Cypress Semiconductor CY2291 manual

1
2
3
4
5
6
7
8
9
10
11
12

Go to page of

A good user manual

The rules should oblige the seller to give the purchaser an operating instrucion of Cypress Semiconductor CY2291, along with an item. The lack of an instruction or false information given to customer shall constitute grounds to apply for a complaint because of nonconformity of goods with the contract. In accordance with the law, a customer can receive an instruction in non-paper form; lately graphic and electronic forms of the manuals, as well as instructional videos have been majorly used. A necessary precondition for this is the unmistakable, legible character of an instruction.

What is an instruction?

The term originates from the Latin word „instructio”, which means organizing. Therefore, in an instruction of Cypress Semiconductor CY2291 one could find a process description. An instruction's purpose is to teach, to ease the start-up and an item's use or performance of certain activities. An instruction is a compilation of information about an item/a service, it is a clue.

Unfortunately, only a few customers devote their time to read an instruction of Cypress Semiconductor CY2291. A good user manual introduces us to a number of additional functionalities of the purchased item, and also helps us to avoid the formation of most of the defects.

What should a perfect user manual contain?

First and foremost, an user manual of Cypress Semiconductor CY2291 should contain:
- informations concerning technical data of Cypress Semiconductor CY2291
- name of the manufacturer and a year of construction of the Cypress Semiconductor CY2291 item
- rules of operation, control and maintenance of the Cypress Semiconductor CY2291 item
- safety signs and mark certificates which confirm compatibility with appropriate standards

Why don't we read the manuals?

Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of Cypress Semiconductor CY2291 alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of Cypress Semiconductor CY2291, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the Cypress Semiconductor service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of Cypress Semiconductor CY2291.

Why one should read the manuals?

It is mostly in the manuals where we will find the details concerning construction and possibility of the Cypress Semiconductor CY2291 item, and its use of respective accessory, as well as information concerning all the functions and facilities.

After a successful purchase of an item one should find a moment and get to know with every part of an instruction. Currently the manuals are carefully prearranged and translated, so they could be fully understood by its users. The manuals will serve as an informational aid.

Table of contents for the manual

  • Page 1

    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 . *C Revised September 16, 2008 Features ■ Three integrated phase-lo cked loops ■ EPROM programmability ■ Factory-programmable (CY2291) or field-pr[...]

  • Page 2

    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. VDD 4, 16 V oltage supply . GND 5 Ground. XT ALIN [1] 6 Reference crystal input [...]

  • Page 3

    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 ICD2028 and continu es their tradition by providing a high level o f customizable features to meet the diverse clock generation needs of modern motherbo [...]

  • Page 4

    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 + 7.0V DC Input V oltage ...... ........... ... ... .. .............. ....–0.5V to + 7.0V S torag[...]

  • Page 5

    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 32.768-kHz HIGH-Level Output V oltage I OH = 0.5 mA V BA TT 0.5 V V OL–32 32.768-kHz[...]

  • Page 6

    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 = +0.5V < 1 10 μ A I OZ Output Leakage Current Three-state outputs 250 μ A I DD V[...]

  • Page 7

    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. Ty p . Max. Unit t 1 Output Period Clock output range, 3.3V operation CY2291 12.5 [...]

  • Page 8

    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 12.5 (80 MHz) 1 3000 (76.923 kHz) ns Output Duty Cycle [1 1] Duty cycle for output s, defined as t 2 [...]

  • Page 9

    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 1.0 20.0 MHz/ms t 9A Clock Jitter [14] Peak-to-peak period [...]

  • Page 10

    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 3.3V or 5.0V Pb-Free CY2291SXC–XXX 20-Pin[...]

  • Page 11

    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[...]

  • Page 12

    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. CY2291 © Cypress Semicondu ctor Corpor ation, 20[...]