SY58607U

SY58607U
3.2Gbps Precision, 1:2 LVPECL Fanout
Buffer with Internal Termination and Fail
Safe Input
General Description
The SY58607U is a 2.5/3.3V, high-speed, fully
differential 1:2 LVPECL fanout buffer optimized to
provide two identical output copies with less than 20ps
of skew and less than 10pspp total jitter. The SY58607U
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 outputs are 800mV LVPECL, with extremely fast
rise/fall times guaranteed to be less than 110ps.
The SY58607U 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 SY58606U and SY58608U, 1:2 fanout buffers with
400mV and 325mV output swings respectively. The
SY58607U 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 1:2, 800mV LVPECL fanout buffer
• Guaranteed AC performance over temperature and
voltage:
– DC-to > 3.2Gbps throughput
– <350ps propagation delay (IN-to-Q)
– <20ps within-device skew
– <110ps rise/fall times
• Fail Safe Input
– Prevents outputs from oscillating when input is
invalid
• Ultra-low jitter design
– 85fs RMS phase 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 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
Precision Edge is a registered trademark 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
Oct. 1, 2013
M9999-082907-B
[email protected] or (408) 955-1690
Micrel, Inc.
SY58607U
Ordering Information(1)
Part Number
Package
Type
Operating
Range
Package Marking
Lead
Finish
SY58607UMG
QFN-16
Industrial
607U with Pb-Free
bar-line indicator
NiPdAu
Pb-Free
QFN-16
Industrial
607U with Pb-Free
bar-line indicator
NiPdAu
Pb-Free
(2)
SY58607UMGTR
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
Pin Description
Pin Number
Pin Name
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.
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.
4
VREF-AC
Reference Voltage: This output biases to VCC–1.2V. It is 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. Maximum sink/source current is ±1.5mA.
See “Input Interface Applications” subsection.
5, 8,13, 16
VCC
Positive Power Supply: Bypass with 0.1uF//0.01uF low ESR capacitors as close to
the VCC pins as possible.
GND,
Ground: Exposed pad must be connected to a ground plane that is the same
potential as the ground pins.
6, 7, 14, 15
Exposed pad
9, 10
/Q1, Q1
11, 12
/Q0, Q0
Oct. 1, 2013
Pin Function
LVPECL Differential Output Pairs: Differential buffered copies of the input signal.
The output swing is typically 800mV. Unused output pair may be left floating with
no impact on jitter. See “LVPECL Output Termination” subsection.
2
M9999-082907-B
[email protected] or (408) 955-1690
Micrel, Inc.
SY58607U
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VCC) ............................... –0.5V to +4.0V
Input Voltage (VIN) ....................................... –0.5V to VCC
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)
(4)
Source or sink current on VREF-AC .............. ±1.5mA
Maximum operating Junction Temperature .......... 125°C
Lead Temperature (soldering, 20sec.) .................. 260°C
Storage Temperature (Ts) .................... –65°C to +150°C
Supply Voltage (VIN) ........................ +2.375V to +3.60V
Ambient Temperature (TA) ................... –40°C to +85°C
(3)
Package Thermal Resistance
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
VCC
Power Supply Voltage Range
ICC
Power Supply Current
RDIFF_IN
Differential Input Resistance
(IN-to-/IN)
VIH
Input HIGH Voltage
(IN, /IN)
IN, /IN, Note 7
VIL
Input LOW Voltage
(IN, /IN)
IN, /IN
VIN
Input Voltage Swing
(IN, /IN)
see Figure 3a, Note 6
VDIFF_IN
Differential Input Voltage Swing
(|IN - /IN|)
see Figure 3b
VIN_FSI
Input Voltage Threshold that
Triggers FSI
VREF-AC
Output Reference Voltage
Min
Typ
Max
Units
2.375
3.0
2.5
3.3
2.625
3.6
V
40
60
mA
100
110
Ω
VCC–1.6
VCC
V
0
VIH–0.1
V
0.1
1.7
V
No load, max. VCC
90
0.2
VCC–1.3
IN to VT
V
30
100
mV
VCC–1.2
VCC–1.1
V
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. 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.
6. VIN (max) is specified when VT is floating.
7. VIH (min) not lower than 1.2V.
Oct. 1, 2013
3
M9999-082907-B
[email protected] or (408) 955-1690
Micrel, Inc.
SY58607U
LVPECL Outputs DC Electrical Characteristics(7)
VCC = +2.5V ±5% or +3.3V ±10%, RL = 50Ω to VCC-2V; TA = –40°C to +85°C, unless otherwise stated.
Symbol
Parameter
Condition
Max
Units
VOH
Output HIGH Voltage
Q0, /Q0, Q1, /Q1
VCC-1.145
Min
Typ
VCC -0.895
V
VOL
Output LOW Voltage
Q0, /Q0, Q1, /Q1
VCC-1.945
VCC-1.695
V
VOUT
Output Voltage Swing
See Figure 3a
550
800
950
mV
VDIFF_OUT
Differential Output Voltage Swing
See Figure 3b
1100
1600
mV
Notes:
7. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
Oct. 1, 2013
4
M9999-082907-B
[email protected] or (408) 955-1690
Micrel, Inc.
SY58607U
AC Electrical Characteristics
VCC = +2.5V ±5% or +3.3V ±10%, RL = 50Ω to VCC-2V, Input tr/tf: <300ps; TA = –40°C to +85°C, unless otherwise
stated.
