LTC486

1

486fc

TYPICAL APPLICATION

DESCRIPTION

Quad Low Power

RS485 Driver

designedformultipointdatatransmissionstandardRS485

applications with extended common-mode range (12V to

–7V). It also meets RS422 requirements.

The CMOS design offers significant power savings over

its bipolar counterpart without sacrificing ruggedness

against overload or ESD damage.

The driver features three-state outputs, with the driver

outputs maintaining high impedance over the entire

common-moderange.Excessivepowerdissipationcaused

by bus contention or faults is prevented by a thermal

shutdown circuit which forces the driver outputs into a

high impedance state.

Both AC and DC specifications are guaranteed from 0°C

to 70°C (Commercial), –40°C to 85°C (Industrial), over

the 4.75V to 5.25V supply voltage range.

RS485 Length Specification

FEATURES

APPLICATIONS

n

n

Designed for RS485 or RS422 Applications

n

Single 5V Supply

n

–7V to 12V Bus Common-Mode Range Permits ±7V

GND Difference Between Devices on the Bus

n

Thermal Shutdown Protection

n

Power-Up/Down Glitch-Free Driver Outputs Permit

Live Insertion/Removal of Package

n

Driver Maintains High Impedance in Three-State or

with the Power Off

n

28ns Typical Driver Propagation Delays with 5ns

Skew

n

Pin Compatible with the SN75172, DS96172,

µA96172, and DS96F172

n

Low Power RS485/RS422 Drivers

n

Level Translator

486 TA01a

RECEIVER

EN

DI

EN

4

4

12

1

1/4 LTC486

120

120

RO

3

EN

2

1

1/4 LTC488

4000 FT BELDEN 9841

DRIVER

DATA RATE (bps)

10k

* APPLIES FOR 24 GAUGE, POLYETHYLENE

DIELECTRIC TWISTED PAIR

10

100

1k

10k

100k

1M

10M

486 TA01b

2.5M

L

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

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