Instruction/ maintenance manual of the product CY2291 Cypress
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CY2291 Three-PLL General Purpose EPROM Programmable Clock Generator Cypress Semiconductor Corpora tion • 198 Champion Court • San Jose , CA 95134-1709 • 408-943-2600 Document #: 38-07189 Rev .
CY2291 Document #: 38-07189 Rev . *C Page 2 of 12 Pinout s Figure 1. CY2291- 20-pin SOIC Pin Definitions Name Pin Number Description 32XOUT 1 32.768-kHz crystal feedback. 32K 2 32.768-kHz output (always active if VBA TT is present). CLKC 3 Configurable clo ck output C.
CY2291 Document #: 38-07189 Rev . *C Page 3 of 12 Operation The CY2291 is a third-ge neration family of cl ock generators. The CY2291 is upwardl y compatible with the industry standard ICD2023 and ICD.
CY2291 Document #: 38-07189 Rev . *C Page 4 of 12 Maximum Ratings (Exceeding maximum ratings may shorten the useful life of the device. User gui d el i ne s are not tested.) Supply V oltage ............... .............. .............. ....–0.5V to + 7.
CY2291 Document #: 38-07189 Rev . *C Page 5 of 12 Electrical Characteristics, Commercial 3.3V Parameter Description Conditions Min. Ty p . Max. Unit V OH HIGH-Level Output V oltage I OH = 4.0 mA 2.4 V V OL LOW -Level O utput V oltage I OL = 4.0 mA 0.4 V V OH–32 32.
CY2291 Document #: 38-07189 Rev . *C Page 6 of 12 V IH HIGH-Level Input V oltage [9] Except crystal pins 2.0 V V IL LOW -Level I nput V oltage [9] Except cryst al pins 0.8 V I IH Input HIGH Current V IN = V DD –0 .5V < 1 10 μ A I IL Input LOW C ur rent V IN = +0.
CY2291 Document #: 38-07189 Rev . *C Page 7 of 12 t 10B Lock T ime for UPLL and SPLL Lock T ime from Power Up < 0.25 1 ms Slew Limits CPU PLL Slew Limits CY2291 8 100 MHz CY2291F 8 90 MHz Switching Characteristics, Commercial 3.3 V Parameter Name Description Mi n.
CY2291 Document #: 38-07189 Rev . *C Page 8 of 12 Switching Characteristics, Industrial 5.0V Parameter Name Description Mi n. Ty p . Max. Unit t 1 Output Period Clock output range, 5V operation CY2291I 1 1.1 (90 MHz) 1 3000 (76.923 kHz) ns CY2291FI 12.
CY2291 Document #: 38-07189 Rev . *C Page 9 of 12 t 6 Output Enable Ti m e Time for output to leave three-st ate mode after SHUTDOWN /OE goes HIGH 10 1 5 ns t 7 Skew Skew delay between any identical or related outputs [3, 12, 15] < 0 .25 0. 5 ns t 8 CPUCLK Slew Frequency transition rate 1.
CY2291 Document #: 38-07189 Rev . *C Page 10 of 12 Switching W aveforms SELECT CPU OLD SELECT NEW SELECT STABLE F old F new t 8 &t 10 Figure 5. CPU Frequency Chang e T est Circuit Ordering Information Ordering Code Package T ype Operating Rang e Operatin g V oltage CY2291FI [16] 20-Pin SOIC Industrial 3.
CY2291 Document #: 38-07189 Rev . *C Page 1 1 of 12 Package Diagram Figure 6. 20-Pin (300 MI L) SOIC Package Outline 51-85024 *C [+] Feedback.
Document #: 38-07189 Rev . *C Revise d September 16, 2008 Page 12 of 12 Pentium is a registered trademark o f Inte l Corporation. CyClocks is a trademark o f Cy press Semiconductor Co rporation. All produ ct and comp any names me ntioned in this document are trad emarks of their respecti ve holders.
An important point after buying a device Cypress CY2291 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Cypress CY2291 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Cypress CY2291 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Cypress CY2291 you will learn all the available features of the product, as well as information on its operation. The information that you get Cypress CY2291 will certainly help you make a decision on the purchase.
If you already are a holder of Cypress CY2291, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Cypress CY2291.
However, one of the most important roles played by the user manual is to help in solving problems with Cypress CY2291. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Cypress CY2291 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
