MICREL SY56216RMG

SY56216R
Low Voltage 1.2V/1.8V/2.5V CML Dual
Channel Buffer 4.5GHz/6.4Gbps with
Equalization
General Description
The SY56216R is a fully-differential, low-voltage
1.2V/1.8V/2.5V CML Dual Channel Buffer with input
equalization. The SY56216R 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 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 (400mVpp) 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 VT pin. The outputs are CML, with
extremely fast rise/fall times guaranteed to be less than
80ps.
The SY56216R 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 SY56216R is part of Micrel’s highspeed, Precision Edge® product line.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Functional Block Diagram
Precision Edge®
Features
• 1.2V/1.8V/2.5V CML Dual Channel Buffer
• 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)
– <20ps within-device skew
– <80ps rise/fall times
• High-speed CML outputs
• 2.5V ±5% VCC , 1.2/1.8V/2.5V ±5% VCCO power
supply operation
• Industrial temperature range: –40°C to +85°C
• Available in 16-pin (3mm x 3mm) QFN package
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 trademarks 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
November 2010
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SY56216R
Ordering Information(1)
Part Number
Package Type
Operating Range
Package Marking
Lead Finish
SY56216RMG
QFN-16
Industrial
R216 with Pb-Free bar-line indicator
NiPdAu / Pb-Free
SY56216RMGTR(2)
QFN-16
Industrial
R216 with Pb-Free bar-line indicator
NiPdAu / Pb-Free
Notes:
1.
Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC Electricals only.
2.
Tape and Reel.
Pin Configuration
16-Pin QFN
Truth Table
EQ Setting
EQUALIZATION FR4 6 mil Stripline
LOW
9“
FLOAT
18”
HIGH
27”
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SY56216R
Pin Description
Pin Number
Pin Name
Pin Function
16,1
IN0, /IN0
4,5
IN1, /IN1
Differential Inputs: Signals as small as 200mVpk (400mVPP) applied to the input of 9, 18 or
27 inches 6 mil FR4 stripline transmission line are then terminated the differential input .
Each input pin internally terminates with 50Ω to the VT pin.
2,3
VT0, VT1
15,6
EQ0, EQ1
7
VCC
Positive Power Supply: Bypass with 0.1µF//0.01µF low-ESR capacitors as close to the VCC
pins as possible. Supplies input and core circuitry.
8,13
VCCO
Output Supply: Bypass with 0.1µF//0.01µF low-ESR capacitors as close to the VCCO pins as
possible. Supplies the output buffers.
14
GND,
Exposed pad
12,11
Q0, /Q0
10,9
Q1, /Q1
November 2010
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 0.01µF low-ESR capacitor to VCC. See “Interface Applications”
subsection and Figure 2a.
Three level inputs for equalization control. Low, Float, High
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.
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SY56216R
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VCC) ............................... –0.5V to +3.0V
Supply Voltage (VCCO) ............................. –0.5V to +3.0V
VCC − VCCO ..............................................................<1.8V
VCCO − VCC ..............................................................<0.5V
Input Voltage (VIN) .......................................–0.5V to VCC
CML Output Voltage (VOUT) ......................... 0.6V to 3.0V
Current (VT)
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 (Ts) ....................–65°C to +150°C
Supply Voltage (VCC)................... 2.375V to 2.625V
(VCCO) ................... 1.14V to 2.625V
Ambient Temperature (TA) ............. –40°C to +85°C
Package Thermal Resistance(3)
QFN
Still-air (θJA) ..................................75°C/W
Junction-to-board (ψJB)................33°C/W
DC Electrical Characteristics(5)
TA = –40°C to +85°C, unless otherwise stated.
Symbol
VCC
Parameter
Power Supply Voltage Range
Condition
Min.
Typ.
Max.
VCC
2.375
2.5
2.625
VCCO
1.14
1.2
1.26
VCCO
1.7
1.8
1.9
VCCO
2.375
2.5
2.625
Units
V
ICC
Power Supply Current
Maximum VCC.
72
105
mA
ICCO
Power Supply Current
No Load. Maximum VCCO.
32
42
mA
RIN
Input Resistance
(IN-to-VT, /IN-to-VT )
45
50
55
Ω
RDIFF_IN
Differential Input Resistance
(IN-to-/IN)
90
100
110
Ω
VIH
Input HIGH Voltage (IN, /IN)
1.42
VCC
V
VIL
Input LOW Voltage (IN, /IN)
1.22V=1.7-0.475
1.22
VIH – 0.2
V
VIN
Input Voltage Swing (IN, /IN)
See Figure 3a, applied to input of
transmission line.
0.2
1.0
V
VDIFF_IN
Differential Input Voltage Swing
(|IN - /IN|)
See Figure 3b, applied to input of
transmission line.
0.4
2.0
V
VT_IN
Voltage from Input to VT
1.28
V
IN, /IN
IN, /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. ψJB and θJA
values are determined for a 4-layer board in still-air number, unless otherwise stated.
4. Due to the limited drive capability, use for input of the same package only.
5. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
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SY56216R
CML Outputs DC Electrical Characteristics(6)
VCCO = 1.14V to 1.26V, RL = 50Ω to VCCO,
VCCO = 1.7V to 1.9V, 2.375V to 2.625V, RL = 50Ω to VCCO or 100Ω across the outputs,
VCC = 2.375V to 2.625V, TA = –40°C to +85°C, unless otherwise stated.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
VOH
Output HIGH Voltage
RL = 50Ω to VCCO
VCC − 0.020
VCC − 0.010
VCC
V
VOUT
Output Voltage Swing
VDIFF_OUT
Differential Output Voltage Swing
See Figure 3a
300
390
475
mV
See Figure 3b
600
780
950
mV
ROUT
Output Source Impedance
45
50
55
Ω
Typ.
