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USB5744 数据表(PDF) 38 Page - Microchip Technology |
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USB5744 数据表(HTML) 38 Page - Microchip Technology |
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38 / 51 page  USB5744 DS00001855L-page 38 2022 Microchip Technology Inc. and its subsidiaries 10.6.7 SPI TIMING This section specifies the SPI timing requirements for the device. FIGURE 10-5: SPI TIMING TABLE 10-8: SPI TIMING (30 MHZ OPERATION) Symbol Description Min Typ Max Units tfc Clock frequency 30 MHz tceh Chip enable (SPI_CE_EN) high time 100 ns tclq Clock to input data 13 ns tdh Input data hold time 0 ns tos Output setup time 5 ns toh Output hold time 5 ns tov Clock to output valid 4 ns tcel Chip enable (SPI_CE_EN) low to first clock 12 ns tceh Last clock to chip enable (SPI_CE_EN) high 12 ns TABLE 10-9: SPI TIMING (60 MHZ OPERATION) Symbol Description Min Typ Max Units tfc Clock frequency 60 MHz tceh Chip enable (SPI_CE_EN) high time 50 ns tclq Clock to input data 9 ns tdh Input data hold time 0 ns tos Output setup time 5 ns toh Output hold time 5 ns tov Clock to output valid 4 ns tcel Chip enable (SPI_CE_EN) low to first clock 12 ns tceh Last clock to chip enable (SPI_CE_EN) high 12 ns SPI_CLK SPI_DI SPI_DO SPI_CE_N tcel tfc tclq tceh tdh toh tos tov toh |
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