MAX3243

3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER

SLLS350B – APRIL 1999 – REVISED JANUARY 2000

2

POST OFFICE BOX 655303

description (continued)

Auto-powerdown can be disabled when FORCEON and FORCEOFF are high, and should be done when driving

a serial mouse. With auto-powerdown enabled, the device is activated automatically when a valid signal is

applied to any receiver input. The INVALID output is used to notify the user if an RS-232 signal is present at any

receiver input. INVALID is high (valid data) if any receiver input voltage is greater than 2.7 V or less than –2.7 V

or has been between –0.3 V and 0.3 V for less than 30

µs. INVALID is low (invalid data) if all receiver input

voltages are between –0.3 V and 0.3 V for more than 30

µs. Refer to Figure 5 for receiver input levels.

The MAX3243C is characterized for operation from 0

°C to 70°C. The MAX3243I is characterized for operation

from –40

°C to 85°C.

AVAILABLE OPTIONS

PACKAGED DEVICES

TA

SHRINK

SMALL OUTLINE

(DB)

SMALL OUTLINE

(DW)

THIN SHRINK

SMALL OUTLINE

(PW)

0

°C to 70°C

MAX3243CDB

MAX3243CDW

MAX3243CPW

–40

°C to 85°C

MAX3243IDB

MAX3243IDW

MAX3243IPW

The DB, DW, and PW packages are available taped and reeled. Add the suffix R to

device type (e.g., MAX3243CDBR).

Function Tables

EACH DRIVER

INPUTS

OUTPUT

DIN

FORCEON

FORCEOFF

VALID RIN

RS-232 LEVEL

OUTPUT

DOUT

DRIVER STATUS

X

X

L

X

Z

Powered off

L

H

H

X

H

Normal operation with

H

HH

X

L

auto-powerdown disabled

L

L

H

Yes

H

Normal operation with

H

LH

Yes

L

auto-powerdown enabled

L

L

H

No

Z

Powered off by

H

L

H

No

Z

y

auto-powerdown feature

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

EACH RECEIVER

INPUTS

OUTPUTS

RIN2

RIN1,

RIN3–RIN5

FORCEOFF

VALID RIN

RS-232 LEVEL

ROUT2B

ROUT

RECEIVER STATUS

L

X

L

X

L

Z

Powered off while

H

XL

X

H

Z

ROUT2B is active

L

L

H

Yes

L

H

L

HH

Yes

L

L

Normal operation with

H

LH

Yes

H

H

Normal o eration with

auto-powerdown

di

bl d/

bl d

H

HH

Yes

H

L

disabled/enabled

Open

Open

H

No

L

H

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

driver off