Date: 6/21/04

SP485R RS-485 Serial Transceiver

© Copyright 2004 Sipex Corporation

3

RECEIVER INPUT GRAPH

Typically 25°C @ Vcc = +5V unless otherwise noted.

MIN.

TYP.

MAX.

UNITS

CONDITIONS

AC Characteristics

Maximum Data Rate

1

Mbps

Propagation Delay

See Figures 3 and 7

t

PHL

1200

ns

R

t

PLH

1200

ns

R

Differential Receiver Skew

60

ns

| t

C

SHUTDOWN TIMING (SP481R)

Time to Shutdown

50

600

ns

RE = V

RS-485 Driver

Enable Time

See Figures 4 and 6

Enable to Low

40

500

ns

C

Enable to High

40

500

ns

C

Disable Time

See Figures 4 and 6

Disable From Low

40

500

ns

C

Disable From High

40

500

ns

C

RS-485 Receiver

Enable Time

See Figures 2 and 8

Enable to Low

40

500

ns

C

Enable to High

40

500

ns

C

Disable Time

See Figures 2 and 8

Disable From Low

40

500

ns

C

Disable From High

40

500

ns

C

POWER REQUIREMENTS

Supply Voltage V

CC

+4.75

+5.25

Volts

Supply Current I

CC

No Load

300

500

µA

RE = V

No Load

500

900

µA

RE = V

Supply Current in Shutdown

0.5

10

µA

RE = V

ENVIRONMENTAL

Operating Temperature

Commercial (..C..)

0

+70

°C

Industrial (..E..)

–40

+85

°C

Storage Temperature

–65

+150

°C

ELECTRICAL CHARACTERISTICS

-7V

-3V

+6V

+12V

-60µA

+100µA

1/10 Unit Load

Maximum Input Current

versus voltage.

(Shaded region)

SP485R Reciever

-7V

-3V

+6V

+12V

-0.6 mA

+1.0mA

1 Unit Load

Maximum Input Current

versus voltage.

(Shaded region)

Standard SP485R Reciever