LTC1535CSW datasheet(4/16 Pages) LINER

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LTC1535

1535fa

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

life of a device may be impaired.

Note 2: RS422 50

Ω specification based on RS485 27Ω test.

Note 3: IIN is tested at VCC2 = 5V, guaranteed by design from

GND2

≤ VCC2 ≤ 5.25V.

Note 4: Input fault conditions on the RS485 receiver are detected with a

fixed receiver offset. The offset is such that an input short or open will

result in a high data output.

Note 5: The low voltage detect faults when VCC2 or VCC drops below VUVL

and reenables when greater than VUVH. The fault can be monitored

through the weak driver output on RE.

Note 6: Value derived from 1 second test.

Note 7: The input signals are internally sampled and encoded. The internal

sample rate determines the data output jitter since the internal sampling is

asynchronous with respect to the external data. Nominally, a 4MHz

internal sample rate gives 250ns of sampling uncertainty in the input

signals.

Note 8: The maximum baud rate is 250kBd with 10% sampling jitter.

Lower baud rates have lower jitter.

Note 9: Start-up time is the time for communication to recover after a fault

condition. Data time-out is the time a fault is indicated on RE after data

communication has stopped.

Note 10. ICC measured with no load, ST1 and ST2 floating.

TYPICAL PERFOR A CE CHARACTERISTICS

TEMPERATURE (

°C)

–50 –25

100 125 150

1535 G01

130

120

110

100

RL = 54Ω

VCC = 5V

COOPER

CTX02-14659

TRANSFORMER

RL = 120Ω

RL = OPEN

TEMPERATURE (

°C)

–50 –25

100 125 150

1535 G02

VCC2 = 6V

VCC2 = 5V

VCC2 = 4.5V

fDI = fMAX

SLO = 0V

RL = 54Ω

TEMPERATURE (

°C)

–50 –25

100 125 150

1535 G03

6.5

6.0

5.5

5.0

4.5

RL = 54Ω, VCC = 5V

RL = 54Ω, VCC = 4.5V

fDI = 250kHz

SLO = 0V

COOPER

CTX02-14659

TRANSFORMER

RL = OPEN, VCC = 5V

TEMPERATURE (

°C)

–50 –25

100 125 150

1535 G04

500

400

300

200

100

VCC = VCC2 = 4.5V

SLO = VCC2

RL = 54Ω

TEMPERATURE (

°C)

–50 –25

100 125 150

1535 G05

VCC2 = 5V, 4.5V

SLO = VCC2

RL = 54Ω

TEMPERATURE (

°C)

–50 –25

100 125 150

1535 G06

800

700

600

500

400

300

200

SLO = 0V

RL = 54Ω

VCC2 = 5V

VCC2 = 4.5V

VCC Supply Current vs

Temperature

VCC2 Supply Current vs

Temperature

VCC2 Supply Voltage vs

Temperature

Maximum Baud Rate vs

Temperature

Driver Differential Output Rise/

Fall Time vs Temperature

Driver Differential Output Rise/

Fall Time vs Temperature

ELECTRICAL CHARACTERISTICS

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