PDSP16540

6

STATIC ELECTRICAL CHARACTERISTICS

Operating Conditions (unless otherwise state)

Tamb = 0 C to +70

°C.

Vcc = 5.0v

± 10%

ABSOLUTE MAXIMUM RATINGS [See Notes]

Supply voltage Vcc

-0.5V to 7.0V

Input voltage V

IN

-0.5V to Vcc + 0.5V

Output voltage V

OUT

-0.5V to Vcc + 0.5V

Clamp diode current per pin I

18mA

Static discharge voltage (HMB)

500V

Storage temperature T

S

-65

°C to 150°C

Ambient temperature with power applied T

AMB

0

°C to 70°C

Junction temperature

150

°C

Package power dissipation

3000mW

Thermal resistances

Junction to case ø

JC

5

°C/W

NOTES ON MAXIMUM RATINGS

1. Exceeding these ratings may cause permanent damage.

Functional operation under these conditions is not implied.

2. Maximum dissipation or 1 second should not be exceeded,

only one output to be tested at any one time.

3. Exposure to absolute maximum ratings for extended

periods may affect device reliablity.

4. Current is defined as positive into the device.

Delay from output

high to output

high impedance

Test

Waveform - measurement level

Delay from output

low to output

high impedance

H

V

0.5V

V

0.5V

L

1.5V

0.5V

1.5V

0.5V

Delay from output

high impedance to

output low

Delay from output

high impedance to

output high

V

- Voltage reached when output driven high

V

- Voltage reached when output driven low

H

L

The amount of overlapping is dependent on the needs of

a particular application, and is usually subject to some com-

promise. If the above maximum writing rates are marginally

not adequate, the amount of overlap can possibly be reduced

to achieve the required performance. Mode control inputs

MD2:1 should then all be tied high, and outputs D9:5 used as

inputs during reset to define the number of new words to be

written.

SUPPORTING REAL ONLY TRANSFORMS

If MD5 is tied high the PDSP16540 will support the

PDSP16510 when two concurrent 1024 point real transa-

forms are to be performed. It does not suppoprt block overlap-

ping in this mode.

Real only data is written to the buffer using the IP15:0

inputs, and the IP31:16 inputs are redundant. Two blocks of

data are acquired before DAV goes active, and both blocks are

then read in parallel using all thirty two outputs.

MD0,1, and 2 must be tied low in order to define blocks of

1024 words which totally consist of new data. The RMF flag is

not needed by the PDSP16510, but will actually go active after

the defined number of words in the second block have been

loaded. Control Register Bits 8:6 in the PDSP16510 must be

set to 101 in order to expect data on both its real and imaginary

inputs.

Units

V

V

V

V

µA

pF

µA

mA

Symbol

V

OH

V

OL

V

IH

V

IL

I

IN

C

IN

I

OZ

I

SC

Min.

2.4

-

2.8

-

-10

-50

10

Value

Typ.

10

Max.

-

0.4

0.8

+10

+50

300

Conditions

I

I

GND < V

GND < V

V

Characteristic

Output high voltage

Output low voltage

Input high voltage

Input low voltage

Input leakage current

Input capacitance

Output leakage current

Output S/C current