DS55107 Datasheet, PDF (7/10 Pages) National Semiconductor (TI) – Dual Line Receivers

Typical Applications (Continued)
The input protection diodes are useful in certain party-line
systems which may have multiple Va power supplies and
in which case may be operated with some of the Va sup-
plies turned off In such a system if a supply is turned off
and allowed to go to ground the equivalent input circuit
connected to that supply would be as follows
‘‘A’’ Devices
This would be a problem in specific systems which might
possibly have the transmission lines biased to some poten-
tial greater than 1 4V Since this is not a widespread appli-
cation problem both the ‘‘A’’ and standard devices will be
available The ratings and characteristic specifications of
the ‘‘A’’ devices are the same as those of the standard
devices
The DS55107A feature the ‘‘A’’ device input stage
Standard Devices
TL F 9446 – 9
Schematic Diagrams
TL F 9446 – 10
DS55107 DS75107 DS75108 DS75208
Note 1 of the dual circuit is shown
Note 2 Indicates connections common to second half of dual circuit
Note 3 Components shown with dash lines are applicable to the DS55107 DS75207 and DS75107 only
TL F 9446 – 11
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