MAX3243E

FUNCTION TABLES

ABC

INPUTS

OUTPUT

DRIVER STATUS

VALID RIN

DOUT

DIN

FORCEON

FORCEOFF

RS-232 LEVEL

X

X

L

X

Z

Powered off

L

H

H

X

H

Normal operation with

auto-powerdown disabled

H

H

H

X

L

L

L

H

Yes

H

Normal operation with

auto-powerdown enabled

H

L

H

Yes

L

L

L

H

No

Z

Powered off by

auto-powerdown feature

H

L

H

No

Z

(1)

H = high level, L = low level, X = irrelevant, Z = high impedance

INPUTS

OUTPUTS

VALID RIN

RECEIVER STATUS

RIN1,

ROUT1,

RIN2

FORCEOFF

RS-232

ROUT2B

ROUT2

RIN3–RIN5

ROUT3–5

LEVEL

L

X

L

X

L

Z

Z

Powered off while

ROUT2B is active

H

X

L

X

H

Z

Z

L

L

H

YES

L

H

H

L

H

H

YES

L

L

L

Normal operation with

H

L

H

YES

H

H

H

auto-powerdown

disabled/enabled

H

H

H

YES

H

L

L

Open

Open

H

YES

L

H

H

(1)

H = high level, L = low level, X = irrelevant, Z = high impedance (off), Open = input disconnected or connected driver off

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