Programmable Clocks Enable Reduced Component Count and Design Time

Page Contents:	[ ICS251 | ICS252 | ICS270 | ICS271 | ICS275 | ICS276 | ICS280 | ICS281 | ICS290 | ICS291 ]
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Electronic systems continue to incorporate new functionality, while being forced into ever decreasing board-space allocations. Designers validate the interoperability of these new system requirements in unconstrained breadboards, but the productization challenge is to maintain proper timing between the various subsystems, while consolidating components to save cost, space and power. An obvious component to consider is a programmable timing device to eliminate discrete crystals, oscillators and other clock devices.

From the leader in timing solutions, the IDT VersaClock™ one-time programmable (OTP) EPROM timing devices and accompanying easy-to-use software provides system-specific solutions without the need for prior PLL expertise.

An individual programmable clock device can provide up to 6 different output frequencies simultaneously from a single crystal or clock input. The IDT VersaClock software minimizes the number of PLLs, thereby reducing power consumption and output jitter in the design. Each output is provided with a color bar solution grade to allow designers the opportunity to quickly trade off clock accuracy for jitter performance.

Additional functionality is incorporated into the IDT VersaClock devices to allow low skew clock fan-outs, EMI reducing spread spectrum frequency modulation or VCXO input voltage control for those applications that must lock to external system clocks. Output VDD control provides the ability to drive outputs between 1.8 – 3.3V.

Most of the IDT VersaClock devices have multiple address registers, allowing processor control of output frequencies. This function may be used to provide different system speed/power modes, to turn off unused subsystems, to provide multi-regional support or to just consolidate multiple projects on a single device. Since all address registers may be independently configured – including input frequency – addresses may be allocated to different projects.

The table will help you select the device that best suits your application.

 

All devices are available in commercial and industrial temperature ranges, as well as RoHS-compliant packaging.

IDT VersaClock™ timing devices and software easily takes designs from prototype to manufacture

• Simplify timing schemes
• Consolidate crystals, oscillators, clock buffers and EMI reducing spread spectrum synthesizers into one device
• Easy-to-use software optimizes design and provides feedback for performance trade offs

 

 

ICS251
The ICS251 is a low cost, single-output, field programmable clock synthesizer. The ICS251 can generate an output frequency from 314kHz to 200MHz and may employ Spread Spectrum techniques to reduce system electro-magnetic interference (EMI). Using ICS' VersaClock™ software to configure the PLL and output, the ICS251 contains a One-Time Programmable (OTP) ROM to allow field programmability. Programming features include 4 selectable configuration registers. The device employs Phase-Locked Loop (PLL) techniques to run from a standard fundamental mode, inexpensive crystal, or clock. It can replace multiple crystals and oscillators, saving board space and cost. The device also has a power-down feature that tri-states the clock outputs and turns off the PLLs when the PDTS pin is taken low. The ICS251 is also available in factory programmed custom versions for high-volume applications.

 

 

ICS252
The ICS252 is a low cost, dual-output, field programmable clock synthesizer. The ICS252 can generate two output frequencies from 314kHz to 200MHz using up to two independently configurable PLLs. The outputs may employ Spread Spectrum techniques to reduce system electro-magnetic interference (EMI). Using ICS' VersaClock™ software to configure the PLL and output, the ICS252 contains a One-Time Programmable (OTP) ROM to allow field programmability. Programming features include 4 selectable configuration registers. The device employs Phase-Locked Loop (PLL) techniques to run from a standard fundamental mode, inexpensive crystal, or clock. It can replace multiple crystals and oscillators, saving board space and cost. The device also has a power-down feature that tri-states the clock outputs and turns off the PLLs when the PDTS pin is taken low. The ICS252 is also available in factory programmed custom versions for high-volume applications.

 

Features 8 pin SOIC package Two addressable registers Input crystal frequency of 5 to 27MHz Clock input frequency of 3 to 150MHz Output clock frequencies up to 200MHz Configurable Spread Spectrum Modulation Operating voltage of 3.3V Replaces multiple crystals and oscillators Controllable output drive levels Advanced, low-power CMOS process Available in RoHS 5 (green) or RoHS 6 (green and lead free) compliant package

 

 

ICS270
The ICS270 field programmable VCXO clock synthesizer generates up to eight high-quality, high-frequency clock outputs including multiple reference clocks from a low-frequency crystal input. It is designed to replace crystals and crystal oscillators in most electronic systems.

Using ICS' VersaClock™ software to configure PLLs and outputs, the ICS270 contains a One-Time Programmable (OTP) ROM for field programmability. Programming features include VCXO, eight selectable configuration registers and up to two sets of four low-skew outputs.

Using Phase-Locked Loop (PLL) techniques, the device runs from a standard fundamental mode, inexpensive crystal, or clock. It can replace VCXOs, multiple crystals and oscillators, saving board space and cost.

The ICS270 is also available in factory programmed custom versions for high-volume applications.

