參數(shù)資料
型號(hào)： MCF5235CVM150
廠商： FREESCALE SEMICONDUCTOR INC
元件分類(lèi)： 微控制器/微處理器
英文描述： 32-BIT, 150 MHz, RISC PROCESSOR, PBGA256
封裝： ROHS COMPLIANT, MAPBGA-256
文件頁(yè)數(shù)： 3/48頁(yè)
文件大小： 666K
代理商： MCF5235CVM150
Design Recommendations
MCF523x Integrated Microprocessor 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/VDDPLL must power
down. VDD should not lag OVDD or VDDPLL going low by more than 0.4 V during power down or there
will be undesired high current 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/VDDPLL supplies.
5.3
Decoupling
Place the decoupling caps 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 Section 7, “Electrical Characteristics.”
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.
相關(guān)PDF資料
PDF描述
MCF5235CVF150 32-BIT, 150 MHz, RISC PROCESSOR, PBGA256
MCF5249CVF140 32-BIT, 140 MHz, RISC PROCESSOR, PBGA160
MCF5249VM140 32-BIT, 140 MHz, RISC PROCESSOR, PBGA160
MCF5249VF140 32-BIT, 140 MHz, RISC PROCESSOR, PBGA160
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCF5235CVM150 制造商:Freescale Semiconductor 功能描述:Microprocessor IC
MCF5235CVM150J 功能描述:32位微控制器 - MCU V2CORE 64KSRAM RoHS:否 制造商:Texas Instruments 核心:C28x 處理器系列:TMS320F28x 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:90 MHz 程序存儲(chǔ)器大小:64 KB 數(shù)據(jù) RAM 大小:26 KB 片上 ADC:Yes 工作電源電壓:2.97 V to 3.63 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:LQFP-80 安裝風(fēng)格:SMD/SMT
MCF5235CVM150J 制造商:Freescale Semiconductor 功能描述:IC 32-BIT MPU 150 MHz 256-BGA
MCF5235EC 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Integrated Microprocessor Hardware Specification
MCF523X 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Integrated Microprocessor Hardware Specification
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