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參數(shù)資料
| 型號(hào)： | HD26LS31 |
| 文件頁(yè)數(shù)： | 8/15頁(yè) |
| 文件大?。?/td> | 73K |
| 代理商： | HD26LS31 |
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HD26LS31
8
HD26LS31 Line Driver Applications
The HD26LS31 is a line driver that meets the EIA RS-422A conditions, and has been designed to supply a
high current for differential signals to a bus line. Its features are listed below.
Operates on a single 5 V power supply.
High output impedance when power is off
Three-state output
On-chip current limiter circuit
Sink current and source current both 40 mA
A block diagram is shown in figure 1. The enable function is common to all four drivers, and either active-
high or active-low can be selected.
The output section consists of two output stages (the Y side and Z side), each of which has the same sink
current and source current capacity.
Input is TTL compatible, and an output current limiter circuit is built into the output stage as shown in
figure 2.
1A
2A
3A
4A
Enable G
Enable G
1Y
1Z
2Y
2Z
3Y
3Z
4Y
4Z
Figure 1 HD26LS31 Block Diagram
The output current limiter circuit consists of transistor Q
1
and resistance R
1
, and operates when the voltage
drop on both sides of R
1
reaches approximately 0.7 V. At this time the current, i, is as follows:
i = 0.7 (V) / 9 (
)
≈
78 (mA)
When a current greater than this flows, Q
1
is turned on, the Q
2
base current flows to the output side, and the
flow of an excessively large output current is prevented.
However, since this type of current limiter circuit has the characteristics shown in figure 3, the output stage
power dissipation is large.
Therefore, when the output is shorted, this should be limited to a maximum of one second for one pin only.
The I
OL
vs. V
OL
characteristic for low-level output is shown in figure 4.
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| HD26LS32 | |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD26LS31FP(E) | 制造商:Renesas Electronics Corporation 功能描述: |
| HD26LS31P | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Quadruple Differential Line Drivers With 3 State Outputs |
| HD26LS31P(E) | 制造商:Renesas Electronics Corporation 功能描述: |
| HD26LS32 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Quadruple Differential Line Receivers With 3 State Outputs |
| HD26LS32A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
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