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HCPL-0738 データシート(PDF) 7 Page - AVAGO TECHNOLOGIES LIMITED

部品番号 HCPL-0738
部品情報  High Speed CMOS Optocoupler
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メーカー  AVAGO [AVAGO TECHNOLOGIES LIMITED]
ホームページ  http://www.avagotech.com
Logo AVAGO - AVAGO TECHNOLOGIES LIMITED

HCPL-0738 データシート(HTML) 7 Page - AVAGO TECHNOLOGIES LIMITED

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7
Propagation Delay, Pulse-Width
Distortion, and Propagation Delay Skew
Propagationdelayisafigureofmeritwhichdescribeshow
quickly a logic signal propagates through a system. The
propagation delay from low to high (tPLH) is the 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
(tPHL) is the amount of time required for the in-
put signal to propagate to the output, causing the
output to change from high to low (see Figure 7).
Pulse-width distortion (PWD) results when tPLH and
tPHL differ in value. PWD is defined as the difference
between tPLH and tPHL and often determines the maxi-
mum data rate capability of a transmission system. PWD
Figure 6. Recommended printed circuit board layout.
Application Information
Bypassing and PC Board Layout
The HCPL-0738 optocoupler is extremely easy to use. No
external interface circuitry is required because the HCPL-
0738useshigh-speedCMOSICtechnologyallowingCMOS
logic to be connected directly to the inputs and outputs.
can be expressed in percent by dividing the PWD (in ns)
by the minimum pulse width (in ns) being transmitted.
Typically, PWD on the order of 20-30% of the minimum
pulse width is tolerable; the exact figure depends on
the particular application (RS232, RS422, T-1, etc.).
Propagation delay skew, tPSK, is an important parameter
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 op-
tocouplers, differences in propagation delays will cause
the data to arrive at the outputs of the optocouplers at
different 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.
AsshowninFigure6,theonlyexternalcomponentrequired
forproperoperationisthebypasscapacitor.Capacitorvalues
should be between 0.01 µF and 0.1 µF. For each capacitor,
the total lead length between both ends of the capacitor
and the power-supply pins should not exceed 20 mm.
7
5
6
8
2
3
4
1
GND 2
C
VDD
GND 1
VO 2
VO 1
IF1
GND 1
IF2


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