JPH0573272B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to integrated circuit storage devices, and more particularly to the arrangement of power and ground potential pads and output circuits thereof.

[Conventional technology]

Conventionally, storage devices using semiconductor integrated circuits are
As shown in the figure, when assembled into a DIP (dual in-line package) 30, the very end pin was often set to the power pin 31, so the power pad 32 was set for easy connection to the power pin. It was customary to place it in the center of the four sides. FIG. 4 is a plan view showing an example of the arrangement of the power supply pad, ground potential pad, and each circuit of the pellet.
The power supply pad 41 and the installed potential pad 42 are installed at the center of each of the opposing long sides, and power supply wires 43, 44 and ground wires 45, 46 are drawn out from each side to the left and right and extended along the four sides, and output to these. Circuits 49 ₁ and 49 2 are connected to circuits other than the circuits _{47 1} to 47 ₄ , 48 ₁ to 48 ₄ and the output circuit. FIG. 5 shows another conventional example, in which power supply pads 51 and 52 and ground potential pads 53 and 54 are each divided into two parts.
are arranged at the center of the long side and short side, respectively, and have power supply lines 55, 56 for the output circuit, power supply lines 57, 58 for circuits other than the output circuit, and ground lines 59, 60, 61, 62 corresponding to each other. Output circuits 63 ₁ to 63 ₄ , 64 ₁ to 64 4 and circuits 65 1 and 65 2 other than the output circuits are connected between the output circuits 63 ₁ to 63 4 and 64 1 to 64 4 and circuits 65 ₁ and 65 ₂ other than the output circuits.

[Problem that the invention seeks to solve]

Each output circuit 47 ₁ of the conventional example shown in FIG.
47 ₂ , 47 ₃ , and 47 ₄ , the situation of potential changes occurring at the input points A, B, C, and D of those power sources is shown by curve 1 in FIG. That is, power pad 4
1 and the output circuit 47 ₁ and between each output circuit are R, and the current values input to each of the output circuits 47 ₁ to 47 ₄ are I, then point A The potential change at point B is 4IR, and at point B
7IR (=4IR+3IR), 9IR (=7IR+2IR) at point C,
At point D, it becomes 10IR (=9IR+1IR). The situation of this potential change is the same at each input point of the output circuits 48 ₁ to 48 ₄ . In addition, circuit 4 other than the output circuit
Each output circuit 4 is also affected by the current flowing through 9 ₁ and 49 ₂ .
The input point potentials of 7 ₁ to 47 ₄ , 48 ₁ to 48 ₄ fluctuate, and conversely, the potentials of circuits 49 ₁ and 49 ₂ other than the output circuits also change to the current flowing through the output circuits 47 ₁ to 47 ₄ , 48 ₁ to 48 ₄ fluctuates under the influence of In this way, since all circuits are connected to the same power supply pad, changes in the potential of the power supply line caused by the current flowing in each circuit and the wiring resistance of the power supply line affect the characteristics of all circuits. Furthermore, this change in the potential of the power supply line has a disadvantage in that it has a greater effect on semiconductor integrated circuits having the function of simultaneously reading multi-bit information.

In the conventional example shown _{in FIG} .
Since the circuits ₁ to 64 ₄ and the circuits 65 ₁ and 65 ₂ other than the output circuit are separated, the influence between them is eliminated, but the current value I flowing through the output circuits 63 ₁ to 63 ₄ and the wiring resistance value between the circuits are Each output circuit 63 ₁ to 63 ₄ by R
The situation of potential changes at the input points E, F, G, and H of the power supply is exactly the same as in the previous example and is shown by curve l in Fig. 2, and this is also the same for the output circuits 64 ₁ to 64 ₄ , The disadvantage is that it affects the characteristics of

[Means for solving problems]

An integrated circuit storage device according to the present invention includes a plurality of first output circuits that operate simultaneously with each other, and a plurality of second output circuits that operate simultaneously with each other, but that do not operate simultaneously with the first output circuit. Second
an output circuit, first and second power pads,
first and second ground pads, the plurality of first output circuits being grouped into first and second groups, and the plurality of second output circuits being grouped into third and fourth groups. and a first output circuit in the first group is powered via a first wire extending from the first power pad and a second wire extending from the first ground pad. a first output circuit in the second group and a second output circuit in the third group;
An output circuit is connected from the first power supply pad to the first power supply pad.
a third wiring that extends independently of the wiring;
A second output circuit in the fourth group is arranged to be supplied with power via a fifth wiring extending from the second power supply pad and a fourth wiring extending from the second power supply pad. Power is supplied from the ground pad through a sixth wiring that extends independently of the fourth wiring.

According to this configuration, potential changes based on the operation of the output circuit on each power supply line can be suppressed to a minimum, and the influence on the characteristics can be reduced.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing the circuit layout on a pellet of an embodiment of the integrated circuit memory device of the present invention, and FIG. 2 is a graph showing changes in power supply potential occurring in the power supply lines in this embodiment and the conventional example. It is.

