Patent ID: 6603331
Filing Date: 2003-08-05
Classification: G11C,H03K

Abstract:
A logic device adapted to function as a logic circuit in an operational mode and to be tested in a test mode, the logic device comprising:a. a power-supply line adapted to distribute an external power-supply voltage throughout the logic device; b. a device pin adapted to receive a variable input signal; c. a device input circuit adapted to receive logic signals in the operational mode, the input circuit having: i. a power-supply terminal connected to the power-supply line; and ii. a device input terminal connected to the device pin; and d. a transmitter circuit including: i. a transistor having: 1) a first current-handling terminal connected to the device input pin; 2) a second current-handing terminal; and 3) a control terminal; and ii. an amplifier having: 1) an amplifier input terminal connected to the device input pin; and 2) an amplifier output terminal connected to the transistor control terminal; 3) wherein the amplifier is adapted to produce, on the amplifier output terminal, an amplifier output voltage greater than the power-supply voltage when the logic device is in the test mode.