SNLS093C – APRIL 1999 – REVISED APRIL 2013
APPLICATIONS INFORMATION
In a typical Data Terminal Equipment (DTE) to Data Circuit-Terminating Equipment (DCE) 9-pin de-facto
interface implementation, 2 data lines and 6 control lines are required. The data lines are TXD and RXD. The
control lines are RTS, DTR, DSR, DCD, CTS, and RI.
The DS14185 is a 3 x 5 Driver/Receiver and offers a single chip solution for this DTE interface. As shown in
this interface allows for direct flow-thru interconnect. For a more conservative design, the user may
wish to insert ground traces between the signal lines to minimize cross talk.
LapLink COMPATIBILITY
The DS14185 can easily provide 128 kbps data rate under maximum driver load conditions of C
L
= 2500 pF and
R
L
= 3 kΩ, while power supplies are:
V
CC
= 4.75V, V
+
= 10.8V, V
−
=
−10.8V
(1)
MOUSE DRIVING
A typical mouse can be powered from the drivers. Two driver outputs connected in parallel and set to V
OH
can be
used to supply power to the V
+
pin of the mouse. The third driver output is set to V
OL
to sink the current from the
V
−
terminal. Refer to typical curves of V
OUT
/I
OUT
.Typical mouse specifications are:
10 mA at +6V
5 mA at
−6V
(2)
(3)
Figure 7. Typical DTE Application
6
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