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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8241EC датащи(PDF) 8 Page - Freescale Semiconductor, Inc |
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MPC8241EC датащи(HTML) 8 Page - Freescale Semiconductor, Inc |
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8 / 58 page  MPC8241 Integrated Processor Hardware Specifications, Rev. 10 8 Freescale Semiconductor Electrical and Thermal Characteristics Figure 2 shows supply voltage sequencing and separation cautions. Figure 2. Supply Voltage Sequencing and Separation Cautions GVDD_OVDD/(LVDD @ 3.3 V - - - -) VDD/AVDD/AVDD2 LVDD @ 5 V Time 3.3 V 5 V 2 V 0 3 6 5 5 6 2 Reset Configuration Pins HRST_CPU and HRST_CTRL PLL Relock Time 3 100 µs Nine External Memory Asserted 255 External Memory HRST_CPU and HRST_CTRL VDD Stable Power Supply Ramp Up 2 See Note 1 Clock Cycles 3 Clock Cycles Setup Time 4 VM = 1.4 V One External Memory Clock Cycle 5 Maximum Rise Time Must be Less Than Notes: 1. Numbers associated with waveform separations correspond to caution numbers listed in Table 2. 2. See the Cautions section of Table 2 for details on this topic. 3. Refer to Table 8 for details on PLL relock and reset signal assertion timing requirements. 4. Refer to Table 10 for details on reset configuration pin setup timing requirements. 5. HRST_CPU/HRST_CTRL must transition from a logic 0 to a logic 1 in less than one SDRAM_SYNC_IN clock cycle for the device to be in the nonreset state. 6. PLL_CFG signals must be driven on reset and must be held for at least 25 clock cycles after the negation of HRST_CTRL and HRST_CPU negate in order to be latched. PLL 6 |
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