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PDF SY75576L Data sheet ( Hoja de datos )
| Número de pieza | SY75576L | |
| Descripción | 267MHz 1:4 3.3V HCSL/LVDS Fanout Buffer | |
| Fabricantes | Micrel | |
| Logotipo |  |
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SY75576L
267MHz 1:4 3.3V HCSL/LVDS Fanout Buffer
PrecisionEdge™
General Description
The SY75576L is a high-speed, fully differential 1:4 clock
fanout buffer optimized to provide four identical output
copies with 137fs phase jitter and maximum 50ps output-
to-output skew. Designed to be used with PCI-Express
applications, SY75576L accepts and outputs HCSL or
LVDS logic levels.
The SY75576L operates from a 3.3V ±5% power supply
and is guaranteed over the full industrial temperature
range (−40°C to +85°C). It is available in a 20-pin TSSOP
lead-free package.
The SY75576L is part of Micrel’s high-speed, ultra-low
jitter, PrecisionEdge™ product line.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Functional Block Diagram
Features
• Four differential pairs of LVDS or HCSL outputs
• Two pairs of differential inputs accept LVDS or HCSL
logic levels
• 267MHz max HCSL frequency
• 100MHz max LVDS frequency
• Ultra low phase jitter:
− 137fsrms, 200MHz (12kHz–20MHz)
− 153fsrms, 156.25MHz (12kHz–20MHz)
− 212fsrms, 100MHz (12kHz–20MHz)
• <2ps Total_Jitterpk-pk, 200MHz (BER = 10−12)
• 50ps output-to-output skew
• 3.3V ±5% power supply operation
• −40°C to +85°C operating temperature
• Available in 20-pin TSSOP lead-free package
Applications
• Clock distribution
• PCI-Express
• Servers
• Switches
• Routers
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
July 2, 2013
Revision 1.0
[email protected] or (408) 955-1690
Free Datasheet http://www.datasheet4u.com/
1 page  
Micrel, Inc.
SY75576L
AC Electrical Characteristics(6)
VDD = VDDIN = 3.135V to 3.465V, TA = −40°C to +85°C, unless otherwise stated.
Symbol
Parameter
Condition
Min. Typ.
Max.
Units
fMAX Maximum Frequency
HCSL Termination
LVDS Termination
267 MHz
100 MHz
tPD
tSkew
Propagation Delay
Output-to-Output skew
Note 11
Notes 12, 13
2 ns
50 ps
tR, tF
Output Rise/Fall Times
0.175V to 0.525V / 0.525V to 0.175V
At full output swing.
50Ω, 2pF
175 338
700
ps
tR/F_var
Rise/Fall Time Variation
At full output swing.
50Ω, 2pF
125 ps
TRJ_Jitter
Phase Jitter
At 200MHz
At 156.25MHz
137 fsrms
153 fsrms
TTJ_Jitter
Total Jitter
At 100MHz
BER = 10-12, TDJ = 0, at 200MHz
212
2
fsrms
ps
TOE_enable
Output Enable Time
All Outputs
2 µs
TOE_disable
Output Disable Time
All Outputs
10 ns
TDCY
Duty Cycle
45 50
55
%
Notes:
11. Measured from the differential input crossing point to the differential output crossing point.
12. Output-to-Output skew is the difference in time between outputs, receiving data from the same input, for the same temperature, voltage, and
transition.
13. This parameter is defined in accordance with JEDEC Standard 65.
Jitter Analysis
Jitter is defined as the deviation of a signal from its ideal
position. Phase noise is the presence of signal energy at
frequencies other than the carrier. Random jitter has a
Gaussian distribution and is specified as an rms unit,
which is one standard deviation of the distribution. Since
Gaussian distribution is unbounded in an infinite sample,
no communication system can be completely error free.
Instead, communication links are rated with a maximum bit
error rate (BER), which is typically around 10-12 for high-
speed communication equipment. Achieving a desired
BER requires accounting for a number of standard
deviations of random noise by using the appropriate value
for N (see Table 1) in the formula in Equation 1.
Tj = N × Rj + Dj
Eq. 1
Where Tj is total jitter, Rj is random jitter, and Dj is
deterministic jitter. If routing clock signals, the deterministic
jitter is usually negligible and the Tj is dominated by the
random jitter. Calculating Tj from Rj using Equation 1 gives
the values in Table 1.
Table 1. Standard Deviations of Random Noise
BER
10-10
10-11
10-12
10-13
N
12.723
13.412
14.069
14.698
Rj at 200MHz
137fs_rms
137fs_rms
137fs_rms
137fs_rms
Tj at 200MHz
1.743ps
1.837ps
1.927ps
2.013ps
July 2, 2013
5 Revision 1.0
[email protected] or (408) 955-1690
Free Datasheet http://www.datasheet4u.com/
5 Page 
Micrel, Inc.
Package Information(14)
SY75576L
20-Pin TSSOP
Note:
14. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com.
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
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.
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.
© 2013 Micrel, Incorporated.
July 2, 2013
11 Revision 1.0
[email protected] or (408) 955-1690
Free Datasheet http://www.datasheet4u.com/
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