sy89809al Micrel Semiconductor, sy89809al Datasheet

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sy89809al

Manufacturer Part Number
sy89809al
Description
3.3v Lvpecl/hstl To Hstl 1 9 High- Performance Clock Driver With Lvttl Clock Select And Enable
Manufacturer
Micrel Semiconductor
Datasheet

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sy89809alTH
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Micrel Inc
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sy89809alTH TR
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General Description
The SY89809AL is a high-performance bus clock driver
with nine differential High-Speed Transceiver Logic (HSTL)
output pairs. The part is designed for use in low-voltage
(3.3V/1.8V) applications, which require a large number of
outputs to drive precisely aligned, ultra-low skew signals to
their destination. The input is multiplexed from either HSTL
or Low-Voltage Positive-Emitter-Coupled Logic (LVPECL)
by the CLK_SEL pin. The Output Enable (OE) is
synchronous
enabled/disabled when they are already in the LOW state.
This avoids any chance of generating a runt clock pulse
when the device is enabled/disabled as can happen with
an asynchronous control.
The SY89809AL features low pin-to-pin skew (15ps
typical) and low part-to-part skew (100ps typical). The
SY89809AL is available in a single space-saving package,
enabling a lower overall cost solution.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Block Diagram
Precision Edge is a registered trademark of Micrel, Inc.
July 2010
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
so
that
the
outputs
will
only
be
Features
• 3.3V core supply, 1.8V output supply for reduced power
• LVPECL and HSTL inputs
• Nine differential HSTL (low-voltage swing) output pairs
• HSTL outputs drive 50Ω-to-ground with no offset voltage
• 750MHz maximum clock frequency
• Low part-to-part skew (100ps typical)
• Low pin-to-pin skew (15ps typical)
• Available in 32-pin TQFP
Applications
• High-performance PCs
• Workstations
• Parallel processor-based systems
• Other high-performance computing
• Communications
Note:
1. The OE (output enable) signal is synchronized with the low level of
408
Level
HSTL
HSTL
LVPECL
LVCMOS/LVTTL
OE
0
0
1
1
the HSTL_CLK and LVPECL_CLK signal.
) 944-0800 • fax + 1 (408) 474-1000 •
Performance Clock Driver with LVTTL
(1)
3.3V LVPECL/HSTL to HSTL 1:9 High-
CLK_SEL
0
1
0
1
Clock Select and Enable
Table 1. Signal Groups
SY89809AL
Direction
Input
Output
Input
Input
Table 2. Truth Table
Q0 – Q8
LOW
LOW
HSTL_CLK
LVPECL_CLK
hbwhelp@micrel.com
Signal
HSTL_CLK, /HSTL_CLK
Q0 – Q8, /Q0 – /Q8
LVPECL_CLK, /LVPECL_CLK
CLK_SEL, OE
http://www.micrel.com
/Q0 – /Q8
HIGH
HIGH
/HSTL_CLK
/LVPECL_CLK
or (408) 955-1690
Precision Edge
M9999-070110
®

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sy89809al Summary of contents

Page 1

... General Description The SY89809AL is a high-performance bus clock driver with nine differential High-Speed Transceiver Logic (HSTL) output pairs. The part is designed for use in low-voltage (3.3V/1.8V) applications, which require a large number of outputs to drive precisely aligned, ultra-low skew signals to their destination. The input is multiplexed from either HSTL or Low-Voltage Positive-Emitter-Coupled Logic (LVPECL) by the CLK_SEL pin ...

Page 2

... July 2010 Operating Package Marking Range Commercial SY89809ALTZ with Pb-Free bar-line indicator Commercial SY89809ALTZ with Pb-Free bar-line indicator = 25°C, DC Electricals only. A 32-Pin TQFP (T32-1) Type Pin Function Differential clock input selected by CLK_SEL. Can be left floating if not selected. Floating input, if selected, produces a LOW at HSTL_CLK and a HSTL Input HIGH at /HSTL_CLK. HSTL input signal requires external termination 50Ω ...

Page 3

... ESR capacitors as close to V Output Buffer VCC connected to 1.8V supply. Bypass with 0.1µF in parallel VCC Output with 0.01µF low ESR capacitors as close to V Power pins should be connected together on the PCB. Ground Ground. 3 SY89809AL pin as possible. CCI pins as possible. All V CCO M9999-070110 hbwhelp@micrel.com or (408) 955-1690 CCO ...

Page 4

... JA –Still-Air.......................................................50°C/W –500lfpm .....................................................42°C/W TQFP (θ ) .........................................................20°C/W JC Min. Typ. 3.0 3.3 1.6 1.8 65 1.0 0.1 V +0.1 X –0.3 0.68 –350 –500 0.6 V – 1.145 CCI V – 1.945 CCI –150 –150 1.2 hbwhelp@micrel.com SY89809AL Max. Units 3 1.2 V 0 – µA µA 1 – 0.895 V CCI V – 1.695 V CCI 150 µ ...

Page 5

... SY89809AL Max. Units V 0.8 V 150 µA 300 µA Units 200 600 ps M9999-070110 or (408) 955-1690 ...

Page 6

... Micrel, Inc. Output Waveforms Figure 1. 100MHz Output Waveform Frequency vs. Amplitude 900 800 700 600 500 400 300 200 100 0 July 2010 Figure 2. 500MHz Output Waveform FREQUENCY (MHz) 6 hbwhelp@micrel.com SY89809AL M9999-070110 or (408) 955-1690 ...

Page 7

... Micrel, Inc. July 2010 Figure 3. Output Enable Timing Diagram 7 SY89809AL M9999-070110 hbwhelp@micrel.com or (408) 955-1690 ...

Page 8

... 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 July 2010 32-Pin TQFP (T32-1) indemnify Micrel for any damages resulting from such use or sale. © 2010 Micrel, Incorporated. 8 SY89809AL http://www.micrel.com M9999-070110 hbwhelp@micrel.com or (408) 955-1690 ...

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