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

SP48E,485E_00_2808

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

ELECTRICAL CHARACTERISTICS

T

PARAMETERS

MIN.

TYP.

MAX.

UNITS CONDITIONS

SP481E/SP485E DRIVER

DC Characteristics

Differential Output Voltage

GND

Vcc

Volts

Unloaded; R = ∞ ; see Figure 1

Differential Output Voltage

2

Vcc

Volts

With Load; R = 50Ω (RS-422); see

Figure 1

Differential Output Voltage

.5

Vcc

Volts

With Load; R = 27Ω (RS-485); see

Figure 1

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

V

+/-250

mA

-7V ≤ V

SP481E/SP485E DRIVER

AC Characteristics

Max. Transmission Rate

0

Mbps

RE = 5V, DE = 5V; R

C

Driver Input to Output, t

PLH

20

30

60

ns

See Figures 3 & 5, R

C

Driver Input to Output, t

PLH

(SP485EMN ONLY)

20

30

80

ns

Driver Input to Output, t

PHL

20

30

60

ns

See Figures 3 & 5, R

C

Driver Input to Output, t

PHL

(SP485EMN ONLY)

20

30

80

ns

Driver Skew

5

0

ns

see Figures 3 and 5,

t

Driver Rise or Fall Time

3

5

40

ns

From 0%-90%; R

C

and 6

Output Voltages

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

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

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

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

Power Dissipation

8-pin NSOIC...................................................550mW

(derate 6.60mW/ºC above +70ºC)

8-pin PDIP....................................................000mW

(derate .8mW/ºC above +70ºC)