dsp56001a Freescale Semiconductor, Inc, dsp56001a Datasheet - Page 80

• Manufacturer Part Number: dsp56001a
• Description: 24-bit Digital Signal Processor
• Manufacturer: Freescale Semiconductor, Inc

DSP56001A
Electrical Design Considerations
ELECTRICAL DESIGN CONSIDERATIONS
Use the following list of recommendations to assure correct DSP operation:
4-6
• Provide a low-impedance path from the board power supply to each V
• Use at least four 0.1 F bypass capacitors positioned as close as possible to the four sides
• Ensure that capacitor leads and associated printed circuit traces that connect to the chip
• Use at least a four-layer Printed Circuit Board (PCB) with two inner layers for V
• Because the DSP output signals have fast rise and fall times, PCB trace lengths should be
• Consider all device loads, as well as parasitic capacitance due to PCB traces, when
• All inputs must be terminated (i.e., not allowed to float) using CMOS levels.
and from the board ground to each GND pin.
of the package to connect the V
V
GND.
minimal. This recommendation particularly applies to the address and data buses as well
as the RD, WR, IRQA, IRQB, NMI, HEN, and HACK pins.
calculating capacitance. This is especially critical in systems with higher capacitive loads
that could create higher transient currents in the V
CC
and GND pins are less than 0.5 inch per capacitor lead.
This device contains protective circuitry to
guard against damage due to high static
voltage or electrical fields. However, normal
precautions are advised to avoid application
of any voltages higher than maximum rated
voltages to this high-impedance circuit.
Reliability of operation is enhanced if unused
inputs are tied to an appropriate logic voltage
level (e.g., either GND or V
Freescale Semiconductor, Inc.
For More Information On This Product,
DSP56001A/D, Rev. 1
CC
Go to: www.freescale.com
power source to GND.
CAUTION
CC
).
CC
and GND circuits.
CC
pin on the DSP,
MOTOROLA
CC
and