DS14185 Datasheet, PDF (5/8 Pages) National Semiconductor (TI) – EIA/TIA-232 3 Driver x 5 Receiver

Pin Descriptions (Continued)
Pin #
10
20
Name
V^−
V_CC
Description
Negative Power Supply Pin (−9.0 ≤ V^− ≤ −13.2)
Positive Power Supply Pin (+5V ±5%)
Applications Information
In a typical Data Terminal Equipment (DTE) to Data
Circuit-Terminating Equipment (DCE) 9-pin de-facto inter-
face implementation, 2 data lines and 6 control lines are re-
quired. 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 solutuion for this DTE interface. As shown in Figure 5,
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
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 out-
put is set to V_OL to sink the current from the V^− terminal. Re-
fer to typical curves of V_OUT/I_OUT.Typical mouse specifica-
tions are:
10 mA at +6V
5 mA at −6V
FIGURE 5. Typical DTE Application
DS011938-7
5
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