Instrukcja obsługi Microchip SY58604U

Microchip nieskategoryzowany SY58604U

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SY58604U
3.2Gbps Precision, LVPECL Buffer with
Internal Termination and Fail Safe Input
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
General Description
The SY58604U is a 2.5/3.3V, high-speed, fully
differential LVPECL buffer optimized to provide only
108fsRMS phase jitter. The SY58604U can process clock
signals as fast as 2.5GHz or data patterns up to
3.2Gbps.
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
voltage reference (VREF-AC) is provided to bias the VT pin.
The output is 800mV LVPECL, with extremely fast
rise/fall times guaranteed to be less than 110ps.
The SY58604U 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
the SY58603U and the SY58605U, buffers with 400mV
and 325mV output swings respectively. The SY58604U
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
•Precision 800mV LVPECL buffer
•Ultra-low jitter design
– 108fsRMS phase jitter
•Guaranteed AC performance over temperature and
voltage:
– DC-to > 3.2Gbps throughput
– <350ps typical propagation delay (IN-to-Q)
– <110ps rise/fall times
•Fail Safe Input
– Prevents output from oscillating when input is
invalid
•High-speed LVPECL output
•2.5V ±5% or 3.3V ±10% power supply operation
•Industrial temperature range: –40°C to +85°C
•Available in 8-pin (2mm x 2mm) DFN package
Applications
•All SONET clock and data 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
•Access
•Metro area network equipment
September 2011 M9999-092911-D
hbwhelp@micrel.com or (408) 955-1690
Precision Edge is a registered trademark of Micrel, Inc.
Micrel, Inc. SY58604U
September 2011 2 M9999-092911-D
hbwhelp@micrel.com
Ordering Information(1)
Part Number Package Type Operating Range Package Marking
SY58604UMG DFN-8 Industrial 604 with Pb-Free
bar-line indicator
SY58604UMGTR(2) DFN-8 Industrial 604 with Pb-Free
bar-line indicator
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A = 25°C, DC Electricals only.
2. Tape and Reel.
Pin Configuration
8-Pin DFN
Pin Description
Pin Number Pin Name Pin Function
1, 4 IN, /IN Differential Input: This input pair is the differential signal input to the device. Input
accepts DC-Coupled differential signals as small as 100mV
(200mVpp). Each pin of
this pair internally terminates with 50Ω to the 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. See “Input Interface
Applications” subsection for more details.
2 VT Input Termination Center-Tap: Each input terminates to this pin. The VT pin
provides a center-tap for each input (IN, /IN) to a termination network for maximum
interface flexibility. See “Input Interface Applications” subsection.
3 VREF-AC Reference Voltage: This output biases to V
CC
–1.2V. It is used for AC-coupling inputs
IN and /IN. Connect VREF-AC directly to the VT pin. Bypass with 0.01µF low ESR
capacitor to VCC. Maximum sink/source current is ±1.5mA. See “Input Interface
Applications” subsection for more details.
5 GND,
Exposed pad
Ground: Exposed pad must be connected to a ground plane that is the same
potential as the ground pin.
6, 7 /Q, Q LVPECL Differential Output Pair: Differential buffered output copy of the input
signal. The output swing is typically 800mV. See “LVPECL Output Termination”
subsection.
8 VCC Positive Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to
the VCC pin as possible.
or (408) 955-1690
Micrel, Inc. SY58604U
September 2011 3 M9999-092911-D
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 VCC+0.5V
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) ............±1.5mA
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)
DFN
Still-air (θJA
) ............................................ 93°C/W
Junction-to-board (ΨJB).......................... 56°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 30 45 mA
RDIFF_IN Differential Input Resistance
(IN-to-/IN)
90 100 110 Ω
V
IH Input HIGH Voltage
(IN, /IN) IN, /IN, Note 7 V
CC –1.6 VCC V
V
IL Input LOW Voltage
(IN, /IN) IN, /IN 0 VIH–0.1 V
V
IN Input Voltage Swing
(IN, /IN)
see Figure 3a, Note 6 0.1 1.7 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 Output Reference Voltage V
CC –1.3 VCC–1.2 VCC–1.1 V
V
T_IN Voltage from Input to VT 1.28 V
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.

Specyfikacje produktu

Marka: Microchip
Kategoria: nieskategoryzowany
Model: SY58604U

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