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參數資料
| 型號： | ADSP-21msp58 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | DSP Microcomputer(DSP 微計算機) |
| 中文描述： | 微機的DSP（數字信號處理器微計算機） |
| 文件頁數： | 37/40頁 |
| 文件大?。?/td> | 392K |
| 代理商： | ADSP-21MSP58 |
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ADSP-21msp58/59
REV. 0
–37–
Output Disable T ime
Output pins are considered to be disabled when they have
stopped driving and started a transition from the measured out-
put high or low voltage to a high impedance state. T he output
disable time (t
DIS
) is the difference of t
MEASURED
and t
DECAY
, as
shown in the Output Enable/Disable diagram. T he time is the
interval from when a reference signal reaches a high or low volt-
age level to when the output voltages have changed by 0.5 V
from the measured output high or low voltage. T he decay time,
t
DECAY
, is dependent on the capacitative load, C
L
, and the cur-
rent load,
i
L
, on the output pin. It can be approximated by the
following equation:
t
DECAY
=
C
L
· 0.5
V
i
L
from which
t
DIS
=
t
MEASURED
±
t
DECAY
is calculated. If multiple pins (such as the data bus) are dis-
abled, the measurement value is that of the last pin to stop
driving.
Output E nable T ime
Output pins are considered to be enabled when that have made
a transition from a high-impedance state to when they start driv-
ing. T he output enable time (t
ENA
) is the interval from when a
reference signal reaches a high or low voltage level to when the
output has reached a specified high or low trip point, as shown
in the Output Enable/Disable diagram. If multiple pins (such as
the data bus) are enabled, the measurement value is that of the
first pin to start driving.
t
MEASURED
t
DIS
t
ENA
V
(MEASURED)
REFERENCE
SIGNAL
V
OH
(MEASURED) –0.5V
V
OL
(MEASURED) +0.5V
t
DECAY
OUTPUT STOPS
DRIVING
V
OH
(MEASURED)
V
OL
(MEASURED)
OUTPUT
OUTPUT STARTS
HERE
HIGH-IMPEDANCE STATE. TEST CONDITIONS CAUSE
THIS VOLTAGE LEVEL TO BE APPROXIMATELY 1.5V.
V
(MEASURED)
2.0V
1.0V
Figure 31. Output Enable/Disable
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