XF3

XF1

CHEN

DGND

CGND

0V

CHEN

0V

50%

V

or

V

RX

CD

RX

CD

0V

+

-

0V

TestInput

Signal

90%

SN65HVD61

www.ti.com

SLLS770D

– JANUARY 2007 – REVISED JUNE 2011

PARAMETER MEASUREMENT INFORMATION (continued)

Figure 7. Test Circuit and Signal Waveforms, Receiver Enable and Disable With High Bus Input

Table 1. FUNCTION TABLES

TRANSMITTER

INPUTS

OUTPUTS

CHEN

TXEN

TX

TXBAR

XF1

XF3

L or OPEN

X

X

X

Z

Z

L or OPEN

X

X

Z

Z

L or OPEN

L or OPEN

Z

Z

H

H

L or OPEN

H

Z

L

H

L or OPEN

L

Z

(1)

This combination is not supported and should be avoided in ControlNet applications

RECEIVER

INPUTS

OUTPUT

CHEN

XF1, XF3

CONDITION

RX

L or OPEN

X

Chip disabled

Z

Negative signal

L

H

No signal

?

Positive signal

H

CARRIER DETECT

INPUTS

OUTPUT

CHEN

XF1, XF3

CONDITION

CD

L or OPEN

X

Chip disabled

Z

Carrier not detected

L

Carrier detected

H

Copyright

© 2007–2011, Texas Instruments Incorporated

9