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M93C46-A125 データシート(PDF) 8 Page - STMicroelectronics |
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M93C46-A125 データシート(HTML) 8 Page - STMicroelectronics |
8 / 31 page Connecting to the serial bus M93Cx6-A125 8/31 DocID024752 Rev 5 2 Connecting to the serial bus Figure 3 shows an example of three memory devices connected to an MCU, on a serial bus. Only one device is selected at a time, so only one device drives the Serial Data output (Q) line at a time, the other devices are high impedance. The pull-down resistor R (represented in Figure 3) ensures that no device is selected if the bus master leaves the S line in the high impedance state. In applications where the bus master may be in a state where all inputs/outputs are high impedance at the same time (for example, if the bus master is reset during the transmission of an instruction), the clock line (C) must be connected to an external pull-down resistor so that, if all inputs/outputs become high impedance, the C line is pulled low (while the S line is pulled low): this ensures that C does not become high at the same time as S goes low, and so, that the tSLCH requirement is met. The typical value of R is 100 kΩ. Figure 3. Bus master and memory devices on the serial bus |
同様の部品番号 - M93C46-A125 |
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同様の説明 - M93C46-A125 |
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