MAX3243

3V TO 5.5V MULTICHANNEL RS232 LINE DRIVER/RECEIVER

WITH ±15kV ESD (HBM) PROTECTION

SLLS350L − APRIL 1999 − REVISED MARCH 2004

2

POST OFFICE BOX 655303

description/ordering information (continued)

Flexible control options for power management are available when the serial port is inactive. The

auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of

operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFF

is set low, both drivers and receivers (except ROUT2B) are shut off, and the supply current is reduced to 1

µA.

Disconnecting the serial port or turning off the peripheral drivers causes the auto-powerdown condition to occur.

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.

ORDERING INFORMATION

TA

PACKAGE†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

SOIC (DW)

Tube of 20

MAX3243CDW

MAX3243C

SOIC (DW)

Reel of 1000

MAX3243CDWR

MAX3243C

0

°C to 70°C

SSOP (DB)

Tube of 50

MAX3243CDB

MAX3243C

0

°C to 70°C

SSOP (DB)

Reel of 2000

MAX3243CDBR

MAX3243C

TSSOP (PW)

Tube of 50

MAX3243CPW

MA3243C

TSSOP (PW)

Reel of 2000

MAX3243CPWR

MA3243C

SOIC (DW)

Tube of 20

MAX3243IDW

MAX3243I

SOIC (DW)

Reel of 1000

MAX3243IDWR

MAX3243I

−40

°C to 85°C

SSOP (DB)

Tube of 50

MAX3243IDB

MAX3243I

−40

°C to 85°C

SSOP (DB)

Reel of 2000

MAX3243IDBR

MAX3243I

TSSOP (PW)

Tube of 50

MAX3243IPW

MB3243I

TSSOP (PW)

Reel of 2000

MAX3243IPWR

MB3243I

† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are

available at www.ti.com/sc/package.

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

Normal operation with

auto-powerdown disabled

L

L

H

Yes

H

Normal operation with

H

LH

Yes

L

Normal operation with

auto-powerdown enabled

L

L

H

No

Z

Powered off by

H

L

H

No

Z

Powered off by

auto-powerdown feature

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