Product category:
Standard Logic Devices
News Release from: Micrel | Subject: SY89228-231 divider product family
Edited by the Electronicstalk Editorial
Team on 07 December 2007
Clock dividers take odd approach to
stability
Divide by three and divide by five clock dividers are the only clock dividers that divide odd numbers and provide 50% duty cycle.
Micrel has added four new divide-by-three and divide-by-five clock dividers to its clock divider product family The SY89228 and 229 are 1GHz LVPECL/LVDS dividers that feature failsafe input (FSI) circuitry, and the SY89230 and 231 are 3.2GHz LVPECL/LVDS dividers
This article was originally published on Electronicstalk on 5 Dec 2000 at 8.00am (UK)
Related stories
World's simplest buck regulator boosted to 2A
Micrel has boosted the output capability of the industry's simplest surface-mount DC/DC switching convertor to 2A while retaining the device's original SO-8 packaging.
Dual and triple 135MHz low-power op amps
Consuming just 2.4mA per op amp, the MIC915 dual and MIC916 triple op amps extend Micrel's premier family of high-speed, low-power op amps for power-sensitive high-speed applications.
Targeted applications include prescaling functions, PLL clock generation and distribution, RF transmitters, and wireless basestations.
All devices are currently in volume production with pricing for 1000-unit quantities starting at US $2.69.
In addition, free evaluation boards are also available.
Further reading
Li-Ion battery charger IC
The high accuracy of Micrel's new MIC79050 single-cell Li-Ion battery charger IC ensures that each cell is charged to its fullest capacity to provide the longest possible operating time.
Micrel expands ECL Pro logic family
Three new ultra-high-speed devices have been added to Micrel Semiconductor's growing portfolio of communications solutions in the company's proprietary ECL Pro logic family.
High-speed op amps draw only 1.25mA
New from Micrel Semiconductor, the MIC911 and MIC914 are high-speed low-power operation amplifiers capable of driving very high capacitance loads.
"These new divide by three and divide by five clock dividers are the only clock dividers that divide 'odd' numbers and provide 50% duty cycle currently on the market", says Thomas S Wong, Vice President High Bandwidth Products, Micrel.
"The SY89228 and 229 offer our very own FSI feature, which provides a simple, integrated, transparent solution for hot swap or failed input conditions".
"This is particularly important for the prevention of unstable output conditions in rack-based equipment that must continue to operate while servicing I/O cards".
The new devices are unique in that they are odd dividers, but provide a 50% duty cycle when the input clock has a 50% duty cycle.
Most dividers in the industry are even dividers, which require two times the starting frequency in order to provide a 50% duty cycle at the output.
Moreover, the Micrel devices are offered in an ultrasmall 16-pin MLF package that saves critical space while providing excellent performance.
The SY89228U and SY89229U, along with the rest of the FSI family of solutions, are optimised to prevent unwanted oscillations and maintain output stability when an input signal's swing collapses or disappears.
Unlike existing LVPECL or LVDS dividers currently on the market, Micrel's FSI family prevents a metastable output condition when the input signal is removed or the amplitude fails.
This is especially crucial for rack-based equipment that has many I/O cards requiring Hot Swap capability.
In addition, the SY89228-231 divider product family offers Micrel's patented 3-pin internal input termination, which simplifies designs and interfaces to any differential signal, AC- or DC-coupled, without any level shifting or termination resistor networks in the signal path.
AC performance is guaranteed from DC through 1GHz, with rise and fall times less than 270ps for the SY89228 and SY89229 LVPECL and LVDS outputs, respectively.
Additionally, AC performance is guaranteed from DC through 3.2GHz, with rise and fall times less than 200ps for the SY89230 and SY89231 LVPECL and LVDS outputs, respectively.
The SY89228-231 divider product family guarantees jitter performance to be less than 10ps peak-peak over temperature and voltage, operation over the full industrial temperature range (-40 to +85C), and supply voltage operation from 2.5 to 3.3V.
All solutions are available in MLF packaging, which features low inductance and capacitance, making the SY89228-231 divider series ideal for today's high-speed, low jitter designs.
• Micrel: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
