ADSP-2181

–13–

REV. D

ESD SENSITIVITY

The ADSP-2181 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-2181 features proprietary ESD protection circuitry to dissipate high energy discharges

(Human Body Model). Per method 3015 of MIL-STD-883, the ADSP-2181 has been classified as

a Class 1 device.

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.

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-2181 timing parameters, for your

convenience.

Memory

ADSP-2181 Timing

Device

Timing

Parameter

Specification

Parameter

Definition

Address Setup to

A0–A13,

xMS Setup before

Write Start

WR Low

Address Setup to

A0–A13,

xMS Setup before

Write End

WR Deasserted

Address Hold Time

A0–A13,

xMS Hold after

WR Deasserted

Data Setup Time

Data Setup before

WR

High

Data Hold Time

Data Hold after

WR High

OE to Data Valid

RD Low to Data Valid

A0–A13,

xMS to Data Valid

xMS = PMS, DMS, BMS, CMS, IOMS.

FREQUENCY DEPENDENCY FOR TIMING

SPECIFICATIONS

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-

rameters to obtain the specification value.

ABSOLUTE MAXIMUM RATINGS

*

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V

Operating Temperature Range (Ambient) . . . . –40

°C to +85°C

Storage Temperature Range . . . . . . . . . . . . . –65

°C to +150°C

Lead Temperature (5 sec) TQFP . . . . . . . . . . . . . . . . +280

°C

Lead Temperature (5 sec) PQFP . . . . . . . . . . . . . . . . . +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.

WARNING!

ESD SENSITIVE DEVICE