adsp-21msp58 Analog Devices, Inc., adsp-21msp58 Datasheet - Page 22

• Manufacturer Part Number: adsp-21msp58
• Description: Dsp Microcomputers
• Manufacturer: Analog Devices, Inc.

ADSP-21msp58/59
TIMING PARAMETERS
GENERAL NOTES
Use the exact timing information given. Do not attempt to de-
rive parameters from the addition or subtraction of others. While
addition or subtraction would yield meaningful results for an in-
dividual device, the values given in this data sheet reflect statisti-
cal 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; it is dependent on
the internal design. Timing requirements apply to signals that
are controlled outside the processor, such as the data input for a
read operation.
Timing requirements guarantee that the processor operates cor-
rectly with another device. Switching characteristics tell you
what the device will do under a given circumstance. Also, use the
switching characteristics to ensure any timing requirement of a
device connected to the processor (such as memory) is satisfied.
ESD SENSITIVITY
The ADSP-21msp58/59 is an ESD (electrostatic discharge) sensitive device. Electrostatic charges
readily accumulate on the human body and equipment and can discharge without detection.
Permanent damage may occur to devices subjected to high energy electrostatic discharges.
The ADSP-21msp58/59 features proprietary ESD protection circuitry to dissipate high energy
discharges (Human Body Model).
Proper ESD precautions are recommended to avoid performance degradation or loss of function-
ality. Unused devices must be stored in conductive foam or shunts, and the foam should be
discharged to the destination before devices are removed.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
Input Voltage . . . . . . . . . . . . . . . . . . . . . –0.3 V to V
Output Voltage Swing . . . . . . . . . . . . . . –0.3 V to V
Operating Temperature Range (Ambient) . . . . –40 C to +85 C
Storage Temperature Range . . . . . . . . . . . . . –65 C to +150 C
Lead Temperature (5 sec) . . . . . . . . . . . . . . . . . . . . . . +280 C
*
Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. These are stress ratings only, and 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.
–22–
MEMORY REQUIREMENTS
This chart links common memory device specification
names and ADSP-21msp58/59 timing parameters for your
convenience.
Parameter
Name
t
t
t
t
t
t
t
ASW
AW
WRA
DW
DH
RDD
AA
*
Function
A0-A13, DMS, PMS
Setup before WR Low
A0-A13, DMS, PMS Setup Address Setup
before WR Deasserted
A0-A13, DMS, PMS
Hold after WR Deasserted
Data Setup before WR High Data Setup Time
Data Hold after WR High
RD Low to Data Valid
A0-A13, DMS, PMS,
BMS to Data Valid
DD
DD
+ 0.3 V
+ 0.3 V
WARNING!
Common
Memory Device
Specification Name
Address Setup to
Write Start
to Write End
Address Hold Time
Data Hold Time
OE to Data Valid
Address Access Time
ESD SENSITIVE DEVICE
REV. 0