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LTC1482

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

Linear Technology 

LTC1482

U

SWITCHING CHARACTERISTICS The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = 5V ±5% (Notes 2 and 3) unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

MIN TYP MAX UNITS

tCDH(SHDN) Receiver Input to CD Output High at Shutdown

RDIFF = 54Ω, CL1 = CL2 = 100pF,

q

(Figures 4, 11) DI/SHDN = DE

2600 5000

ns

tCDL(SHDN) Receiver Input to CD Output Low from Shutdown RDIFF = 54Ω, CL1 = CL2 = 100pF,

q

(Figures 4, 11) DI/SHDN = DE

2600 5000

ns

tZH(SHDN) Receiver Enable from Shutdown to Output High

tZL(SHDN) Receiver Enable from Shutdown to Output Low

CL = 15pF (Figures 3, 9) S2 Closed, q

A = 750mV, B = – 750mV, DE = 0,

DI/SHDN =

CL = 15pF (Figures 3, 9) S1 Closed, q

A = – 750mV, B = 750mV, DE = 0,

DI/SHDN =

30

600

ns

2600 5000

ns

tHZ(SHDN) Receiver Disable from High on Shutdown

CL = 15pF (Figures 3, 9) S2 Closed, q

A = 750mV, B = – 750mV, DE = 0,

DI/SHDN =

200

600

ns

tLZ(SHDN) Receiver Disable from Low on Shutdown

CL = 15pF (Figures 3, 9) S1 Closed, q

A = – 750mV, B = 750mV, DE = 0,

DI/SHDN =

200

600

ns

Note 1: Absolute Maximum Ratings are those values beyond which the life of

a device may be impaired.

Note 2: All typicals are given for VCC = 5V and TA = 25°C.

Note 3: All currents into device pins are positive; all currents out of device

pins are negative. All voltages are referenced to device ground unless

otherwise specified.

Note 4: For higher ambient temperatures, the part may enter thermal

shutdown during short-circuit conditions.

Note 5: Both driver input and driver enable pins are pulled high

simultaneously.

Note 6: Guaranteed by design.

Note 7: Measured with an external LTC1485 driver.

TYPICAL PERFOR A CE CHARACTERISTICS

Receiver Output Voltage vs Input

Voltage

6

TA = 25°C

5

4

3

2

1

VTHRO(LOW)

VTHRO(HIGH)

0

–0.2 –0.16 –0.12 –0.08 –0.04 0

INPUT VOLTAGE (V)

1482 G01

Receiver Input Threshold Voltage

(Output High) vs Temperature

0

–0.02

–0.04

VCM = 12V

VCC = 5V

VTHRO(HIGH)

–0.06

–0.08

–0.1

–0.12

VCM = 0V

VCM = –7V

–0.14

–0.16

–0.18

–0.20

–55 –35 –15 5 25 45 65 85 105 125

TEMPERATURE (°C)

1482 G02

Receiver Input Threshold Voltage

(Output Low) vs Temperature

0

–0.02

–0.04

VCC = 5V

VTHRO(LOW)

–0.06

–0.08

–0.1

VCM = 12V

–0.12

–0.14

–0.16

VCM = 0V

–0.18

VCM = –7V

–0.20

–55 –35 –15 5 25 45 65 85 105 125

TEMPERATURE (°C)

1482 G03

4

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