JPS63155492A - Magnetic bubble memory device - Google Patents

Abstract

PURPOSE:To reduce the number of external connecting terminals of a chip by providing a wiring pattern for connecting each terminal of the chip in a tape carrier. CONSTITUTION:A tape carrier 1 has rectangular opening parts 8, 8' on the outside periphery of a chip loading part, and from the respective two opposed sides of the opening parts 8, 8', leads 4, 4' and 5, 5' from wiring patterns 7, 9 from on the tape carrier are projected, and among the leads, the lead 5 from the chip side of one opening part 8 is connected to the lead 5' of the chip side of the other opening part 8' by a wiring pattern 9 in the tape on the chip, and the leads 4, 4' from the side opposite to the chip pass through the wiring pattern 7 of the outside peripheral part of the chip and are wired to both end parts respectively in the longitudinal direction of the tape carrier 1. A tape is left in a chip mounting part of the tape carrier, and by executing a parallel wiring processing between gates by using its part, the number of terminals can be decreased.

Description

[Detailed Description of the Invention] [Summary] A magnetic bubble memory device that uses a tape carrier to mount a bubble memory chip, in which the tape is also left on the chip mounting part of the tape carrier, and that part is used to connect between gates. The number of terminals can be reduced by performing parallel wiring processing.

[Industrial application field]

The present invention relates to a magnetic bubble memory device used in a storage device such as an electronic computing device, and more particularly to a magnetic bubble memory device using a tape carrier for mounting a bubble memory chip.

A magnetic bubble memory element is produced by forming a thin film of magnetic garnet by liquid phase epitaxial growth on a non-magnetic substrate such as a single crystal of gadolinium, gallium, or garnet.
On top of that, a bubble transfer path is formed with a matrix of half-disk or chevron-type patterns using a soft magnetic thin film such as permalloy, and bubbles generated by a bubble generator according to information are guided to the transfer path. , information is stored as "1" if there is a bubble in the pattern, and "0" if there is no bubble. In order to detect information, a detector is usually constructed using a soft magnetic thin film such as permalloy, and bubbles are detected using the magnetic abrasive effect of the detector.

The density of such magnetic bubble memories has been increased, and 4Mb devices are currently being mass-produced, and 16Mb devices are currently being mass-produced.
Development of 64Mb and 64Mb devices is underway.

However, such high density leads to an increase in access time. As a countermeasure to this problem, the number of bubble detectors is increased by dividing the chip into multiple blocks. However, as the number of blocks increases, the number of gates increases and the number of terminals increases, so terminal processing to reduce this has become a major issue.

[Conventional technology]

In conventional technology, the number of terminals has been reduced by connecting gates of the same type in parallel between blocks using plated wiring, but this has led to an increase in chip size due to plated wiring, or problems with the reliability of the intersection between internal chip wiring and plated wiring. There are problems such as decline.

For this reason, a mounting method using a tape carrier is adopted.

In the conventional mounting method using a tape carrier, as shown in FIG. 2, one opening 2 larger than the chip 3 is provided in the tape carrier 1, and bonding leads 4 are brought out from multiple sides of the opening 2 to connect to the terminals 5 of the chip. Connected.

[Problem that the invention seeks to solve]

In the above-mentioned conventional mounting method using a tape carrier, the number of bonding glues 4 and on-tape wiring 6 is limited, and there is a problem that terminals of a multi-block chip cannot be processed.

The present invention was created in view of these points, and an object of the present invention is to provide a magnetic bubble memory device in which the number of terminals is reduced using a tape carrier.

[Means for solving problems]

Therefore, in the present invention, as illustrated in FIG. 1, in a magnetic bubble memory device using a tape carrier for mounting a bubble memory chip, the tape carrier 1
has at least two rectangular openings 8, 8' on the outer periphery of the chip mounting portion, and wiring patterns 7.8 from above the tape carrier can be seen from two opposing sides of the openings 8.8'.
Leads 4.4' and 5.5' from the opening 9 protrude, and among these leads, the lead 5 from the chip side of one opening 8 is connected to the chip side lead 5' of the other opening 8' on the chip. They are connected by a wiring pattern 9 within the tape, and the glues 4 and 4' from the opposite side of the chip are routed to both ends of the tape carrier 1 in the longitudinal direction through the wiring pattern 7 on the outer periphery of the chip. It is said that

[For production]

By providing the wiring pattern 9 in the tape carrier 1 that connects the terminals 6 of the chip 3 to the same dirt floor, the number of external connection terminals of the chip 3 can be reduced.

〔Example〕

FIG. 1 is a diagram for explaining the present invention in detail.

In this embodiment, as shown in FIG. 1, the tape carrier 1 is provided with at least two rectangular openings 8.8' on the outer periphery of the chip mounting portion, and two or more rectangular openings 8. Leads 4, 4' and 5, 5' for bonding connection to the terminals 6 of the chip 3 are provided protruding from the sides, and among the leads, the lead 5 protruding from the chip direction of one opening 8 is connected to the other. The leads 5' protruding from the chip direction of the openings 8.8' are connected by wiring patterns 9 provided on the tape carrier, and the chips 3 of each opening 8.
Leads 4 and 4' protruding from the opposite direction are respectively wired to both longitudinal ends of the retaining carrier 1 via a wiring pattern 7 provided on the outer periphery of the chip. Chip 3 then connects its terminals 6a to leads 4, 4' and 5 of the tape carrier.
．． 5' is bonded and mounted.

In this embodiment configured in this way, the tape is left also on the chip mounting part of the tape carrier 1, and that part can be used to perform parallel wiring between the gates of the chips, so that the tape is not connected to the outside. The number of terminals can be reduced.

(Effects of the Invention) As described above, according to the present invention, the number of terminals of a magnetic bubble memory device can be reduced with an extremely simple configuration, and is extremely useful in practice.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a magnetic bubble memory device using a conventional mounting method. In Figure 1, ■ is the tape carrier, 3 is the bubble memory chip, 4.4', 5.5' are the leads, 6a is the terminal, 7 is the wiring pattern on the tape, 8.8' is the opening, and 9 is the chip. This is the wiring pattern of the upper tape.

Claims (1)

[Claims] 1. In a magnetic bubble memory device using a tape carrier for mounting a bubble memory chip, the tape carrier (1) has at least two rectangular openings (8, 8') on the outer periphery of the chip mounting portion; Opening (8, 8'
Leads (4, 4') and (5, 5') from the wiring patterns (7, 9) on the tape carrier protrude from two opposing sides of the opening (). The lead (5) from the chip side in 8) is connected to the chip side lead (5') in the other opening (8') with a wiring pattern (9) within the tape on the chip, and the lead (5) from the chip side A magnetic bubble memory device characterized in that the leads (4, 4') are respectively wired to both longitudinal ends of a tape carrier (1) through a wiring pattern (7) on the outer periphery of the chip.