Patent ID: 6072720
Filing Date: 2000-06-06
Classification: G11C,H01L

Abstract:
A programmable interconnect cell for selectively connecting circuit nodes in an integrated circuit comprisinga) a semiconductor body having a major surface,b) a field effect switch transistor formed in the semiconductor body abutting the major surface, said switch transistor having first and second source/drains connected to a first and second circuit node, a floating gate for storing charge, and a control gate for turning said first field effect transistor on and off responsive to charge on the floating gate,c) a field effect sense transistor formed in the semiconductor body abutting the major surface and spaced from the switch transistor, said sense transistor having first and second source/drains, a floating gate for storing charge, and a control gate for turning said sense transistor on and off responsive to charge on the floating gate, andd) a buried bitline formed in the semiconductor body abutting the major surface in juxtaposition with the switch transistor and the sense transistor, a floating gate overlying the buried bitline and separated therefrom by a tunnel oxide, and a control gate overlying the floating gate, the floating gate of the switch transistor, the sense transistor and the buried bitline being interconnected, and the control gate of the switch transistor, the sense transistor, and the bitline being interconnected.