Max.
Units
Three Level EQ Input DC Electrical Characteristics(6)
VCC = 2.375V to 2.625V, TA = –40°C to +85°C, unless otherwise stated.
Symbol
Parameter
Condition
Min.
VIH
Input HIGH Voltage
VCC − 0.3
VIL
Input LOW Voltage
0
IIH
Input HIGH Current
VIH = VCC
IIL
Input LOW Current
VIL =GND
V
VEE+
V
0.3
400
uA
−450
uA
Note:
6. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
AC Electrical Characteristics
VCCO = 1.14V to 1.26V, RL = 50Ω to VCCO,
VCCO = 1.7V to 1.9V, 2.375V to 2.625V, RL = 50Ω to VCCO or 100Ω across the outputs,
VCC = 2.375V to 2.625V, TA = –40°C to +85°C, unless otherwise stated.
Symbol
Parameter
fMAX
Maximum Frequency
tPD
Propagation Delay
IN-to-Q, Figure 1
Within Device Skew
Note 7
Part-to-Part Skew
tSkew
tJitter
tR tF
Condition
Min.
NRZ Data
6.4
Gbps
4.5
GHz
VOUT > 200mV
Clock
100
Typ.
Max.
Units
180
280
ps
4
20
ps
Note 8
100
ps
Random Jitter
Note 9
1
psRMS
Crosstalk Induced Jitter (Adjacent Channel)
Note 10
0.7
psPP
Output Rise/Fall Times
(20% to 80%)
At full output swing.
80
ps
20
50
Notes:
7.
Within device skew is the difference in tPD between the two channels under identical input transition, temperature and power supply.
8.
Part-to-part skew is defined for two parts with identical power supply voltages at the same temperature and no skew at the edges at the
respective inputs.
9.
Random jitter is measured with a K28.7 pattern, measured at ≤ fMAX.
10. Crosstalk induced jitter is defined as the added jitter that results from signals applied to the adjacent channel. It is measured at the output while
applying a similar, differential clock frequency that is asynchronous with respect to each other at the adjacent input.
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SY56216R
Interface Applications
For Input Interface Applications see Figures 4a
through 4e. For CML Output Termination see Figures
5a through 5d
CML Output Termination with VCCO 1.2V
For VCCO of 1.2V, Figure 5a, terminate the output
with 50Ω-to-1.2V, DC coupled, not 100Ω differentially
across the outputs.
If AC-coupling is used, Figure 5d, terminate into 50Ωto-1.2V before the coupling capacitor and then
connect to a high value resistor to a reference voltage.
Do not AC couple with internally terminated receiver.
For example, 50Ω ANY-IN input. AC-coupling will
offset the output voltage by 200mV and this offset
voltage will be too low for proper driver operation. Any
unused output pair needs to be terminated when
VCCO is 1.2V, do not leave floating.
CML Output Termination with 1.8V/2.5V VCCO
For VCCO of 1.8V or 2.5V, Figure 5a and Figure 5b,
terminate with either 50Ω-to-VCCO or 100Ω
differentially across the outputs. AC- or DC-coupling is
fine. See Figure 5c for AC-coupling.
Input AC-Coupling
The SY56216R input can accept AC-coupling from
any driver. Bypass VT with a 0.1µF low ESR capacitor
to VCC as shown in Figures 4b and 4c. VT has an
internal high impedance resistor divider as shown in
Figure 2a, to provide a bias voltage for AC-coupling.
Input Termination
From 1.8V CML driver. Terminate with VT tied to 1.8V.
Do not terminate 100 ohms differentially.
From 2.5V CML driver. Terminate with either VT tied
to 2.5V or 100 ohms differentially.
The input cannot be DC-coupled from a 1.2V CML
driver.
Timing Diagrams
Figure 1. Propagation Delay
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SY56216R
Typical Characteristics
VCC = 2.5, VCCO =1.2V, GND = 0V, VIN = 160mV, RL = 50Ω to 1.2V, TA = 25°C, unless otherwise stated.
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SY56216R
Input and Output Stage
Figure 2a. Simplified Differential Input Buffer
Figure 2b. Simplified CML Output Buffer
Single-Ended and Differential Swings
Figure 3b. Differential Swing
Figure 3a. Single-Ended Swing
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SY56216R
Input Interface Applications
Figure 4a. CML Interface
(DC-Coupled, 1.8V, 2.5V)
Figure 4b. CML Interface
(AC-Coupled)
Option: May connect VT to VCC
Figure 4d. LVPECL Interface
(DC-Coupled)
November 2010
Figure 4c. LVPECL Interface
(AC-Coupled)
Figure 4e. LVDS Interface
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SY56216R
CML Output Termination
Figure 5a. 1.2V 1.8V or 2.5V
CML DC-Coupled Termination
Figure 5b. 1.8V or 2.5V
CML DC-Coupled Termination
Figure 5c. CML AC-Coupled Termination
(VCCO 1.8V or 2.5V only)
Figure 5d. CML AC-Coupled Termination
(VCCO 1.2V only)
Related Product and Support Documents
Part Number
Function
Datasheet Link
HBW Solutions
New Products and Termination
Application Notes
http://www.micrel.com/page.do?page=/product-info/as/HBWsolutions.shtml
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SY56216R
Package Information
16-Pin QFN
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical
implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user.
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© 2008 Micrel, Incorporated.
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