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Tester with driver/sensor circuit having programmable termination devices

  • US 4,168,796 A
  • Filed: 04/13/1978
  • Issued: 09/25/1979
  • Est. Priority Date: 04/13/1978
  • Status: Expired due to Term
First Claim
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1. A tester for testing printed circuit boards, said tester comprising in combination:

  • (a) a processor;

    (b) a bus connected to said processor;

    (c) a plurality of programmable driver/sensor circuits each having a data input terminal and a terminal selectively programmable either as an input terminal for sensing a signal on said programmable terminal or as an output terminal responsive to a data signal applied to said data input terminal;

    (d) first means for coupling said programmable terminals to the respective terminals of a printed circuit board to be tested;

    (e) second means responsive to said processor for routing information from said bus to the data input terminals of said driver/sensor circuit; and

    (f) each of said driver/sensor circuits further comprising first and second termination means for producing pull-up and pull-down currents coupled to the programmable terminal of that driver/sensor circuit; and

    (g) mode control means for selecting said first or said second termination means for producing said pull-up or said pull-down current coupled to the programmable terminal of said driver/sensor circuit.

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