Datasheet > 508653F

508653F

更新时间： 2024-11-28 23:21:39

品牌	Logo	应用领域
其他 - ETC		/
页数	文件大小	规格书
8页	202K
描述
IC

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508653F 数据手册

LTC1487

Ultra-Low Power RS485

with Low EMI, Shutdown

and High Input Impedance

DESCRIPTIO

EATURE

High Input Impedance: Up to 256 Transceivers

on the Bus

The LTC^®1487 is an ultra-low power differential line trans-

ceiverdesignedwithhighimpedanceinputsallowingupto

256 transceivers to share a single bus. It meets the

requirementsofRS485andRS422.TheLTC1487features

output drivers with controlled slew rate, decreasing the

EMI radiated from the RS485 lines, and improving signal

fidelity with misterminated lines. The CMOS design offers

significant power savings without sacrificing ruggedness

against overload or ESD damage. Typical quiescent cur-

rent is only 80µA while operating and 1µA in shutdown.

■

Low Power: I_CC= 120µA Max with Driver Disabled

I_CC= 200µA Max with Driver Enabled, No Load

1µA Quiescent Current in Shutdown Mode

Controlled Slew Rate Driver for Reduced EMI

Single 5V Supply

ESD Protection to ±10kV On Receiver Inputs and

Driver outputs

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

Ground Difference Between Devices on the Data Line

Thermal Shutdown Protection

Power Up/Down Glitch-Free Driver Outputs Permit

Live Insertion or Removal of Transceiver

Driver Maintains High Impedance in Three-State

or with the Power Off

■

The driver and receiver feature three-state outputs, with

the driver outputs maintaining high impedance over the

entire common-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. The receiver has a fail-safe

feature which guarantees a high output state when the

inputsareleftopen. I/Opinsareprotectedagainstmultiple

ESD strikes of over ±10kV using the Human Body Model.

■

Pin Compatible with the LTC485

O U

PPLICATI

The LTC1487 is fully specified over the commercial tem-

perature range and is available in 8-pin DIP and SO

packages.

■

Battery-Powered RS485/RS422 Applications

Low Power RS485/RS422 Transceiver

Level Translator

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

TYPICAL APPLICATI

LTC1487

2000 FEET OF TWISTED-PAIR WIRE

120Ω

330Ω

4.7nF

EQUIVALENT LOAD OF 256

LTC1487 TRANSCEIVERS

LTC1487 • TA01

LTC1487 • TA02

12 3 4 5 6 7 8

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