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參數(shù)資料
| 型號： | L6372 |
| 英文描述： | OCTAL INDUSTRIAL INPUT INTERFACE(253.91 k) |
| 中文描述： | 八路工業(yè)輸入接口（253.91十一） |
| 文件頁數(shù)： | 6/15頁 |
| 文件大?。?/td> | 253K |
| 代理商： | L6372 |
EXTERNAL LINECHARACTERISTICS
The input characteristics of each of the eight
channels of the L6372 do not implement directly
the
input
characteristics
”IEC1131, 24VDC, type 2”, because the IEC
specification requires that the line receiver uses
at least a certain amount of power, that is, for
eight inputs, more than the maximum power that
a silicon IC in a package of reasonable dimen-
sionscan dissipate.
The solution adopted includesone or two external
resistors per every line receiver implemented.
One resistor is sufficient if no visual indication of
the line status is required. If a LED is included,
two resistors are sufficient, and in addition the
channel input protections of the L6372 also pro-
tect the LED.
Different input characteristic; of the line receiver
can be implemented according to the choice of
the values of
- R
1
(one per input)
- R
2
(if used, one per input)
- R
ref
(one per IC).
Different input characteristics may be chosen to
match the constraintsof:
- complying with the mask allowed for the in-
put characteristics by the IEC recommen-
dation (see figure 4);
- not exceeding the maximum allowed power
dissipation perline input (dependingon the
required
by
the
equipmentconstructionand characteristic);
- not exceedingthe maximum allowed power
dissipation per channel input in the IC (de-
pending upon the type of IC package –
DIP or SO – its heatsinkingcharacteristics
through the PCB, and the maximum ambi-
ent temperaturearound it).
a) Is the simplest possible case: no visual in-
dication of the line status is implemented;
the systemdissipation is the minimum pos-
sible, but the dissipation in the IC channel
is higher than in the cases b) and c).
b) Assumes that V
s
can be kept at 12V, and
made sink the excessline current from the
channel protection diodes when the input
lines are at their high level; the channel
dissipation can be kept to aminimum.
c) Allows a very low power dissipation, with
the LED and V
s
anywhere in the allowed
range. In all cases the IEC mask is re-
spected because the detection of the tran-
sition from ”low level received” to ”high
level received”, operated by the thresholds
V
2l
and V
2h
(see figure 5), takes place
when the line voltage is inside the area
from 5 to 11 V allowed by the IEC recom-
mendation.
Figure2:
ExternalChannelCircuits
R
ref
R
1
R
2
Vs
case a
case b
case c
12 K
±
2%
15 K
±
2%
18 K
±
2%
1.1K
±
5%
1.0K
±
5%
1.2K
±
5%
—
12 to 35V
11.6 to 12V
12 to 35V
2.0K
±
5%
680
±
5%
L6372
6/15
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6374 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:INDUSTRIAL QUAD LINE DRIVER |
| L6374_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Industrial quad line driver |
| L6374DP | 功能描述:緩沖器和線路驅(qū)動器 Industrial Quad Line RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| L6374FP | 功能描述:緩沖器和線路驅(qū)動器 Industrial Quad Line RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| L6374FP013TR | 功能描述:緩沖器和線路驅(qū)動器 Industrial Quad Line RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
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