參數(shù)資料
型號: FW82439TX
英文描述: Controller Miscellaneous - Datasheet Reference
中文描述: 控制器雜項(xiàng)-數(shù)據(jù)表參考
文件頁數(shù): 17/102頁
文件大?。?/td> 759K
代理商: FW82439TX
Extended Temperature 82439TX (MTXC) Datasheet
17
PRELIMINARY
Table 1. MTXC Internal Power Planes
Power
Plane
Description
Signals Powered
V
CC
Pins
GND
Pins
MAIN
Contains all the rest of the MTXC logic. This
plane is powered by the main system power
supply.
All Other Signal Pins
V
CC
V
SS
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 (FIX SYMBOL- See hardcopy)
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. VCC(SUS) can power up and power down independent of all other
power planes.
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