Rev:B Date: 02/26/04

SP1481E Low Power Half-Duplex RS485 Transceivers

© Copyright 2004 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

Logic........................................................-0.3V to (V

Drivers..................................................-0.3V to (V

Receivers................................................................. ±15V

T

PARAMETERS

MIN.

TYP.

MAX.

UNITS

CONDITIONS

SP1481E DRIVER

DC Characteristics

Differential Output Voltage

3.5

V

CC

Volts

Unloaded; R = ∞ ; see Figure 1

Differential Output Voltage

2

V

CC

Volts

with load; R = 50Ω; (RS-422);

see Figure 1

Differential Output Voltage

1.5

V

CC

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

±10

µA

Applies to DE, DI, RE

Driver Short-Circuit Current

V

±250

mA

-7V ≤ V

V

±250

mA

-7V ≤ V

SP1481E DRIVER

AC Characteristics

Maximum Data Rate

20

Mbps

RE = 5V, DE = 5V; R

C

Driver Input to Output

10

30

40

ns

t

see Figures 3 and 5

10

ns

t

Driver Skew

3

ns

see Figures 3 and 5,

t

Driver Rise or Fall Time

8

20

ns

From 10% to 90%; R

C

Driver Enable to Output High

40

70

ns

C

closed

Driver Enable to Output Low

40

70

ns

C

closed

Driver Disable Time from Low

40

70

ns

C

closed

Driver Disable Time from High

40

70

ns

C

closed

Output Voltages

Logic........................................................-0.3V to (V

Drivers...................................................................... ±15V

Receivers............................................-0.3V to (V

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

Power Dissipation per Package

ELECTRICAL CHARACTERISTICS