HCPL-0721-560E Avago Technologies US Inc., HCPL-0721-560E Datasheet - Page 12
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HCPL-0721-560E
Manufacturer Part Number
HCPL-0721-560E
Description
OPTOCOUPLER 25MBD 6NS VDE 8-SOIC
Manufacturer
Avago Technologies US Inc.
Datasheet
1.HCPL-0720-000E.pdf
(19 pages)
Specifications of HCPL-0721-560E
Voltage - Isolation
3750Vrms
Number Of Channels
1, Unidirectional
Current - Output / Channel
10mA
Data Rate
25MBd
Propagation Delay High - Low @ If
20ns
Input Type
Logic
Output Type
Push-Pull, Totem-Pole
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
No. Of Channels
1
Optocoupler Output Type
Gate Drive
Input Current
10µA
Output Voltage
5V
Opto Case Style
SOIC
No. Of Pins
8
Peak Reflow Compatible (260 C)
Yes
Isolation Voltage
3.75kV
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HCPL-0721-560E
Manufacturer:
AVAGO
Quantity:
30 000
Pulse-width distortion (PWD) is the difference between
t
rate capability of a transmission system. PWD can be
expressed in percent by dividing the PWD (in ns) by the
minimum pulse width (in ns) being trans mitted. Typical-
ly, PWD on the order of 20 - 30% of the minimum pulse
width is tolerable.
Propagation delay skew, t
to con sider in parallel data applications where synchro-
nization of signals on parallel data lines is a concern. If
the parallel data is being sent through a group of opto-
couplers, differences in propagation delays will cause the
data to arrive at the outputs of the optocouplers at differ-
ent times. If this difference in propagation delay is large
enough it will determine the maximum rate at which
parallel data can be sent through the optocouplers.
Figure 13. Propagation delay skew waveform.
12
Propagation delay skew repre sents the uncertainty of
where an edge might be after being sent through an op-
tocoupler. Figure 14 shows that there will be uncertainty
in both the data and clock lines. It is important that these
two areas 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 consider-
ations, the absolute minimum pulse width that can be sent
through optocouplers in a parallel application is twice t
PHL
V
V
and t
V
V
O
O
I
I
PLH
and often determines the maxi mum data
50%
50%
CMOS
2.5 V,
PSK
t
PSK
, is an important parameter
2.5 V,
CMOS
PSK
.
Propagation delay skew is defined as the difference be-
tween the minimum and maximum propa gation delays,
either t
which are operating under the same conditions (i.e., the
same drive current, supply volt age, output load, and op-
erating temperature). As illustrated in Figure 13, if the in-
puts of a group of optocouplers are switched either ON
or OFF at the same time, t
the shortest propagation delay, either t
the longest propagation delay, either t
As mentioned earlier, t
parallel data transmission rate. Figure 14 is the timing
diagram of a typical parallel data application with both
the clock and data lines being sent through the opto-
couplers. The figure shows data and clock signals at the
inputs and outputs of the optocouplers. In this case the
data is assumed to be clocked off of the rising edge of
the clock.
Figure 14. Parallel data transmission example.
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 HCPL-772X/072X optocouplers offer the advantage
of guaranteed specifications for propagation delays,
pulse-width distortion, and propagation delay skew
over the recommended temperature and power supply
ranges.
INPUTS
OUTPUTS
CLOCK
CLOCK
DATA
DATA
PLH
or t
PHL
t
PSK
, for any given group of optocoup lers
PSK
t
PSK
can determine the maximum
PSK
is the difference between
PLH
PLH
or t
or t
PHL
.
PHL
, and