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參數(shù)資料
| 型號： | PC755CMZFU350LE |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | PowerPC 755/745 RISC Microprocessor |
| 中文描述： | 32-BIT, 350 MHz, RISC PROCESSOR, PBGA360 |
| 封裝： | 25 X 25 MM, FLIP-CHIP, PLASTIC, BGA-360 |
| 文件頁數(shù)： | 46/50頁 |
| 文件大小： | 1064K |
| 代理商： | PC755CMZFU350LE |
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46
PC755/745
2138D–HIREL–06/03
In addition, it is recommended that there be several bulk storage capacitors distributed
around the PCB, feeding the
V
DD
, L2O
V
DD
, and OV vplanes, to enable quick recharging
of the smaller chip capacitors. These bulk capacitors should have a low ESR (equivalent
series resistance) rating to ensure the quick response time necessary. They should also
be connected to the power and ground planes through two vias to minimize inductance.
Suggested bulk capacitors – 100-330 μF (AVX TPS tantalum or Sanyo OSCON).
Connection
Recommendations
To ensure reliable operation, it is highly recommended to connect unused inputs to an
appropriate signal level through a resistor. Unused active low inputs should be tied to
O
V
DD
. Unused active high inputs should be connected to GND. All NC (no-connect) sig-
nals must remain unconnected.
Power and ground connections must be made to all external
V
DD
, O
V
DD
, L2O
V
DD
, and
GND pins of the PC755.
Output Buffer DC Impedance
The PC755 60x and L2 I/O drivers are characterized over process, voltage, and temper-
ature. To measure Z
0
, an external resistor is connected from the chip pad to (L2)OV
DD
or
GND. Then, the value of each resistor is varied until the pad voltage is (L2)O
V
DD
/2 (See
Figure 33).
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 (L2)O
V
DD
/2. R
N
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 (L2)O
V
DD
/2. R
P
then becomes the resis-
tance of the pull-up devices.
NO TAG describes the driver impedance measurement circuit described above.
Figure 32.
Driver Impedance Measurement Circuit
(L2)OV
DD
OGND
R
P
R
N
Pad
Data
SW1
SW2
(L2)OV
DD
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PC755CMZFU366LE | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:PowerPC 755/745 RISC Microprocessor |
| PC755CMZFU400LE | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:PowerPC 755/745 RISC Microprocessor |
| PC755CVGH400LE | 制造商:e2v technologies 功能描述:POWERPC 755 32-BIT RISC MICROPROCESSOR - 400MHZ, 2.0V, HITCE, IND TEMP 制造商:e2v technologies 功能描述:MPU RISC 32BIT 0.22UM 400MHZ 2.5V/3.3V 360HITCE CBGA - Trays |
| PC755CVGHU300LE | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:PowerPC 755/745 RISC Microprocessor |
| PC755CVGHU350LE | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:PowerPC 755/745 RISC Microprocessor |
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