Quadruple RS-485 Differential Line Drivers

The SN65LBC174A and SN75LBC174A are

quadruple differential line drivers with 3-state outputs, designed for TIA/EIA-485

(RS-485), TIA/EIA-422 (RS-422), and ISO 8482 applications.

These devices are optimized for

balanced multipoint bus transmission at signaling rates up to 30 million bits per

second. The transmission media may be printed-circuit board traces, backplanes, or

cables. The ultimate rate and distance of data transfer is dependent upon the

attenuation characteristics of the media and the noise coupling to the

environment.

Each driver features current limiting

and thermal-shutdown circuitry making it suitable for high-speed multipoint

applications in noisy environments. These devices are designed using LinBiCMOS, facilitating low

power consumption and robustness.

The two EN inputs provide pair-wise

driver enabling, or can be externally tied together to provide enable control of all

four drivers with one signal. When disabled or powered off, the driver outputs

present a high-impedance to the bus for reduced system loading.

The SN75LBC174A is characterized for

operation over the temperature range of 0°C to 70°C. The SN65LBC174A is

characterized for operation over the temperature range of –40°C to 85°C.