EP0405871A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Balanced capacitance lead frame for integrated circuits
Assignee: Texas Instruments Inc
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Filing: 1990-06-25
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Granted: —
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Expires: 2010-06-25
Abstract
Abstract A lead frame (10) is connected over an integrated circuit (40) by adhesives (42) and (44). Each lead conductor (36) and (38) of the lead frame (10) has the identical geometric area in order to provide identical capacitances. A metal shield may be provided on adhesives (42) and (44) to provide noise shielding for the integrated circuit (40).
Inventors
- 👤 Michael A. Lamson
- 👤 Katherine G. Heinen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 15:50
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/40; H10W70/411; H10W70/415; H10W99/00; H10W42/00; H10W42/20; H10W72/00; H10W72/071; H10W72/073; H10W72/50; H10W72/551; H10W72/552; H10W72/5522; H10W72/59; H10W72/851; H10W72/853; H10W72/865; H10W72/90; H10W72/941; H10W72/944; H10W72/9445; H10W74/00; H10W90/00; H10W90/701; H10W90/731; H10W90/736; H10W90/751; H10W90/756
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
68 words
A lead frame for integrated circuitry comprising: a plurality of elongated conductive leads extending in a side-by-side relationship, first ends of said leads dimensioned to be connected to an integrated circuit and second ends of said leads dimensioned to provide electric connections to external circuits; the geometrical area of each of said leads being substantially identical such that the capacitance of each of said leads is substantially identical.
Claim 2
Dependent Claim
68 words
A lead frame for integrated circuitry comprising: a plurality of elongated conductive leads extending in a side-by-side relationship, first ends of said leads dimensioned to be connected to an integrated circuit and second ends of said leads dimensioned to provide electric connections to external circuits; the geometrical area of each of said leads being substantially identical such that the capacitance of each of said leads is substantially identical.
Claim 3
Dependent Claim
30 words
The lead frame of Claim 1 wherein each of said conductive leads has a trapezoidal configuration, the geometric area of said trapezoidal configuration of each said lead being substantially identical.
Claim 4
Dependent Claim
26 words
The lead frame of Claim 2 wherein said trapezoidal configuration of each said lead is disposed between said first and second ends of each said lead.
Claim 5
Dependent Claim
67 words
The lead frame of Claim 3 and further comprising: an elongated power bus having a-central portion disposed normally to said conductive leads and further having end portions which extend in a side-by-side relationship to said conductive leads, said power bus end portions having substantially identical geometric areas as said conductive leads to act as false neighboring leads to maintain equal capacitance for all of said conductive leads.
Claim 6
Dependent Claim
75 words
The lead frame of Claim 1 and further comprising: an elongated power bus having a central portion extending normally of said conductive leads and spaced from said first ends of said leads; an extension from said power bus extending between two groups of said leads in a side-by-side relationship to said leads; said extension having substantially identical geometric areas as said leads to act as false neighboring leads to maintain equal capacitance for said leads.
Claim 7
Dependent Claim
28 words
The lead frame of Claim 1 wherein said conductive leads have an angled mid portion, ones of said conductive leads angled away from others of said conductive leads.
Claim 8
Dependent Claim
28 words
The lead frame of Claim 6 wherein said angled mid-portion of said conductive leads forms trapezoidal areas, said trapezoidal areas of all said conductive leads being substantially identical.
Claim 9
Dependent Claim
72 words
A lead frame comprising: a sheet of conductive material: openings through said sheet to define two groups of conductive leads separated by at least one power bus; each group of conductive leads including a plurality of elongated leads extending in a side-by-side relationship normally to said power bus; and the geometrical area of each of said leads being substantially identical such that the capacitance of each of said leads is substantially identical.
Claim 10
Dependent Claim
72 words
A lead frame comprising: a sheet of conductive material: openings through said sheet to define two groups of conductive leads separated by at least one power bus; each group of conductive leads including a plurality of elongated leads extending in a side-by-side relationship normally to said power bus; and the geometrical area of each of said leads being substantially identical such that the capacitance of each of said leads is substantially identical.
