Electronic digital logic circuitry – Interface – Logic level shifting
Patent
1993-09-13
1995-03-07
Hudspeth, David R.
Electronic digital logic circuitry
Interface
Logic level shifting
326 57, 326 21, 327534, H03K 19003
Patent
active
053961285
ABSTRACT:
An output driver circuit has a circuitry portion (70) which is used to generate a Drive-Hi control signal in response to an Output Enable, an optional Precondition signal, and a Data Input signal. A circuit portion (75) ensures that the Drive-Hi control signal is maintained at a voltage which is substantially equal to Vdd when the Output Enable is deactivated. Circuit portion (80) selectively controls the Data Output by driving Vdd onto the Data Output in response to the Drive-Hi control signal being activated. A circuit portion (100) functions to selectively drive the Data Output to a logic zero (ground potential) when a Drive-Lo signal is asserted. Circuit portions (90 and 95) generate the Drive-Lo signal in response to the Output Enable, the optional Precondition signal, and the Data Input signal. In general, the output driver circuit allows an integrated circuit powered at a first voltage to interface to another integrated circuit which is powered at a higher second voltage without loss of performance, without excessive leakage currents, without crossover current, and without increasing gate oxide stresses.
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Dunning James E.
Gay James G.
Lundberg James R.
Ramus Richard S.
Hudspeth David R.
Motorola Inc.
Witek Keith E.
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