5

Rev. 10/11/02

SP3490/3491 Low Power Full-Duplex RS485 Transceivers

© Copyright 2002 Sipex Corporation

SPECIFICATIONS

T

PARAMETERS

MIN.

TYP.

MAX.

UNITS

CONDITIONS

SP3491 DRIVER

DC Characteristics

Differential Output Voltage

GND

V

CC

Volts

Unloaded; R = ∞; 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

Applies to D, REB, DE

Input LOW Voltage

0.8

Volts

Applies to D, REB, DE

Input Current

+10

µA

Applies to D, REB, DE

Driver Short-Circuit Current

V

+250

mA

-7V < V

V

+250

mA

-7V < V

SP3491 DRIVER

AC Characteristics

Maximum Data Rate

10

Mbps

Driver Input to Output, t

PLH

20

40

60

ns

Figures 2 and 8

Driver Input to Output, t

PHL

20

40

60

ns

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

Driver Enable to Output HIGH

52

120

ns

Figures 4 and 10

Driver Enable to Output LOW

60

120

ns

Figures 5 and 10

Driver Disable from LOW

40

120

ns

Figures 5 and 10

Driver Disable from HIGH

60

120

ns

Figures 4 and 10

NOTE 1: The input pulse is supplied by a generator with the following characteristics:

PRR=250KHz, 50% duty cycle, t

NOTE 2: C