10/15/02

SP3481/3485 Low Power Half-Duplex RS485 Transceivers

© Copyright 2000 Sipex Corporation

2

SPECIFICATIONS

T

PARAMETERS

MIN.

TYP.

MAX.

UNITS

CONDITIONS

SP3481/SP3485 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 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

SP3481/SP3485 DRIVER

AC Characteristics

Maximum Data Rate

10

Mbps

RE = V

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

10

ns

t

Figures 2 and 9

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 Time from Low

40

120

ns

Figures 5 and 10

Driver Disable Time from High

60

120

ns

Figures 4 and 10

SP3481/SP3485 RECEIVER

DC Characteristics

Differential Input Threshold

-0.2

+0.2

Volts

-7V ≤ V

Input Hysteresis

20

mV

V

Output Voltage High

V

Volts

V

Output Voltage Low

0.4

Volts

V

Three-State (High Impedance)

Output Current

+1

µA

0V ≤ V

Input Resistance

12

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

7

60

mA

0V ≤ V

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 +6.0V

Drivers ................................................... -0.3V to +6.0V

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

Output Voltages

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

Receivers .............................................. -0.3V to +6.0V

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

Power Dissipation per Package