SN65LBC182

SN75LBC182

SLLS500A − MAY 2001 − REVISED MARCH 2005

DIFFERENTIAL BUS TRANSCEIVER

A

DE

B

RE

D

R

functional block diagram

3

4

2

1

6

7

1

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FEATURES

Devices on a Bus

−

±15-kV Human Body Model

−

±8-kV IEC61000-4-2, Contact Discharge

−

±15-kV IEC61000-4-2, Air-Gap Discharge

Standard TIA/EIA-485-A and ISO 8482: 1987(E)

Allow Longer Cable Stub Lengths

Protection

APPLICATIONS

DESCRIPTION

The SN65LBC182 and SN75LBC182 are differential

data line transceivers with a high level of ESD protection

in the trade-standard footprint of the SN75176. They are

designed for balanced transmission lines and meet

ANSI standard TIA/EIA-485-A and ISO 8482. The

SN65LBC182 and SN75LBC182 combine a 3-state,

differential line driver and differential input line receiver,

both of which operate from a single 5-V power supply.

The driver and receiver have active-high and active-low

enables,

respectively,

which

can

be

externally

connected together to function as a direction control.

The driver outputs and the receiver inputs connect

internally to form a differential input/output (I/O) bus port

that is designed to offer minimum loading to the bus.

This port operates over a wide range of common-mode

voltage, making the device suitable for party-line

applications. The device also includes additional

features for party-line data buses in electrically noisy

environment applications such as industrial process

control or power inverters.

The SN75LBC182 and SN65LBC182 bus pins also

exhibit a high input resistance equivalent to one-fourth

unit load allowing connection of up to 128 similar

devices on the bus. The high ESD tolerance protects

the device for cabled connections. (For an even higher

level of protection, see the SN65/75LBC184, literature

number SLLS236.)

The

differential

driver

design

incorporates

slew-rate-controlled outputs sufficient to transmit data

up to 250 kbps. Slew-rate control allows longer

unterminated cable runs and longer stub lengths from

the main backbone than possible with uncontrolled

voltage transitions. The receiver design provides a

fail-safe output of a high level when the inputs are left

floating (open circuit). Very low device supply current

can be achieved by disabling the driver and the receiver.

The SN65LBC182 is characterized for operation from

−40

°C to 85°C, and the SN75LBC182 is characterized

for operation from 0

°C to 70°C.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

†The signaling rate of a line, is the number of voltage transitions that are made per second expressed in the units bps (bits per second).

Copyright

 2001, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.