2

Rev. 07/28/04

SP481/483/485 Low Power Half-Duplex RS485 Transceivers

© Copyright 2002 Sipex Corporation

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

Output Voltages

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

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

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

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

Power Dissipation...........................................................................500mW

ELECTRICAL CHARACTERISTICS

T

PARAMETERS

MIN.

TYP.

MAX.

UNITS

CONDITIONS

SP481/SP483/SP485 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; (RS422);

see figure 1

Differential Output Voltage

1.5

V

CC

Volts

with load; R = 27Ω; (RS485); 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

35

250

mA

-7V ≤ V

V

35

250

mA

-7V ≤ V

SP481/SP485 DRIVER

AC Characteristics

Maximum Data Rate

Mbps

RE = 5V, DE = 5V

Driver Input to Output

30

60

ns

t

see figures 3 and 6

Driver Input to Output

30

60

ns

t

see figures 3 and 6

Driver Skew

5

10

ns

see figures 3 and 6,

t

Driver Rise or Fall Time

15

40

ns

From 10% to 90%; R

C

Driver Enable to Output High

40

70

ns

C

Driver Enable to Output Low

40

70

ns

C

Driver Disable Time from Low

40

70

ns

C

Driver Disable Time from High

40

70

ns

C

SP481/SP483/SP485 RECEIVER

DC Characteristics

Differential Input Threshold

+0.2

Volts

-7V ≤ V

Input Hysteresis

10

mV

V

Output Voltage Hig

h

2.4

Volts

I

Output Voltage Low

0.4

Volts

I

Three-State (High Impedance)

Output Current

±1

µA

0.4V ≤ V

Input Resistance

15

kΩ

-7V ≤ V

Input Current (A, B); V

+1.0

mA

DE = 0V, V

Input Current (A, B); V

-0.8

mA

DE = 0V, V

Short-Circuit Current

95

mA

0V ≤ V

5

5

0.0