JPS5850768A - Semiconductor ic device - Google Patents

Abstract

PURPOSE:To enable to easily convert the source voltage in a C MOS IC and thus contrive the realization of a system directive to a low power consumption, by changing the mask of wiring members. CONSTITUTION:The group of contact pairs 2-1-2-n is purposed to connect the pad for the power source 1 to supply the source voltage from the outside of the IC to a specific constant-voltage regulated power supply circuit 3-i, and the group of contact pairs 4-1-4-n is purposed to connect the specific constant-voltage regulated power supply circuit 3-i to the power source line 6 of an internal functional block 5. To fit the using purpose of the C MOS IC, the group of contact pairs are kept as follows, that is only a pair of contact pairs 2-i and 4-i before and behind the used constant voltage circuit 3-i in a state of conduction and the other contact pairs all in a state of non-conduction. When the source voltage used in common to the system is supplied from the pad for the power source 1, it is converted into the source voltage fitted to the using purpose by mediating contact pair 2-i, constant-voltage regulated supply circuit 3-i and contact pair 4-i and supplied into the power source line 6 to the internal functional block 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a semiconductor integrated circuit device having a structure in which two or more types of constant voltage power supply circuits built into the same semiconductor substrate can be arbitrarily selected by a group of contact pairs. A complementary MO8 integrated circuit will be described as a useful application example. In recent years, complementary MO has been developed for the purpose of lower power consumption.
Systems using MO8 integrated circuits have come into widespread use, and in general, the current consumption of complementary MO8 integrated circuits is proportional to the power supply voltage and the operating speed limited by the power supply voltage. Therefore, in order to reduce power consumption, it is desired that the power supply voltage and operating speed be as low as possible within the range that achieves the intended use. By the way, in general-purpose integrated circuits such as microcomputers, internal functional circuit blocks are designed to satisfy high-speed specifications in order to ensure high-speed operation within the power supply voltage range specified in the specifications. However, depending on the purpose of use, if a high operating speed is not necessarily required but other low-speed microcomputers are too slow to use, a high-speed microcomputer must be used.

At this time, the power supply voltage commonly used in systems containing integrated circuits is more than sufficient for high-speed integrated circuits, and in fact, even if a lower voltage is applied to the integrated circuit, it still satisfies the purpose of use and consumes less power. It is beneficial in this respect. However, if a special power supply voltage for the integrated circuit is to be realized outside the integrated circuit, an extra power supply must be provided externally.

This invention utilizes two or more types of constant voltage power supply circuits built into a semiconductor substrate in response to a single power supply voltage supplied from the outside of a semiconductor integrated circuit, in the process of manufacturing elements of a semiconductor integrated circuit device (for example, using a metal wiring evaporation hammer). At this stage, wiring members (for example, the metal wiring) are selectively configured using a mask programmable mask, and at least one of the wiring members is appropriately selected depending on the purpose of use, thereby forming internal functional ports and paths of the semiconductor integrated circuit. The purpose is to convert the block power supply voltage to an optimal value and configure a system with less wasted power consumption.

FIG. 1 shows an embodiment of the present invention. FIG. 1 shows that only one of the constant voltage power supply circuit groups 3-1 to 3-n consisting of n types of constant voltage circuits built into the same semiconductor substrate is selected to provide the necessary and sufficient internal function circuit block 5. FIG. 2 is a block diagram of a complementary MO8 integrated circuit that provides a power supply voltage. On the board, in addition to the internal functional circuit block 5 and its power supply line 6 necessary for normal operation, there are constant voltage power supply circuit groups 3-1 to 3-n.
.

Contact pair groups 2-1 to 2-n1 and contact pair groups 4-1 to 4-n
There is. Contact pair groups 2-1 to 2-n are used to connect the power supply pad 1, which supplies power voltage from outside the integrated circuit, to a specific constant voltage power supply circuit 3-i. -1 to 4-n are for connecting a specific constant voltage power supply circuit 3-i to the power supply line 6 of the internal functional block 5. In order to meet the purpose of use of the complementary MO3 integrated circuit, the contact pair group is such that only one contact pair 2-i and 4-i before and after the constant voltage circuit 3-i to be used is in a conductive state, and all other contact pairs are in a conductive state. Leave it in a non-conducting state. Complementary type M from power pad 1
When a power supply voltage commonly used in a system including an O8 integrated circuit is supplied, contact pair 2-1. Constant voltage □ Power supply circuit 3-1. It is converted into a power supply voltage suitable for the purpose of use and supplied to the power supply line 6 of the internal functional circuit block 6 via the contact pair 4-1. At this time, contact pair groups 2-1 to 2-n and 4 are placed before and after constant voltage power supply circuit groups 3-1 to 3-n.
-1 to 4-n eliminates unnecessary power consumption in unused constant voltage power supply circuits (contact pair group 2
-1 to 2-n), and also eliminate the parasitic effect of the internal functional block 6 on the power supply line 6 (contact pair group 4-1
~4-n).

FIG. 2 is a block diagram of a complementary MO8 integrated circuit in which two or more constant voltage power supply circuits are selected from a group of constant voltage power supply circuits built into a semiconductor substrate as necessary. In addition to the configuration shown in FIG. 1, the board includes an interface circuit 7 for transmitting signals from the internal functional block 5 to the outside of the integrated circuit and its power source. Nokurado 1 for power supply
The power supply voltage supplied from contact pair 2-5. Constant voltage power supply circuit 3-5. It is supplied to the power line 6 of the internal functional circuit block 5 through the path of contact pair 4-j, and the power supply square pad 1
to contact pair 2-, to constant voltage power supply circuit 3-, to contact pair 4-
The power line 8 of the interface circuit 7
supplied to Furthermore, in this case, it is also possible to provide a contact pair that directly connects the power supply pad 1 to the power supply line 6 of the internal functional circuit block 5 or the power supply line of the interface circuit 7.

As described above, the present invention makes it possible to easily convert the power supply voltage inside a complementary MO8 integrated circuit by changing the mask of the wiring member, and has a great effect on realizing a system oriented toward low power consumption. It is. Although the above description has been made regarding a complementary MO8 integrated circuit, it is also applicable to general semiconductor integrated circuits.

[Brief explanation of the drawing]

1 and 2 are block diagrams schematically showing a complementary MO8 integrated circuit according to the present invention. 1... Power supply pad, 2-1 to 2-n...
...Contact pair group, 3-1 to 3-n... Constant voltage power supply circuit group, 4-1 to 4-n... Contact pair group, 5...
...Internal functional circuit block, 6... Power line of internal functional block 6, 7... Interface circuit, 74-- 8-... Interface circuit 7 power line. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] (1) Two or more types of constant voltage power supply circuits are provided on the same semiconductor substrate, and integrated between the input section of each of the constant voltage power supply circuits and the external power input terminal, and with the output section of each of the constant voltage power supply circuits. The functional circuit blocks of the circuit are connected to the power supply lines by providing contact pairs that can be selectively connected to each other, and the operating voltage applied to the functional circuit blocks is connected from the constant voltage power supply circuit to the contact pairs. A semiconductor integrated circuit device characterized by being selectively set. (2. A semiconductor integrated circuit device according to claim 1, wherein the contact pairs are configured selectively depending on wiring members.