DSP56004ROM datasheet(80/82 Pages) FREESCALE

80 / 82 page

4-6

DSP56004/D, Rev. 3

MOTOROLA

Design Considerations

Power-Up Considerations

POWER-UP CONSIDERATIONS

To power-up the device properly, ensure that the following conditions are met:

•

Stable power is applied to the device according to the specifications in Table

2-3

(DC Electrical Characteristics).

•

The external clock oscillator is active and stable.

•

RESET is asserted according to the specifications in Table 2-7 (Reset, Stop,

Mode Select, and Interrupt Timing).

•

The following input pins are driven to valid voltage levels: DR, PINIT,

MODA, MODB, and MODC.

Care should be taken to ensure that the maximum ratings for all input voltages obey

the restrictions on Table 2-1 (Maximum Ratings), at all phases of the power-up

procedure. This may be achieved by powering the external clock, hardware reset, and

mode selection circuits from the same power supply that is connected to the power

supply pins of the chip.

At the beginning of the hardware reset procedure, the device might consume

significantly more current than the specified typical supply current. This is because of

contentions among the internal nodes being affected by the hardware reset signal

until they reach their final hardware reset state.

Freescale Semiconductor, Inc.

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DSP56004ROM Datasheet(PDF) 80 Page - Freescale Semiconductor, Inc