“深圳维卡斯科技有限公司”
Integrated Transient Voltage Suppression
D
ESD Protection for Bus Terminals Exceeds:
±
30 kV IEC 61000-4-2, Contact Discharge
±
15 kV IEC 61000-4-2, Air-Gap Discharge
±
15 kV EIA/JEDEC Human Body Model
Circuit Damage Protection of 400-W Peak
(Typical) Per IEC 61000-4-5
Controlled Driver Output-Voltage Slew
Rates Allow Longer Cable Stub Lengths
250-kbps in Electrically Noisy
Environments
Open-Circuit Fail-Safe Receiver Design
1/4 Unit Load Allows for 128 Devices
Connected on Bus
Thermal Shutdown Protection
Power-Up/-Down Glitch Protection
Each Transceiver Meets or Exceeds the
Requirements of TIA/EIA-485 (RS-485) and
ISO/IEC 8482:1993(E) Standards
Low Disabled Supply Current 300
µA
Max
Pin Compatible With SN75176
Applications:
− Industrial Networks
− Utility Meters
− Motor Control
SN65LBC184D (Marked as 6LB184)
SN75LBC184D (Marked as 7LB184)
SN65LBC184P (Marked as 65LBC184)
SN75LBC184P (Marked as 75LBC184)
(TOP VIEW)
DR
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 IEC 61000-4-5 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
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