 

Features Packaged as 20 pin TSSOP Eight addressable registers Replaces multiple crystals and oscillators Output frequencies up to 200MHz at 3.3V Input crystal frequency of 5 to 27MHz Up to eight reference outputs Up to two sets of four low-skew outputs Operating voltages of 3.3V Controllable output drive levels Advanced, low-power CMOS process Available in Pb (lead) free packaging

 

 

ICS271
The ICS271 field programmable VCXO clock synthesizer generates up to six high-quality, high-frequency clock outputs including multiple reference clocks from a low-frequency crystal input. It is designed to replace crystals and crystal oscillators in most electronic systems.

Using the IDT VersaClock™ software to configure PLLs and outputs, the ICS271 contains a One-Time Programmable (OTP) ROM for field programmability. Programming features include VCXO, eight selectable configuration registers and up to two sets of three low-skew outputs.

Each of the two output groups are powered by a separate VDDO voltage. VDDO may vary from 1.8 V to VDD. Using Phase-Locked Loop (PLL) techniques, the device runs from a standard fundamental mode, inexpensive crystal, or clock. It can replace VCXOs, multiple crystals and oscillators, saving board space and cost.

The ICS271 is also available in factory programmed custom versions for high-volume applications.

 

Features Packaged as 20 pin TSSOP Eight addressable registers Replaces multiple crystals and oscillators Output frequencies up to 200MHz at 3.3V Input crystal frequency of 5 to 27MHz Up to six reference outputs Separate 1.8 to 3.3V VDDO output level controls for each bank of 3 outputs Up to two sets of three low-skew outputs Operating voltages of 3.3V Controllable output drive levels Advanced, low-power CMOS process Available in Pb (lead) free packaging

 

 

ICS275
The ICS275 field programmable VCXO clock synthesizer generates up to four high-quality, high-frequency clock outputs including multiple reference clocks from a low-frequency crystal input. It is designed to replace crystals and crystal oscillators in most electronic systems.

Using ICS' VersaClock™ software to configure PLLs and outputs, the ICS275 contains a One-Time Programmable (OTP) ROM for field programmability. Programming features include VCXO, eight selectable configuration registers and up to two sets of two low-skew outputs.

Using Phase-Locked Loop (PLL) techniques, the device runs from a standard fundamental mode, inexpensive crystal, or clock. It can replace VCXOs, multiple crystals and oscillators, saving board space and cost.

The ICS275 is also available in factory programmed custom versions for high-volume applications.

 

Features Packaged as 16 pin TSSOP Eight addressable registers Replaces multiple crystals and oscillators Output frequencies up to 200MHz at 3.3V Input crystal frequency of 5 to 27MHz Up to four reference outputs Up to two sets of two low-skew outputs Operating voltages of 3.3V Controllable output drive levels Advanced, low-power CMOS process Available in Pb (lead) free packaging

 

 

ICS276
The ICS276 field programmable VCXO clock synthesizer generates up to three high-quality, high-frequency clock outputs including multiple reference clocks from a low-frequency crystal input. It is designed to replace crystals and crystal oscillators in most electronic systems.

Using ICS' VersaClock™ software to configure PLLs and outputs, the ICS276 contains a One-Time Programmable (OTP) ROM for field programmability. Programming features include VCXO and eight selectable configuration registers. Each of the outputs are powered by a single VDDO voltage. VDDO may vary from 1.8V to VDD.

Using Phase-Locked Loop (PLL) techniques, the device runs from a standard fundamental mode, inexpensive crystal, or clock. It can replace VCXOs, multiple crystals and oscillators, saving board space and cost.

The ICS276 is also available in factory programmed custom versions for high-volume applications.

 

Features Packaged as 16 pin TSSOP Eight addressable registers Replaces multiple crystals and oscillators Output frequencies up to 200MHz at 3.3V Input crystal frequency of 5 to 27MHz Up to three reference outputs Operating voltages of 3.3V VDDO output control from 1.8V to 3.3V Controllable output drive levels Advanced, low-power CMOS process Available in Pb (lead) free packaging

 

 

ICS280
The ICS280 field programmable spread spectrum clock synthesizer generates up to four high-quality, high-frequency clock outputs including multiple reference clocks from a low frequency crystal input. It is designed to replace crystals, crystal oscillators and stand alone spread spectrum devices in most electronic systems. Using ICS' VersaClock™ software to configure PLLs and outputs, the ICS280 contains a One-Time Programmable (OTP) ROM for field programmability. Programming features include input/output frequencies, spread spectrum amount and eight selectable configuration registers. Using Phase-Locked Loop (PLL) techniques, the device runs from a standard fundamental mode, inexpensive crystal, or clock. It can replace multiple crystals and oscillators, saving board space and cost. The ICS280 is also available in factory programmed custom versions for high-volume applications.

