Microchip SY58033U Handleiding
Microchip
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SY58033U
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M9999-072810
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
■Precision 1:8, 400mV LVPECL fanout buffer
■Low-jitter performance:
• 76fsRMS phase jitter (typ)
■Guaranteed AC performance over temperature and
voltage:
• Clockfrequencyrange: DCto5.5GHz
• <80pstr / tf times
• <280pstpd
• <20psskew
■100kLVPECLcompatibleoutputs
■Fully differential inputs/outputs
■Accepts an input signal as low as 100mV
■UniqueinputterminationandVT pin accepts
DC-coupled and AC-coupled differential inputs:
(LVPECL, LVDS, and CML)
■Powersupply2.5V±5%or3.3V±10%
■Industrial temperature range: –40°C to +85°C
■Availablein32-pin(5mmx5mm)QFNPackage
FEATURES
ULTRA-PRECISION 1:8 FANOUT
BUFFER 400mV LVPECL OUTPUTS WITH
AND INTERNAL TERMINATION
Precision Edge®
SY58033U
APPLICATIONS
■AllSONETandallGigEclockdistribution
■AllFibreChannelclockanddatadistribution
■Networkroutingenginetimingdistribution
■High-end,low-skewmultiprocessorsynchronous
clockdistribution
Rev.: F Amendment: /0
Issue Date: October 2011
The SY58033U is a 2.5V/3.3V precision, high-speed, fully
differential 400mV LVPECL 1:8 fanout buffer. The SY58033U
is optimized to provide eight identical output copies with
less than 20ps of skew and only 76fsRMS phase jitter. It can
process clock signals as fast as 5.5GHz.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that allows the SY58033U to directly
interface to LVPECL, CML, and LVDS differential signal
(AC- or DC-coupled) without any level-shifting or termination
resistor networks in the signal path. The result is a clean,
stub-free, low-jitter solution. The LVPECL (100k temperature
compensated) outputs feature a 400mV typical swing into
50 ohms loads, and provide an extremely fast rise/fall time
guaranteed to be less than 80ps.
The SY58033U 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). Other high-speed 1:8
fanout buffers include the CML SY58031U and the 800mV
LVPECL SY58032U. The SY58033U is part of Micrel’s high-
speed, Precision Edge® product line.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
FUNCTIONAL BLOCK DIAGRAM
Precision Edge®
Precision Edge is a registered trademark of Micrel, Inc.
2
Precision Edge®
SY58033U
Micrel, Inc.
M9999-072810
hbwhelp@micrel.com or (408) 955-1690
PACkAGE/ORDERING INFORMATION
Pin Number Pin Name Pin Function
3,6 IN,/IN DifferentialSignalInput: Eachpinofthispairinternallyterminateswith50Ωtothe
VT pin. Note that this input will default to an indeterminate state if left open.
See “Input Interface Applications” section.
4 VT Input Termination Center-Tap: Each input terminates to this pin. The V
T pin provides a
center-tap for each input (IN, /IN) to the termination network for maximum interface
exibility.See“InputInterfaceApplications”section.
2, 7, 17, 24 GND, Ground. Exposed pad must be connected to a ground plane that is the same potential
Exposed Pad as the ground pin.
1, 8, 9, 16, VCC Positive Power Supply: Bypass with 0.1µF||0.01µF low ESR capacitors as close to the
18, 23, 25, 32 pins as possible.
31, 30, 29, 28, 27, Q0, /Q0, Q1, /Q1, 400mV LVPECL Differential Output Pairs: Differential buffered output copy of the
26,22,21,20,19, Q2,/Q2,Q3,/Q3 inputsignal.TheLVPECLoutputswingistypically400mVinto50Ω.Unused
15,14,13,12, Q4,/Q4,Q5,/Q5, outputpairsmaybeleftoatingwithnoimpactonjitter.See“LVPECLOutput”section.
