SN65LBC184, SN75LBC184
DIFFERENTIAL TRANSCEIVER
WITH TRANSIENT VOLTAGE SUPPRESSION
SLLS236A – OCTOBER 1996 – REVISED MAY 1998
D
D
D
D
D
D
D
D
D
D
D
D
Integrated Transient Voltage Suppression
ESD Protection for Bus Terminals:
–
±
15 kV Human Body Model
–
±
8 kV IEC1000-4-2, Contact Discharge
–
±
15 kV IEC1000-4-2, Air-Gap Discharge
Circuit Damage Protection of 400 W Peak
(Typical)
Controlled Driver Output-Voltage Slew
Rates Allows Longer Cable Stub Lengths
250-kbits/s in Electrically Noisy
Environments
Open-Circuit Fail-Safe Receiver Design
1/2 Unit Load Allows for 64 Devices
Connected on Bus
Thermal Shutdown Protection
Power-Up/-Down Glitch Protection
Each Transceiver Meets or Exceeds the
Requirements of EIA RS-485 and ISO/IEC
8482:1993(E) Standards
Low Disabled Supply Current 300
µA
Max
Pin Compatible with SN75176
D OR P PACKAGE
(TOP VIEW)
R
RE
DE
D
1
2
3
4
8
7
6
5
V
CC
B
A
GND
functional logic diagram (positive logic)
DE
D
3
4
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 CEI IEC 1000-4-5 simulates the
overvoltage transient and models a unidirectional
surge caused by overvoltages from switching and
secondary lightning transients.
RE
R
2
1
6
7
A
B
Bus
V
±
VP
±
1/2 VP
1.2
µs
50
µs
t
Figure 1. Surge Waveform — Combination Wave
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.
Copyright
©
1998, Texas Instruments Incorporated
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.
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