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CAT28C17AXI-20T 데이터시트(PDF) 7 Page - ON Semiconductor |
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CAT28C17AXI-20T 데이터시트(HTML) 7 Page - ON Semiconductor |
7 / 12 page CAT28C17A http://onsemi.com 7 Byte Write A write cycle is executed when both CE and WE are low, and OE is high. Write cycles can be initiated using either WE or CE, with the address input being latched on the falling edge of WE or CE, whichever occurs last. Data, conversely, is latched on the rising edge of WE or CE, whichever occurs first. Once initiated, a byte write cycle automatically erases the addressed byte and the new data is written within 10 ms. DATA Polling DATA polling is provided to indicate the completion of a byte write cycle. Once a byte write cycle is initiated, attempting to read the last byte written will output the complement of that data on I/O7 (I/O0–I/O6 are indeterminate) until the programming cycle is complete. Upon completion of the self−timed byte write cycle, all I/O’s will output true data during a read cycle. Figure 6. Byte Write Cycle [CE Controlled] ADDRESS DATA VALID HIGH−Z CE OE WE DATA OUT DATA IN RDY/BUSY tAS tAH tCW tCS tOES tDS tDH tDB tCH tOEH tDL tWC |
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