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參數(shù)資料
| 型號： | LXT386 |
| 廠商： | Intel Corp. |
| 英文描述： | QUAD T1/E1/J1 Transceiver |
| 中文描述： | 四T1/E1/J1收發(fā)器 |
| 文件頁數(shù)： | 28/78頁 |
| 文件大?。?/td> | 500K |
| 代理商： | LXT386 |
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LXT386
—
QUAD T1/E1/J1 Transceiver
28
Datasheet
A capacitor, charged via a measure of the driver output current and discharged by a measure of the
maximum allowable current, is used to detect a secondary short failure. Secondary shorted lines
draw excess current, overcharging the cap. When the capacitor charge deviates outside the nominal
charge window, a driver short circuit fail (DFM) is reported in the respective register by setting an
interrupt. During a long string of spaces, a short-induced overcharge eventually bleeds off, clearing
the DFM flag.
Note that unterminated lines of adequate length (
λ
/4) may effectively behave as short-circuits as
seen by the driver and therefore trigger the DFM. Under these circumstances, the alarm should be
disabled.
In addition, LXT386 features output driver short-circuit protection. When the output current
exceeds 100 mA, LXT386 limits the driver
’
s output voltage to avoid damage.
3.5
Line Protection
Figure 7 on page 29
shows recommended line interface circuitry. In the receive side, the 1 k
series resistors protect the receiver against current surges coupled into the device. Due to the high
receiver impedance (70 k
typical) the resistors do not affect the receiver sensitivity. In the
transmit side, the Schottky diodes D1-D4 protect the output driver.While not mandatory for normal
operation, these protection elements are strongly recommended to improve the design robustness.
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