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ACPL-K73L-000E View Datasheet(PDF) - Avago Technologies

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ACPL-K73L-000E Datasheet PDF : 14 Pages
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IF
1
2
GND1 3
6
VDD
IF1 1
8
C
GND 1 2
7
5
Vo
GND 1 3
6
4 GND2
IF2 4
5
ACPL-W70L
ACPL-K73L
C=0.01µF to 0.1µF
Figure 8. Recommended printed circuit board layout
VDD
C
VO1
VO2
GND 2
VI
50%
VO
2.5 V,
CMOS
tPSK
DATA
INPUTS
CLOCK
VI
50%
VO
2.5 V,
CMOS
Figure 9. Propagation delay skew waveform
DATA
OUTPUTS
tPSK
CLOCK
tPSK
Figure 10. Parallel data transmission example.
time, tPSK is the difference between the shortest propaga-
tion delay, either tPHL or tPHL, and the longest propagation
delay, either tPHL or tPHL. As mentioned earlier, tPSK can de-
termine the maximum parallel data transmission rate.
Figure 10 is the timing diagram of a typical parallel data
application with both the clock and the data lines being
sent through optocouplers. The figure shows data and
clock signals at the inputs and outputs of the optocou-
plers. To obtain the maximum data transmission rate, both
edges of the clock signal are being used to clock the data;
if only one edge were used, the clock signal would need
to be twice as fast.
Propagation delay skew represents the uncertainty of
where an edge might be after being sent through an op-
tocoupler.
Figure 10 shows that there will be uncertainty in both the
data and the clock lines. It is important that these two ar-
eas of uncertainty not overlap, otherwise the clock signal
might arrive before all of the data outputs have settled, or
some of the data outputs may start to change before the
clock signal has arrived.
From these considerations, the absolute minimum pulse
width that can be sent through optocouplers in a parallel
application is twice tPSK. A cautious design should use a
slightly longer pulse width to ensure that any additional
uncertainty in the rest of the circuit does not cause a
problem.
The tPSK specified optocouplers offer the advantages of
guaranteed specifications for propagation delays, pulse-
width distortion and propagation delay skew over the rec-
ommended temperature, and power supply ranges.
10
 

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