Symbol
Parameter
Condition
Min
Typ
fMAX
Maximum Frequency
NRZ Data
3.2
4.25
Gbps
2.5
3
GHz
VIN: 100mV-200mV
180
300
450
ps
VIN: 200mV-800mV
150
230
350
ps
4
20
ps
135
ps
VOUT > 400mV
tPD
Propagation Delay
tSkew
tJitter
IN-to-Q
Within Device Skew
Note 8
Part-to-Part Skew
Note 9
RMS Phase Jitter
Output = 622MHz
Clock
Max
Units
85
fs
Integration Range 12kHz – 20MHz
tr, tf
Output Rise/Fall Time
(20% to 80%)
At full output swing.
Duty Cycle
Differential I/O
40
47
75
110
ps
53
%
Notes:
8.
Within device skew is measured between two different outputs under identical input transitions.
9.
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.
Oct. 1, 2013
5
M9999-082907-B
[email protected] or (408) 955-1690
Micrel, Inc.
SY58607U
Functional Description
Input Clock Failure Case
If the input clock fails to a floating, static, or extremely
low signal swing, the FSI function will eliminate a
metastable condition and guarantee a stable output.
No ringing and no undetermined state will occur at the
output under these conditions.
Note that the FSI function will not prevent duty cycle
distortion in case of a slowly deteriorating (but still
toggling) input signal. Due to the FSI function, the
propagation delay will depend on rise and fall time of
the input signal and on its amplitude. Refer to “Typical
Characteristics” for detailed information.
Fail-Safe Input (FSI)
The input includes a special failsafe circuit to sense
the amplitude of the input signal and to latch the
outputs when there is no input signal present, or
when the amplitude of the input signal drops
sufficiently below 100mVPK (200mVPP), typically
30mVPK. Maximum frequency of SY58607U is limited
by the FSI function.
Timing Diagrams
Figure 1a. Propagation Delay
Figure 1b. Fail Safe Feature
Oct. 1, 2013
6
M9999-082907-B
[email protected] or (408) 955-1690
Micrel, Inc.
SY58607U
Typical Characteristics
VCC = 3.3V, GND = 0V, VIN = 100mV, RL = 50Ω to VCC-2V, TA = 25°C, unless otherwise stated.
Oct. 1, 2013
7
M9999-082907-B
[email protected] or (408) 955-1690
Micrel, Inc.
SY58607U
Functional Characteristics
23
VCC = 3.3V, GND = 0V, VIN = 400mV, Data Pattern: 2 -1, RL = 50Ω to VCC-2V, TA = 25°C, unless otherwise stated.
Oct. 1, 2013
8
M9999-082907-B
[email protected] or (408) 955-1690
Micrel, Inc.
SY58607U
Functional Characteristics (continued)
VCC = 3.3V, GND = 0V, VIN = 400mV, RL = 50Ω to VCC-2V, TA = 25°C, unless otherwise stated.
Oct. 1, 2013
9
M9999-082907-B
[email protected] or (408) 955-1690
Micrel, Inc.
Input and Output Stage
SY58607U
Single-Ended and Differential Swings
Figure 3a. Single-Ended Voltage Swing
Figure 2a. Simplified Differential Input Buffer
Figure 3b. Differential Voltage Swing
Figure 2b. Simplified LVPECL Output Buffer
Oct. 1, 2013
10
M9999-082907-B
[email protected] or (408) 955-1690
Micrel, Inc.
SY58607U
Input Interface Applications
Figure 4a. CML Interface
(DC-Coupled)
Figure 4b. CML Interface
(AC-Coupled)
Figure 4c. LVPECL Interface
(DC-Coupled)
Option: May connect VT to VCC
Figure 4d. LVPECL Interface
(AC-Coupled)
Oct. 1, 2013
Figure 4e. LVDS Interface
11
M9999-082907-B
[email protected] or (408) 955-1690
Micrel, Inc.
SY58607U
LVPECL Output Termination
LVPECL outputs have very low output impedance
(open emitter), and small signal swing which results in
low EMI. LVECL is ideal for driving 50Ω-and-100Ωcontrolled impedance transmission lines. There are
several techniques in terminating the LVPECL output,
as shown in Figures 5a through 5c.
R1
Figure 5b. Three-Resistor “Y-Termination”
Figure 5a. Parallel Termination-Thevenin Equivalent
Related Product and Support Documents
Part Number
Function
Data Sheet Link
SY58606U
4.25Gbps Precision, 1:2 CML Fanout Buffer with
Internal Termination and Fail Safe Input
http://www.micrel.com/page.do?page=/productinfo/products/sy58606u.shtml
SY58608U
3.2Gbps Precision, 1:2 LVDS Fanout Buffer Buffer
with Internal Termination and Fail Safe Input
http://www.micrel.com/page.do?page=/productinfo/products/sy58608u.shtml
HBW Solutions
New Products and Termination Application Notes
http://www.micrel.com/page.do?page=/productinfo/as/HBWsolutions.shtml
Oct. 1, 2013
12
M9999-082907-B
[email protected] or (408) 955-1690
Micrel, Inc.
SY58607U
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
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for
its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
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. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk
and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale.
© 2006 Micrel, Incorporated.
Oct. 1, 2013
13
M9999-082907-B
[email protected] or (408) 955-1690