LTC1482 datasheet(8/16 Pages) LINER

Part #	LTC1482

Description	Low Power RS485 Transceiver with Carrier Detect and Receiver Fail-Safe

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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8

LTC1482

Driver Output High Voltage vs

Output Current

Driver Output Low Voltage vs

Output Current

Driver Propagation Delay vs

Temperature

Driver Skew vs Temperature

Driver Propagation Delay vs

Supply Voltage

Driver Short-Circuit Current vs

Temperature

TYPICAL PERFOR A CE CHARACTERISTICS

TEMPERATURE (

°C)

–55

1482 G36

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

1482 G34

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

1482 G35

40

35

30

25

20

15

10

5

0

TA = 25°C

tPLH

tPHL

TEMPERATURE (

°C)

–55

1482 G33

40

35

30

25

20

15

10

5

0

VCC = 5V

tPHL

tPLH

–35 –15

5

25

45

65

85 105 125

external (DE = 0) driver. A weak internal pull-up removes

the need for an external pull-up resistor if fast rise times

are not important. Several LTC1482s can share the same

CD line. CD = 1 forces RO to the high fail-safe state. In

shutdown, CD is three-stated. This pin can be pulled above

VCC but should not be taken above 8V to avoid damage.

DE (Pin 3): Driver Enable Input. DE = 0 disables or three-

states the driver outputs. DE = 1 enables the driver outputs

with the high/low state of the outputs set by DI/SHDN.

DI/SHDN (Pin 4): Driver Input and Shutdown Input. It is

used together with the DE pin to put the part in shutdown

PIN FUNCTIONS

RO (Pin 1): Receiver Output. If a carrier is present (CD low)

and the part is not in shutdown, RO is high if the receiver

input differential voltage (A – B)

≥ VTHRO(MAX) and low if

(A – B)

≤ VTHRO(MIN). RO is forced to high (fail-safe state)

if a carrier is not present (CD = 1). In shutdown, RO is

three-stated. If the driver is enabled, RO follows the logic

level at the driver input.

CD (Pin 2): Open-Drain Carrier Detect Output. Provided

that the part is not in shutdown, the CD output is low if

VTHCD(MIN) ≥ (A – B) ≥ VTHCD(MAX) and high if VTHCD(MIN)

< (A – B) < VTHCD(MAX). This is true regardless of whether

the A and B pins are driven by the internal (DE = 1) or an

OUTPUT CURRENT (mA)

0

10 20 30 40 50 60 70 80 90 100

1482 G32

3.0

2.5

2.0

1.5

1.0

0.5

0

VCC = 4.75V

OUTPUT CURRENT (mA)

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

1482 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

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