MPC5200VR400B 查看數據表（PDF） - Freescale Semiconductor

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MPC5200VR400B

SDRAM/DDR Memory Controller

Freescale Semiconductor 

1.1.4 Electrostatic Discharge

CAUTION

This device contains circuitry that protects against damage due to high-static voltage or

electrical fields. However, it is advised that normal precautions be taken to avoid

application of any voltages higher than maximum-rated voltages. Operational

reliability is enhanced if unused inputs are tied to an appropriate logic voltage level (GND

or VCC). Table 7 gives package thermal characteristics for this device.

Table 5. ESD and Latch-Up Protection Characteristics

Sym

Rating

VHBM

VMM

VCDM

ILAT

ILAT

Human Body Model (HBM)—JEDEC JESD22-A114-B

Machine Model (MM)—JEDEC JESD22-A115

Charge Device Model (CDM)—JEDEC JESD22-C101

Latch-up Current at TA=85 oC

positive

negative

Latch-up Current at TA=27 oC

positive

negative

Min Max Unit SpecID

2000 —

200

—

500

—

+100 —

–100

+200 —

–200

V

D4.1

V

D4.2

V

D4.3

D4.4

mA

D4.5

mA

1.1.5 Power Dissipation

Power dissipation of the MPC5200B is caused by 3 different components: the dissipation of the internal or core digital logic

(supplied by VDD_CORE), the dissipation of the analog circuitry (supplied by SYS_PLL_AVDD and CORE_PLL_AVDD)

and the dissipation of the IO logic (supplied by VDD_IO_MEM and VDD_IO). Table 6 details typical measured core and

analog power dissipation figures for a range of operating modes. However, the dissipation due to the switching of the IO pins

can not be given in general, but must be calculated by the user for each application case using the following formula:

∑ PIO = PIOint + N × C × VDD_IO2 × f

M

Eqn. 1

where N is the number of output pins switching in a group M, C is the capacitance per pin, VDD_IO is the IO voltage swing, f

is the switching frequency and PIOint is the power consumed by the unloaded IO stage. The total power consumption of the

MPC5200B processor must not exceed the value, which would cause the maximum junction temperature to be exceeded.

Ptotal = Pcore + Panalog + PIO

Eqn. 2

MPC5200B Data Sheet, Rev. 4

Freescale Semiconductor

7

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