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UT7C138C55WPX Datasheet(PDF) 11 Page - Aeroflex Circuit Technology |
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UT7C138C55WPX Datasheet(HTML) 11 Page - Aeroflex Circuit Technology |
11 / 21 page 11 Address CE R/ W Data in tWC tSCE t AW tPWE tSA t SD DATA VALID t HA t LZWE tHD tHZWE HIGH IMPEDANCE Figure 4b. Write Cycle 2: R/W Three-States Data I/Os (Either Port) Assumptions: 1. The internal write time of memory is defined by the overlap of CE LOW and R/ W LOW. Both signals must be LOW to initialize a write, and either signal can terminate a write by going HIGH. The data input set-up and hold timing should be referenced to the rising edge of the sig- nal that terminates the write. 2. R/W must be HIGH during all address transactions. 3. Data I/O pins enter high impedance even if OE is held LOW during write. Data out tWHWL |
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