DS14196WM datasheet(4/7 Pages) NSC

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Parameter Measurement Information

Pin Descriptions

Pin #

Description

Name

2, 3, 4, 7, 9

Driver Input Pins

12, 14, 17, 18, 19

OUT

Driver Output Pins, RS-232 Levels

13, 15, 16

Receiver Input Pins, RS-232 Levels

5, 6, 8

OUT

Receiver Output Pins

GND

Ground

Positive Power Supply Pin (+9.0

≤ V+ ≤ +13.2)

−

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 DS14196 isa5x3 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.

FAILSAFE RECEIVER OUTPUTS

The DS14196 features failsafe receiver outputs. In failsafe

mode, if the receiver input becomes zero or an open-circuit,

the receiver output is pulled to a high level.

LapLink COMPATIBILITY

The DS14196 can easily provide 128 kbps data rate under

maximum driver load conditions of C

L = 2500 pF and RL = 3

Ω, while power supplies are:

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/IOUT.Typical mouse specifica-

tions are:

10 mA at +6V

5 mA at −6V

DS012613-3

FIGURE 1. Driver Propagation Delay and

Transition Time Test Circuit (Note 5)

DS012613-4

FIGURE 2. Driver Propagation Delay and Transition

Time Waveforms Slew Rate (SR) = 6V/(t

r or tf)

DS012613-5

FIGURE 3. Receiver Propagation Delay and Transition

Time Test Circuit (Note 6)

DS012613-6

FIGURE 4. Receiver Propagation Delay and

Transition Time Waveform

DS14196WM Datasheet(PDF) 4 Page - National Semiconductor (TI)

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