ADSP-21990 datasheet(24/50 Pages) AD

24 / 50 page

Rev. A

Page 24 of 50

August 2007

ADSP-21990

ABSOLUTE MAXIMUM RATINGS

ESD CAUTION

TIMING SPECIFICATIONS

This section contains timing information for the DSP external

signals. Use the exact information given. Do not attempt to

derive parameters from the addition or subtraction of other

information. While addition or subtraction would yield mean-

ingful results for an individual device, the values given in this

data sheet reflect statistical variations and worst cases. Conse-

quently, parameters cannot be added meaningfully to derive

longer times.

Switching characteristics specify how the processor changes its

signals. No control is possible over this timing; circuitry exter-

nal to the processor must be designed for compatibility with

these signal characteristics. Switching characteristics indicate

what the processor will do in a given circumstance. Switching

characteristics can also be used 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.

Table 5. Absolute Maximum Ratings

Parameter

Rating

Internal (Core) Supply Voltage (VDDINT)

–0.3 V to +3.0 V

External (I/O) Supply Voltage (VDDEXT)

–0.3 V to +4.6 V

Input Voltage (VIL – VIH)

1, 2

–0.5 V to +5.5 V

Output Voltage Swing (VOL – VOH)

1, 2

–0.5 V to +5.5 V

Load Capacitance (CL)

200 pF

Core Clock Period (tCCLK)

6.25 ns

Core Clock Frequency (fCCLK)

160 MHz

Peripheral Clock Period (tHCLK)

12.5 ns

Peripheral Clock Frequency (fHCLK)

80 MHz

Storage Temperature Range (TSTORE)

–65 C to +150 C

Lead Temperature (5 Seconds) (TLEAD)

185 C

1 Stresses greater than those listed above may cause permanent damage to the device. These are

stress ratings only; functional operation of the device at these or any other conditions greater

than 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.

2 Except CLKIN and analog pins.

ESD (electrostatic discharge) sensitive device.

Charged devices and circuit boards can discharge

without detection. Although this product features

patented or proprietary circuitry, damage may occur

on devices subjected to high energy ESD. Therefore,

proper ESD precautions should be taken to avoid

performance degradation or loss of functionality.

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