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FEATURES

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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)

QFN PACKAGE

(TOP VIEW)

GND

C1–

FORCEON

FORCEOFF

INVALID

ROUTB2

ROUT1

ROUT2

RIN1

RIN2

RIN3

RIN4

RIN5

DOUT1

DOUT2

DOUT3

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DESCRIPTION

MAX3243E

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

WITH

±15-kV IEC ESD PROTECTION

SLLS657A – APRIL 2005 – REVISED JUNE 2005

•

Single-Chip and Single-Supply Interface for

IBM™ PC/AT™ Serial Port

•

ESD Protection for RS-232 Bus Pins

–

±15-kV Human-Body Model (HBM)

–

±8-kV IEC61000-4-2, Contact Discharge

–

±15-kV IEC61000-4-2, Air-Gap Discharge

•

Meets or Exceeds Requirements of

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

•

•

Always-Active Noninverting Receiver Output

(ROUT2B)

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Designed to Transmit at a Data Rate up to

500 kbit/s

•

Low Standby Current . . . 1

µA Typ

•

External Capacitors . . . 4

× 0.1 µF

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Accepts 5-V Logic Input With 3.3-V Supply

•

Designed to Be Interchangeable With Maxim

MAX3243E

•

Serial-Mouse Driveability

•

Auto-Powerdown Feature to Disable Driver

Outputs When No Valid RS-232 Signal Is

Sensed

•

Applications

– Battery-Powered Systems, PDAs,

Notebooks, Laptops, Palmtop PCs, and

Hand-Held Equipment

•

Package Options Include Plastic

Small-Outline (DW), Shrink Small-Outline

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

Packages

The MAX3243E device consists of three line drivers, five line receivers, and a dual charge-pump circuit with

±15-kV ESD (HBM and IEC61000-4-2, Air-Gap Discharge) and ±8-kV ESD (IEC61000-4-2, Contact Discharge)

protection on serial-port connection pins. 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.

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.

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

PRODUCTION DATA information is current as of publication date.

Copyright © 2005, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.