Patent ID: 6522164
Filing Date: 2003-02-18
Classification: H01L,H03K

Abstract:
A switching circuit for an output node, comprising:pull-up circuitry connected to said output node and an upper supply voltage node, said pull-up circuitry having control circuitry for causing said pull-up circuitry to supply a pull-up current to said output node; a switch having a controllable current path connected between said output node and said pull-up circuitry and having a control terminal connected to said upper supply voltage node, said switch being responsive to a voltage at said output node whereby said switch is rendered non-conductive when said output node is at a voltage substantially equal to said upper supply voltage node; pull-down circuitry connected to said output node and a lower supply voltage node for supplying a pull-down current to said output node; whereby when the voltage at said output node falls said switch becomes conductive, wherein said control circuitry substantially terminates operation of said pull-up circuitry while said switch is non-conductive.