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Interface Circuits for TIA/EIA-485 (RS-485
Figure 5 shows how external diodes offer transient spike protection for the 485 transceiver, SN75ALS176. Figure 5. Input Protection for Noisy Environments R T is the usual termination resistance and is equivalent in value to the characteristic impedance, R 0 SLLA036D–March 2007–Revised August 2008 Interface Circuits for TIA/EIA-485 (RS-485)
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