DS14C335

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SNLS090C – MARCH 2000 – REVISED APRIL 2013

APPLICATION INFORMATION

9-PIN SERIAL PORT APPLICATION

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 and the

control lines are RTS, DTR, DSR, DCD, CTS and RI. The DS14C335 is a 3 x 5 Driver/Receiver and offers a

single chip solution for the DTE interface as shown in Figure 10.

Ring Indicator (RI) is used to inform the DTE that an incoming call is coming from a remote DCE. When the

DS14C335 is in SHUTDOWN (SD) mode, receiver five (R5) remains active and monitors RI circuit. This active

receiver (R5) alerts the DTE to switch the DS14C335 from SHUTDOWN to active mode.

Figure 10. Typical DTE Application

MOUSE DRIVING

The DS14C335 was tested for drive current under the following mouse driving conditions:

•

V+ terminal of the mouse electronics

•

•

One receiver was used to accept data from the mouse

•

Completion of the testing (performed by TI's Data Transmission Applications Group and a major PC

manufacturer) concluded that the DS14C335 and it's DC-DC Convertor supplied adequate drive capability to

power a typical PC mouse. The mouse tested was specified with the following conditions:

10 mA at +6V

5.0 mA at

−6V

Since driver current is limited, it is recommended that newer lower power mice be specified for battery powered

applications. Using older high power mice is wasteful of precious battery charge.

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