Semiconductor device with bus terminating function

  • US 7,106,092 B2
  • Filed: 03/19/2003
  • Issued: 09/12/2006
  • Est. Priority Date: 10/23/2002
  • Status: Active Grant
First Claim
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1. A semiconductor device, comprising:

  • a pad;

    a first output transistor comprising a first source impurity region, a first drain impurity region, a first gate and a first drain contact in contact with the first drain impurity region and coupled to the pad, wherein the pad is drivem by the first output transistor in accordance with an internal signal applied to the first gate;

    a terminating circuit including a first resistance element having one end coupled to the pad and a first terminating transistor coupled between another end of the first resistance element and a first voltage node, the first terminating transistor comprising a second source impurity region, a second drain impurity region, a second gate and a second drain contact in contact with the second drain impurity region and coupled to the another end of the first resistance element, the first terminating transistor being made conductive on accordance with a termination control signal;

    an interconnection line coupled from the pad to one end of the first resistance element of the terminating circuit, and including a portion coupled to the first drain contact, wherein the terminating circuit is arranged further than the first output transistor away from the pad; and

    a first distance between the second drain contact and the second gate of the first terminating transistor being less than a second distance between the first drain contact and the first gate of the first output transistor, measured in a direction of a gate length a gate length of each transistor.

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