Semiconductor integrated circuit having interface circuit containing pull-up resistor and blocking diode, circuit module including such integrated circuit, and electronic apparatus including such circuit modules

A circuit module comprising:

• a semiconductor integrated circuit having an interface circuit incorporated therein;
• a power supply connected to said semiconductor integrated circuit;
• wherein said interface circuit comprises:
• a signal line;
• a pull-up resistor connected to said power supply line at one terminal thereof;
• and
• a blocking diode having an anode and a cathode which are connected to another terminal of said pull-up resistor and said signal line, respectively.

An electronic apparatus comprising:

• a first circuit module including a first semiconductor integrated circuit having a first interface circuit incorporated therein, and a first power supply line connected to said first semiconductor integrated circuit;
• a second circuit module including a second semiconductor integrated circuit having a second interface circuit, and a second power supply line connected to said second semiconductor integrated circuit;
• and
• a signal line connecting between said first and second interface circuits,
• wherein said first interface circuit includes:
• a first pull-up resistor connected to said first power supply line at one terminal thereof;
• and
• a first blocking diode having an anode and a cathode which are connected to another terminal of said first pull-up resistor and said signal line, respectively, and
• wherein said second interface circuit includes:
• a second pull-up resistor connected to said second power supply line at one terminal thereof;
• and
• a second blocking diode having an anode and a cathode which are connected to another terminal of said second pull-up resistor and said signal line, respectively.