Rev. 10/11/02

SP3490/3491 Low Power Full-Duplex RS485 Transceivers

© Copyright 2002 Sipex Corporation

2

SPECIFICATIONS

T

PARAMETERS

MIN.

TYP.

MAX.

UNITS

CONDITIONS

SP3490 DRIVER

DC Characteristics

Differential Output Voltage

GND

V

CC

Volts

Unloaded; R = ∞ Ω; Figure 1

Differential Output Voltage

2

V

CC

Volts

With Load; R = 50Ω; (RS-422);

Figure 1

Differential Output Voltage

1.5

V

CC

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

Input Low Voltage

0.8

Volts

Input Current

+10

µA

Driver Short-Circuit Current

V

+250

mA

-7V < V

V

+250

mA

-7V < V

SP3490 DRIVER

AC Characteristics

Maximum Data Rate

10

Mbps

Driver Input to Output, t

PLH

20

40

60

ns

R=27Ω, Figures 2 and 8

Driver Input to Output, t

PHL

20

40

60

ns

R=27Ω, Figures 2 and 8

Differential Driver Skew

2

ns

t

Figures 2 and 8

Driver Rise or Fall Time

5

20

ns

From 10% to 90%;

Figures 3 and 9

SP3490 RECEIVER

DC Characteristics

Differential Input Threshold

0.2

+0.2

Volts

-7V < V

Input Hysteresis

25

mV

V

Output Voltage High

V

Volts

I

Output Voltage Low

0.4

Volts

I

Input Resistance

12

15

kΩ

-7V < V

Input Current (A, B); V

1.0

mA

V

Input Current (A, B); V

-0.8

mA

V

Short-Circuit Current

60

mA

0V < V

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

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

Receivers ......................................................................... ±14V

Output Voltages

Drivers .............................................................................. ±14V

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

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

Power Dissipation per Package