參數(shù)資料
型號: 82439TX
廠商: INTEL CORP
元件分類: 存儲控制器/管理單元
英文描述: System Controller(系統(tǒng)控制器)
中文描述: 256M X 8, DRAM CONTROLLER, PBGA324
封裝: BGA-324
文件頁數(shù): 16/83頁
文件大?。?/td> 461K
代理商: 82439TX
82439TX (MTXC)
E
16
PRELIMINARY
NOTES:
1.
KRQAK is not part of the suspend well. When this pin is used as the 5
considerations must be taken.
th
RAS line (CS4_64), special
2.4.
Power Sequencing Requirements
The V
CC
5REF signal must be tied to 5V in a system requiring 5V tolerance. In a 5V tolerant system, V
CC
5REF
must power up before or simultaneous to V
CC
. It must power down after or simultaneous to V
CC
. At any time,
V
CC
5REF should not be more than 0.6 volts below V
CC
. In a non-5V tolerant system (3.3V only), this signal can
be tied directly to V
CC
. In this case, there are no sequencing requirements. Refer to Figure 2 for an example
circuit schematic which may be used to ensure the proper V
CC
5REF sequencing.
Vcc Supply
(3.3V)
5V Supply
1 k
1 uF
To System
VREF
To System
pwr_seq
Figure 2. Example V
CC
5REF Sequencing Circuit
The V
CC
(CPU) power plane is tied to either 2.5 volts or 3.3 volts, depending on the voltage level of the CPU
interface. In a system that ties this power plane to 2.5 volts, the V
CC
(CPU) pins must power up after or
simultaneous to V
CC
. It must power down before or simultaneous to V
CC
. At any time, V
CC
should not be more
than 1.2 volts below the V
CC
(CPU) plane.
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