SN65LBC184, SN75LBC184

DIFFERENTIAL TRANSCEIVER

WITH TRANSIENT VOLTAGE SUPPRESSION

SLLS236F − OCTOBER 1996 − REVISED APRIL 2005

1

POST OFFICE BOX 655303

±30 kV IEC 61000-4-2, Contact Discharge

±15 kV IEC 61000-4-2, Air-Gap Discharge

±15 kV EIA/JEDEC Human Body Model

(Typical) Per IEC 61000-4-5

Rates Allow Longer Cable Stub Lengths

Environments

Connected on Bus

Requirements of TIA/EIA-485 (RS-485) and

ISO/IEC 8482:1993(E) Standards

− Industrial Networks

− Utility Meters

− Motor Control

description

The SN75LBC184 and SN65LBC184 are differ-

ential data line transceivers in the trade-standard

footprint of the SN75176 with built-in protection

against high-energy noise transients. This feature

provides a substantial increase in reliability for

better immunity to noise transients coupled to the

data cable over most existing devices. Use of

these

circuits

provides

a

reliable

low-cost

direct-coupled (with no isolation transformer) data

line interface without requiring any external

components.

The SN75LBC184 and SN65LBC184 can with-

stand overvoltage transients of 400-W peak

(typical). The conventional combination wave

called out in IEC 61000-4-5 simulates the

overvoltage transient and models a unidirectional

surge caused by overvoltages from switching and

secondary lightning transients.

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.

1

2

3

4

8

7

6

5

R

RE

DE

D

B

A

GND

functional logic diagram (positive logic)

DE

RE

R

6

7

3

1

2

B

A

Bus

D

4

Figure 1. Surge Waveform — Combination Wave

1.2

µs

50

µs

V

t

± VP

± 1/2 VP

SN65LBC184D (Marked as 6LB184)

SN75LBC184D (Marked as 7LB184)

SN65LBC184P (Marked as 65LBC184)

SN75LBC184P (Marked as 75LBC184)

(TOP VIEW)

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.

Copyright

 2002, Texas Instruments Incorporated