JPH05144252A - Memory ic - Google Patents

Abstract

PURPOSE:To obtain a memory IC which can comply, even in terms of an interface, with a situation that many power supplies for a system are intermingled. CONSTITUTION:Selectors 6, 7 and a reference-voltage generation circuit 8 are provided at the inside of a memory IC 1. Outputs of the selectors 6, 7 are selected form the outside. Thereby, power-supply voltages of an input part 3 and an I/O part 4 can be decided. It is possible to obtain the memory IC which complies with a situation that power supplies for a system are intermingled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a memory IC suitable for a system having mixed power supply voltages.

[0002]

2. Description of the Related Art FIG. 2 is a diagram showing a conventional memory IC. Reference numeral 1 is a memory IC, 2 is a memory array section including a memory array and a sense amplifier necessary for the periphery thereof, 3 is an address-related input section, 4 is a data I / O section, and 5 is a power supply terminal. Note that V _CC indicates a power supply voltage.

The conventional IC memory 1 is configured as described above, and when address information is input to the input unit 3, data is input to the I / O unit 4 or I / O is input according to the content of the address information.
Output data will be output from the unit 4. The power supply voltage V _CC of the IC memory 1 at this time is applied from the power supply terminal 5, in the internal memory IC1, the power supply voltage V _CC is each block, i.e. the input unit 3, the memory array unit 2, I / O section 4 is supplied.

[0004]

The conventional memory IC as described above has a problem that only a single power supply can cope with the mixed power supply voltage in the system in the future.

The present invention has been made to solve the above problems, and an object thereof is to obtain a memory IC in which an internal power supply voltage can be freely set by setting a selector terminal from the outside. And

[0006]

Means for Solving the Problems A memory IC according to the present invention
Is a reference voltage generation circuit that receives an external power supply voltage and generates a reference voltage for the memory array section, and the reference voltage and the external power supply voltage from the reference voltage generation circuit are input to receive a selection signal from the outside. A selector for switching the output is provided.

[0007]

In the present invention, the external power supply voltage is converted into the reference voltage by the reference voltage generating circuit, and the external power supply voltage or the reference voltage is output through the selector whose output is selected by the selection signal from the outside.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 to 5 are the same as the conventional memory IC. Reference numerals 6 and 7 are selectors for receiving a selection signal from the outside to select the power supply voltage of each block, 8 is a reference voltage generation circuit for supplying the power supply voltage V _CC to the memory array section 2, and 9 , 10 are selector input terminals for controlling the selectors 6, 7.

That is, in the memory IC of the present embodiment having such a configuration, the internal reference voltage generation circuit 8 generates the reference voltage V _CC lower than the external power supply and supplies it to the memory array section 2 for operation. Because of the configuration, it is possible to reduce the circuit current. In addition, it is possible to select four combinations of outputs of the selectors 6 and 7 according to selection signals input to the selector input terminals 9 and 10.
For example, when the selectors 6 and 7 both select the A side,
The power supplies of the input unit 3 and the I / O unit 4 are connected to the internal reference voltage, and at this time, the same power supply is used in the memory IC1. When both the selectors 6 and 7 are connected to the B side, the input section 3 and the I / O section 4 serve as the same external power source, and only the memory array section 2 serves as the internal reference voltage. When the selectors 6 and 7 exclusively select A and B, respectively, the input unit 3 and the memory I / O unit 4 operate with different power supplies. The basic operation of the memory IC1 is the same as that of the conventional IC, and the I / O unit 4 is
If two power supplies are used in the system that inputs and outputs the data, the input unit 3,
The power source of the I / O unit 4 can be selected.

Although the above embodiment has been described with two power supply voltages, the number of power supplies is not limited to this, and a similar concept may be applied to the case of a plurality of power supplies, and the same effect as the above embodiment can be obtained.

[0011]

As described above, the present invention provides a reference voltage generating circuit which receives an external power supply voltage and generates a reference voltage for a memory array section, and a reference voltage and an external power supply voltage from the reference voltage generation circuit. Since a selector for inputting and is input and receiving a selection signal from the outside to switch the output is provided, it is possible to easily realize an IC interface compatible with multiple power supplies of the system, and further, it is possible to achieve low power consumption inside the memory IC. is there.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a memory IC of the present invention.

FIG. 2 is a configuration diagram showing a conventional memory IC.

[Explanation of symbols]

 1 Memory IC 2 Memory Array Section 3 Input Section 4 I / O Section 5 Power Supply Terminal 6 Selector 7 Selector 8 Reference Voltage Generation Circuit 9 Selector Input Terminal 10 Selector Input Terminal

Claims (1)

[Claims] 1. A memory array unit for storing data,
A memory having an address input section for inputting an address for specifying a memory for reading and writing data in the memory array section and a data I / O section for inputting / outputting data to / from the memory array section IC
, A reference voltage generating circuit that receives an external power supply voltage to generate a reference voltage for the memory array section, a reference voltage from the reference voltage generation circuit and the external power supply voltage are input, and a selection signal from the outside is input. A memory IC having a selector for receiving and switching the output.