Slew rate controlling method and system for output data

A slew rate controlling system for output data, said system comprising:

• a potential difference detecting means to detect a decrease in a potential difference between a first power supply and a second power supply, to produce a first signal with specified timing, and to detect an increase in the potential difference between said first power supply and said second power supply, to produce a second signal with the specified timing;
• and
• a slew rate controlling means to exert, when said first signal is significant, control so as to enlarge a transition speed occurring at a time of a fall of output data, and, when said second signal is significant, control so as to enlarge a transition speed occurring at a time of a rise of output data, to produce output data,
• wherein said slew rate controlling means comprises a driver means to exert, when said first signal is significant, control so as to enlarge a transition speed occurring at said time of said fall of output data and, when said second signal is significant, so as to enlarge said transition speed occurring at said time of said rise of output data, and to produce first and second output data;
• and an output buffer means to produce a high-level output when both said first and second output data are at a low level, and to produce a low-level output when both said first and second output data are at a high level.

A slew rate controlling system for output data, said system comprising:

• a potential difference detecting circuit to detect a decrease in a potential difference between a first power supply and a second power supply to produce a first signal with specified timing, and to detect an increase in the potential difference between said first power supply and said second power supply to produce a second signal with the specified timing;
• and
• a slew rate controlling circuit to exert, when said first signal is significant, control so as to enlarge a transition speed occurring at time of a fall of output data, and, when said second signal is significant, control so as to enlarge a transition speed occurring at time of a rise of output data, to produce output data,
• wherein said potential difference detecting circuit comprises a first signaling circuit to produce said first signal with said specified timing when the potential difference between said first power supply and said second power supply becomes a preset value or less, and a second signaling circuit to produce said second signal with the specified timing when the potential difference between said first power supply and said second power supply becomes said preset value or more.

A slew rate controlling system for output data, said system comprising:

• a potential difference detecting circuit to detect a decrease in a potential difference between a first power supply and a second power supply to produce a first signal with specified timing, and to detect an increase in the potential difference between said first power supply and said second power supply to produce a second signal with the specified timing;
• and
• a slew rate controlling circuit to exert, when said first signal is significant, control so as to enlarge a transition speed occurring at a time of a fall of output data, and, when said second signal is significant, control so as to enlarge a transition speed occurring at time of a rise of output data, to produce output data,
• wherein said slew rate controlling circuit comprises a driver circuit to exert, when said first signal is significant, control so as to enlarge a transition speed occurring at said time of said fall of output data and, when said second signal is significant, so as to enlarge said transition speed occurring at said time of said rise of output data, and to produce first and second output data;
• and an output buffer circuit to produce a high-level output when both said first and second output data are at a low level, and to produce a low-level output when both said first and second output data are at a high level.

A slew rate controlling method for output data, said system comprising:

• detecting a decrease in a potential difference between a first power supply and a second power supply to produce a first signal with specified timing when the potential difference between said first power supply and said second power supply becomes a preset value or less;
• detecting an increase in the potential difference between said first power supply and said second power supply to produce a second signal with the specified timing when the potential difference between said first power supply and said second power supply becomes said preset value or more;
• when said first signal is significant, exerting control so as to enlarge a transition speed occurring at time of a fall of output data, to produce output data;
• and
• when said second signal is significant, exerting control so as to enlarge a transition speed occurring at time of a rise of output data, to produce output data.