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參數(shù)資料
| 型號(hào)： | HCPL-261A |
| 英文描述： | HCMOS Compatible, High CMR, 10 MBd Optocouplers |
| 中文描述： | HCMOS兼容，高CMR，10 MBd的光電耦合器 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大小： | 252K |
| 代理商： | HCPL-261A |
1-180
Figure 24. CMOS Gate Drive Circuit for HCPL-261A/-
261N Families.
Table 1. Effects of Common Mode Pulse Direction on Transient I
LED
If |I
LP
| < |I
LN
|,
LED I
F
Current
Is Momentarily:
increased
If |I
LP
| > |I
LN
|,
LED I
F
Current
Is Momentarily:
decreased
If dV
CM
/dt Is:
positive (>0)
then I
LP
Flows:
away from LED
anode through C
LA
toward LED
anode through C
LA
and I
LN
Flows:
away from LED
cathode through C
LC
toward LED
cathode through C
LC
negative (<0)
decreased
increased
Figure 23. TTL Open-Collector/Open Drain Gate Drive Circuit
for HCPL-261A/-261N Families.
820
1
3
2
4
V
CC
74HC00
(OR ANY
OPEN-COLLECTOR/
OPEN-DRAIN
LOGIC GATE)
HCPL-261X
LED
750
1
3
2
4
V
CC
74HC04
(OR ANY
TOTEM-POLE
OUTPUT LOGIC
GATE)
HCPL-261A/261N
1N4148
LED
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 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 9).
Pulse-width distortion (PWD)
results when t
PLH
and t
PHL
differ
in value. PWD is defined as the
difference 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 figure
depends on the particular appli-
cation (RS232, RS422, T-1, etc.).
Propagation delay skew, t
PSK
, is
an important parameter to con-
sider in parallel data applications
where synchronization of signals
on parallel data lines is a con-
cern. If the parallel data is being
sent through a group of opto-
couplers, differences in propaga-
tion delays will cause the data to
arrive at the outputs of the opto-
couplers at different 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.
Propagation delay skew is defined
as the difference between the
minimum and maximum propaga-
tion delays, either t
PLH
or t
PHL
, for
any given group of optocouplers
which are operating under the
same conditions (i.e., the same
drive current, supply voltage,
output load, and operating
temperature). As illustrated in
Figure 25, if the inputs of a group
of optocouplers are switched
either ON or OFF at the same
time, t
PSK
is the difference
between the shortest propagation
delay, either t
PLH
or t
PHL
, and the
longest propagation delay, either
t
PLH
or t
PHL
.
As mentioned earlier, t
PSK
can
determine the maximum parallel
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HCPL-261N | High CMR, High Speed TTL Compatible Optocouplers |
| HCPL-2630 | High CMR, High Speed TTL Compatible Optocouplers |
| HCPL-2631 | High CMR, High Speed TTL Compatible Optocouplers |
| HCPL-263A | High CMR, High Speed TTL Compatible Optocouplers |
| HCPL-263N | High CMR, High Speed TTL Compatible Optocouplers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HCPL-261A#020 | 功能描述:高速光耦合器 10MBd 1Ch 3mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube |
| HCPL-261A#060 | 功能描述:高速光耦合器 10MBd 1Ch 3mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube |
| HCPL-261A#300 | 功能描述:高速光耦合器 10MBd 1Ch 3mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube |
| HCPL-261A#500 | 功能描述:高速光耦合器 10MBd 1Ch 3mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube |
| HCPL-261A#560 | 功能描述:高速光耦合器 10MBd 1Ch 3mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube |
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