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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com

SP483_485_0_0627

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 (Vcc + 0.5V)

Drivers......................-0.3V to (Vcc + 0.5V)

Receivers.........................................+/-5V

ELECTRICAL CHARACTERISTICS

T

PARAMETERS

MIN.

TYP.

MAX.

UNITS CONDITIONS

SP483/SP485 DRIVER

DC Characteristics

Differential Output Voltage

Vcc

Volts

Unloaded; R = ∞ ; see figure 1

Differential Output Voltage

2

Vcc

Volts

With Load; R = 50Ω (RS-422);

see figure 

Differential Output Voltage

.5

Vcc

Volts

With Load; R = 27Ω (RS-485);

see figure 

Change in Magnitude of Driver

Differential Output Voltage for

Complimentary states

0.2

Volts

R = 27Ω or R = 50Ω; see figure 1

Driver Common Mode Output

Voltage

3

Volts

R = 27Ω or R = 50Ω; see 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

+/-0

µA

Applies to DE, DI, RE

Driver Short Circuit Current,

V

250

mA

-7V ≤ V

Driver Short Circuit Current,

V

250

mA

-7V ≤ V

SP485 DRIVER

AC Characteristics

Maximum Data Rate

5

Mbps

RE = 5V, DE = 5V

Driver Input to Output, t

PLH

30

60

ns

Figures 3 and 5, R

C

Driver Input to Output, t

PHL

30

60

ns

Figures 3 and 5, R

C

Driver Skew

5

0

ns

Figures 3 and 5,

t

Driver Rise or Fall Time

5

40

ns

From 0%-90%; R

C

and 5

Output Voltages

Logic.........................-0.3V to (Vcc + 0.5V)

Drivers.............................................+/-5V

Receivers..................-0.3V to (Vcc + 0.5V)

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

Power Dissipation

8-pin NSOIC...................................................500mW