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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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MPC8309EC bảng dữ liệu(PDF) 38 Page - Freescale Semiconductor, Inc |
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MPC8309EC bảng dữ liệu(HTML) 38 Page - Freescale Semiconductor, Inc |
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38 / 82 page  MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 0 38 Freescale Semiconductor USB Figure 28 and Figure 29 provide the AC test load and signals for the USB, respectively. Figure 28. USB AC Test Load Figure 29. USB Signals Table 36. USB General Timing Parameters Parameter Symbol1 Min Max Unit Notes USB clock cycle time tUSCK 15 — ns Input setup to USB clock—all inputs tUSIVKH 4— ns input hold to USB clock—all inputs tUSIXKH 1— ns USB clock to output valid—all outputs (except USBDR_STP_USBDR_STP) tUSKHOV —7 ns USB clock to output valid—USBDR_STP tUSKHOV —7.5 ns Output hold from USB clock—all outputs tUSKHOX 2— ns Note: 1. The symbols used for timing specifications follow the pattern of t(first two letters of functional block)(signal)(state)(reference)(state) for inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tUSIXKH symbolizes USB timing (USB) for the input (I) to go invalid (X) with respect to the time the USB clock reference (K) goes high (H). Also, tUSKHOX symbolizes us timing (USB) for the USB clock reference (K) to go high (H), with respect to the output (O) going invalid (X) or output hold time. Output Z0 = 50 OVDD/2 RL = 50 Output Signals tUSKHOV USBDR_CLK Input Signals tUSIXKH tUSIVKH tUSKHOX |
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