STC3485E Datasheet, PDF (10/11 Pages) List of Unclassifed Manufacturers – 3.3V-Powered, ±15kV ESD-Protected, and Slew-Rate-Limited True RS-485 Transceivers

Machine Model
The Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. Its objective is to emulate the
stress caused when I/O pins are contacted by handling equipment during test and assembly. Of course, all pins require this protection,
not just RS-485 inputs and outputs.
Typical Applications
The STC3485E transceivers are designed for bidirectional data communications on multipoint bus transmission lines. Figures 1
shows typical network applications circuits.
To minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line
should be kept as short as possible. The slew-rate-limited STC3485E is more tolerant of imperfect termination.
Figure 15a. Human Body ESD Test Model
Figure 15b. Human Body Current Waveform
Figure 16a. IEC 1000-4-2 ESD Test Model
Figure 16b. IEC 1000-4-2 ESD Generator Current Waveform