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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8306SEC датащи(PDF) 30 Page - Freescale Semiconductor, Inc |
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MPC8306SEC датащи(HTML) 30 Page - Freescale Semiconductor, Inc |
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30 / 70 page  MPC8306S PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 1 30 Freescale Semiconductor HDLC The following figure provides the AC test load. Figure 20. AC Test Load Figure 21 and Figure 22 represent the AC timing from Table 29. Note that although the specifications generally reference the rising edge of the clock, these AC timing diagrams also apply when the falling edge is the active edge. The following figure shows the timing with external clock. Figure 21. AC Timing (External Clock) Diagram Outputs—External clock high impedance tHEKHOX 18 ns Inputs—Internal clock input setup time tHIIVKH 9— ns Inputs—External clock input setup time tHEIVKH 4— ns Inputs—Internal clock input hold time tHIIXKH 0— ns Inputs—External clock input hold time tHEIXKH 1— ns Notes: 1. Output specifications are measured from the 50% level of the rising edge of QE_CLK_IN to the 50% level of the signal. Timings are measured at the pin. 2. 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, tHIKHOX symbolizes the outputs internal timing (HI) for the time tserial memory clock reference (K) goes from the high state (H) until outputs (O) are invalid (X). Table 29. HDLC AC Timing Specifications1 (continued) Characteristic Symbol2 Min Max Unit Output Z0 = 50 OVDD/2 RL = 50 Serial CLK (Input) tHEIXKH tHEIVKH tHEKHOV Input Signals: (See Note) Output Signals: (See Note) Note: The clock edge is selectable. tHEKHOX |
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