4

FN6297.0

May 31, 2006

INVALID DRIVING FORCEON AND FORCEOFF (EMULATES AUTOMATIC POWER-DOWN)

X

Note 2

Note 2

Active

Active

Active

Yes

H

Normal Operation

X

Note 2

Note 2

High-Z

High-Z

Active

No

L

Forced Auto Power-down

NOTE:

2. Input is connected to INVALID Output.

TABLE 2. POWER-DOWN AND ENABLE LOGIC TRUTH TABLE

RS-232

SIGNAL

PRESENT

AT

RECEIVER

INPUT?

FORCEOFF

INPUT

FORCEON

INPUT

EN

INPUT

TRANSMITTER

OUTPUTS

RECEIVER

OUTPUTS

(NOTE 3)

OUTPUTS

INVALID

OUTPUT

MODE OF OPERATION

ICL3221E

No

H

H

L

Active

Active

N.A.

L

Normal Operation

(Auto Power-down Disabled)

No

H

H

H

Active

High-Z

N.A.

L

Yes

H

L

L

Active

Active

N.A.

H

Normal Operation

(Auto Power-down Enabled)

Yes

H

L

H

Active

High-Z

N.A.

H

No

H

L

L

High-Z

Active

N.A.

L

Power-down Due to Auto Power-down

Logic

No

H

L

H

High-Z

High-Z

N.A.

L

Yes

L

X

L

High-Z

Active

N.A.

H

Manual Power-down

Yes

L

X

H

High-Z

High-Z

N.A.

H

Manual Power-down w/Rcvr. Disabled

No

L

X

L

High-Z

Active

N.A.

L

Manual Power-down

No

L

X

H

High-Z

High-Z

N.A.

L

Manual Power-down w/Rcvr. Disabled

ICL3243E

No

H

H

N.A.

Active

Active

Active

L

Normal Operation

(Auto Power-down Disabled)

Yes

H

L

N.A.

Active

Active

Active

H

Normal Operation

(Auto Power-down Enabled)

No

H

L

N.A.

High-Z

Active

Active

L

Power-down Due to Auto Power-down

Logic

Yes

L

X

N.A.

High-Z

High-Z

Active

H

Manual Power-down

No

L

X

N.A.

High-Z

High-Z

Active

L

Manual Power-down

NOTE:

3. Applies only to the ICL3243E.

TABLE 1. POWER-DOWN LOGIC TRUTH TABLE (Continued)

RCVR OR

XMTR

EDGE

WITHIN 30

SEC?

FORCEOFF

INPUT

FORCEON

INPUT

TRANSMITTER

OUTPUTS

RECEIVER

OUTPUTS

OUTPUT

RS-232

LEVEL

PRESENT

AT

RECEIVER

INPUT?

INVALID

OUTPUT

MODE OF OPERATION

5962-0620701Q3A, 5962-0620702Q3A, 5962-0620703Q2A, 5962-0620704Q2A