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MAX3227

3-V TO 5.5-V SINGLE-CHANNEL RS-232 LINE DRIVER/RECEIVER

WITH

±15-kV ESD PROTECTION

SLLS673A – AUGUST 2005 – REVISED FEBRUARY 2006

INPUT CONDITIONS

OUTPUT STATES

RECEIVER

VALID

OR

RS-232

OPERATING MODE

DRIVER

FORCEON

FORCEOFF

LEVEL

DRIVER

RECEIVER

INVALID

READY

EDGE

PRESENT AT

WITHIN

RECEIVER

30 s

Auto-Powerdown Plus Conditions

Normal operation,

H

H

NO

NO

Active

Active

L

H

auto-powerdown plus disabled

Normal operation,

H

H

NO

YES

Active

Active

H

H

auto-powerdown plus disabled

Normal operation,

L

H

YES

NO

Active

Active

L

H

auto-powerdown plus enabled

Normal operation,

L

H

YES

YES

Active

Active

H

H

auto-powerdown plus enabled

Powerdown,

L

H

NO

NO

Z

Active

L

L

auto-powerdown plus enabled

Powerdown,

L

H

NO

YES

Z

Active

H

L

auto-powerdown plus enabled

X

L

X

NO

Z

Active

L

L

Manual powerdown

X

L

X

YES

Z

Active

H

L

Manual powerdown

Auto-Powerdown Conditions

Powerdown,

INVALID

INVALID

X

NO

Z

Active

L

L

auto-powerdown enabled

Normal operation,

INVALID

INVALID

X

YES

Active

Active

H

H

auto-powerdown enabled

(1)

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

2

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