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DS90LV047A Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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DS90LV047A Datasheet(HTML) 7 Page - National Semiconductor (TI) |
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7 / 13 page  Typical Application (Continued) 1. Open Input Pins. The DS90LV048A 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 DS90LV047A driver is discon- nected (cable unplugged), or if the DS90LV047A 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 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 balance 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. 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 approximately 1.2V (less than 1.75V) to be compatible with the internal circuitry. Pin Descriptions Pin No. Name Description 2, 3, 6, 7 D IN Driver input pin, TTL/CMOS compatible 10, 11, 14, 15 D OUT+ Non-inverting driver output pin, LVDS levels 9, 12, 13, 16 D OUT− Inverting driver output pin, LVDS levels 1 EN Driver enable pin: When EN is low, the driver is disabled. When EN is high and EN* is low or open, the driver is enabled. If both EN and EN* are open circuit, then the driver is disabled. Pin No. Name Description 8EN* Driver enable pin: When EN* is high, the driver is disabled. When EN* is low or open and EN is high, the driver is enabled. If both EN and EN* are open circuit, then the driver is disabled. 4V CC Power supply pin, +3.3V ± 0.3V 5 GND Ground pin Ordering Information Operating Package Type/ Order Number Temperature Number −40˚C to +85˚C SOP/M16A DS90LV047ATM −40˚C to +85˚C TSSOP/MTC16 DS90LV047ATMTC 10088709 FIGURE 7. Driver Output Levels www.national.com 7 |
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