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| 型号： | MC7448THX1267NC |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 1267 MHz, RISC PROCESSOR, CBGA360 |
| 封装： | 25 X 25 MM, 2.40 MM HEIGHT, 1.27 MM PITC, CERAMIC, BGA-360 |
| 文件页数： | 37/66页 |
| 文件大小： | 793K |
| 代理商： | MC7448THX1267NC |
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MPC7448 RISC Microprocessor Hardware Specifications, Rev. 4
42
Freescale Semiconductor
System Design Information
9.4
Output Buffer DC Impedance
The MPC7448 processor bus drivers are characterized over process, voltage, and temperature. To measure
Z0, an external resistor is connected from the chip pad to OVDD or GND. The value of each resistor is
Figure 20. Driver Impedance Measurement
The output impedance is the average of two components—the resistances of the pull-up and pull-down
devices. When data is held low, SW2 is closed (SW1 is open), and RN is trimmed until the voltage at the
pad equals OVDD/2. RN then becomes the resistance of the 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.
Table 15 summarizes the signal impedance results. The impedance increases with junction temperature
and is relatively unaffected by bus voltage.
9.5
Pull-Up/Pull-Down Resistor Requirements
The MPC7448 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 MPC7448 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
Table 15. Impedance Characteristics
At recommended operating conditions. See Table 4
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 |
|---|---|
| MC7448THX1267ND | 功能描述:微处理器 - MPU A8 RV2.2.1 1.1V -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 |
| MC7448THX1267NX | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Hardware Specifications Addendum for the MC7448T xxnnnnmx Series |
| MC7448THX1400ND | 功能描述:微处理器 - MPU A8 RV2.2.1 1.1V -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 |
| MC7448THX1400NX | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Hardware Specifications Addendum for the MC7448T xxnnnnmx Series |
| MC7448THX1700LD | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Hardware Specifications Addendum for the MC7448T xxnnnnmx Series |
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