LTC487



487fc

Typical applicaTion

DescripTion

Quad Low Power

RS485 Driver

designedformultipointdatatransmissionstandardRS485

applications with extended common mode range (–7V to

12V). 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 com-

mon mode range. Excessive power dissipation caused

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) and over

the 4.75V to 5.25V supply voltage range.

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.

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 SN75174, DS96174,

µA96174, and DS96F174

n

Low Power RS485/RS422 Drivers

n

Level Translator

2

DRIVER

LTC487 TA01

RECEIVER

DI

EN 12

4

3

1

1/4 LTC487

120

120

RO

3

EN 12

4

2

1

1/4 LTC489

4000 FT BELDEN 9841

DATA RATE (bps)

10k

10

100

1k

10k

100k

1M

10M

LTC487 TA09

2.5M

RS485 Cable Length Specification*

*APPLIES FOR 24 GAUGE, POLYETHYLENE

DIELECTRIC TWISTED PAIR