参数资料
| 型号： | PCX7447AVGH1000NB |
| 厂商： | Atmel |
| 文件页数： | 37/52页 |
| 文件大小： | 0K |
| 描述： | IC MPU 32BIT 1000MHZ 360CBGA |
| 标准包装： | 44 |
| 处理器类型： | PowerPC 32-位 RISC |
| 速度： | 1.0GHz |
| 电压： | 1.1V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 360-CBBGA 裸露焊盘 |
| 供应商设备封装： | 360-CBGA（25x25） |
| 包装： | 托盘 |
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42
0833E–HIREL–01/07
PC7447A
e2v semiconductors SAS 2007
For backward compatibility with the PC7447 to the PC7447A, the new power and ground signals (for-
merly NC, see Table 8-1 on page 21) may be left unconnected. There is no performance degradation
associated with leaving these pins unconnected. However, future devices may require these additional
power and ground signals to be connected to achieve maximum performance, and it is recommended
that new designs include the additional connections to facilitate future upgrades. See also section
“Pinout Listings” on page 21 for additional information.
12.5
Output Buffer DC Impedance
The PC7447A processor bus drivers are characterized over process, voltage, and temperature. To mea-
sure Z
0, an external resistor is connected from the chip pad to OVDD or GND. The value of each resistor
is varied until the pad voltage is OV
DD/2. Figure 12-2 on page 42 shows the 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 R
N is trimmed until the voltage at the
pad equals OV
DD/2. RN then becomes the resistance of the pull-down devices. When data is held high,
SW1 is closed (SW2 is open), and R
P is trimmed until the voltage at the pad equals OVDD/2. RP then
becomes the resistance of the pull-up devices. R
P and RN are designed to be close to each other in
value. Then, Z
0 = (RP + RN)/2.
Figure 12-2. Driver Impedance Measurement
Table 12-2 summarizes the signal impedance results. The impedance increases with junction tempera-
ture and is relatively unaffected by bus voltage.
Table 12-2.
Impedance Characteristics with V
DD = 1.5V, OVDD = 1.8V ±5%, Tj = 5° - 85°C
Impedance
Processor bus
L3 Bus
Unit
Z0
Typical
33 – 42
34 – 42
Maximum
31 – 51
32 – 44
OVDD
OGND
SW2
SW1
RN
RP
Pad
Data
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相关代理商/技术参数 |
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| PCX7447AVGH1167NB | 功能描述:IC MPU 32BIT 1167MHZ 360CBGA RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微处理器 系列:- 标准包装:60 系列:SCC 处理器类型:Z380 特点:全静电 Z380 CPU 速度:20MHz 电压:5V 安装类型:表面贴装 封装/外壳:144-LQFP 供应商设备封装:144-LQFP 包装:托盘 |
| PCX7448MGH1000NC | 制造商:e2v technologies 功能描述:MPU RISC 32BIT 0.09UM 1GHZ 1.5V/1.8V/2.5V 360HITCE CBGA - Trays |
| PCX7448MGH1250NC | 制造商:e2v technologies 功能描述:PCX7448MGH1250NC - Trays |
| PCX7448VGH1000NC | 制造商:e2v technologies 功能描述:PCX7448VGH1000NC - Trays |
| PCX7448VGH1250NC | 制造商:e2v technologies 功能描述:MPU RISC 32BIT 0.09UM 1.25GHZ 1.5V/1.8V/2.5V 360HITCE CBGA - Trays |
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