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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7000 • www.exar.com

SP3485_200_051916

ABSOLUTE MAXIMUM RATINGS

These are stress ratings only and functional operation

of the device at these ratings or any other above those

indicated in the operation sections of the specifications

below is not implied. Exposure to absolute maximum

rating conditions for extended periods of time may

affect reliability.

V

Input Voltages

Logic....................................-0.3V to +6.0V

Drivers.................................-0.3V to +6.0V

Receivers.........................................+/-15V

Output Voltages

Drivers.............................................+/-15V

Receivers............................-0.3V to +6.0V

Storage Temperature.......................-65˚C to +150˚C

Power Dissipation

8-pin NSOIC...................................................600mW

(derate 6.90mW/ºC above +70ºC)

ELECTRICAL CHARACTERISTICS

T

PARAMETERS

MIN.

TYP.

MAX.

UNITS CONDITIONS

SP3485 DRIVER

DC Characteristics

Differential Output Voltage

GND

Vcc

Volts

Unloaded; R = ∞Ω ; Figure 1

Differential Output Voltage

2

Vcc

Volts

With Load; R = 50Ω (RS-422);

Figure 1

Differential Output Voltage

1.5

Vcc

Volts

With Load; R = 27Ω (RS-485);

Figure 1

Change in Magnitude of Driver

Differential Output Voltage for

Complimentary states

0.2

Volts

R = 27Ω or R = 50Ω; Figure 1

Driver Common Mode Output

Voltage

3

Volts

R = 27Ω or R = 50Ω; Figure 1

Input High Voltage

2.0

Volts

Applies to DE, DI, RE

Input Low Voltage

0.8

Volts

Applies to DE, DI, RE

Input Current

+/-10

µA

Applies to DE, DI, RE

Driver Short Circuit Current

V

+/-250

mA

-7V ≤ V

Driver Short Circuit Current

V

+/-250

mA

-7V ≤ V

SP3485 DRIVER

AC Characteristics

Maximum Data Rate

10

Mbps

RE = V

Driver Input to Output, t

PLH

17

60

ns

Figures 2 & 9

Driver Input to Output, t

PHL

17

60

ns

Figures 2 & 9

Differential Driver Skew

2

10

ns

|t

Driver Rise or Fall Time

5

20

ns

From 10%-90%; Figures 3 and 10