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公开(公告)号：EP1989780A1
公开(公告)日：2008-11-12
申请号：EP07704566.4
申请日：2007-02-13
发明人： JUNGERT, Horst , ELMER, Werner
IPC分类号： H03K19/173 , H03K17/00
CPC分类号： H03K19/1732 , H03K17/005
摘要： An integrated circuit can be switched between operating modes without the need for a dedicated mode selection pin. A circuit for operation at a specified maximum supply voltage comprises first (DVDD) and second (DVSS) supply- terminals, a first signal input (inputl) for application of a regular input signal, a second signal input (input2), and an output. The circuit further comprises a multiplexer (Mux)with first and second inputs connected to the first and second singnal output. The control circuitry detects a voltage at the first signal input that exceeds the specified maximum supply voltage by a given amount and, in response, applies a drive signal to the input of the gate circuit. With such a circuit design, a relatively high voltage applied to the first signal input will switch the circuit to another operating mode, such as a test mode.
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公开(公告)号：EP1989780B1
公开(公告)日：2010-01-20
申请号：EP07704566.4
申请日：2007-02-13
发明人： JUNGERT, Horst , ELMER, Werner
IPC分类号： H03K19/173 , H03K17/00
CPC分类号： H03K19/1732 , H03K17/005
摘要： An integrated circuit can be switched between operating modes without the need for a dedicated mode selection pin. A circuit for operation at a specified maximum supply voltage comprises first (DVDD) and second (DVSS) supply- terminals, a first signal input (inputl) for application of a regular input signal, a second signal input (input2), and an output. The circuit further comprises a multiplexer (Mux)with first and second inputs connected to the first and second singnal output. The control circuitry detects a voltage at the first signal input that exceeds the specified maximum supply voltage by a given amount and, in response, applies a drive signal to the input of the gate circuit. With such a circuit design, a relatively high voltage applied to the first signal input will switch the circuit to another operating mode, such as a test mode.
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