参数资料
型号: MC8640DHX1250HE
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 1250 MHz, MICROPROCESSOR, CBGA1023
封装: 33 X 33 MM, CERAMIC, FCBGA-1023
文件页数: 26/130页
文件大小: 1495K
代理商: MC8640DHX1250HE
MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 3
Freescale Semiconductor
121
System Design Information
SENSEVSS_Core1 and needs to be connected to ground with a weak (2–10 kΩ) pull down resistor.
Likewise, AVDD_Core1 needs to be pulled to ground as shown in Figure 64.
The mechanical drawing for the single core device is located in Section 16.2, “Mechanical Dimensions of
For other pin pull-up or pull-down recommendations of signals, please see Section 17, “Signal Listings.”
20.7
Output Buffer DC Impedance
The MPC8640 drivers are characterized over process, voltage, and temperature. For all buses, the driver
is a push-pull single-ended driver type (open drain for I2C).
To measure Z0 for the single-ended drivers, an external resistor is connected from the chip pad to OVDD
or GND. Then, the value of each resistor is varied until the pad voltage is OVDD/2 (see Figure 66). The
output impedance is the average of two components, the resistances of the pull-up and pull-down devices.
When data is held high, SW1 is closed (SW2 is open) and RP is trimmed until the voltage at the pad equals
OVDD/2. RP then becomes the resistance of the pull-up devices. RP and RN are designed to be close to each
other in value. Then, Z0 = (RP + RN) ÷ 2.
Figure 66. Driver Impedance Measurement
Table 73 summarizes the signal impedance targets. The driver impedances are targeted at minimum VDD,
nominal OVDD, 105 °C.
Table 73. Impedance Characteristics
Impedance
DUART, Control,
Configuration, Power
Management
PCI
Express
DDR DRAM
Symbol
Unit
RN
43 Target
25 Target
20 Target
Z0
W
RP
43 Target
25 Target
20 Target
Z0
W
Note: Nominal supply voltages. See Table 1, Tj = 105 °C.
OVDD
OGND
RP
RN
Pad
Data
SW1
SW2
相关PDF资料
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MC8640DHX1067NC 32-BIT, 1067 MHz, MICROPROCESSOR, CBGA1023
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相关代理商/技术参数
参数描述
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MC8640DTHX1000HE 功能描述:微处理器 - MPU G8 REV 3.0 1.05V -40/105C 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
MC8640DTHX1000N 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Integrated Host Processor Hardware Specifications Addendum for the MC8640xTxxyyyyaC Series