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DS36C200IMA Datasheet(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DS36C200IMA
Description  Dual High Speed Bi-Directional Differential Transceiver
Download  11 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DS36C200IMA Datasheet(HTML) 8 Page - National Semiconductor (TI)

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Application Information (Continued)
existing RS-422 drivers.
Fail-safe Feature:
The LVDS receiver is a high gain, high speed device that
amplifies a small differential signal (20mV) to CMOS logic
levels. Due to the high gain and tight threshold of the re-
ceiver, 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 DS36C200I is a dual transceiver
device, and if an application requires only one receiver,
the unused channel inputs should be left OPEN. Do not
tie the receiver inputs to ground or any other voltages.
The input is biased by internal high value pull up or 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 TRI-STATE or power-
off condition, the receiver output will again be in a HIGH
state, even with the end of the cable 100
Ω 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 will offer better bal-
ance than flat ribbon cable.
3.
Shorted Inputs. If a fault condition occurs that shorts
the receiver inputs together, thus resulting in a 0V differ-
ential input voltage, the receiver output will remain in a
HIGH state. Shorted input fail-safe is not supported
across the common-mode range of the device (GND to
2.4V). It is only supported with inputs shorted and no
external common-mode voltage applied.
If there is more than 10mV of differential noise, the receiver
may switch or oscillate. If this condition can happen in your
application, you may wish to add external fail-safe resistors
to create a larger noise margin. External lower value pull up
and pull down resistors (for a stronger bias) may be used to
boost fail-safe in the presence of higher noise levels. The
pull up and pull down resistors should be in the 5k
Ω to 15kΩ
range to minimize loading and waveform distortion to the
driver. The common-mode bias point should be set to ap-
proximately 1.2V (less than 1.75V) to be compatible with the
internal circuitry.
Additional information on fail-safe biasing of LVDS devices
may be found in AN-1194.
20077614
FIGURE 10. (A) Dedicated IEEE 1394 Link
(B) Full IEEE 1394 Compliant Link
www.national.com
8


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