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| 型号： | ACSL-6310-06TE |
| 元件分类： | 光电耦合器 |
| 英文描述： | 3 CHANNEL LOGIC OUTPUT OPTOCOUPLER, 15 Mbps |
| 封装： | ROHS COMPLIANT, SOP-16 |
| 文件页数： | 10/19页 |
| 文件大小： | 473K |
| 代理商： | ACSL-6310-06TE |
18
Propagation Delay, Pulse-Width Distortion and Propagation
Delay Skew
Propagation delay is a gure of merit which describes
how quickly a logic signal propagates through a
system. The propaga- tion delay from low to high
(t
PLH
) 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 (t
PHL
) is the amount of time required for the
input signal to propagate to the output causing the
output to change from high to low (see Figure 16).
Pulse-width distortion (PWD) results when t
PLH
and t
PHL
dier
in value. PWD is dened as the dierence between t
PLH
and
t
PHL
and often determines the maximum data 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 transmitted. Typically, PWD on the order of
20-30% of the minimum pulse width is tolerable; the exact
gure depends on the particular application (RS232, RS422,
T-l, etc.).
Propagation delay skew,t
PSK
, is an important parameter
to consider in parallel data applica- tions 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, dierences in propagation delays will cause
the data to arrive at the outputs of the optocouplers at
dierent times. If this dierence in propagation delays
is large enough, it will determine the maximum rate at
which parallel data can be sent through the optocou-
plers.
Propagation delay skew is defined as the difference
between the minimum and maximum propagation
delays,either t
PLH
or t
PHL
, for any given group of optocou-
plers which are operating under the same conditions (i.e.,
the same drive current, supply voltage, output load, and
operating temperature). As illustrated in Figure 23, if the
inputs of a group of optocouplers are switched either ON
or OFF at the same time, t
PSK
is the dierence between the
shortest propagation delay,either t
PLH
or tPHL, and the
longest propagation delay,either t
PLH
or t
PHL
.
As mentioned earlier,t
PSK
can determine the maximum
parallel data transmission rate. Figure 24 is the timing
diagram of a typical parallel data application with both
the clock and the data lines being sent through opto-
couplers. The gure 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 op-
tocoupler. Figure 24 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 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 t
PSK
. 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 t
PSK
specied optocouplers oer the advantages of
guaranteed specications for propagation delays, pulse-
width distortion and propagation delay skew over the
recommended temperature, input current, and power
supply ranges.
Figure 23. Propagation delay skew – t
PSK.
Figure 24. Parallel data transmission example.
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相关代理商/技术参数 |
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| ACSL-6310-50TE | 功能描述:高速光耦合器 3.0V - 5.5V 15MBd RoHS:否 制造商:Avago Technologies 电流传递比: 最大波特率: 最大正向二极管电压:1.75 V 最大反向二极管电压:5 V 最大功率耗散:40 mW 最大工作温度:+125 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-5 封装:Tube |
| ACSL-6310-56R | 制造商:AGILENT 制造商全称:AGILENT 功能描述:Multi-Channel and Bi-Directional, 15 MBd Digital Logic Gate Optocoupler |
| ACSL-6310-56T | 制造商:AGILENT 制造商全称:AGILENT 功能描述:Multi-Channel and Bi-Directional, 15 MBd Digital Logic Gate Optocoupler |
| ACSL-6310-56TE | 功能描述:高速光耦合器 3.0V - 5.5V 15MBd RoHS:否 制造商:Avago Technologies 电流传递比: 最大波特率: 最大正向二极管电压:1.75 V 最大反向二极管电压:5 V 最大功率耗散:40 mW 最大工作温度:+125 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-5 封装:Tube |
| ACSL-6400 | 制造商:AGILENT 制造商全称:AGILENT 功能描述:Multi-Channel and Bi-Directional, 15 MBd Digital Logic Gate Optocoupler |
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