Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Output switching noise reduction
Patent
1994-01-26
1995-09-12
Westin, Edward P.
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Output switching noise reduction
326 27, 326121, 326 95, H03K 1716
Patent
active
054500192
ABSTRACT:
A push-pull output driver circuit is disclosed which includes control circuitry for controlling the gates of the driver transistors to effect precharge of the output terminal at the beginning of a cycle. Precharge is initiated at the beginning of each cycle, for example indicated by an address transition. The prior data state at the output is stored, and enables the opposing driver transistor from that which drove the stored prior data state by enabling a gated level detector with hysteresis, such as a Schmitt trigger, associated therewith. The transistor that drove the stored prior data state is disabled, thus precluding oscillations during precharge. The gated Schmitt triggers each receive the voltage of the output terminal and, when enabled, turn on a transistor which couples the output terminal to the gate of the driver transistor. The Schmitt triggers also control the precharge to terminate when the output terminal has reached an intermediate voltage, and so that oscillations are minimized as a result of the hysteresis characteristic. Connection of the output terminal to the gate of the precharging driver transistor helps to eliminate overshoot during precharge.
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Lysinger Mark A.
McClure David C.
Slemmer William C.
Anderson Rodney M.
Jorgenson Lisa K.
Robinson Richard K.
Sanders Andrew
SGS-Thomson Microelectronics Inc.
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