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SP485R

1/10th Unit Load RS-485 Transceiver

Signal Processing Technologies 

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.

VCC...........................................................................+7V

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

Power Dissipation

8-pin Plastic DIP...........................1000mW

8-pin Plastic N-SOIC.......................1000mW

Package Derating:

8-pin Plastic DIP

øJA....................................................62 °C/W

8-pin Plastic N-SOIC

øJA....................................................62 °C/W

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

MIN.

LOGIC INPUTS

VIL

VIH

LOGIC OUTPUTS

VOL

VOH

RS-485 DRIVER

DC Characteristics

TTL Input Levels

VIL

VIH

Outputs

Open Circuit Voltage

Differential Output

Balance

Common-Mode Output

Output Current

Short Circuit Current

AC Characteristics

Maximum Data Rate

Output Transition Time

Propagation Delay

tPHL

tPLH

Driver Output Skew

2.0

2.4

2.0

1.5

28.0

5

RS-485 RECEIVER

DC Characteristics

TTL Output Levels

VOL

VOH

2.4

Tri-State Output Current

Inputs

Common Mode Range

–7.0

Receiver Sensitivity

Input Impedance

120

ELECTRICAL CHARACTERISTICS

TYP. MAX. UNITS

0.8

Volts

Volts

0.4

Volts

Volts

CONDITIONS

IOUT= -3.2mA

IOUT= 1.0mA

0.8

Volts

Volts

6.0

5.0

±0.2

3.0

±250

Volts

Volts

Volts

Volts

mA

mA

RL=54Ω, CL=50pF

|VT| - |VT|

RL=54Ω

Terminated in –7V to +12V

Mbps

RL=54Ω

30

ns

Rise/fall time, 10%–90%

See Figures 3 and 5

60

100 ns

60

100 ns

5

15

ns

RDIFF=54Ω, CL1=CL2=100pF

RDIFF=54Ω, CL1=CL2=100pF

see Figure 3 and 5,

tSKEW = | tDPLH - tDPHL |

0.4

Volts

Volts

±1

µA

+12.0 Volts

±0.2 Volts

150

kΩ

0.4V≤VOUT ≤2.4V; RE = VCC

–7V ≤ VCM ≤ +12V

–7V ≤ VCM ≤ +12V

Date: 6/21/04

SP485R RS-485 Serial Transceiver

2

© Copyright 2004 Sipex Corporation

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