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2801234fc

LTC2801/LTC2802/

LTC2803/LTC2804

1.8V to 5.5V RS-232

Single and Dual Transceivers

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

dual RS-232 transceivers in narrow SSOP and chip-scale

DFN packages. All operate over a supply range of 1.8V to

5.5V, which permits operation directly from two alkaline,

NiCd or NiMH cells. An integrated DC-to-DC converter

generates power supplies for driving RS-232 levels. A

logic supply pin allows easy interfacing with different logic

levels independent of the DC-DC supply.

These parts are compatible with the TIA/EIA-232-F stan-

dard. Driver outputs are protected from overload and can

be shorted to ground or up to ±15V without damage. To

extend battery life, receivers can be kept active, operating

at reduced speed, with only 15μA current. In shutdown

mode, current is further reduced to 1μA. Line sharing and

half-duplex operation are also supported.

1Mbps for 250pF/3kΩ Load (LTC2802, LTC2804)

250kbps for 1nF/3kΩ Load

100kbps for 2.5nF/3kΩ TIA/EIA-232-F Load

Active Modes

Interface

Microprocessor

Half-Duplex Operation

LTC2801/LTC2802 4mm × 3mm DFN Package

LTC2803/LTC2804 Narrow SSOP-16 and

5mm × 3mm DFN Packages

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

LTC2802 at 1.8V and 1Mbps

TIN

TOUT

ROUT

2V/DIV

5V/DIV

2V/DIV

400ns/DIV

WRAPPING DATA

TOUT LOAD = 250pF + RIN

ROUT LOAD = 150pF

2801 TA01b

PS

MODE

TIN

ROUT

GND

SW

CAP

TOUT

RIN

LTC2802

2801 TA01a

L1

10μH

C2

1μF

C3

1μF

C1

220nF

1.8V TO 5.5V

OFF ON

C4

1μF

PRODUCT SELECTION GUIDE

PART NUMBER

DRIVERS

RECEIVERS

PACKAGE

LTC2801

1

1

12-Lead DFN

LTC2802

1

1

12-Lead DFN

LTC2803

2

2

16-Lead DFN

LTC2803-1

2

2

16-Lead Narrow SSOP

LTC2804

2

2

16-Lead DFN

LTC2804-1

2

2

16-Lead Narrow SSOP