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Data processor having an output terminal with selectable output impedances

DC
  • US 5,859,541 A
  • Filed: 09/15/1993
  • Issued: 01/12/1999
  • Est. Priority Date: 12/24/1990
  • Status: Expired due to Term
First Claim
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1. In an integrated circuit, a circuit having an output terminal, comprising:

  • a plurality of output buffers, each output buffer having a predetermined buffer output impedance, an input coupled to a buffer information input terminal of the circuit, and an output coupled to the output terminal of the circuit, each output buffer being electrically coupled between the information input terminal and the output terminal in response to a control signal having a value which is controlled and may be varied only during a predetermined mode of operation of the integrated circuit by a user of the circuit in response to an impedance selection input being asserted at an input pin of the integrated circuit, the user being able to select predetermined discrete, output impedances of the circuit by controlling the value of the impedance selection input.

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