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SP485EMN-L

Enhanced Low Power Half-Duplex RS-485 Transceivers

Exar Corporation 

INPUTS

OUTPUTS

LINE

RE DE DI CONDITION A B

X

1

1

No Fault

1

0

X

1

0

No Fault

0

1

X

0

X

X

ZZ

X

1

X

Fault

ZZ

Table 1. Transmit Function Truth Table

Function Truth Tables

INPUTS

RE DE

00

00

00

10

A-B

+0.2V

-0.2V

Inputs Open

X

OUTPUTS

R

1

0

1

Z

Table 2. Receive Function Truth Table

+3V

DE

0V

5V

A, B

VOL

VOH

A, B

0V

SWITCHING WAVEFORMS

f = 1MHz; tR < 10ns; tF < 10ns

1.5V

t ZL

1.5V

t LZ

2.3V

Output normally LOW

0.5V

2.3V

t ZH

Output normally HIGH

0.5V

t HZ

Figure 6. Driver Enable and Disable Times

VOD2+

A– B

VOD2–

VOH

R

VOL

tPHL

f = 1MHz; tR ≤10ns ; t F ≤ 10ns

0V

INPUT

1.5V

OUTPUT

tPLH

0V

1.5V

Figure 7. Receiver Propagation Delays

+3V

RE

0V

5V

R

VIL

VIH

R

0V

1.5V f = 1MHz; tR ≤ 10ns; tF ≤ 10ns

t ZL

1.5V

Output normally LOW

1.5V

t ZH

Output normally HIGH

1.5V

t LZ

0.5V

0.5V

t HZ

Figure 8. Receiver Enable and Disable Times

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com



SP481E,485E_102_080810

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