SP490 datasheet(5/12 Pages) SIPEX

5 / 12 page

Date: 05/10/04

SP490/491 Full Duplex RS-485 Transceivers

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.

CC............................................................................................................................+7V

Input Voltages

Logic...................................................-0.5V to (V

CC+0.5V)

Drivers................................................-0.5V to (V

CC+0.5V)

Receivers..................................................................±14V

Output Voltages

Logic...................................................-0.5V to (V

CC+0.5V)

Drivers......................................................................±14V

Receivers...........................................-0.5V to (V

CC+0.5V)

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

Power Dissipation.....................................................................1000mW

MIN to TMAX and VCC = 5V ± 5% unless otherwise noted.

PARAMETERS

MIN.

TYP.

MAX.

UNITS

CONDITIONS

SP491 DRIVER

DC Characteristics

Differential Output Voltage

GND

Volts

Unloaded; R = ∞ ; see figure 1

Differential Output Voltage

Volts

With Load; R = 50Ω; (RS422);

see figure 1

Differential Output Voltage

1.5

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

Volts

R = 27Ω or R = 50Ω; see 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

OUT = HIGH

250

-7V ≤ V

O ≤ 12V

OUT = LOW

250

-7V ≤ V

O ≤ 12V

SP491 DRIVER

AC Characteristics

Maximum Data Rate

Mbps

REB = 5V, DE = 5V

Driver Input to Output

PLH; RDIFF = 54Ω, CL1 = CL2 = 100pF;

see figures 3 and 6

Driver Input to Output

PHL; RDIFF = 54Ω, CL1 = CL2 = 100pF;

see figures 3 and 6

Driver Skew

see figures 3 and 6,

SKEW = | tDPLH - tDPHL |

Driver Rise or Fall Time

From 10% to 90%; R

DIFF = 54Ω,

L1 = CL2 = 100pF; see figures 3 and 6

Driver Enable to Output High

L1 = CL2 = 100pF; see figures

4 and 7; S

2 closed

Driver Enable to Output Low

L1 = CL2 = 100pF; see figures

4 and 7; S

1 closed

Driver Disable Time from Low

L1 = CL2 = 100pF; see figures

4 and 7; S

1 closed

Driver Disable Time from High

L1 = CL2 = 100pF; see figures

4 and 7; S

2 closed

ELECTRICAL CHARACTERISTICS

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