- 您现在的位置：买卖IC网 > PDF目录261241 > IBM25EMPPC740LDBA3330 32-BIT, 333 MHz, RISC PROCESSOR, CBGA255 PDF资料下载
参数资料
| 型号： | IBM25EMPPC740LDBA3330 |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 333 MHz, RISC PROCESSOR, CBGA255 |
| 封装： | 21 X 21 MM, 1.27 MM PITCH, CERAMIC, BGA-255 |
| 文件页数： | 36/50页 |
| 文件大小： | 600K |
| 代理商： | IBM25EMPPC740LDBA3330 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页当前第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页
5/20/99
Version 1.51
PowerPC 740 and PowerPC 750 Datasheet
Page 37
PowerPC 740 and PowerPC 750 Embedded Microprocessor
IBM CMOS 0.20 um Copper Technology EMPPC740L and EMPPC750L
External clock routing should ensure that the rising-edge of the L2 clock is coincident at the CLK input of all
SRAMs and at the L2SYNC_IN input of the 750. The L2CLKOUTA network could be used only, or the
L2CLKOUTB network could also be used depending on the loading, frequency, and number of SRAMs.
Output Buffer DC Impedance
The 750 60x and L2 I/O drivers were characterized over process, voltage, and temperature. To measure Z0,
an external resistor is connected to the chip pad, either to OV
DD or GND. Then the value of such resistor is
varied until the pad voltage is OV
The output impedance is actually the average of two components, the resistances of the pull-up and pull-
down devices. When Data is held low, SW1 is closed (SW2 is open), and R
N is trimmed until Pad = OVDD/2. RN
then becomes the resistance of the pull-down devices. When Data is held high, SW2 is closed (SW1 is open),
and R
P is trimmed until Pad = OVDD/2. RP then becomes the resistance of the pull-up devices. With a properly
designed driver R
P and RN are close to each other in value, then Z0 = (RP + RN)/2.
The following table summarizes the impedance a board designer would design to for a typical process. These
values were derived by simulation at 65
°C. As the process improves, the output impedance will be lower by
several ohms than this typical value.
Figure 19. Driver Impedance Measurement
Impedance Characteristics
V
DD = 1.9VDC, L2OVDD=OVDD = 3.3VDC,
T
J
= 65°C
Process
60x
L2
Symbol
Unit
Typical
43
38
Z
0
Data
OV
DD
R
N
SW2
SW1
Pad
R
P
GND
相关PDF资料 |
PDF描述 |
|---|---|
| IBM25EMPPC740LDBF4000 | 32-BIT, 400 MHz, RISC PROCESSOR, CBGA255 |
| IBM25EMPPC740LFBC4000 | 32-BIT, 400 MHz, RISC PROCESSOR, CBGA255 |
| IBM25EMPPC750LCBA4660 | 32-BIT, 466 MHz, RISC PROCESSOR, CBGA360 |
| IBM25EMPPC750LDBF4660 | 32-BIT, 466 MHz, RISC PROCESSOR, CBGA360 |
| IBM25EMPPC750LEBB3000 | 32-BIT, 300 MHz, RISC PROCESSOR, CBGA360 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IBM25EMPPC740LEBA300 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:32-Bit Microprocessor |
| IBM25EMPPC740LEBA333 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:32-Bit Microprocessor |
| IBM25EMPPC740LEBA366 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:32-Bit Microprocessor |
| IBM25EMPPC740LEBA400 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:32-Bit Microprocessor |
| IBM25EMPPC740LEBA466 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:32-Bit Microprocessor |
发布紧急采购，3分钟左右您将得到回复。