Rev. 5/16/03

SP481E Low Power Half-Duplex RS485 Transceivers

© Copyright 2003 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

SPECIFICATIONS

T

PARAMETERS

MIN.

TYP.

MAX.

UNITS

CONDITIONS

SP481E/SP485E 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 = 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

SP481E/SP485E DRIVER

AC Characteristics

Maximum Data Rate

10

Mbps

RE = 5V, DE = 5V; R

C

Driver Input to Output

20

30

60

ns

t

see Figures 3 and 5

Driver Input to Output

20

30

80

ns

t

(SP485EMN ONLY)

See Figures 3 and 5

Driver Input to Output

20

30

60

ns

t

see Figures 3 and 5

Driver Input to Output

20

30

80

ns

t

(SP485EMN ONLY)

see Figures 3 and 5

Driver Skew

5

10

ns

see Figures 3 and 5,

t

Driver Rise or Fall Time

3

15

40

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