发明授权
- 专利标题: Tri-state type driver circuit
- 专利标题(中): 三态驱动电路
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申请号: US969269申请日: 1978-12-14
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公开(公告)号: US4280065A公开(公告)日: 1981-07-21
- 发明人: Osamu Minato , Toshiaki Masuhara , Toshio Sasaki , Masaharu Kubo
- 申请人: Osamu Minato , Toshiaki Masuhara , Toshio Sasaki , Masaharu Kubo
- 申请人地址: JPX Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX52-155570 19771226
- 主分类号: H03K19/0175
- IPC分类号: H03K19/0175 ; H03K5/02 ; H03K19/082 ; H03K19/094 ; H03K19/0944 ; H03K19/0948 ; H03K3/01 ; H03K19/08
摘要:
This invention relates to a tri-state type driver circuit in which any one of the three possible output signals of "float", "on", or "off" is produced at high speed even when an output terminal is accompanied with a great load. The tri-state type driver circuit comprises an output inverter circuit which employs a bipolar transistor as a load thereof and a MOS-FET as a driver thereof, a first logical circuit which is coupled to an input terminal of the bipolar transistor, which first logical circuit is made up of a C-MOS circuit receiving an external select signal and a C-MOS circuit having an input signal transmitted thereto and whose output can be specified by the external select signal, and a second logical circuit which is coupled to an input terminal of the MOS-FET, which second logical circuit is made up of a C-MOS circuit receiving the external select signal and a C-MOS circuit having the input signal transmitted thereto. The state of the external select signal will determine whether the driver circuit output will be "float" (regardless of the input to the driver circuit) or "on" or "off" (in correspondence with the input to the driver circuit).