 

Features Packaged as 16 pin TSSOP Eight addressable registers Replaces multiple crystals and oscillators Output frequencies up to 200MHz at 3.3V Configurable Spread Spectrum Modulation Input crystal frequency of 5 to 27MHz Input clock frequency of 3 to 166MHz Up to four reference outputs Operating voltages of 3.3V Controllable output drive levels Advanced, low-power CMOS process Available in Pb (lead) free packaging

 

 

ICS281
The ICS281 field programmable spread spectrum clock synthesizer generates up to three high-quality, high-frequency clock outputs including multiple reference clocks from a low-frequency crystal input. It is designed to replace crystals, crystal oscillators and stand alone spread spectrum devices in most electronic systems. Using ICS' VersaClock™ software to configure PLLs and outputs, the ICS281 contains a One-Time Programmable (OTP) ROM for field programmability. Programming features include input/output frequencies, spread spectrum amount and eight selectable configuration registers. Using Phase-Locked Loop (PLL) techniques, the device runs from a standard fundamental mode, inexpensive crystal, or clock. It can replace multiple crystals and oscillators, saving board space and cost. The ICS281 is also available in factory programmed custom versions for high-volume applications.

 

Features Packaged as 16 pin TSSOP Eight addressable registers Replaces multiple crystals and oscillators Output frequencies up to 200MHz at 3.3V Configurable Spread Spectrum Modulation Input crystal frequency of 5 to 27MHz Input clock frequency of 3 to 166MHz Up to three reference outputs Operating voltages of 3.3 V VDDO output control from 1.8V to 3.3V Controllable output drive levels Advanced, low-power CMOS process Available in Pb (lead) free packaging

 

 

ICS290
The ICS290 field programmable spread spectrum clock synthesizer generates up to eight high-quality, high-frequency clock outputs including multiple reference clocks from a low-frequency crystal input. It is designed to replace crystals, crystal oscillators and stand alone spread spectrum devices in most electronic systems. Using ICS' VersaClock™ software to configure PLLs and outputs, the ICS290 contains a One-Time Programmable (OTP) ROM for field programmability. Programming features include input/output frequencies, spread spectrum amount, eight selectable configuration registers and up to two sets of four low-skew outputs. Using Phase-Locked Loop (PLL) techniques, the device runs from a standard fundamental mode, inexpensive crystal, or clock. It can replace multiple crystals and oscillators, saving board space and cost. The ICS290 is also available in factory programmed custom.

 

Features Packaged as 20 pin TSSOP Eight addressable registers Replaces multiple crystals and oscillators Output frequencies up to 200MHz at 3.3V Configurable Spread Spectrum Modulation Input crystal frequency of 5 to 27MHz Clock input frequency of 3 to 166MHz Up to eight reference outputs Up to two sets of four low-skew outputs Operating voltages of 3.3V Controllable output drive levels Advanced, low-power CMOS process Available in Pb (lead) free packaging

 

 

ICS291
The ICS291 field programmable spread spectrum clock synthesizer generates up to six high-quality, high-frequency clock outputs including multiple reference clocks from a low-frequency crystal input. It is designed to replace crystals, crystal oscillators and stand alone spread spectrum devices in most electronic systems.

Using IDT's VersaClock™ software to configure PLLs and outputs, the ICS291 contains a One-Time Programmable (OTP) ROM for field programmability. Programming features include input/output frequencies, spread spectrum amount, eight selectable configuration registers and up to two sets of three low-skew outputs.

Each of the two output groups are powered by a separate VDDO voltage. VDDO may vary from 1.8V to VDD.

Using Phase-Locked Loop (PLL) techniques, the device runs from a standard fundamental mode, inexpensive crystal, or clock. It can replace multiple crystals and oscillators, saving board space and cost.

The ICS291 is also available in factory programmed custom versions for high-volume applications.

 

Features Packaged as 20 pin TSSOP Eight addressable registers Replaces multiple crystals and oscillators Output frequencies up to 200MHz at 3.3V Configurable Spread Spectrum Modulation Input crystal frequency of 5 to 27MHz Clock input frequency of 3 to 166MHz Up to six reference outputs Separate 1.8 to 3.3V VDDO output level controls for each bank of 3 outputs Up to two sets of three low-skew outputs Operating voltages of 3.3V Controllable output drive levels Advanced, low-power CMOS process Available in Pb (lead) free packaging

 

 

 Featured Products

Part Number		Description	Data Sheet	App. Notes
251PMLF		Single-output, Field Programmable Clock Synthesizer
252PMLF		Dual-output, Field Programmable Clock Synthesizer
270PGLF		Field Programmable VCXO Clock Synthesizer
271PGLF		Field Programmable VCXO Clock Synthesizer
275PGLF		Field Programmable VCXO Clock Synthesizer
276PGLF		Field Programmable VCXO Clock Synthesizer
280PGLF		Field Programmable Spread Spectrum Clock Synthesizer
281PGLF		Triple PLL Field Programmable Spread Spectrum Clock Synthesizer
290PGLF		Field Programmable Spread Spectrum Clock Synthesizer
291PGLF		Field Programmable Spread Spectrum Clock Synthesizer

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