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CY2XF33FLXIT Datasheet(PDF) 3 Page - Cypress Semiconductor |
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CY2XF33FLXIT Datasheet(HTML) 3 Page - Cypress Semiconductor |
3 / 12 page CY2XF33 Document Number: 001-53148 Rev. *E Page 3 of 12 Functional Description The FS0 and FS1 pins select between four different output frequencies, as shown in Table 3. Frequency margining is a common application for this feature. One frequency is used for the standard operating mode of the device, while the other frequencies are available for margin testing, either during product development or in system manufacturing test. When changing the output frequency, the frequency transition is not guaranteed to be smooth. There can be frequency excursions beyond the start frequency and the new frequency. Glitches and runt pulses are possible, and time must be allowed for the PLL to relock. Programming Description The CY2XF33 is a programmable device. Before being used in an application, it must be programmed with the output frequencies and other variables described in a later section. Two different device types are available, each with its own programming flow. They are described in the following sections.5 Field Programmable CY2XF33F Field programmable devices are shipped unprogrammed and must be programmed before being installed on a printed circuit board (PCB). Customers use CyberClocks™ Online Software to specify the device configuration and generate a JEDEC (extension .jed) programming file. Programming of samples and prototype quantities is available using a Cypress programmer. Third party vendors manufacture programmers for small to large volume applications. Cypress’s value added distribution partners also provide programming services. Field programmable devices are designated with an “F” in the part number. They are intended for quick prototyping and inventory reduction. The CY2XF33 is one time programmable (OTP). The software is located at CyberClocks(TM) Online Software. Factory Configured CY2XF33 For customers wanting ready-to-use devices, the CY2XF33 is available with no field programming required. All requests are submitted to the local Cypress Field Application Engineer (FAE) or sales representative. After the request is processed, the user receives a new part number, samples, and data sheet with the programmed values. This part number is used for additional sample requests and production orders. Table 2. Frequency Select FS1 FS0 Output Frequency 0 0 Frequency 0 0 1 Frequency 1 1 0 Frequency 2 1 1 Frequency 3 |
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