2801234fe

LTC2801/LTC2802/

LTC2803/LTC2804

Product Selection Guide

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.

n

1.8V to 5.5V Supply Voltage

n

Single and Dual Transceivers

n

High-Speed Operation

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

250kbps for 1nF/3kΩ Load

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

n

Low-Power 1µA Shutdown and 15µA Receivers-

Active Modes

n

No Damage or Latchup to ±10kV ESD on RS-232

Interface

n

Logic Supply Pin for Easy Level-Shifting to UART or

Microprocessor

n

Low-Latency Output Enable Allows Line Sharing and

Half-Duplex Operation

n

True RS-232 Compliant Output Levels

n

Small Footprint:

LTC2801/LTC2802 4mm

× 3mm DFN Package

LTC2803/LTC2804 Narrow SSOP-16 and

5mm

× 3mm DFN Packages

n

Battery-Powered Systems

n

Computers and Consumer Electronics

n

Diagnostic Ports

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

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

PART NUMBER

DRIVERS AND

RECEIVERS

MAXIMUM

DATA RATE

MODES*

PACKAGE

LTC2801

1 + 1

0.25Mbps SD, RA, DD, AO DFN-12

LTC2802

1 + 1

1Mbps

SD, RA, DD, AO DFN-12

LTC2803

2 + 2

0.25Mbps SD, RA, DD, AO DFN-16

LTC2803-1

2 + 2

0.25Mbps

SD, AO

SSOP-16

LTC2804

2 + 2

1Mbps

SD, RA, DD, AO DFN-16

LTC2804-1

2 + 2

1Mbps

SD, AO

SSOP-16

*SD = Shutdown, RA = Receiver Active (low power), DD = Drivers

Disabled, AO = All On