Microchip SY58020U Bedienungsanleitung
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SY58020U
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SY58020U
6GHz, 1:4 CML Fanout Buffer/Translator
with Internal I/O Termination
P . recision Edge is rademark f Micrel, Inc a t o
Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 944 0800 • fax + 1 (408) 474 1000 • San - - http://www.micrel.com
October 27
, 2014 Revision 5.0
tcghelp@micrel.com -or (408) 955 1690
General Description
The SY58020U is a 2.5V/3.3V precision, high-speed, fully
differential 1:4 CML fanout buffer. Optimized to provide
four identical output copies with less than 15ps of skew
and 27fsRMS of typical additive phase jitter, the SY58020U
can process clock signals as fast as 6GHz.
The differential input includes Micrel’s unique, 3-pin input
termination architecture interfaces to differential that
LVPECL, LVDS, and CML signals (AC or DC coupled) as - -
small as 100mV without any level shifting or termination -
resistor networks in the signal path. For AC coupled input -
interface applications, an on output reference -board
voltage (VREF-AC) is provided to bias the VT pin. The outputs
are optimized to drive 400mV typical swing into 50Ω loads,
with extremely fast rise/fall times guaranteed to be less
than 60ps.
The SY58020U operates from a 2.5V ±5% supply or 3.3V
±10% supply and is guaranteed over the full industrial
temperature range ( 40°C to +85°C). For applications that –
require LVPECL outputs, consider the SY58021U or
SY58022U 1:4 fanout buffer with 800mV and 400mV
output swing, respectively. The SY58020U is part of
Micrel’s high-speed, Precision Edge® product line.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
•Precision 1:4, 400mV CML fanout buffer
•Guaranteed AC performance over temperature/voltage:
−> 6GHz fMAX clock
−< 60ps tr / tf times
−< 250ps tpd
−< 15ps max. skew
•Low-jitter performance:
−27fsRMS typical additive phase jitter
•Accepts an input signal as low as 100mV
•Unique patented input termination and VT pin accepts
DC- -coupled and AC coupled differential inputs:
LVPECL, LVDS, and CML
•50Ω source terminated CML outputs
•Power supply 2.5V ±5% and 3.3V ±10%
•Industrial temperature range: –40°C to +85°C
•Available in 16-pin (3mm x 3mm) QFN package
Applications
•All SONET and All GigE clock distribution
•Fibre Channel clock and data distribution
•Backplane distribution
•Data distribution: OC- -48, OC 48+FEC, XAUI
•High-end, low skew, multiprocessor synchronous clock
distribution
Functional Block Diagram Typical Performance
Micrel, Inc.
SY58020U
October 27
, 2014 2 Revision 5.0
tcghelp@micrel.com -or (408) 955 1690
Ordering Information( )1
Part Number
Package Type
Operating Range
Package Marking
Lead Finish
SY58020UM 16G -QFN Industrial 020U with
Pb- -Free bar line indicator
Pb-Free
NiPdAu
SY58020UMG TR(2) - QFN 16 Industrial 020U with
Pb- -Free bar line indicator
Pb-Free
NiPdAu
Note:
1. 25 Contact factory for die availability. Dice are guaranteed at TA = °C, DC electrical only.
2. Tape and Reel.
Pin Conguration
16- - Pin QFN (QFN 16)
Pin Description
Pin Number
Pin Name
Pin Function
1 , 4 IN, /IN
Differential Input: This input pair receives the signal to be buffered. Each pin of this pair internally
terminates with 50Ω to the V
T pin. Note that this input will default to an indeterminate state if left
open. See “Input Interface Applications” section.
2 VT
Input Termination Center Tap: Each input terminates to this pin. The V- T pin provides a center p -ta
for each input (IN, /IN) to the termination network for maximum interface flexibility. See “Input
Interface Applications” section.
3 VREF-AC
Reference Output Voltage: This output biases to V
CC-1.2V. It is used when AC-coupling to
differential inputs. Connect VREF-AC directly to the VT pin. Bypass with 0.01 F low ESR capacitor µ
to VCC. See “Input Interface Applications” section.
8, 13 VCC Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the pins as
possible.
5, 16 GND,
Exposed Pad
Ground. Exposed pad must be connected to a ground plane that is the same potential as the
ground pin.
14, 15
11, 12
9, 10
6, 7
/Q0, Q0,
/Q1, Q1,
/Q2, Q2,
/Q3, Q3
CML Differential Output Pairs: Differential buffered output copy of the input signal. The output
swing is typically 400mV into 50Ω load. Normally terminate CML output pairs with 100Ω across Q
and /Q outputs at the receiving end. Unused output pairs may be left floating with no impact on
jitter or skew. See “CML Output Termination” section.
Micrel, Inc.
SY58020U
October 27
, 2014 3 Revision 5.0
tcghelp@micrel.com -or (408) 955 1690
Absolute Maximum Ratings( )3
Power Supply Voltage (VCC) .......................... - + V 0.5V to 4.0
Input Voltage (VIN). ............................................ -0.5V to V
CC
CML Output Voltage (VOUT) ............... VCC-1.0V to VCC+0.5V
Current (VT)
Source or sink current on VT pin....................... ± 100mA
Input Current
Source or sink current on IN, /IN ........................ ± 50mA
Current (VREF)
Source or sink current on VREF-AC( )6, .................. ± 1.5mA
Lead Temperature Soldering, (20 sec.) ..................... 260°C
Storage Temperature Range (TS) .............. - ° °C 65 C to +150
Operating Ratings( )4
Supply Voltage (VCC) .............................. +2.375 3.60V to + V
Ambient Temperature (TA
) .......................... – 40°C to +85°C
Junction Thermal Resistance
(QFN θJA)
- Still Air ....................................................... 60°C/W
500lfpm...................................................... 54°C/W
(QFN ΨJB)
- -(Junction to Board Resistance)( )5 .............. 33°C/W
DC Electrical Characteristics( ) 7
TA = - ° °C. 40 C to +85
Symbol Parameter Condition Min. . . Typ Max Units
VCC Power Supply Voltage VCC 00 V = 2.5V 2.375 2.5 2.625
VCC 0 V = 3.3V 3.000 3.300 3.60
ICC Power Supply Current No Load, VCC = max.
(include internal 50Ω - pull up)
150 180 mA
VIH
Input HIGH Voltage 8 VNote CC - V1.600 CC V
VIL 0 VInput LOW Voltage IH- V 0.100
VIN
Input Voltage Swing See Figure 1. 0.100 1.700 V
VDIFF_IN Differential Input Voltage Swing See Figure 2. 0.200 3.400 V
RIN - -VIN to T Resistance 40 50 60 Ω
VREF AC- Output Reference Voltage V
CC - V1.300 CC- V1.200 CC- V 1.100
VT IN - -VIN to T Voltage 0 V 1.28
CML DC Electrical Characteristics( ) 7
VCC ± ±= 3.3V 10% or 2.5V 5%; RL = 100Ω across each output pair or equivalent; TA
= - °40 C to +85°C, unless otherwise stated.
Symbol Parameter Condition Min. . . Typ Max Units
VOH Output HIGH Voltage VCC
- V0.020 CC- V0.010 CC V
VOUT Output Voltage Swing See Figure 1. 325 400 500 mV
VDIFF_OUT Differential Output Voltage
Swing
See Figure 2. 650 800 100 0 mV
ROUT Output Source Impedance 40 50 60 Ω
Notes:
3. 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.
4. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
5. Thermal performance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential on the PCB.
6. Due to the limited drive capability, use for input of the same package only.
7. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
8. VIH (min) not lower than 1.2V.
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | SY58020U |
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