HCPL-0661-000E Avago Technologies US Inc., HCPL-0661-000E Datasheet - Page 21
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HCPL-0661-000E
Manufacturer Part Number
HCPL-0661-000E
Description
OPTOCPLR LOG-OUT 2CH 10MBD 8SOIC
Manufacturer
Avago Technologies US Inc.
Datasheet
1.HCPL-0600-500E.pdf
(22 pages)
Specifications of HCPL-0661-000E
Package / Case
8-SOIC (0.154", 3.90mm Width)
Voltage - Isolation
3750Vrms
Number Of Channels
2, Unidirectional
Current - Output / Channel
50mA
Data Rate
10MBd
Propagation Delay High - Low @ If
50ns @ 7.5mA
Current - Dc Forward (if)
20mA
Input Type
DC
Output Type
Open Collector
Mounting Type
Surface Mount
Isolation Voltage
3750 Vrms
Maximum Continuous Output Current
50 mA
Maximum Fall Time
0.01 us
Maximum Forward Diode Current
15 mA
Minimum Forward Diode Voltage
1.4 V
Output Device
Logic Gate Photo IC
Configuration
2 Channel
Maximum Baud Rate
10 MBd(Typ)
Maximum Forward Diode Voltage
1.75 V
Maximum Reverse Diode Voltage
5 V
Maximum Power Dissipation
60 mW
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
No. Of Channels
2
Optocoupler Output Type
Logic Gate
Input Current
15mA
Output Voltage
7V
Opto Case Style
SOIC
No. Of Pins
8
Common Mode Ratio
10000
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
516-1533-5
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HCPL-0661-000E
Manufacturer:
AVAGO
Quantity:
40 000
Part Number:
HCPL-0661-000E
Manufacturer:
AVAGO/安华高
Quantity:
20 000
Propagation Delay, Pulse-Width Distortion and Propagation
Delay Skew
Propagation delay is a figure of merit which describes
how quickly a logic signal propagates through a sys-
tem. The propaga tion delay from low to high (t
amount of time required for an input signal to propagate
to the output, causing the output to change from low to
high. Similarly, the propagation delay from high to low
(t
to propagate to the output causing the output to change
from high to low (see Figure 8).
Pulse-width distortion (PWD) results when t
differ in value. PWD is defined as the difference be-
tween t
data rate capa bil ity of a transmission system. PWD can
be expressed in percent by dividing the PWD (in ns) by
the minimum pulse width (in ns) being transmitted. Typi-
cally, PWD on the order of 20-30% of the minimum pulse
width is tolerable; the exact figure depends on the par-
ticular application (RS232, RS422, T-l, etc.).
Propagation delay skew, t
consider in parallel data appli ca tions where synchroniza-
tion of signals on parallel data lines is a concern. If the
parallel data is being sent through a group of optocou-
plers, differ ences in propagation delays will cause the
data to arrive at the outputs of the optocouplers at differ-
ent times. If this difference in propagation delays is large
enough, it will determine the maximum rate at which
parallel data can be sent through the optocouplers.
Propagation delay skew is defined as the difference be-
tween the minimum and maximum propagation delays,
either t
which are operating under the same conditions (i.e., the
same drive current, supply voltage, output load, and op-
erating tempera ture). As illustrated in Figure 19, if the in-
21
Figure 19. Illustration of propagation delay skew - t
V
V
I
I
PHL
F
F
O
O
) is the amount of time required for the input signal
PLH
PLH
and t
or t
50%
50%
PHL
PHL
1.5 V
, for any given group of optocouplers
and often determines the maximum
t
PSK
PSK
, is an important parameter to
1.5 V
PSK
.
PLH
PLH
and t
) is the
PHL
puts of a group of optocouplers are switched either ON
or OFF at the same time, t
the shortest propagation delay, either t
longest propagation delay, either t
As mentioned earlier, t
parallel data transmission rate. Figure 20 is the timing
diagram of a typical parallel data application with both
the clock and the data lines being sent through opto-
couplers. 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 repre sents the uncertainty of
where an edge might be after being sent through an
opto coupler. Figure 20 shows that there will be uncer-
tainty in both the data and the clock lines. It is important
that these two areas of uncertainty not overlap, other-
wise 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 considera tions, the absolute minimum pulse width
that can be sent through optocouplers in a parallel appli-
cation is twice t
longer pulse width to ensure that any additional uncer-
tainty in the rest of the circuit does not cause a problem.
The t
guaranteed specifications for propagation delays, pulse-
width distortion and propagation delay skew over the
recom mended temper a ture, input current, and power
supply ranges.
OUTPUTS
Figure 20. Parallel data transmission example.
INPUTS
CLOCK
CLOCK
PSK
DATA
DATA
specified optocouplers offer the advantages of
PSK
t
PSK
. A cautious design should use a slightly
PSK
t
PSK
can determine the maximum
PSK
is the difference between
PLH
or t
PLH
PHL
or t
.
PHL
, and the