參數(shù)資料
型號: ADSP-21060LC
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(shù)字信號處理器微計算機)
文件頁數(shù): 40/48頁
文件大?。?/td> 515K
代理商: ADSP-21060LC
–40–
ADSP-21060C/ADSP-21060LC
REV. PrA
PRELIMINARY
DATA
TECHNICAL
E xample System Hold T ime Calculation
T o determine the data output hold time in a particular system,
first calculate t
DECAY
using the equation given above. Choose
V
to be the difference between the ADSP-2106x’s output voltage
and the input threshold for the device requiring the hold time. A
typical
V will be 0.4 V. C
L
is the total bus capacitance (per
data line), and I
L
is the total leakage or three-state current (per
data line). T he hold time will be t
DECAY
plus the minimum
disable time (i.e., t
DAT RWH
for the write cycle).
REFERENCE
SIGNAL
t
DIS
OUTPUT STARTS
DRIVING
V
OH (MEASURED)
D
V
V
OL (MEASURED)
+
D
V
t
DECAY
t
MEASURED
V
OH (MEASURED)
V
OL (MEASURED)
2.0V
1.0V
V
OH (MEASURED)
HIGH-IMPEDANCE STATE.
TEST CONDITIONS CAUSE
THIS VOLTAGE TO BE
APPROXIMATELY 1.5V
OUTPUT STOPS
DRIVING
t
ENA
Figure 25. Output Enable/Disable
+1.5V
50pF
TO
OUTPUT
PIN
I
OL
I
OH
Figure 26. Equivalent Device Loading for AC Measure-
ments (Includes All Fixtures)
1.5V
1.5V
Figure 27. Voltage Reference Levels for AC Measure-
ments (Except Output Enable/Disable)
Capacitive Loading
Output delays and holds are based on standard capacitive loads:
50 pF on all pins (see Figure 26). T he delay and hold specifica-
tions given should be derated by a factor of 1.5 ns/50 pF for
loads other than the nominal value of 50 pF. Figures 29–30,
33–34 show how output rise time varies with capacitance. Fig-
ures 31, 35 show graphically how output delays and holds vary
with load capacitance. (Note that this graph or derating does
not apply to output disable delays; see the previous section
Output Disable Time
under T est Conditions.) T he graphs of
Figures 29, 30 and 31 may not be linear outside the ranges
shown.
相關PDF資料
PDF描述
ADSP-21060C DSP Microcomputer(DSP 微計算機)
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ADSP-21261SKBC-150 SHARC Embedded Processor
ADSP-21261SKBCZ150 SHARC Embedded Processor
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