HCPL-261N Avago Technologies US Inc., HCPL-261N Datasheet - Page 17

• Manufacturer Part Number: HCPL-261N
• Description: OPTOCOUPLER, OPEN COLLECTOR, 3750VRMS
• Manufacturer: Avago Technologies US Inc.

Specifications of HCPL-261N

• No. Of Channels: 1
• Optocoupler Output Type: Logic Gate
• Input Current: 10mA
• Output Voltage: 7V
• Opto Case Style: DIP
• No. Of Pins: 8
• Propagation Delay Low-high: 100ns
• Isolation Voltage: 3.75kV
• Voltage - Isolation: 3750Vrms
• Number Of Channels: 1, Unidirectional
• Current - Output / Channel: 50mA
• Data Rate: 10MBd
• Propagation Delay High - Low @ If: 53ns @ 3.5mA
• Current - Dc Forward (if): 10mA
• Input Type: DC
• Output Type: Open Collector
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

V
V
Figure 26. Parallel data transmission example.
The figure shows data and clock signals at the inputs and
outputs of the optocouplers. 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 26 shows that there will be uncertainty
in both the data and the clock lines. It is important that
these two areas of uncertainty not overlap, otherwise
the clock signal might arrive before all of the data out-
puts have settled, or some of the data outputs may start
I
I
Figure 25. Illustration of propagation delay skew – t
OUTPUTS
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Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies Limited in the United States and other countries.
Data subject to change. Copyright © 2007 Avago Technologies Limited. All rights reserved. Obsoletes AV01-0561EN
AV02-0391 - December 6, 2007
F
F
O
O
INPUTS
CLOCK
CLOCK
DATA
DATA
50%
50%
HCPL-261A fig 24
1.5 V
t
PSK
HCPL-2602 fig 17
t
PSK
t
PSK
1.5 V
TPHL
TPLH
PSK
.
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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 applica-
tion is twice t
longer pulse width to ensure that any additional uncer-
tainty in the rest of the circuit does not cause a prob-
lem.
The t
guaranteed specifications for propagation delays, pulse-
width distortion, and propagation delay skew over the
recommended temperature, input current, and power
supply ranges.
PSK
specified optocouplers offer the advantages of
PSK
. A cautious design should use a slightly