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參數資料
| 型號： | ADSP-2173 |
| 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： | 44/52頁 |
| 文件大小： | 685K |
| 代理商： | ADSP-2173 |
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REV. A
–44–
ADSP-2171/ADSP-2172/ADSP-2173
ADSP-2173
CAPACIT IVE LOADING
Figures 35 and 36 show the capacitive loading characteristics of
the ADSP-2173.
16
8
25
12
28
20
24
150
125
100
75
50
V
DD
= 3.3 V
C
L
– pF
R
Figure 35. Typical Output Rise Time vs. Load Capacitance,
C
L
(at Maximum Ambient Operating Temperature)
NOMINAL
-2
25
+4
+2
+8
+10
+12
150
125
100
75
50
+14
V
C
L
– pF
Figure 36. 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.
INPUT
OUTPUT
V
DD
2
V
DD
2
Figure 37. 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 38. Output Enable/Disable
TO
OUTPUT
PIN
50pF
I
OH
I
OL
V
DD
2
Figure 39. Equivalent Device Loading for AC Measure-
ments (Including All Fixtures)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADSP-2173BS-80 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADSP-2173BST-80 | 制造商:Analog Devices 功能描述:DSP Fixed-Point 16-Bit 20MHz 20MIPS 128-Pin TQFP 制造商:Rochester Electronics LLC 功能描述:16BIT FXD PT PROC 3.3V - Bulk |
| ADSP-2176-760040 | 制造商:Analog Devices 功能描述: |
| ADSP-2176-760061 | 制造商:Analog Devices 功能描述: |
| ADSP-2176-760243 | 制造商:Analog Devices 功能描述: |
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