SP490EDS/14

SP490E Enhanced Full Duplex RS-485 Transceivers

© Copyright 2000 Sipex Corporation

2

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

Receivers..................................................................

±14V

Output Voltages

Drivers......................................................................

±14V

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

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

Power Dissipation.....................................................................1000mW

SPECIFICATIONS

T

PARAMETERS

MIN.

TYP.

MAX.

UNITS

CONDITIONS

SP490E DRIVER

DC Characteristics

Differential Output Voltage

GND

V

CC

Volts

Unloaded; R =

∞; see Figure 1

Differential Output Voltage

2

V

CC

Volts

With Load; R = 50

Ω; (RS-422);

see Figure 1

Differential Output Voltage

1.5

V

CC

Volts

With Load; R = 27

Ω; (RS-485);see Figure1

Change in Magnitude of Driver

Differential Output Voltage for

Complimentary States

0.2

Volts

R = 27

Ω or R = 50Ω; see Figure 1

Driver Common-Mode

Output Voltage

3

Volts

R = 27

Ω 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

±10

µA

Applies to D

Driver Short-Circuit Current

V

±250 mA

-7V

≤ V

V

±250 mA

-7V

≤ V

SP490E DRIVER

AC Characteristics

Maximum Data Rate

10

Mbps

R

Driver Input to Output

20

30

60

ns

t

see Figures 3 and 6

Driver Input to Output

20

30

60

ns

t

see Figures 3 and 5

Driver Skew

5

ns

see Figures 3 and 5,

t

Driver Rise or Fall Time

3

15

40

ns

From 10% to 90%; R

C

SP490E RECEIVER

DC Characteristics

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

k

Ω

-7V

≤ V

Input Current (A, B); V

±1.0

mA

V

Input Current (A, B); V

-0.8

mA

V

Short-Circuit Current

85

mA

0V

≤ V