发明授权
- 专利标题： Multiple logic family compatible output driver
- 专利标题（中）： 多逻辑系列兼容输出驱动器
-
申请号： US673701申请日： 1996-06-25
-
公开(公告)号： US5952847A公开(公告)日： 1999-09-14
- 发明人: William C. Plants , Gregory W. Bakker
- 申请人： William C. Plants , Gregory W. Bakker
- 申请人地址： CA Sunnyvale
- 专利权人： Actel Corporation
- 当前专利权人： Actel Corporation
- 当前专利权人地址： CA Sunnyvale
- 主分类号： H01L29/78
- IPC分类号： H01L29/78 ; H01L21/8234 ; H01L27/088 ; H03K19/0175 ; H03K19/0185
摘要：
The output buffer circuit according to the present invention is connected to an I/O pad of the integrated circuit. The output buffer circuit includes an output totem pole, a level shifter and enable logic. The output totem pole has a first input connected to the level shifter and a second input connected to the enable logic. The output of the totem pole is connected to an I/O pad. The totem pole includes a pullup transistor connected to 3.3 volt Vcc and a pulldown transistor connected to ground. In a first embodiment of the invention, the pullup transistor in the totem pole is an N-channel MOS transistor, and in a second embodiment of the invention, the pullup transistor in the totem pole is a P-channel MOS transistor formed in an N-well tied to the 5 volt Vcc. In the first embodiment of the present invention, the N-Channel MOS pullup transistor is turned on by a 5 volt signal from the level shifter. In the second embodiment of the present invention, the P-Channel MOS pullup transistor is turned on by a ground level signal from the level shifter. The enable logic drives the output of the totem pole in response to input signals to the enable logic. The inputs to the enable logic are a Data input, a Global enable input and an Output enable input.
公开/授权文献
- US5170197A Panning head, with a torque sensor 公开/授权日：1992-12-08
信息查询
IPC分类:
