Microchip SY58610U Bedienungsanleitung

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SY58610U
3.2Gbps Precision, LVPECL 2:1 MUX with
Internal Termination and Fail Safe Input
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944 0800 • f- ax + 1 (408) 474 000 • http://www.micrel.com-1
August 2007 M9999 082907- -C
hbwhelp@micrel.com -or (408) 955 1690
General Description
The SY58610U is a 2.5/3.3V, high speed, fully -
differential LVPECL 2:1 MUX capable of processing
clock signals up to 2.5GHz and data patterns up to
3.2Gbps. The SY58610U is optimized to provide a
buffered output of the selected input with less than
10pspp total jitter.
The differential input includes Micrel’s unique, 3-pin
input termination architecture that interfaces to LVPECL,
LVDS or CML differential signals, (AC or DC- -coupled)
as small as 100mV (200mVPP) without any level- shifting
or termination resistor networks in the signal path. For
AC-coupled input interface applications, an integrated
reference voltage (VREF-AC) is provided to bias the VT pin.
The outputs are 800mV LVPECL, with extremely fast
rise/fall times guaranteed to be less than 130ps.
The SY58610U 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 CML or LVDS outputs, consider
Micrel’s SY58609U and SY58611U, 2:1 MUX with
400mV and 325mV output swings, respectively. The
SY58610U 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.
Functional Block Diagram
Precision Edge®
Features
Pr ecision 800mV LVPECL 2:1 MUX
Guaranteed AC performance over temperature and
voltage:
-DC to > 3.2Gbps throughput
- -<370ps propagation delay (IN to Q)
<130ps rise/fall times
Fail Safe Input
Prevents outputs from oscillating when input is
invalid
Unique, patented MUX input isolation design
minimizes adjacent channel crosstalk
Ultra-low jitter design
– <1psRMS - -cycle to cycle jitter
– <10psPP total jitter
– <1psRMS random jitter
– <10psPP deterministic jitter
High-speed LVPECL outputs
2.5V ±5% or 3.3V ±10% power supply operation
Industrial temperature range: –40°C to +85°C
Available in 16-pin (3mm x 3mm) QFN package
Applications
All SONET clock distribution
Fibre Channel clock and data distribution
Gigabit Ethernet clock and data distribution
Backplane distribution.
Markets
Storage
ATE
Test and measurement
Enterprise networking equipment
High-end servers
Precisi Edge is egister trademark f icrel, Inc.on a r ed o M
Micrel, Inc.
SY58610U
August 2007 2 M9999 082907- -C
hbwhelp@micrel.com or (408) 955-1690
Ordering Information(1)
Part Number Package
Type
Operating
Range
Package Marking Lead
Finish
SY58610UMG 16 -QFN Industrial 610U with Pb- Free
bar-line indicator
NiPdAu
Pb- Free
SY58610UMGTR(2) - QFN 16 Industrial 610U 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 Conguration Truth Table
16-Pin QFN
SEL Output
0 IN0 Selected
1 IN1 Selected
Pin Description
Pin Number Pin Name Pin Function
1, 4
VT0, VT1 Input Termination Center : Each side of the differential input pair terminates to the VT pin. -Tap
This pin provides a center tap to a termination network for maximum interface flexibility. See -
“Input Interface Applications” subsection.
2, 3 VREF-AC0,
VREF- AC1
Reference Voltage: These outputs bias to V
CC1.2V. They are used for AC-coupling inputs IN
and /IN. Connect VREF AC directly to the corresponding VT pin. Bypass with 0.01µF low ESR -
capacitor to VCC. Due to limited drive capability, the VREF-AC pin is only intended to drive its
respective VT pin. Maximum sink/source current is ±0.5mA. See “Input Interface Applications”
subsection.
5, 6
15, 16
IN1, /IN1
IN0, /IN0
Differential Inputs: These input pairs are the differential signal inputs to the device. Inputs
accept DC Coupled dif- ferential signals as small as 100mV
(200mVpp). Each pin of the pairs
internally terminates with 50Ω to the corresponding VT pin. If the input swing falls below a
certain threshold (typical 30mV), the Fail Safe Input (FSI) feature will guarantee a stable output
by latching the output to its last valid state. SeeInput Interface Applications” subsection.
7 SEL -Single Ended Input: This single ended TTL/CMOS compatible input selects the inputs to the - -
multiplexer. Note that this input is internally connected to a 25kΩ pull-up resistor and will
default to logic HIGH state if left open. The input-switching threshold is V
CC/2.
8, 13 Positive Power Supply: Bypass with 0.1uF//0.01uF low ESR capacitors as close to the V VCC CC
pins as possible.
9, 12 Differential Output Pair: Differential buffered output copy of the selected input signal. LVPECL /Q, Q
The output swing is typically 800mV. Unused output pair may be left floating with no impact on
jitter. SeeLVPECL Output Termination” subsection.
10, 11 GND,
Exposed Pad
Ground. Exposed pad must be connected to a ground plane that is the same potential as the
ground pins.
14 NC No connect.
Micrel, Inc.
SY58610U
August 2007 3 M9999 082907- -C
hbwhelp@micrel.com or (408) 955-1690
Absolute Maximum Ratings(1)
Supply Voltage (VCC) ............................... 0.5V to +4.0V
Input Voltage (VIN) ....................................... –0.5V to V
CC
LVPECL Output Current(IOUT)
Continuous....................................................... 50mA
Surge .............................................................100mA
Current (VT)
Source or sink on VT pin .............................±100mA
Input Current
Source or sink Current on (IN, /IN) ................ ±50mA
Current (VREF)
Source or sink current on VREF-AC
(4) .............. ±0.5mA
Maximum operating Junction Temperature ......... 125°C
Lead Temperature (soldering, 20sec.) .................. 260°C
Storage Temperature (Ts) .................... 65°C to +150°C
Operating Ratings(2)
Supply Voltage (VIN) ........................ +2.375V to +3.60V
Ambient Temperature (TA
) ................... 40°C to +85°C
Package Thermal Resistance(3)
QFN
Still-air (θJA
) ............................................ 60°C/W
Junction- -to board (ψJB) ......................... 33°C/W
DC Electrical Characteristics(5)
TA = 40°C to +85°C, unless otherwise stated.
Symbol Parameter Condition Min Typ Max Units
V
CC Power Supply Voltage Range 2.375
3.0
2.5
3.3
2.625
3.6
V
ICC Power Supply Current No load, max. VCC 40 50 mA
RDIFF_IN Differential Input Resistance
(IN- - to /IN)
90 100 110
V
IH Input HIGH Voltage
(IN, /IN)
IN, /IN, Note 7 VCC- V1.6 CC V
V
IL Input LOW Voltage
(IN, /IN)
IN, /IN 0.2 VIH V 0.1
V
IN Input Voltage Swing
(IN, /IN)
see Figure 3a, Note 6 0.1 1.0 V
V
DIFF_IN Differential Input Voltage Swing
(|IN - /IN|)
see Figure 3b 0.2 V
V
IN_FSI Input Voltage Threshold that
Triggers FSI
30 100 mV
V
REF AC- AC Reference Voltage V
CC- V1.3 CC
- V 1.0
V
T_IN Voltage from Input to VT V 1.28
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 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.
6. VIN (max) is specified when V
T is floating.
7. VIH (min) not lower than 1.2V.

Produktspezifikationen

Marke: Microchip
Kategorie: Nicht kategorisiert
Modell: SY58610U

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