PDSP16540 Datasheet, PDF (8/11 Pages) Zarlink Semiconductor Inc – 32K BUCKET BUFFER

PDSP16540
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.
ABSOLUTE MAXIMUM RATINGS [See Notes]
Test
Waveform - measurement level
Supply voltage Vcc
-0.5V to 7.0V
Delay from output
V_H
0.5V
Input voltage V_IN
-0.5V to Vcc + 0.5V
high to output
high impedance
Output voltage V
-0.5V to Vcc + 0.5V
OUT
Clamp diode current per pin I (see note 2)
18mA
K
Static discharge voltage (HMB)
500V
Delay from output
low to output
Storage temperature T_S
-65°C to 150°C
Ambient temperature with power applied T
high impedance
V_L
0.5V
AMB
0°C to 70°C
Junction temperature
Package power dissipation
Thermal resistances
150°C
3000mW
Delay from output
high impedance to
1.5V
0.5V
output low
Junction to case ø
JC
5°C/W
NOTES ON MAXIMUM RATINGS
Delay from output
high impedance to
output high
1.5V
0.5V
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.
VH - Voltage reached when output driven high
VL - Voltage reached when output driven low
STATIC ELECTRICAL CHARACTERISTICS
Operating Conditions (unless otherwise state)
Tamb = 0 C to +70°C.
Vcc = 5.0v ± 10%
Characteristic
Symbol
Value
Min. Typ. Max.
Units Conditions
Output high voltage
Output low voltage
Input high voltage
Input low voltage
Input leakage current
Input capacitance
Output leakage current
Output S/C current
V
OH
2.4
-
V I_OH = 4mA
V
OL
-
0.4
V I = -4mA
OL
V
IH
2.8
V
V_IL
-
0.8
V
I
IN
-10
+10
µA
GND < V < V
IN
CC
C_IN
10
pF
I
OZ
-50
+50
µA
GND < V < V
OUT
CC
I_SC
10
300
mA V = Max
CC
6