參數(shù)資料
型號: MCF5275CVM166
廠商: Freescale Semiconductor
文件頁數(shù): 3/44頁
文件大小: 0K
描述: IC MCU 32BIT 166MHZ 256-MAPBGA
標準包裝: 90
系列: MCF527x
核心處理器: Coldfire V2
芯體尺寸: 32-位
速度: 166MHz
連通性: EBI/EMI,以太網(wǎng),I²C,SPI,UART/USART,USB
外圍設(shè)備: DMA,WDT
輸入/輸出數(shù): 69
程序存儲器類型: ROMless
RAM 容量: 64K x 8
電壓 - 電源 (Vcc/Vdd): 1.4 V ~ 1.6 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 256-LBGA
包裝: 散裝
Design Recommendations
MCF5275 Integrated Microprocessor Family Hardware Specification, Rev. 4
Freescale Semiconductor
11
5.2.1.2
Power Down Sequence
If VDD is powered down first, then sense circuits in the I/O pads cause all output drivers to be in a high
impedance state. There is no limit on how long after VDD powers down before OVDD, SDVDD, or PLLVDD
must power down. VDD should not lag OVDD, SDVDD, or PLLVDD going low by more than 0.4 V during
power down or undesired high current will be in the ESD protection diodes. There are no requirements for
the fall times of the power supplies.
The recommended power down sequence is as follows:
1. Drop VDD to 0 V.
2. Drop OVDD/SDVDD/PLLVDD supplies.
5.3
Decoupling
Place the decoupling capacitors as close to the pins as possible, but they can be outside the footprint
of the package.
0.1
μF and 0.01 μF at each supply input
5.4
Buffering
Use bus buffers on all data/address lines for all off-board accesses and for all on-board accesses
when excessive loading is expected. See electricals.
5.5
Pull-up Recommendations
Use external pull-up resistors on unused inputs. See pin table.
5.6
Clocking Recommendations
Use a multi-layer board with a separate ground plane.
Place the crystal and all other associated components as close to the EXTAL and XTAL (oscillator
pins) as possible.
Do not run a high frequency trace around crystal circuit.
Ensure that the ground for the bypass capacitors is connected to a solid ground trace.
Tie the ground trace to the ground pin nearest EXTAL and XTAL. This prevents large loop currents
in the vicinity of the crystal.
Tie the ground pin to the most solid ground in the system.
Do not connect the trace that connects the oscillator and the ground plane to any other circuit
element. This tends to make the oscillator unstable.
Tie XTAL to ground when an external oscillator is clocking the device.
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相關(guān)代理商/技術(shù)參數(shù)
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MCF5275CVM166 制造商:Freescale Semiconductor 功能描述:Microprocessor IC
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