7.4 Device Functional Modes

Table 7-1. Each Driver (1)

INPUTS

OUTPUT

DRIVER STATUS

DIN

FORCEON

FORCEOFF

VALID RIN

RS-232 LEVEL

DOUT

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

X

L

H

NO

Z

Power off by

auto-powerdown feature

(1)

H = high level, L = low level, X = irrelevant, Z = high impedance, YES = any RIN valid, NO = all RIN invalid

Table 7-2. Each Receiver (1)

INPUTS

OUTPUTS

RECEIVER STATUS

RIN

FORCEON

FORCEOFF

ROUT

X

X

L

Z

Powered off

L

X

H

H

Normal operation

H

X

H

L

Open

X

H

H

(1)

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

Table 7-3. INVALID and ROUT2B Outputs (1)

INPUTS

OUTPUTS

OUTPUT STATUS

VALID RIN

RS-232 LEVEL

RIN2

FORCEON

FORCEOFF

INVALID

ROUT2B

YES

L

X

X

H

L

Always Active

YES

H

X

X

H

H

YES

OPEN

X

X

H

L

Always Active

NO

OPEN

X

X

L

L

(1)

H = high level, L = low level, X = irrelevant, Z = high impedance (off),

OPEN = input disconnected or connected driver off, YES = any RIN valid, NO = all RIN invalid

MAX3243

SLLS350Q – APRIL 1999 – REVISED AUGUST 2024

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