11, 10 Q6, /Q6, Q7, /Q7
5 VREF-AC Bias Reference Voltage: Equal to V
CC–1.2V (approx.), and used for AC-coupled
applications. See “Input Interface Applications” section. When using V
REF-AC, bypass
with 0.01µF capacitor to VCC. Maximum sink/source current is 0.5mA.
PIN DESCRIPTION
32-PinQFN(QFN-32)
Ordering Information(1)
Package Operating Package
PartNumber Type Range Marking
SY58033UMG(3) QFN-32 Industrial SY58033U with
Pb-Free Pb-Free bar-line indicator
SY58033UMGTR(2, 3) QFN-32 Industrial SY58033U with
Pb-Free Pb-Free bar-line indicator
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A = 25°C, DC electricals only.
All devices are Pb-Free.
2. Tape and Reel.
3. Pb-Free package recommended for new designs.
3
Precision Edge®
SY58033U
Micrel, Inc.
M9999-072810
hbwhelp@micrel.com or (408) 955-1690
AbsoluteMaximumRatings(1)
Power Supply Voltage (VCC ) .......................–0.5V to +4.0V
Input Voltage (VIN) ...........................................–0.5V to V
CC
Current (VT)
Source or sink current on VT pin......................... ±100mA
Input Current (VT)
Source or sink current on IN, /IN .......................... ±50mA
Current (VREF)
Source or sink current on VREF-AC(3) ................... ±1.5mA
Lead Temperature Soldering (20 sec.) ...................... 260°C
Storage Temperature Range (TS ) ............ –65°C to +150°C
Operating Ratings(2)
Power Supply Voltage (VCC) ................. +2.375V to +3.60V
Ambient Temperature Range (TA) .............. –40°C to +85°C
Package Thermal Resistance(4)
QFN(θJA)
Still-Air ............................................................. 35°C/W
QFN(ψJB)
Junction-to-Board ............................................ 20°C/W
Symbol Parameter Condition Min Typ Max Units
VCC Power Supply Voltage 2.5V nominal 2.375 2.5 2.625 V
3.3V nominal 3.0 3.3 3.6 V
ICC Power Supply Current VCC = max. No. load includes current 180 250 mA
through50Ωpull-ups.
VIH Input HIGH Voltage IN, /IN, Note 6 V CC–1.6 VCC V
VIL
Input LOW Voltage IN, /IN 0 V IH–0.1 V
VIN Input Voltage Swing IN, /IN, see Figure 1a. 0.1 1.7 V
VDIFF_IN Differential Input Voltage Swing IN, /IN, see Figure 1b. 0.2 V
|IN0, /IN0|, |IN1, /IN1|
RIN In-to-VTResistance 40 50 60 Ω
VT IN Max. In-to-VT (IN, /IN) 1.28 V
VREF-AC VCC–1.3 VCC–1.2 VCC–1.1 V
DCELECTRICALCHARACTERISTICS(5)
TA= –40°C to +85°C.
VCC = 2.5V ±5% or 3.3V ±10%; RL = 50ý to VCC–2V; TA= –40°C to +85°C unless otherwise stated
Symbol Parameter Condition Min Typ Max Units
VOH Output HIGH Voltage VCC–1.145 VCC–0.895 V
VOL
Output LOW Voltage VCC–1.545 VCC–1.295 V
VOUT Output Voltage Swing see Figure 1a. 150 400 mV
VDIFF_OUT Differential Voltage Swing see Figure 1b. 300 800 mV
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. Due to the limited drive capability, use for input of the same package only.
4. Thermalperformanceassumesexposedpadissoldered(orequivalent)tothedevice’smostnegativepotential(GND)onthePCB.ψ
JB
uses 4-layer
θ
JA in still-air number unless otherwise stated.
5. ThecircuitisdesignedtomeettheDCspecicationsshownintheabovetableafterthermalequilibriumhasbeenestablished.
6. VIH (min) not lowers than 1.2V.
LVPECLDCELECTRICALCHARACTERISTICS(5)
Product specificaties
| Merk: | Microchip |
| Categorie: | Niet gecategoriseerd |
| Model: | SY58033U |
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