- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄367800 > PC755BMZFU400LD MICROPROCESSOR|32-BIT|CMOS|BGA|360PIN|PLASTIC PDF資料下載
參數(shù)資料
| 型號： | PC755BMZFU400LD |
| 英文描述： | MICROPROCESSOR|32-BIT|CMOS|BGA|360PIN|PLASTIC |
| 中文描述： | 微處理器| 32位|的CMOS | BGA封裝| 360PIN |塑料 |
| 文件頁數(shù)： | 45/48頁 |
| 文件大?。?/td> | 276K |
| 代理商： | PC755BMZFU400LD |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁當(dāng)前第45頁第46頁第47頁第48頁
PC755B/745B
45/48
Figure 30 describes the alternate driver impedance measurement circuit.
(L2)OVdd
BGA
Pin
Data
Vforce
OGND
Figure 30 : Alternate Driver Impedance Measurement Curcuit
Table 19 summarizes the signal impedance results. The driver impedance values were characterized at 0 C, 65 C, and 105 C. The
impedance increases with junction temperature and is relatively unaffected by bus voltage.
Table 19. Impedance Characteristics
Vdd = 2.0V, OVdd = 3.3V, Tc = 0 - 105 C
Impedance
Processor bus
L2 bus
Symbol
Unit
R
N
25-36
25-36
Z
0
Ohms
R
P
26-39
26-39
Z
0
Ohms
9.6. Pull-up Resistor Requirements
The PC755B requires high-resistive (weak: 10 K
) 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 PC755B or other bus masters. These pins are
TS, ABB, ARTRY.
In addition, the PC755B has one open-drain style output that requires a pull-up resistor (weak or stronger: 4.7 K
W
–10 K
W
) if it is
used by the system. This pin is CKSTP_OUT.
During inactive periods on the bus, the address and transfer attributes may not be driven by any master and may therefore float in the
high-impedance state for relatively long periods of time. Since the PC755B must continually monitor these signals for snooping, this
float condition may cause excessive power draw by the input receivers on the PC755B or by other receivers in the system. It is recom-
mended that these signals be pulled up through weak (10 K
)
pull-up resistors by the system, or that they may be otherwise driven by
the system during inactive periods of the bus. The snooped address and transfer attribute inputs are:
A[0:31], AP[0:3], TT[0:4], TBST and GBL.
The data bus input receivers are normally turned off when no read operation is in progress and therefore do not require pull-up resis-
tors on the bus. Other data bus receivers in the system, however, may require pullups, or that those signals be otherwise driven by the
system during inactive periods by the system. The data bus signals are: DH[0:31],DL[0:31] andDP[0:7]
If 32-bit data bus mode is selected, the input receivers of the unused data and parity bits will be disabled, and their outputs will drive
logic zeros when they would otherwise normally be driven. For this mode, these pins do not require pull-up resistors, and should be left
unconnected by the system to minimize possible output switching.
If address or data parity is not used by the system, and the respective parity checking is disabled through HID0, the input receivers for
those pins are disabled, and those pins do not require pull-up resistors and should be left unconnected by the system. If all parity
generation is disabled through HID0, then all parity checking should also be disabled through HID0, and all parity pins may be left
unconnected by the system.
The L2 interface does not normally require pull-up resistors.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PC755BVZFU300LD | MICROPROCESSOR|32-BIT|CMOS|BGA|360PIN|PLASTIC |
| PC755 | PowerPC 755/745 RISC Microprocessor |
| PC755M8 | PC755M8 [Updated 6/03. 35 Pages] 32-bit RISC PowerPC-based Multichip Module |
| PC755CMGHU300LE | PowerPC 755/745 RISC Microprocessor |
| PC755CMGHU350LE | PowerPC 755/745 RISC Microprocessor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PC755BVGH300LE | 制造商:e2v technologies 功能描述:PC755BVGH300LE - Trays |
| PC755BVGH350LE | 制造商:e2v technologies 功能描述:POWERPC 755 32-BIT RISC MICROPROCESSOR - 350MHZ, 2.0V, HITCE, IND TEMP 制造商:e2v technologies 功能描述:MPU RISC 32BIT 0.22UM 350MHZ 2.5V/3.3V 360HITCE CBGA - Trays |
| PC755BVGU300LE | 制造商:e2v technologies 功能描述:PC755BVGU300LE - Trays |
| PC755BVGU350LE | 制造商:e2v technologies 功能描述:PC755BVGU350LE - Trays |
| PC755BVZFU300LD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MICROPROCESSOR|32-BIT|CMOS|BGA|360PIN|PLASTIC |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。