
400
Units
V
V
uA
uA
V
IH
= V
CC
V
IL
= GND
-480
July 2008
5
M9999-070208-A
hbwhelp@micrel.com
or (408) 955-1690
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