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參數(shù)資料
| 型號(hào)： | UT54LVDSC031-UPC |
| 英文描述： | Interface IC |
| 中文描述： | 接口IC |
| 文件頁(yè)數(shù)： | 5/11頁(yè) |
| 文件大?。?/td> | 78K |
| 代理商： | UT54LVDSC031-UPC |
3
Receiver Fail-Safe
The UT54LVDS032LV receiver is a high gain, high speed
device that amplifies a small differential signal (20mV) to TTL
logic levels. Due to the high gain and tight threshold of the
receiver, care should be taken to prevent noise from appearing
as a valid signal.
The receiver’s internal fail-safe circuitry is designed to source/
sink a small amount of current, providing fail-safe protection
(a stable known state of HIGH output voltage) for floating,
terminated or shorted receiver inputs.
1. Open Input Pins. The UT54LVDS032LV is a quad
receiver device, and if an application requires only 1, 2
or 3 receivers, the unused channel(s) inputs should be
left OPEN. Do not tie unused receiver inputs to ground
or any other voltages. The input is biased by internal
high value pull up and pull down resistors to set the
output to a HIGH state. This internal circuitry will
guarantee a HIGH, stable output state for open inputs.
2. Terminated Input. If the driver is disconnected (cable
unplugged), or if the driver is in a three-state or power-
off condition, the receiver output will again be in a
HIGH state, even with the end of cable 100
termination resistor across the input pins. The
unplugged cable can become a floating antenna which
can pick up noise. If the cable picks up more than 10mV
of differential noise, the receiver may see the noise as
a valid signal and switch. To insure that any noise is
seen as common-mode and not differential, a balanced
interconnect should be used. Twisted pair cable offers
better balance than flat ribbon cable.
3. Shorted Inputs. If a fault condition occurs that shorts
the receiver inputs together, thus resulting in a 0V
differential input voltage, the receiver output remains
in a HIGH state. Shorted input fail-safe is not supported
across the common-mode range of the device (V
SS to
2.4V). It is only supported with inputs shorted and no
external common-mode voltage applied.
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