The two power supply pads 1, 2 and the two ground potential pads 3, 4 are arranged at each of the four corners of the pellet and on the same diagonal. Further, it is assumed that the set of four output circuits 13 ₁ to 13 ₄ and the set of other four output circuits 14 ₁ to 14 ₄ do not operate simultaneously. Output circuits 13 ₁ to 13 ₄ are 1
It is divided into groups of 3 ₃ and 13 ₄ and groups of 13 ₁ and 13 ₂ . Similarly, the output circuits 14 ₁ to 1
4 ₄ is also divided into groups of 14 ₁ and 14 ₂ and groups of 14 ₃ and 14 ₄ . Output circuit 13 ₃ , 13 ₄
The groups are supplied with power via a power line 6 extending from the power pad 1 and a ground line 10 extending from the ground potential pad 4. These power line 6 and ground line 10
A circuit 17 other than the output circuit is also connected to. The group of output circuits 13 ₁ , 13 ₂ and the group of output circuits 14 ₁ , 14 ₂ are supplied with power via a power line 5 extending further from the power pad 1 and a ground line 9 extending from the ground potential pad 3. The group of output circuits 14 ₃ and 14 ₄ is supplied with power via a power line 7 extending from the power pad 2 and a ground line 11 further extending from the ground potential pad 3. A circuit 15 other than the output circuit is also connected to the power supply line 7 and the ground line 11. That is, each power supply line 5, 6, 7 has two output circuits (13 ₁ - 13 ₂ or 14 _{1 -} 14 ₂ , 13 ₃ -
13 ₄ , 14 ₃ -14 ₄ ) are connected.

By adopting the above arrangement, changes in the power supply potential in this embodiment can be controlled, for example, at each input point J of each output circuit 13 ₁ , 13 ₂ , 14 ₁ , 14 ₂ on the power supply line 5
Looking at the operation of the output circuits 14 ₁ and 14 ₂ in M, L, and M, the current flowing through each circuit is I, and the power line 5 between each circuit and between the power supply pad 1
The resistance value R is 2IR at point J and 4IR at point K.
(=2IR+2IR), 6IR (=4IR+2IR) at point L, 7IR (=6IR+1IR) at point M, and the curve m in Figure 2.
, which is significantly reduced compared to the curve 1 for the conventional example. Also, regarding the influence on circuits 17 other than the output circuit, the output circuit 1 on the power supply line 6
Looking at the input points N and P of 3 ₃ and 13 ₄ , the second
As shown by curve n in the figure, 2IR at point N and 2IR at point P.
3IR (=2I+1IR), which is a significant improvement compared to the change values at points C and D in the conventional example.

〔Effect of the invention〕

As explained above, the present invention divides a plurality of first output circuits that operate simultaneously with each other into first and second groups, and provides a plurality of second output circuits that operate simultaneously with each other but do not operate simultaneously with the first output circuit. The circuits are divided into third and fourth groups, and the output circuits of the first group are supplied with power by wiring extending from the first power supply pad and the first ground pad, respectively, and the output circuits of the second group and the output circuits of the third group are supplied with power as described above. Power is supplied by wiring extending from the first power supply pad and the second grounding pad, respectively, and power is supplied to the output circuits of the fourth group by wiring extending from the second power supply pad and the second grounding pad, respectively. It reduces potential changes in the power line caused by the current flowing in the circuit and the wiring resistance of the power line, and has the effect of reducing the effect on the characteristics of circuits connected to the same power line. .

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the circuit arrangement on a pellet of an embodiment of the integrated circuit storage device of the present invention, and FIG. 2 is a graph showing changes in power supply potential occurring in the power supply line in this embodiment and the conventional example. FIG. 3 is a diagram showing an example of the arrangement of pellets and lead wires inside a conventional integrated circuit storage device (DIP type), and FIGS. 4 and 5 are plan views showing examples of the arrangement of pellets in a conventional integrated circuit storage device. It is. 1, 2... Power pad, 3, 4... Ground potential pad, 5, 6, 7, 8... Power line, 9, 10, 1
1, 12... Ground wire, 13 ₁ ~ 13 ₄ , 14 ₁ ~ 1
4 ₄ ... Output circuit, 15, 16, 17... Circuit other than the output circuit, J, K, L, M, N, P... Input point of the power supply of the output circuit, l, m, n... Potential change curve.

Claims (1)

[Claims] 1 A plurality of first output circuits that operate simultaneously with each other, a plurality of second output circuits that operate simultaneously with each other but that do not operate simultaneously with the first output circuit, first and second power pads and first and second ground pads, the plurality of first output circuits are grouped into first and second groups, and the plurality of second output circuits are grouped into first and second groups;
output circuits are grouped into third and fourth groups, and a first output circuit in the first group has a first wiring extending from the first power pad and a first wiring extending from the first ground pad. A first output circuit in the second group and a second output circuit in the third group are arranged to be supplied with power via a second wiring, and a first output circuit in the second group and a second output circuit in the third group are connected to the a second output in the fourth group arranged to be supplied with power via a third wire extending independently of the first wire and a fourth wire extending from the second ground pad; The circuit includes a fifth wire extending from the second power supply pad and a sixth wire extending from the second ground pad independently of the fourth wire.
An integrated circuit storage device characterized in that power is supplied through the wiring.