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CAT28C257T13-90T Datenblatt(PDF) 7 Page - Catalyst Semiconductor |
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CAT28C257T13-90T Datenblatt(HTML) 7 Page - Catalyst Semiconductor |
7 / 10 page Advanced CAT28C257 7 Doc. No. 25073-00 2/98 Page Write The page write mode of the CAT28C257 (essentially an extended BYTE WRITE mode) allows from 1 to 128 bytes of data to be programmed within a single E2PROM write cycle. This effectively reduces the byte-write time by a factor of 128. Following an initial WRITE operation ( WE pulsed low, for tWP, and then high) the page write mode can begin by issuing sequential WE pulses, which load the address and data bytes into a128 byte temporary buffer. The page address where data is to be written, specified by bits A7 to A14, is latched on the last falling edge of WE. Each byte within the page is defined by address bits A0 to A6 (which can be loaded in any order) during the first and subsequent write cycles. Each successive byte load cycle must begin within tBLC MAX of the falling edge of the preceding WE pulse. There is no page write window limitation as long as WE is pulsed low within tBLC MAX. Upon completion of the page write sequence, WE must stay high a minimum of tBLC MAX for the internal auto- matic program cycle to commence. This programming cycle consists of an erase cycle, which erases any data that existed in each addressed cell, and a write cycle, which writes new data back into the cell. A page write will only write data to the locations that were addressed and will not rewrite the entire page. Figure 5. Byte Write Cycle [ CE CE CE CE CE Controlled] 5096 FHD F07 Figure 6. Page Mode Write Cycle OE CE WE ADDRESS I/O tWP tBLC BYTE 0 BYTE 1 BYTE 2 BYTE n BYTE n+1 BYTE n+2 LAST BYTE tWC 5096 FHD F10 ADDRESS CE OE WE DATA OUT tAS DATA IN DATA VALID HIGH-Z tAH tWC tOEH tDH tDS tOES tBLC tCH tCS tCW |
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Ähnliche Beschreibung - CAT28C257T13-90T |
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