9

LTC1484

A (Pin 6): Driver Output/Receiver Input. The input resis-

tance is typically 22k when the driver is disabled (DE = 0).

When the driver is enabled, the A output follows the logic

level at the DI pin.

B (Pin 7): Driver Output/Receiver Input. The input resis-

tance is typically 22k when the driver is disabled (DE = 0).

When the driver is enabled, the B output is inverted from

the logic level at the DI pin.

bypass capacitor is recommended.

Driver

INPUTS

OUTPUTS

RE

DE

DI

B

A

X1

1

0

1

X1

0

1

0

O0

X

Z

Z

10

X

Z*

Z*

FU CTIO TABLES

Receiver

INPUTS

OUTPUTS

RE

DE

A – B

RO

00

1

00

0

0

0

Inputs Open

1

0

0

Inputs Shorted

1

1X

X

TEST CIRCUITS

OUTPUT

UNDER

TEST

S1

S2

500

Ω

1484 F05

OUTPUT

UNDER

TEST

1k

S1

S2

1k

1484 F03

Figure 3

Figure 5

DE

RE

A

B

DI

RO

15pF

A

B

1484 F04

Figure 4

Note: Z = high impedance, X = don’t care

*Shutdown mode for LTC1484

termination resistors.

A

B

R

R

1484 F01

Figure 1

A

B

375

Ω

375

Ω

60

Ω

–7V TO 12V

1484 F02

Figure 2