Manuale d’uso / di manutenzione del prodotto CY7C145 del fabbricante Cypress
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CY7C145, CY7C144 8K x 8/9 Dual-Port S t atic RAM with SEM, INT , BUSY Cypress Semiconductor Corpora tion • 198 Champion Court • San Jose , CA 95134-1709 • 408-943-2600 Document #: 38-06034 Rev .
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 2 of 21 Pin Configurations Figure 1. 68-Pin PLCC (T op View) Figure 2. 64-Pin PLCC (T op View) 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 67 60 59.
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 3 of 21 Figure 3. 80- Pin TQFP Pin Configurations (continued) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 17 16 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32.
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 4 of 21 Maximum Ratin gs Exceeding maximum ratings may impair the useful life of the device. These user guid elines are not tested. [5] S torage T emperature ........ ......... ........... ......... − 65 ° C to +150 ° C Ambient T emperature with Power Applied .
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 5 of 21 Electrical Characteristics Over the Operating Range (continued) Parameter Description T est Conditions 7C144-35 7C145-35 7C144-55 7C145-55 Unit Min Max Min Max V OH Output HIGH V oltage V CC = Min.
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 6 of 21 Figure 4. AC T est Loads and Waveforms 3.0V GND 90% 90% 10% ≤ 3n s ≤ 3 ns 10% ALL INPUT PULSES (a) Normal Load (Load 1) 5V OUTPUT C= 3 0 pF V TH = 1.
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 7 of 21 t SD Data Set-Up to Write End 10 15 15 25 ns t HD Data Hold From Write End 0 0 0 0 ns t HZWE [1 1,12] R/W LOW to High Z 10 15 2 0 25 n s t L.
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 8 of 21 Switching W aveforms Figure 5. Read Cycle No. 1 (Either Por t Address Access) [15, 16] Figure 6. Read Cycle No. 2 (Either Port CE /OE Access) [15, 17, 18] Figure 7. Re ad Ti ming with Port- to-Port Delay (M/S =L ) [19, 20] Notes 15.
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 9 of 21 Figure 8. Write Cycle No. 1: OE Three-S tate Dat a I/Os (Either Port) [21, 22, 23] Figure 9. Write Cycle No. 2: R/W Three-S t ate Data I/Os (Either Port) [21, 23, 24 ] Notes 21. The internal write time of the memory is def ined by the overlap of CE or SEM LOW and R/W LOW .
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 10 of 21 Figure 10. Semaphore Read After Write T iming, Either Side [25] Figure 1 1. Semaphore Conte ntion [26, 27, 28] Notes 25. CE = HIG H for the duration of the abov e timing (both writ e and read cycle).
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 1 1 of 21 Figure 12. Read with BUSY (M/S=HIGH) [20] Figure 13. Write Ti ming with Busy Input (M/S =LOW) Switching W aveforms (continued ) VALID t DD.
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 12 of 21 Figure 14. Busy Timing Diagram No. 1 (CE Arbitration) [29] Figure 15. Busy Timing Diagram No.
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 13 of 21 Figure 16. Interrupt Timing Diagrams Notes 30. t HA depends on which enable pin (CE L or R/W L ) is deasserted first. 31. t INS or t INR depends on which enable p in (CE L or R/W L ) is asserted last.
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 14 of 21 Architecture The CY7C1 44/5 consi sts of a an arra y of 8K words of 8/9 bi ts each of dual-port RAM cells, I/O and a ddress lines, and control signals (CE , OE , R/W ). These control pins pe rmit independent access for re ads or writes to any location in memory .
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 15 of 21 T able 3. Non-Cont ending Read /Write Input s Outputs CE R/W OE SEM I/O 0 − 7/8 Operation H X X H High Z Power-Down H H L L Data Out Read.
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 16 of 21 Figure 17. T ypical DC and AC Chara cteristics 1.4 1.0 0.4 4.0 4.5 5.0 5. 5 6.0 − 55 25 125 1.2 1.0 120 80 0 1.0 2.0 3.0 4.0 OUTPUT SOURCE CURR ENT (mA) SUPPLY VOLTAGE (V) NORMALIZED SUPPLY CURRENT vs.
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 17 of 21 Ordering Information 8K x8 Dual-Port SRAM Speed (ns) Ordering C ode Package Name Package T ype Operating Range 15 CY7C144-15 AC A65 64-Pin .
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 18 of 21 8K x9 Dual-Port SRAM Speed (ns) Ordering Code Package Name Package T ype Operating Range 15 CY7C145-15AC A80 80-Pin Thin Quad F lat Pack Co.
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 19 of 21 Package Diagrams Figure 18. 64-Pin Th in Plastic Quad Fl at Pack (14 x 14 x 1.4 mm ) A65 (5 1-85046) 51-85046-* C [+] Feedback.
CY7C145, CY7C144 Document #: 38-06034 Rev . *D Page 20 of 21 Figure 19. 80-Pin Thi n Plasti c Quad Flat Pack A80 (51-850 65) Figure 20. 68-Pin Plastic Lead ed Chip Carrier J81 (51-8 5005) 51-85065-* B.
Document #: 38-06034 Rev . *D Revised December 10, 2008 Page 21 of 21 All product s and company names ment ioned in thi s document may be the tra demarks of thei r respective h olders. CY7C145, CY7C144 © Cypress Semicondu ctor Corporati on, 2005-2008.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Cypress CY7C145 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Cypress CY7C145 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Cypress CY7C145 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Cypress CY7C145 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Cypress CY7C145, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Cypress CY7C145.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Cypress CY7C145. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Cypress CY7C145 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
