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参数资料
| 型号： | MCF5474VR266 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 266.66 MHz, RISC PROCESSOR, PBGA388 |
| 封装： | 27 X 27 MM, MS-034AAL-1, PBGA-388 |
| 文件页数： | 32/34页 |
| 文件大小： | 600K |
| 代理商： | MCF5474VR266 |
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Hardware Design Considerations
MCF547x ColdFire Microprocessor, Rev. 4
Freescale Semiconductor
7
Figure 3. Supply Voltage Sequencing and Separation Cautions
The relationship between SD VDD and EVDD is non-critical during power-up and power-down sequences. SD VDD (2.5V or
3.3V) and EVDD are specified relative to IVDD.
4.2.1
Power Up Sequence
If EVDD/SD VDD are powered up with the IVDD at 0V, the sense circuits in the I/O pads cause all pad output drivers connected
to the EVDD/SD VDD to be in a high impedance state. There is no limit to how long after EVDD/SD VDD powers up before IVDD
must power up. IVDD should not lead the EVDD, SD VDD, or PLL VDD by more than 0.4V during power ramp up or there is
high current in the internal ESD protection diodes. The rise times on the power supplies should be slower than 1 microsecond
to avoid turning on the internal ESD protection clamp diodes.
The recommended power up sequence is as follows:
1. Use 1 microsecond or slower rise time for all supplies.
2. IVDD/PLL VDD and EVDD/SD VDD should track up to 0.9V, then separate for the completion of ramps with EVDD/SD
VDD going to the higher external voltages. One way to accomplish this is to use a low drop-out voltage regulator.
4.2.2
Power Down Sequence
If IVDDPLL VDD are powered down first, 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 IVDD and PLL VDD power down before EVDD or SD VDD must power down. IVDD should
not lag EVDD, SD VDD, or PLL VDD going low by more than 0.4V during power down or there is 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 IVDD/PLL VDD to 0V
2. Drop EVDD/SD VDD supplies
EVDD, SD VDD (3.3V)
SD VDD (2.5V)
IVDD, PLL VDD
Supplies Stable
2
1
3.3V
2.5V
1.5V
0
Time
NOTES:
IVDD should not exceed EVDD or SD VDD by more than 0.4V
at any time, including power-up.
Recommended that IVDD/PLL VDD should track EVDD/SD VDD up to
0.9V, then separate for completion of ramps.
Input voltage must not be greater than the supply voltage (EVDD, SD VDD,
IVDD, or PLL VDD) by more than 0.5V at any time, including during power-up.
Use 1 microsecond or slower rise time for all supplies.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCF5474VR266 | 制造商:Freescale Semiconductor 功能描述:Microprocessor IC |
| MCF5474ZP200 | 功能描述:微处理器 - MPU MCF547X V4ECORE MMU FPU RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| MCF5474ZP266 | 功能描述:微处理器 - MPU MCF547X V4ECORE MMU FPU RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| MCF5475 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:MCF547x Integrated Microprocessor Electrical Characteristics |
| MCF5475EC | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:MCF547x ColdFire Microprocessor |
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