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CY62256NLL-55SNXI Datasheet(PDF) 7 Page - Cypress Semiconductor |
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CY62256NLL-55SNXI Datasheet(HTML) 7 Page - Cypress Semiconductor |
7 / 14 page CY62256N Document Number: 001-06511 Rev. *D Page 7 of 14 Figure 6. Read Cycle No. 2[17, 18] Figure 7. Write Cycle No. 1 (WE Controlled)[19, 20, 21] Figure 8. Write Cycle No. 2 (CE Controlled)[19, 20, 21] Notes 17. WE is HIGH for Read cycle. 18. Address valid prior to or coincident with CE transition LOW. 19. The internal Write time of the memory is defined by the overlap of CE LOW and WE LOW. Both signals must be LOW to initiate a Write and either signal can terminate a Write by going HIGH. The data input setup and hold timing should be referenced to the rising edge of the signal that terminates the Write. 20. Data I/O is high impedance if OE = VIH. 21. If CE goes HIGH simultaneously with WE HIGH, the output remains in a high-impedance state. 22. During this period, the I/Os are in output state and input signals should not be applied. Switching Waveforms (continued) 50% 50% DATA VALID tRC tACE tDOE tLZOE tLZCE tPU DATA OUT HIGH IMPEDANCE IMPEDANCE ICC ISB tHZOE tHZCE tPD OE CE HIGH VCC SUPPLY CURRENT tHD tSD tPWE tSA tHA tAW tWC DATA I/O ADDRESS CE WE OE tHZOE DATAIN VALID NOTE 22 tWC tAW tSA tHA tHD tSD tSCE WE DATA I/O ADDRESS CE DATAIN VALID [+] Feedback |
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