參數(shù)資料
型號(hào): ISO508P-U
英文描述: Uni-Directional ISOLATED DIGITAL COUPLERS
中文描述: 單向隔離數(shù)字耦合器
文件頁(yè)數(shù): 5/6頁(yè)
文件大?。?/td> 187K
代理商: ISO508P-U
5
ISO508
DATA CORRUPTION
In either synchronous or asynchronous mode if the data is
upset by a transient the complete transmission is invalid.
However, in asynchronous mode the data is being sent
continuously and will therefore correct the corrupted infor-
mation within a maximum of 1
μ
s. In synchronous mode,
data transfer is under the control of the user, and retransmis-
sion would be required by the software.
DATA TRANSMISSION AND JITTER
Because the internal 20MHz clock is free-running, two
“jitter” conditions are possible. In synchronous mode when
LEI goes low data will be transmitted (clocked) across the
barrier. Depending on when LEI goes low, in relation to the
internal clock cycle, will determine the “jitter” between
successive input data transfers. This can be maximum of
50ns.
In asynchronous mode the input data is transferred by the
internal clock and logic control, i.e., 2 sync. Clock cycles.,
(S
0
, and S
1
), 8 data clock cycles. Depending on when the
input data is presented, in relation to the start of the data
block transmission, will determine the “jitter” between suc-
cessive input data transfers. This can be maximum of 500ns.
FIGURE 4. Data Corruption.
FIGURE 5. Jitter in Synchronous Mode.
FIGURE 6. Jitter in Asynchronous Mode.
FIGURE 7. Timing Diagrams.
INPUT DATA
LEI
INT. CLK
“JITTER”
INPUT
DATA
LEI
INT. CLK
“JITTER”
2
1
0
S
1
S
0
7
6
5
4
3
2
1
LEO
DATA OUT
OE
t
DD
t
EN
t
DIS
t
WH
LEI
DATA IN
DATA OUT
t
H
t
WL
t
PD(sync)
DATA IN
DATA OUT
t
PD(sync)
t
SU
n–1
INPUT DATA
LEI
BARRIER
LEO
DATA n+1
DATA n+2
DATA n
OUTPUT DATA
DATA n–1
Invalid
DATA n+1
ACTIVE
ACTIVE
ACTIVE
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