SY56028XR
Low Voltage 1.2V/1.8V/2.5V CML
4:1 MUX with 1:2 FANOUT
6.4Gbps with EQUALIZATION
.
General Description
The SY56028XR is a fully differential, low voltage
1.2V/1.8V/2.5V CML 4:1 MUX, with input equalization,
and integrated 1:2 Fanout Buffer. The SY56028XR can
process clock signals as fast as 4.5GHz or data patterns
up to 6.4Gbps.
The differential input includes Micrel’s unique 3-pin input
termination architecture that interfaces to DC-coupled
2.5V/3.3V LVPECL, 1.2V/1.8V/2.5V CML or LVDS
differential signals. For AC-coupled input applications,
an internal voltage reference is provided for input bias.
Input voltages as small as 200mV (400mV
pp
) are applied
before the 9, 18 or 27-inch FR4 transmission line.
The SY56028XR 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 SY56028XR is part of Micrel’s
®
high-speed, Precision Edge product line.
Data sheets 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 4:2 MUX with input equalization.
•
Guaranteed AC performance over temperature and
voltage:
– DC-to > 6.4Gbps throughput
– <360ps propagation delay (IN-to-Q)
– <15ps within-device skew
•
Ultra-low jitter design
– <0.8ps
RMS
random jitter
– <10ps
PP
deterministic jitter
•
2.5V ±5% , 1.8/1.2V ±5% power supply operation
•
Industrial temperature range: –40°C to +85°C
•
Available in 32-pin (5mm x 5mm) QFN package
Functional Block Diagram
Applications
•
•
•
•
Data Distribution
SONET clock and data distribution
Fiber Channel clock and data distribution
Gigabit Ethernet clock and data distribution
Precision Edge is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
April 2010
M9999-040810-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY56028XR
Ordering Information
(1)
Part Number
SY56028XRMG
SY56028XRMGTR
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-32
QFN-32
Operating
Range
Industrial
Industrial
Package Marking
SY56028X with Pb-Free
bar-line indicator
SY56028X with Pb-Free
bar-line indicator
Lead
Finish
NiPdAu
Pb-Free
NiPdAu
Pb-Free
Pin Configuration
32-Pin QFN
April 2010
2
M9999-040810-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY56028XR
Pin Description
Pin Number
1,3
5,7
25,27
29,31
2
6
26
30
19
15
18
Pin Name
IN0, /IN0
IN1, /IN1
IN2, /IN2
IN3, /IN3
VT0
VT1
VT2
VT3
EQ
SEL0
SEL1
Input Termination Center-Tap: Each side of the differential input pair terminates to
the 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
VCC. See “Input Interface Applications” subsection and Figure 2a.
Three level input for equalization control.
Single-ended TTL/CMOS compatible input selects the inputs to the multiplexer. This
input is internally connected to a 25kΩ pull-up resistor and will default to a logic
HIGH state if left open. Input logic threshold is VCC/2. See “Truth Table” for select
control.
Positive Power Supply: Bypass with 0.1uF//0.01uF low ESR capacitors as close to
the V
CC
pin as possible. Supplies the input and core circuitry.
Output Supply: Bypass with 0.1uF//0.01uF low ESR capacitors as close to the V
CCO
pin 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 Pair: Differential buffered copy of the input signal. The
output swing is typically 390mV. See “Functional Description” subsection for
termination information.
Pin Function
Differential Inputs: Accepts differential signals as small as 200mV (400mV
PP
)
applied to the input of a 9, 18 or 27 inch 6mil FR4 stripline transmission line. See
“Input and Output Stage” section for details of this input.
16,17
10,13,20,23
4,8,9,24,28,32
12,11
22,21
VCC
VCCO
GND,
Exposed pad
Q0, /Q0
Q1, /Q1
Truth Table
EQ Input
LOW
FLOAT
HIGH
Equalization FR4 6mil
Stripline
9“
18”
27”
SEL1
0
0
1
1
SEL0
0
1
0
1
IN0 Input Selected
IN1 Input Selected
IN2 Input Selected
IN3 Input Selected
April 2010
3
M9999-040810-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY56028XR
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
............................................................... <0.5 V
Input Voltage (V
IN
) ............................. –0.5V to V
CC
+0.4V
CML Output Voltage (V
OUT
) ............................ 0.6V to 3V
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
) ............................................ 50°C/W
Junction-to-board (ψ
JB
) ......................... 20°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
I
CC
I
CCO
R
DIFF_IN
V
IH
V
IL
V
IN
V
DIFF_IN
V
T_IN
Power Supply Current
Power Supply Current
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
IN, /IN
IN, /IN
See Figure 3a, Note 5, applied to
input of transmission line.
See Figure 3b, Note 5, applied to
input of transmission line.
Max. V
CC
No Load. V
CCO
90
1.2
0
0.2
0.4
Min
2.375
1.14
1.7
2.375
Typ
2.5
1.2
1.8
2.5
110
32
100
Max
2.625
1.26
1.9
2.625
140
42
110
V
CC
+0.4
V
IH
–0.2
1.0
2.0
1.28
Units
V
V
V
V
mA
mA
Ω
V
V
V
V
V
Notes:
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 four-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
IN
(max) is specified when V
T
is floating.
April 2010
4
M9999-040810-A
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY56028XR
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
LVTTL/CMOS 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
Parameter
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
-125
-300
Condition
Min
2.0
Typ
Max
V
CC
0.8
30
Units
V
V
µA
µA
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
CC
V
EE
+0.3
400
Units
V
V
µA
µA
V
IH
= V
CC
V
IL
= GND
-480
April 2010
5
M9999-040810-A
hbwhelp@micrel.com
or (408) 955-1690
FPGA/CPLD
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