1 Features
• Designed for high-speed multipoint Data
transmission over long cables
• Operate with pulse durations as low as 30 ns
• Low supply current: 5 mA maximum
• Meet or exceed the requirements of ANSI
standard RS-485 and ISO 8482:1987(E)
• 3-State outputs for party-line buses
• Common-mode voltage range of –7 V to 12 V
• Thermal shutdown protection prevents
driver damage from bus contention
• Positive and negative output current
limiting
• Pin compatible with the SN75ALS180

2 Description
The SN55LBC180, SN65LBC180 and SN75LBC180
differential driver and receiver pairs are monolithic
integrated circuits designed for bidirectional data
communication over long cables that take on
the characteristics of transmission lines. They are
balanced, or differential, voltage mode devices
that meet or exceed the requirements of industry
standards ANSI RS-485 and ISO 8482:1987(E).
These devices are designed using the TI proprietary
LinBiCMOS™ with the low-power consumption of
CMOS and the precision and robustness of bipolar
transistors in the same circuit.