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DS55107J Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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DS55107J Datasheet(HTML) 6 Page - National Semiconductor (TI) |
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6 / 10 page  Typical Applications (Continued) swing is symmetrical about it for maximum noise margin The reference voltage should be in the range of b30V to a 30V It can be provided by a voltage supply or by a volt- age divider from an available supply voltage Unbalanced or Single-Line Systems TLF9446 – 4 Precautions in the Use of DS1603 DS3603 DS55107 DS75107 DS75108 and DS75208 Dual Line Receivers The following precaution should be observed when using or testing DS55107 DS75107 line circuits When only one receiver in a package is being used at least one of the differential inputs of the unused receiver should be terminated at some voltage between b30V and a30V preferably at ground Failure to do so will cause improper operation of the unit being used because of common bias circuitry for the current sources of the two receivers The DS55107 DS75107 and DS75108 line receivers fea- ture a common mode input voltage range of g30V This satisfies the requirements for all but the noisiest system ap- plications For these severe noise environments the com- mon mode range can be extended by the use of external input attenuators Common mode input voltages can in this way be reduced to g30V at the receiver input terminals Differential data signals will be reduced proportionately In- put sensitivity input impedance and delay times will be ad- versely affected The DS75108 line receivers feature an open-collector-out- put circuit that can be connected in the DOT-OR logic con- figuration with other DS75108 outputs This allows a level of logic to be implemented without addtional logic delay Increasing Common Mode Input Voltage Range of Receiver TLF9446 – 5 DS75108 Wired-OR Output Connections TLF9446 – 6 Circuit Differences Between ‘‘A’’ and Standard Devices The difference between the ‘‘A’’ and standard devices is shown in the following schematics of the input stage ‘‘A’’ Devices TLF9446 – 7 Standard Devices TLF9446 – 8 http www nationalcom 6 |
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