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X24325PI Datasheet(PDF) 3 Page - Xicor Inc. |
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X24325PI Datasheet(HTML) 3 Page - Xicor Inc. |
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3 / 17 page  X24325 3 DEVICE OPERATION The X24325 supports a bidirectional bus oriented pro- tocol. The protocol defines any device that sends data onto the bus as a transmitter, and the receiving device as the receiver. The device controlling the transfer is a master and the device being controlled is the slave. The master will always initiate data transfers, and pro- vide the clock for both transmit and receive operations. Therefore, the X24325 will be considered a slave in all applications. Clock and Data Conventions Data states on the SDA line can change only during SCL LOW. SDA state changes during SCL HIGH are reserved for indicating start and stop conditions. Refer to Figures 1 and 2. Start Condition All commands are preceded by the start condition, which is a HIGH to LOW transition of SDA when SCL is HIGH. The X24325 continuously monitors the SDA and SCL lines for the start condition and will not respond to any command until this condition has been met. SCL SDA DATA STABLE DATA CHANGE 6552 ILL F04 SCL SDA START BIT STOP BIT 6552 ILL F05 Figure 1. Data Validity Figure 2. Definition of Start and Stop Notes: (5) Typical values are for TA = 25°C and nominal supply voltage (5V) (6) tWR is the minimum cycle time from the system perspective when polling techniques are not used. It is the maximum time the device requires to perform the internal write operation. |
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