參數(shù)資料
型號(hào)： ADSP-2173
廠商： Analog Devices, Inc.
英文描述： DSP Microcomputer(DSP 微計(jì)算機(jī))
中文描述： 微機(jī)的DSP（數(shù)字信號(hào)處理器微計(jì)算機(jī)）
文件頁(yè)數(shù)： 30/52頁(yè)
文件大小： 685K
代理商： ADSP-2173
REV. A
–30–
ADSP-2171/ADSP-2172/ADSP-2173
ADSP-2171/ADSP-2172
CAPACIT IVE LOADING
Figures 19 and 20 show the capacitive loading characteristics of
the ADSP-2171/ADSP-2172.
R
28
12
4
8
24
16
20
25
150
125
100
75
50
C
L
– pF
V
DD
= 4.5V
Figure 19. Typical Output Rise Time vs. Load Capacitance,
C
L
(at Maximum Ambient Operating Temperature)
+14
+4
–2
+2
+12
+8
+10
25
150
125
100
75
50
C
L
– pF
NOMINAL
V
Figure 20. Typical Output Valid Delay or Hold vs. Load
Capacitance, C
L
(at Maximum Ambient Operating
Temperature)
T E ST CONDIT IONS
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.
3.0V
1.5V
0.0V
2.0V
1.5V
0.3V
INPUT
OUTPUT
Figure 21. Voltage Reference Levels for AC Measure-
ments (Except Output Enable/Disable)
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.
2.0V
1.0V
t
ENA
REFERENCE
SIGNAL
OUTPUT
t
DECAY
V
OH
(MEASURED)
OUTPUT STOPS
DRIVING
OUTPUT STARTS
DRIVING
t
DIS
t
MEASURED
V
OL
(MEASURED)
V
OH
(MEASURED) – 0.5V
V
OL
(MEASURED) +0.5V
HIGH-IMPEDANCE STATE. TEST CONDITIONS CAUSE
THIS VOLTAGE LEVEL TO BE APPROXIMATELY 1.5V.
V
OH
(MEASURED)
V
OL
(MEASURED)
Figure 22. Output Enable/Disable
TO
OUTPUT
PIN
50pF
+1.5V
I
OH
I
OL
Figure 23. Equivalent Device Loading for AC Measure-
ments (Including All Fixtures)
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