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參數(shù)資料
| 型號： | MC56603APV60 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | 24-BIT, 60 MHz, OTHER DSP, PQFP144 |
| 封裝： | PLASTIC, TQFP-144 |
| 文件頁數(shù)： | 87/97頁 |
| 文件大?。?/td> | 1080K |
| 代理商： | MC56603APV60 |
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4-4
DSP56603A Technical Data Sheet
MOTOROLA
DSP56603A
Power Consumption Considerations
Because all output pins on the DSP56603A have fast rise and fall times, PCB
trace interconnection length should be minimized in order to minimize
undershoot and reflections caused by these fast output switching times. This
recommendation particularly applies to the address and data buses, as well as
to the Port A control signals and Port B pins. Maximum PCB trace lengths on
the order of 6 inches (15.24 cm) are recommended.
Capacitance calculations should consider all device loads as well as parasitic
capacitances due to the PCB traces. Attention to proper PCB layout and
bypassing becomes especially critical in systems with higher capacitive loads
because these loads create higher transient currents in the VCC and GND
circuits.
Drive to a valid value (e.g., connect to pull-up or pull-down resistors) all
unused inputs or signals that will be inputs during reset (RESET asserted).
Every input pin should be driven to a valid value after the RESET deassertion
by connecting it to a pull-up or pull-down resistor if not used. Exceptions to
this are the TRST, DE, and TMS pins, which have internal pull-up resistors.
The RESET and TRST pins must be asserted low after power-up.
All this data relates to a single DSP56603A. If multiple DSP56603A devices are
on the same board, check for cross-talk or excessive spikes on the supplies
caused by synchronous operation of the devices.
The DSP56603A cannot tolerate 5-volt I/O.
POWER CONSUMPTION CONSIDERATIONS
Power dissipation is a key issue in portable DSP applications. This section describes
some of the factors that affect current consumption. Most of the current consumed by
CMOS devices is Alternating Current (AC), which is charging and discharging the
capacitances of the pins and internal nodes. Therefore, the total current consumption
is the sum of these internal and external currents.
This current consumption is described by the formula:
Equation 3:
I = C
V f
where: C =
node/pin capacitance (in Farads)
V =
voltage swing (in volts)
f
=
frequency of node/pin toggle (in Hz)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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