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

SP490,49_00_07408

ABSOLUTEMAXIMUMRATINGS

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

Drivers................................................-0.5V to (V

Receivers..................................................................±4V

Output Voltages

Drivers......................................................................±4V

Receivers...........................................-0.5V to (V

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

Power Dissipation.....................................................................000mW

PARAMETERSMIN.TYP. MAX.UNITS CONDITIONS

SP490DRIVER

DCCharacteristics

Differential Output Voltage

GND

V

CC

Volts

Unloaded; R = ∞ ; see figure 1

Differential Output Voltage

2

V

CC

Volts

With Load; R = 50Ω; (RS422);

see figure 1

Differential Output Voltage

.5

V

CC

Volts

With Load; R = 27Ω; (RS485); 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 D

Input Low Voltage

0.8

Volts

Applies to D

Input Current

±0

µA

Applies to D

Driver Short-Circuit Current

V

35

250

mA

-7V ≤ V

V

35

250

mA

-7V ≤ V

SP490DRIVER

ACCharacteristics

Maximum Data Rate

5

Mbps

Driver Input to Output

30

60

ns

t

see figures 3 and 6

Driver Input to Output

30

60

ns

t

see figures 3 and 6

Driver Skew

5

ns

see figures 3 and 6,

t

Driver Rise or Fall Time

5

40

ns

From 0% to 90%; R

C

SP490RECEIVER

DCCharacteristics

Differential Input Threshold

0.2

+0.2

Volts

-7V ≤ V

Input Hysteresis

70

mV

V

Output Voltage High

3.5

Volts

I

Output Voltage Low

0.4

Volts

I

Input Resistance

12

15

kΩ

-7V ≤ V

Input Current (A, B); V

±.0

mA

V

Input Current (A, B); V

-0.8

mA

V

Short-Circuit Current

85

mA

0V ≤ V

ELECTRICALCHARACTERISTICS

T