Semiconductor integrated circuit allowing internal voltage to be measured and controlled externally
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsAkira Hosogane, Yoshitsugu Dohi, Hiroaki Nakai, Tatsuya Saeki
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Abstract
An internal voltage from an internal voltage generating circuit is transmitted to a pad in accordance with a control signal, and a buffer circuit coupled to the pad is set in an inactive state. The pad is connected to an external pin terminal via a bonding wire. Consequently, a semiconductor integrated circuit capable of monitoring and forcedly setting an internal voltage from an outside of the circuit device is realized with a minimum number of pin terminals without increasing the number of external pin terminals.
Claims26
A semiconductor integrated circuit receiving a first power supply voltage and a second power supply voltage externally applied for operation, comprising:
- an internal voltage generating circuit for generating at least one internal voltage different in voltage level from the first and second power supply voltages;
- a buffer circuit coupled to a pad;
- and
- a switching circuit for inactivating said buffer circuit and coupling said internal voltage generating circuit to said pad in response to a control signal.
A semiconductor integrated circuit receiving first and second power supply voltages externally applied for operation, comprising:
- an internal voltage generating circuit for generating at least one internal voltage different in voltage level from the first and second power supply voltages;
- an internal voltage transmission line for transmitting the internal voltage;
- a switching circuit for isolating said internal voltage transmission line and said internal voltage generating circuit from each other in accordance with a control signal and connecting said internal voltage transmission line to a pad;
- and
- a buffer circuit coupled to said pad and made inactive in response to said control signal and having an output signal fixed to a voltage of a predetermined logic level when made inactive.
Dependencies are inferred from the claim text.