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CAT28C257PI-12T 데이터시트(PDF) 6 Page - Catalyst Semiconductor |
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CAT28C257PI-12T 데이터시트(HTML) 6 Page - Catalyst Semiconductor |
6 / 12 page CAT28C257 6 Doc. No. 1015, Rev. D ADDRESS 28C256 F06 CE OE WE tRC DATA OUT DATA VALID DATA VALID tCE tOE tOH tAA tOHZ tHZ VIH HIGH-Z tLZ tOLZ DEVICE OPERATION Read Data stored in the CAT28C257 is transferred to the data bus when WE is held high, and both OE and CE are held low. The data bus is set to a high impedance state when either CE or OE goes high. This 2-line control architecture can be used to eliminate bus contention in a system environment. 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 5 ms. Figure 3. Read Cycle Figure 4. Byte Write Cycle [WE Controlled] ADDRESS CE OE WE DATA OUT tAS DATA IN DATA VALID HIGH-Z tCS tAH tCH tWC tOEH tBLC tDH tDS tOES tWP |
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