LTC1484IS8 datasheet(8/16 Pages) LINER

Part #	LTC1484IS8

Description	Low Power RS485 Transceiver with Receiver Fail-Safe

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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8

LTC1484

RO (Pin 1): Receiver Output. If the receiver output is en-

abled (RE low) and the part is not in shutdown, RO is high

if (A – B) > VTH(MAX) and low if (A – B) < VTH(MIN). RO is

also high if the receiver inputs are open or shorted to-

gether, with or without a termination resistor.

RE (Pin 2): Receiver Output Enabled. A high on this pin

three-states the receiver output (RO) and a low enables it.

DE (Pin 3): Driver Enable Input. DE = high enables the

output of the driver with the driver outputs determined by

TYPICAL PERFOR A CE CHARACTERISTICS

Driver Output High Voltage vs

Output Current

Driver Output Low Voltage vs

Output Current

Driver Propagation Delay vs

Temperature

Driver Short-Circuit Current vs

Temperature

Driver Skew vs Temperature

Driver Propagation Delay vs

Supply Voltage

OUTPUT CURRENT (mA)

–100 –90 –80 –70 –60 –50 –40 –30 –20 –10 0

1484 G31

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

VCC = 4.75V

OUTPUT CURRENT (mA)

0

10 20 30 40 50 60 70 80 90 100

1484 G32

3.0

2.5

2.0

1.5

1.0

0.5

0

VCC = 4.75V

TEMPERATURE (

°C)

–55

1484 G33

50

45

40

35

30

25

20

15

10

5

0

VCC = 5V

tPHL

tPLH

–35 –15

5

25

45

65

85 105 125

TEMPERATURE (

°C)

–55

1484 G34

250

200

150

100

50

0

VCC = 5.25V

DRIVER OUTPUT HIGH

SHORT TO –7V

DRIVER OUTPUT LOW

SHORT TO 10V

–35 –15

5

25

45

65

85 105 125

TEMPERATURE (

°C)

–55

1484 G35

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

–35 –15

5

25

45

65

85 105 125

SUPPLY VOLTAGE (V)

4.5

4.75

5

5.25

5.5

1484 G36

40

35

30

25

20

15

10

5

0

TA = 25°C

tPHL

tPLH

PIN FUNCTIONS

the DI pin. DE = low forces the driver outputs into a high

impedance state. The LTC1484 enters shutdown when

both receiver and driver outputs are disabled (RE is high

and DE is low).

DI (Pin 4): Driver Input. When the driver outputs are

enabled (DE high), DI high takes the A output high and the

B output low. DI low takes the A output low and the B

output high.

GND (Pin 5): Ground.

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