• Supply current estimates for party number CY7B992-7JI

    Using part number CY7B992-7JI in an application with datasheet environment variables of F=80, C=50 and N=8, occasionally supply current values are observed in excess of the estimated 272mA max . As such, is 300mA a re...
    JoHo_4506076
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  • Cypress Clock Generaotor Product: Input differential signal (161.13Mhz),Output single-end signal (25Mhz)

    We find Cypress Clock Generaotor.Input differential signal (161.13Mhz),Output single-end signal (25Mhz), Please help provide Cypress products (Part number) for package SOP8/SOP16 ?   Because instead of  I...
    user_4163646
    last modified by user_4163646
  • Partner Device Clock Selection - Which parts are recommended for various FPGAs such as Intel Stratix 10 @ 200MHz to achieve < 1.1ps jitter

    Does Cypress have a matrix matching products to partner devices?   Many products are designed for a specific application - showing that application, or at least the clock distribution portion, will help others c...
    GrCa_1363456
    last modified by GrCa_1363456
  • Perfect Timing II Book shaped to Perfection!

    Find the clock basics covered in this book in various chapters. I find this to be equivalent to what one can call as Cypress’s Bible to Clocks and Buffers! Post your questions here! The authors themselves might ...
  • High Performance Buffers In Production Now

    Check out the different devices in the new High Performance Buffer (HPB) family with ultra low-jitter non-PLL clock fanout buffers that delivers up to 10 high-frequency (up to 1.5GHz) differential outputs (LVPECL...
  • Spread Spectrum Signals Require Spread Aware Clock Buffers for Distribution

    Always look and go for Spread Aware Clock Buffers for signal distribution when you want Spread Spectrum signal to pass as they have larger close loop bandwidth. Normal Clock Buffers will filter the spread spectrum sig...
  • Points to Remember While Comparing Cycle to Cycle Jitter Between Different Manufacturers

    When you want fair comparisons made while looking at the cycle to cycle jitter numbers, there are few points to remember as follows:                 &...
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  • Ferrite Bead Go/No-Go for Filtering Clock Buffer Power Supplies

    Ferrite beads are used in power supply filtering as they reduce the injection of clock noise into the main VDD supply. At the same time they also increase ripple in Cypress clock devices. It would also filter the nece...
  • Adjustment Phase Granularity of RoboClocks

    Time Unit (tU) is adjustment phase granularity. In RoboClock family, the CY7B993V and CY7B994V have it ranging from 0.625ns to 1.25ns. The CY7B991 and CY7B992 have it ranging from 0.7ns to 1.5ns. The selectable skew i...
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  • Jitter Transfer Characteristics of Cypress Clock Buffers

    The jitter transfer characteristic is that of second order low-pass filter with the -3dB point at approximately 1MHz-3MHz depending on its internal configuration (also called close loop bandwidth). This means that if ...
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  • Tracking Skew of PLLs

    Tracking skew can be defined as the deviation of the output of the PLL from its input. We can expect the feedback signal to be stable as any variations there itself can cause instability with the locking and have t...
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  • Output Impedance and Termination of Zero Delay Buffers

    The output impedance of Cypress Zero Delay Buffers is between 20-30 ohm, unless otherwise specified in the datasheets. So its recommended to use a 20-30 ohm series resistor to match a 50 ohm transmission line. Since t...
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  • Regarding AVCMOS outputs!

    AVCMOS name/design came in from one of the companies Cypress acquired, IMI. It is another name for variable output impedance (VOI), or sometimes called variable slew rate (VSR). It is a type of output buffer that has ...
  • ZDB or NZDB – How to decide which one to go for?

    Making a choice to go for ZDB (Zero Delay Buffer) or NZDB (Non-Zero Delay Buffer) is fairly dependent on your application requirements.     With ZDB, we have a PLL inside that gives zero delay between ...
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  • General Tips to Minimize Output to Output Skew of Clock Buffers

    Tips to minimize output-output skew are as follows: 1. Keep same length transmission lines at output. 2. Allow only one frequency output simultaneously. 3. Use same Vdd on all output buffers. 4. Termin...
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  • Power Supply Decoupling and Layout Significance in Buffers

    Even if there is no ripple at the supply source, you will see ripple at the Vdd pin of a Buffer when its outputs are switching. The switching outputs create large di/dt which causes Vdd and Vss noise both inside the c...
  • Clock Buffer Behavior below the Specified Minimum Input Frequency

    Currently Cypress does not have much buffer devices in the lower MHz range or KHz range. There is CY2302 amongst zero delay buffers that can go down to 5MHz.          ...
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  • Tracking Skew of Zero Delay Buffers: Tested on CY2308

    Usually the CY2308 is not designed as a Fail Safe device. However, the PLL of the 2308 will not lose lock as a consequence of the oscillator being pulled by a few hundred PPM. The 2308 PLL will be able to track any lo...
  • Lower Temperature Effect beyond Temperature Grade on Buffers

    At lower temperature, transistors become faster, so edge rates would become faster.                 Generally, we would expect the following parameters gett...
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  • Already Weak Pull Downs Available on Cypress Clock Buffer Outputs!

    There are weak pull-down for REF input and all outputs of Cypress clock buffers that can be checked in respective datasheets. One do not need to provide pull-downs, but if really needed, 5K or 10K can be fine. The low...
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