ADSP-2183
–13–
REV. C
TIMING PARAMETERS
GENERAL NOTES
Use the exact timing information given. Do not attempt to
derive parameters from the addition or subtraction of others.
While addition or subtraction would yield meaningful results for
an individual device, the values given in this data sheet reflect
statistical variations and worst cases. Consequently, you cannot
meaningfully add up parameters to derive longer times.
TIMING NOTES
Switching Characteristics specify how the processor changes its
signals. You have no control over this timing—circuitry external
to the processor must be designed for compatibility with these
signal characteristics. Switching characteristics tell you what the
processor will do in a given circumstance. You can also use switch-
ing characteristics to ensure that any timing requirement of a
device connected to the processor (such as memory) is satisfied.
Timing Requirements apply to signals that are controlled by cir-
cuitry external to the processor, such as the data input for a read
operation. Timing requirements guarantee that the processor
operates correctly with other devices.
MEMORY TIMING SPECIFICATIONS
The table below shows common memory device specifications
and the corresponding ADSP-2183 timing parameters, for your
convenience.
Memory
ADSP-2183 Timing
Device
Timing
Parameter
Specification
Parameter
Definition
Address Setup to
tASW
A0–A13,
xMS Setup before
Write Start
WR Low
Address Setup to
tAW
A0–A13,
xMS Setup before
Write End
WR Deasserted
Address Hold Time
tWRA
A0–A13,
xMS Hold after
WR Deasserted
Data Setup Time
tDW
Data Setup before
WR
High
Data Hold Time
tDH
Data Hold after
WR High
OE to Data Valid
tRDD
RD Low to Data Valid
Address Access Time tAA
A0–A13,
xMS to Data Valid
xMS = PMS, DMS, BMS, CMS, IOMS.
FREQUENCY DEPENDENCY FOR TIMING
SPECIFICATIONS
tCK is defined as 0.5tCKI. The ADSP-2183 uses an input clock
with a frequency equal to half the instruction rate: a 16.67 MHz
input clock (which is equivalent to 60 ns) yields a 30 ns proces-
sor cycle (equivalent to 33 MHz). tCK values within the range of
0.5tCKI period should be substituted for all relevant timing pa-
rameters to obtain the specification value.
Example: tCKH = 0.5tCK – 7 ns = 0.5 (34.7 ns) – 7 ns = 10.35 ns
ABSOLUTE MAXIMUM RATINGS
*
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +4.6 V
Input Voltage . . . . . . . . . . . . . . . . . . . . . –0.5 V to VDD + 0.5 V
Output Voltage Swing . . . . . . . . . . . . . . –0.5 V to VDD + 0.5 V
Operating Temperature Range (Ambient) . . . . –40
°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . –65
°C to +150°C
Lead Temperature (5 sec) LQFP . . . . . . . . . . . . . . . . . +280
°C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. These are stress ratings only; functional operation of
the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
ESD SENSITIVITY
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the ADSP-2183 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE