DS8935WM datasheet(8/12 Pages) NSC

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Typical Application Information (Continued)

TABLE 1. Device Pin Descriptions

Pin#

Name

Description

2, 4

TTL Driver Input Pins

EN1

Active Low Driver Enable Pin. A High on this Pin TRI-STATEs the Driver

Outputs (D1 Only)

OUT+

Non-Inverting Driver Output Pin

17, 18

OUT−

Inverting Driver Output Pin

13, 15

IN+

Non-Inverting Receiver Input Pin

16, 14

IN−

Inverting Receiver Input Pin

5, 6, 7

OUT

Receiver Output Pin

Active Low Receiver Enable

Active High Receiver Enable

10, 11

N/C

Not Connected

GND

Ground Pin

Negative Power Supply Pin, −5V ±5%

Positive Power Supply Pin, +5V ±5%

DRIVER OUTPUT WAVEFORMS

The driver configuration on the DS8935 is unique among

TIA/EIA-422 devices in that it utilizes −5V V

EE supply. A typi-

cal TIA/EIA-422 driver uses +5V only and generates signal

swings of approximately 0V–5V.

By utilizing V

EE, the differential driver is able to generate a

much larger differential signal. The typical output voltage is

about |4| V, which gives |8| V differentially, thus providing a

much greater noise margin than +5V drivers. See

Figure 13.

The receiver therefore has a range of +8V to −8V or V

SS of

16V (V

SS = VOD–VOD*).

Each side of the differential driver operates similar to a TIA/

EIA-423 driver. The output voltages are slightly different due

to the loading: the differential driver has differential termina-

tion, the single-ended driver is terminated with a resistor to

ground.

DS012066-15

DS012066-16

Note 9: VCC = +5V, VEE = −5V

Note 10: D1 Enabled (Active)

FIGURE 13. Typical Driver Output Waveforms

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