SY56023R
Low Voltage 1.2V/1.8V/2.5V CML 2x2
Crosspoint Switch 6.4Gbps with
Equalization
General Description
The SY56023R is a fully-differential, low-voltage
1.2V/1.8V/2.5V CML 2x2 crosspoint switch with input
equalization. The SY56023R can process clock signals
as fast as 5GHz 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 SY56023R 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 SY56023R 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 2x2 crosspoint switch
•
Equalizes 9, 18, 27 inches of FR4
•
Guaranteed AC performance over temperature and
voltage:
– DC-to > 6.4Gbps Data throughput
– DC-to > 5GHz Clock throughput
– <280 ps propagation delay (IN-to-Q)
– <15 ps output skew
– <80 ps rise/fall times
•
Ultra-low jitter design
– <1 ps
RMS
cycle-to-cycle 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
Functional Block Diagram
Applications
•
•
•
•
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.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
March 1, 2013
Revision 2.1
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY56023R
Ordering Information
(1)
Part Number
SY56023RMG
SY56023RMGTR
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
R023 with Pb-Free
Bar-Line Indicator
R023 with Pb-Free
Bar-Line Indicator
Lead Finish
NiPdAu
Pb-Free
NiPdAu
Pb-Free
Pin Configuration
16-Pin QFN
Truth Table
SEL0
L
L
H
H
SEL1
L
H
L
H
Q0
IN0
IN0
IN1
IN1
Q1
IN0
IN1
IN0
IN1
EQ
LOW
FLOAT
HIGH
EQUALIZATION
27 “
18”
9”
March 1, 2013
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Revision 2.1
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY56023R
Pin Description
Pin Number
16,1
4,5
Pin Name
IN0, /IN0
IN1, /IN1
Pin Function
Differential Inputs: Signals as small as 200mV V
PK
(400mV
PP
) applied to the input of 9, 18 or
27 inches 6 mil FR4 stripline transmission line are then terminated with the differential input.
Each input pin internally terminates with 50Ω to the VT pin.
Input Termination Center-Tap: Each side of the differential input pair terminates to a 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 “Interface Applications”
subsection and Figure 2a.
Three level input for equalization control. High, float, low. EQ pin applies the same EQ
setting to both inputs.
These single-ended TTL/CMOS-compatible inputs, selects inputs IN0 or IN1. Note that
these inputs are internally connected to a 25kΩ pull-up resistor and will default to a logic
HIGH state if left open.
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.
2
3
VT0
VT1
13
15
6
7
8
14
12,11
10,9
EQ
SEL0
SEL1
VCC
VCCO
GND,
Exposed Pad
Q0, /Q0
Q1, /Q1
March 1, 2013
3
Revision 2.1
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY56023R
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
I
CC
I
CCO
R
IN
R
DIFF_IN
V
IH
V
IL
V
IN
V
DIFF_IN
V
T_IN
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 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
IN
(max) is specified when V
T
is floating.
Min
2.375
1.14
1.7
2.375
Typ
2.5
1.2
1.8
2.5
80
32
Max
2.625
1.26
1.9
2.625
110
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
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
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
50
100
March 1, 2013
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Revision 2.1
hbwhelp@micrel.com
or (408) 955-1690
Micrel, Inc.
SY56023R
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 Input 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
March 1, 2013
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Revision 2.1
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or (408) 955-1690
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