MAX3243

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

SLLS350B – APRIL 1999 – REVISED JANUARY 2000

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POST OFFICE BOX 655303

IBM

™ PC/AT™ Serial Port

TIA/EIA-232-F and ITU v.28 Standards

Output (ROUT2B)

Maxim MAX3243

±15-kV Using Human-Body Model (HBM)

– Battery-Powered Systems, PDAs,

Notebooks, Laptops, Palmtop PCs, and

Hand-Held Equipment

Small-Outline (DW), Shrink Small-Outline

(DB), and Thin Shrink Small-Outline (PW)

Packages

description

The MAX3243 device consists of three line drivers, five line receivers, and a dual charge-pump circuit with

±15-kV ESD protection pin-to-pin (serial-port connection pins, including GND). The device meets the

requirements of TIA/EIA-232-F and provides the electrical interface between an asynchronous communication

controller and the serial-port connector. This combination of drivers and receivers matches that needed for the

typical serial port used in an IBM PC/AT, or compatible. The charge pump and four small external capacitors

allow operation from a single 3-V to 5.5-V supply. In addition, the device includes an always-active noninverting

output (ROUT2B), which allows applications using the ring indicator to transmit data while the device is powered

down. The device operates at data signaling rates up to 250 kbit/s and a maximum of 30-V/

µs driver output slew

rate.

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.

Copyright

© 2000, Texas Instruments Incorporated

PRODUCT PREVIEW information concerns products in the formative or

design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the right to

change or discontinue these products without notice.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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C2+

C2–

V–

RIN1

RIN2

RIN3

RIN4

RIN5

DOUT1

DOUT2

DOUT3

DIN3

DIN2

DIN1

C1+

V+

GND

C1–

FORCEON

FORCEOFF

INVALID

ROUT2B

ROUT1

ROUT2

ROUT3

ROUT4

ROUT5

DB, DW, OR PW PACKAGE

(TOP VIEW)

AT, IBM, and PC are trademarks of International Business Machines Corporation.