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5-volt low level serial transceiver

  • US 5,325,395 A
  • Filed: 03/31/1992
  • Issued: 06/28/1994
  • Est. Priority Date: 03/31/1992
  • Status: Expired due to Fees
First Claim
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1. A low level serial digital transceiver presenting a constant impedance to a cable during active mode, stand-by mode and power-off mode operation and using reduced power in the active and stand-by mode comprising:

  • an isolator portion coupled to said cable having a fixed impedance connected to provide said constant impedance during operation in said active mode, stand-by mode and power-off mode;

    a transmitter portion connected to said isolator portion and coupled to receive two separate transistor-transistor logic data streams having means actuated by receiving said two separate transistor-transistor logic data streams for amplifying said two separate transistor-transistor logic data streams to convert the information thereof into representative low-level serial signals during operation in said active mode at a predetermined amplitude during operation in said active mode;

    a receiver portion connected to the isolator portion and having a comparator circuit coupled to receive low-level serial data signals from said isolator portion of a predetermined magnitude during operation in said stand-by mode to convert received said low-level serial data signals to representative transistor-transistor logic signals; and

    a single power source of positive polarity only, being coupled to said transmitter portion and said receiver portion to enable the operation thereof in the active and stand-by mode.

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