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Data bus system

  • US 5,550,804 A
  • Filed: 12/07/1994
  • Issued: 08/27/1996
  • Est. Priority Date: 12/09/1993
  • Status: Expired due to Term
First Claim
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1. Data bus system comprised of:

  • a) a serial data bus (DB) operated with complementary logic signals,b) several system users (TN1 . . . Tnn), communicating with each other via the bus lines (BL1, BL2) of the data bus (DB),c) several output stages (ES1 . . . Esn) each having a transmitter (ST) and a receiver (ET), with each system user (TN1 . . . Tnn) being assigned an output stage (ES1 . . . Esn) for coupling to the data bus (DB), andwherein,d) the output stage (ES1 . . . Esn) of each system user (TN1 . . . Tnn) includes a respective terminating network (ANW1 . . . ANW2) coupled to the bus lines (BL1, BL2),e) the terminating network (ANW1) of at least one output stage (ES1) is low impedance, active, and internally switchable from one impedance value present on the bus lines to another impedance value present on the bus lines,f) the terminating network (ANW3 . . . ANWn) of at least one more output stage (ES2) is passive and of low impedance,g) the terminating networks (ANW3 . . . ANWn) of all other output stages (ES3) . . . ESn) are passive and of high impedance.

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