Abstract: An improved power-on reset circuit is provided for controlling reset signal transition until after the power supply has achieved operational levels. Specifically, the reset signal is designated to transition from a high to a low state after the power supply exceeds a fixed reference voltage. The reference voltage is set at a voltage value greater than the operational voltage level of devices within a load circuit connected to the output of the power-on reset circuit. The power-on reset circuit includes numerous subcircuits used to define the reference voltage, trigger the reference voltage in relation to the power supply voltage, delay the triggered voltage, and buffer the delayed, triggered voltage to a reset value capable of driving load circuit impedances.

Abstract: A reduced noise, low power, high speed output buffer circuit is provided for driving a load. The output buffer circuit utilizes multiple stage pull-up and pull-down transistors. During the time in which the first stage pull-down (or pull-up) transistor is activated, all of the opposing pull-up (or pull-down) transistors are deactivated at substantially the same time. Thereafter, the remaining stages of pull-down (or pull-up) transistors are activated. Delayed turn on in conjunction with rapid turn off achieves low overshoot and undershoot noise transient levels at the power supplies.

Abstract: An anti-noise circuit dissipates parasitic tank circuit energy which causes ground unershoot and V.sub.cc overshoot in the power rails (PG,PV) of an integrated circuit device. An anti-noise circuit transistor element, either an anti-undershoot circuit transistor element (AUCT) or an anti-overshoot circuit transistor element (AOCT) incorporates selected resistance in its primary current path for providing dissipating resistance. The anti-noise circuit couples a current source (PV), the anti-noise circuit transistor element (AUCT, AOCT) with dissipating resistance, and power rail parasitic lead inductance in series in a sacrificial current path. A control circuit coupled to the control node of the anti-noise circuit transistor element (AUCT,AOCT) causes sacrificial current flow following switching of potential levels at the output for dissipating parasitic tank circuit energy. The control circuit incorporates an active pullup and pulldown passgate (RST1,ICT1,OCT1) (RST2,ICT3, OCT2) between the data input (V.