DSP56002FC66 Freescale Semiconductor, DSP56002FC66 Datasheet - Page 104

• Manufacturer Part Number: DSP56002FC66
• Manufacturer: Freescale Semiconductor

Specifications of DSP56002FC66

• Device Core Size: 24b
• Architecture: Harvard
• Format: Fixed Point
• Clock Freq (max): 66MHz
• Mips: 33
• Device Input Clock Speed: 66MHz
• Ram Size: 3KB
• Program Memory Size: 1.5KB
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: -40C to 105C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 132
• Package Type: PQFP
• Lead Free Status / Rohs Status: Supplier Unconfirmed

Design Considerations
Power Consumption
POWER CONSUMPTION
4-4
Equation 3:
Equation 4:
Power dissipation is a key issue in portable DSP applications. The following describes
some factors which affect current consumption. Current consumption is described by
the formula:
where:
For example, for an address pin loaded with a 50 pF capacitance and operating at 5.5
V with a 40 MHz clock, toggling at its maximum possible rate (which is 10 MHz), the
current consumption is:
The maximum internal current value (I
when running the code given below. This represents “typical” internal activity, and is
included as a point of reference. Some applications may consume more or less current
depending on the code used. The typical internal current value (I
what is typically seen when running the given code.
The following steps are recommended for applications requiring very low current
consumption:
1. Minimize external memory accesses; use internal memory accesses instead.
2. Minimize the number of pins that are switching.
3. Minimize the capacitive load on the pins.
4. Connect the unused inputs to pull-up or pull-down resistors.
C = node/pin capacitance
V = voltage swing
f = frequency of node/pin toggle
I
I
=
=
C V f
50 10
Freescale Semiconductor, Inc.
For More Information On This Product,
–
12
5.5 10 10
DSP56002/D, Rev. 3
Go to: www.freescale.com
6
=
2.75mA
CCI
-max), reflects the maximum I
CCI
-typ) reflects
MOTOROLA
CC
expected