參數(shù)資料
型號: ADSP-TS203SABP-X
廠商: ANALOG DEVICES INC
元件分類: 數(shù)字信號處理
英文描述: TigerSHARC Embedded Processor
中文描述: 32-BIT, OTHER DSP, PBGA576
封裝: 25 X 25 MM, MS-034, EBGA-576
文件頁數(shù): 33/40頁
文件大小: 609K
代理商: ADSP-TS203SABP-X
ADSP-TS203S
Preliminary Technical Data
Rev. PrB
|
Page 33 of 40
|
December 2003
TEST CONDITIONS
The ac signal specifications (timing parameters) appear
Table 22 on page 25
. These include output disable time, output
enable time, and capacitive loading. The timing specifications
for the DSP apply for the voltage reference levels in
Figure 31
.
Output Disable Time
Output pins are considered to be disabled when they stop driv-
ing, go into a high impedance state, and start to decay from their
output high or low voltage. The time for the voltage on the bus
to decay by
V is dependent on the capacitive load, C
L
and the
load current, I
L
. This decay time can be approximated by the fol-
lowing equation:
The output disable time t
DIS
is the difference between
t
MEASURED_DIS
and t
DECAY
as shown in
Figure 32
. The time
t
MEASURED_DIS
is the interval from when the reference signal
switches to when the output voltage decays
V
from the mea-
sured output high or output low voltage. t
DECAY
is calculated
with test loads
C
L
and
I
L
, and with
V equal to 0.4 V.
Figure 28. Typical Drive Currents at Strength5
Figure 29. Typical Drive Currents at Strength6
Figure 30. Typical Drive Currents at Strength7
OUTPUT PIN VOLTAGE – V
0
2.8
0.4
0.8
1.2
1.6
2.0
2.4
O
–20
–40
–60
–80
–100
0
20
V
DD_IO
= 2.375V, +85°C
–120
–140
–180
40
60
80
120
100
160
140
STRENGTH 5
V
DD_IO
= 2.5V, +25°C
PRELMNARY
V
DD_IO
= 2.625V, –40°C
I
OL
I
OH
V
DD_IO
= 2.375V, +85°C
V
DD_IO
= 2.5V, +25°C
V
DD_IO
= 2.625V, –40°C
–160
OUTPUT PIN VOLTAGE – V
0
2.8
0.4
0.8
1.2
1.6
2.0
2.4
O
–20
–40
–60
–80
–100
–120
–140
–160
–180
–200
0
20
V
DD_IO
= 2.375V, +85°C
–220
40
60
80
100
180
160
STRENGTH 6
V
DD_IO
= 2.5V, +25°C
PRELMNARY
V
DD_IO
= 2.625V, –40°C
I
OL
I
OH
V
DD_IO
= 2.375V, +85°C
V
DD_IO
= 2.5V, +25°C
V
DD_IO
= 2.625V, –40°C
120
140
OUTPUT PIN VOLTAGE – V
0
2.8
0.4
0.8
1.2
1.6
2.0
2.4
O
–20
–40
–60
–80
–100
–120
–140
–160
–180
–200
0
20
V
DD_IO
= 2.375V, +85°C
–220
40
60
80
100
220
200
STRENGTH 7
V
DD_IO
= 2.5V, +25°C
PRELMNARY
V
DD_IO
= 2.625V, –40°C
I
OL
I
OH
V
DD_IO
= 2.375V, +85°C
V
DD_IO
= 2.5V, +25°C
V
DD_IO
= 2.625V, –40°C
120
160
180
Figure 31. Voltage reference levels for AC measurements (except out-
put enable/disable)
Figure 32. Output Enable/Disable
INPUT
OR
OUTPUT
1.25V
1.25V
tDECAY
CLV
(
)
IL
=
REFERENCE
SIGNAL
t
DIS
OUTPUT STARTS
DRIVING
V
OH (MEASURED)
V
V
OL (MEASURED)
+
t
DECAY
V
t
MEASURED_DIS
V
OH (MEASURED)
V
OL (MEASURED)
1.65V
0.85V
HIGH-IMPEDANCE STATE.
TEST CONDITIONS CAUSE THIS
VOLTAGE TO BE APPROXIMATELY 1.25V
OUTPUT STOPS
DRIVING
t
ENA
t
MEASURED_ENA
t
RAMP
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