SP483EEN Ver la hoja de datos (PDF) - Signal Processing Technologies

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SP483EEN

Enhanced Low EMI Half-Duplex RS-485 Transceiver

Signal Processing Technologies 

INPUTS

OUTPUTS

LINE

RE DE DI CONDITION B A

X 1 1 No Fault

01

X 1 0 No Fault

10

X0X

X

ZZ

X 1 X Fault

ZZ

Table 1. Transmit Function Truth Table

INPUTS

RE DE

0

0

0

0

0

0

1

0

OUTPUTS

A-B

R

+0.2V

1

-0.2V

0

Inputs Open

1

X

Z

Table 2. Receive Function Truth Table

+3V

DE

0V

5V

A, B

VOL

VOH

A, B

0V

f = 100kHz; tR < 10ns; tF < 10ns

1.5V

tZL

2.3V Output normally LOW

1.5V

tLZ

0.5V

2.3V Output normally HIGH

tZH

0.5V

tHZ

Figure 6. Driver Enable and Disable Times

V0D2+

A–B

V0D2–

VOH

R

VOL

tPHL

tSKEW = | tPHL - tPLH |

Figure 7. Receiver Propagation Delays

0V

0V

INPUT

1.5V

OUTPUT

tPLH

f = 100kHz; tR < 10ns; tF < 10ns

1.5V

+3V

RE

0V

5V

R

VIL

VIH

R

0V

f = 100kHz; tR < 10ns; tF < 10ns

1.5V

tZL

1.5V

tLZ

1.5V Output normally LOW

0.5V

1.5V Output normally HIGH

tZH

0.5V

tHZ

Figure 8. Receiver Enable and Disable Times

SP483EDS/05

SP483E Low EMI Half-Duplex RS485 Transceiver

5

© Copyright 2000 Sipex Corporation

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