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MCF54450VM180 Datasheet(PDF) 5 Page - Freescale Semiconductor, Inc |
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MCF54450VM180 Datasheet(HTML) 5 Page - Freescale Semiconductor, Inc |
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5 / 48 page  Ordering Information MCF5445x ColdFire® Microprocessor Data Sheet, Rev. 3 Freescale Semiconductor 5 2 Ordering Information 3 Hardware Design Considerations 3.1 Analog Power Filtering To further enhance noise isolation, an external filter is strongly recommended for the analog VDD pins (VDD_A_PLL, VDD_RTC). The filter shown in Figure 2 should be connected between the board IVDD and the analog pins. The resistor and capacitors should be placed as close to the dedicated analog VDD pin as possible. The 10-Ω resistor in the given filter is required. Do not implement the filter circuit using only capacitors. The analog power pins draw very little current. Concerns regarding voltage loss across the 10-ohm resistor are not valid. Figure 2. System Analog VDD Power Filter Table 2. Orderable Part Numbers Freescale Part Number Description Package Speed Temperature MCF54450VM180 MCF54450 Microprocessor 256 MAPBGA 180 MHz 0 ° to +70° C MCF54450VM240 240 MHz MCF54451CVM180 MCF54451 Microprocessor 180 MHz –40 ° to +85° C MCF54451VM240 240 MHz 0 ° to +70° C MCF54452CVR200 MCF54452 Microprocessor 360 TEPBGA 200 MHz –40 ° to +85° C MCF54452VR266 266 MHz 0 ° to +70° C MCF54453CVR200 MCF54453 Microprocessor 200 MHz –40 ° to +85° C MCF54453VR266 266 MHz 0 ° to +70° C MCF54454CVR200 MCF54454 Microprocessor 200 MHz –40 ° to +85° C MCF54454VR266 266 MHz 0 ° to +70° C MCF54455CVR200 MCF54455 Microprocessor 200 MHz –40 ° to +85° C MCF54455VR266 266 MHz 0 ° to +70° C Board IVDD 10 Ω 0.1 µF Analog VDD Pin 10 µF GND |
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