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| 型号： | MC7447AVS1000LB |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 1000 MHz, RISC PROCESSOR, CBGA360 |
| 封装： | 25 X 25 MM, 2.20 MM HEIGHT, 1.27 MM PITCH, ROHS COMPLIANT, CERAMIC, LGA-360 |
| 文件页数： | 33/58页 |
| 文件大小： | 1095K |
| 代理商： | MC7447AVS1000LB |
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MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
39
System Design Information
Figure 18. Driver Impedance Measurement
Table 15 summarizes the signal impedance results. The impedance increases with junction temperature
and is relatively unaffected by bus voltage.
9.6
Pull-Up/Pull-Down Resistor Requirements
The MPC7447A requires high-resistive (weak: 4.7 K
Ω) pull-up resistors on several control pins of the bus
interface to maintain the control signals in the negated state after they have been actively negated and
released by the MPC7447A or other bus masters. These pins are: TS, ARTRY, SHDO, and SHD1.
Some pins designated as being factory test pins must be pulled up to OVDD or down to GND to ensure
proper device operation. The pins that must be pulled up to OVDD are: LSSD_MODE and TEST[0:3]; the
pins that must be pulled down to GND are: L1_TSTCLK and TEST[4]. The CKSTP_IN signal should
likewise be pulled up through a pull-up resistor (weak or stronger: 4.7 K
Ω–1 KΩ) to prevent erroneous
assertions of this signal.
In addition, the MPC7447A has one open-drain style output that requires a pull-up resistor (weak or
stronger: 4.7 K
Ω–1 KΩ) if it is used by the system. This pin is CKSTP_OUT.
If pull-down resistors are used to configure BVSEL, the resistors should be less than 250
Ω (see Table 12).
Because PLL_CFG[0:4] must remain stable during normal operation, strong pull-up and pull-down
resistors (1 K
Ω or less) are recommended to configure these signals in order to protect against erroneous
switching due to ground bounce, power supply noise or noise coupling.
Table 15. Impedance Characteristics
VDD = 1.5 V, OVDD = 1.8 V ± 5%, Tj = 5°–85°C
Impedance
Processor Bus
Unit
Z0
Typical
33–42
Ω
Maximum
31–51
Ω
OVDD
OGND
RP
RN
Pad
Data
SW1
SW2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC7447AVS1000NB | 功能描述:微处理器 - MPU A7PM LGA RV1.1 1.1V 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 |
| MC7447AVS1167NB | 功能描述:微处理器 - MPU A7PM PB FREE 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 |
| MC7447AVS1267LB | 功能描述:微处理器 - MPU A7PM LGA RV1.1 1.1V 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 |
| MC7447AVS1333LB | 功能描述:微处理器 - MPU A7PM LGA RV1.1 1.1V 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 |
| MC7447AVS1420LB | 功能描述:微处理器 - MPU A7PM PB FREE 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 |
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