參數(shù)資料
型號(hào)： MSC8102M4000
廠商： MOTOROLA INC
元件分類： 數(shù)字信號(hào)處理
英文描述： 32-BIT, 75 MHz, OTHER DSP, CBGA431
封裝： 20 X 20 MM, FLIP CHIP, CERAMIC, BGA-431
文件頁(yè)數(shù)： 90/96頁(yè)
文件大?。?/td> 1557K
代理商： MSC8102M4000
4-2
Power Supply Design Considerations
The input voltage must not exceed the I/O supply VDDH by more than 2.5 V at any time, including during
power-on reset. In turn VDDH must not exceed VDD/VCCSYN by more than 2.6 V at any time, including
during power-on reset. VDD/VCCSYN must not exceed VDDH by more than 0.4 V at any time, including
during power-on reset. Therefore the recommendation is to use “bootstrap” diodes between the power
rails, as shown in Figure 4-1.
Select the bootstrap diodes such that a nominal VDD/VCCSYN is sourced from the VDDH power supply
until the VDD/VCCSYN power supply becomes active. In Figure 4-1, four MUR420 Schottky barrier
diodes are connected in series; each has a forward voltage (VF) of 0.6 V at high currents, so these diodes
provide a 2.4 V drop, maintaining 0.9 V on the 1.6 V power line. Once the core/PLL power supply
stabilizes at 1.6 V, the bootstrap diodes will be reverse biased with negligible leakage current. The VF
should be effective at the current levels required by the processor. Do not use diodes with a nominal VF
that drops too low at high current.
Figure 4-2 shows the recommended power decoupling circuit for the core power supply. The voltage
regulator and the decoupling capacitors should supply the required device current without any drop in
voltage on the device pins. The voltage on the package pins should not drop below 1.5 V even for a very
short spikes. This can be achieved by using the following guidelines:
For the core supply, use a voltage regulator rated at 1.6 V with nominal rating of at least 3 A. This
rating does not reflect actual average current draw, but is recommended because it resists changes
imposed by transient spikes and has better voltage recovery time than supplies with lower current
ratings.
Decouple the supply using low-ESR capacitors mounted as close as possible to the socket.
Figure 4-2 shows three capacitors in parallel to reduce the resistance. Three capacitors is a recommended
minimum number.
Figure 4-1. Bootstrap Diodes for Power-Up Sequencing
I/O Power
Core/PLL
Supply
MUR420
3.3 V (VDDH)
1.6 V (VDD/VCCSYN)
相關(guān)PDF資料
PDF描述
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MSC8122TVT4800V 32-BIT, 300 MHz, OTHER DSP, PBGA431
MSC8122MP8000 32-BIT, 500 MHz, OTHER DSP, PBGA431
MSC8144ETVT800B 133 MHz, OTHER DSP, PBGA783
MSC8144EVT1000A 133 MHz, OTHER DSP, PBGA783
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