Claim 11
Dependent Claim
22 words
The claim of Claim 8 wherein the middle portion of each of said leads has a trapezoidal configuration of identical geometric area.
Claim 12
Dependent Claim
37 words
The claim of Claim 8 wherein said power bus includes end portions oriented in a side-by-side relationship to one of said groups of conductive leads, said end portions having substantially identical geometric areas as said conductive leads.
Claim 13
Dependent Claim
61 words
The claim of Claim 8 wherein said power bus includes an extension disposed in the middle region thereof, said extension extending normally from said bus between ones of said conductive leads in a side-by-side relationship, said extension having substantially the same geometric area as said conductive leads to act as a dummy lead to insure equal capacitance of said conductive leads.
Claim 14
Dependent Claim
32 words
The claim of Claim 11 wherein said extension has a Y shaped configuration, each leg of said Y shaped configuration having the same geometric area as corresponding portions of adjacent conductive leads.
Claim 15
Dependent Claim
83 words
A lead frame for connection to an integrated circuit comprising: a pair of parallel elongated conductive buses; first and second groups of conductive leads arranged on opposite sides of said power buses, each said group extending normally away from said power buses; said conductive leads in each said group being arranged in a side-by-side relationship along the length of said power buses; the area of each of said conductive leads being substantially identical such that the capacitance of said leads is substantially identical.
Claim 16
Dependent Claim
83 words
A lead frame for connection to an integrated circuit comprising: a pair of parallel elongated conductive buses; first and second groups of conductive leads arranged on opposite sides of said power buses, each said group extending normally away from said power buses; said conductive leads in each said group being arranged in a side-by-side relationship along the length of said power buses; the area of each of said conductive leads being substantially identical such that the capacitance of said leads is substantially identical.
Claim 17
Dependent Claim
43 words
The apparatus of Claim 13 wherein said integrated circuit is disposed beneath and supports said lead frame, connecting wires electrically connecting areas of said integrated circuit to ones of said power buses and said conductive leads to form an active integrated circuit device.
Claim 18
Dependent Claim
19 words
The apparatus of Claim 13 wherein said integrated circuit is separated from said lead frame by a nonconductive layer.
Claim 19
Dependent Claim
20 words
The apparatus of Claim 15 wherein said nonconductive layer includes adhesive to bond said lead frame and said integrated circuit.
Claim 20
Dependent Claim
25 words
The apparatus of Claim 16 and further comprising a conductive layer over said nonconductive layer to act as a noise shield to said integrated circuit.
Claim 21
Dependent Claim
29 words
The apparatus of Claim 17 wherein each of said conductive leads has a trapezoidal configuration, the geometric area of said trapezoidal configuration of each said lead being substantially identical.
Claim 22
Dependent Claim
32 words
The apparatus of claim 13 wherein each of said power buses includes end portions which extend generally normally to the central said power buses and which lie side-by-side with said conductive leads.
Claim 23
Dependent Claim
52 words
The apparatus of Claim 13 wherein each of said power buses includes a false lead extension which extends normally from the center of said power buses between ones of said conductive leads, said extension having a Y configuration with leg portions having substantially identical areas as Corresponding portions of adjacent conductive leads.
Claim 24
Dependent Claim
59 words
The lead frame of Claim 13 wherein each of said conductive leads includes a first end portion adjacent and normal to one of said power buses; and each of said conductive leads further including a central portion angled from normal and further including a second end portion remote from said power buses and extending normally to said power buses.
Claim 25
Dependent Claim
45 words
The lead frame of Claim 21 wherein said central positions of said conductive leads have a trapezoidal configuration, the trapezoidal bases of each of said conductive leads being equal in length to ensure said trapezoidal configuration of each conductive lead is substantially equal in area.
Claim 26
Dependent Claim
37 words
The lead frame of Claim 21 wherein said central portions of one-half of said first and second groups of conductive leads extend at diverging angles to the remaining one-half of said conductive leads in each said group.
Claim 27
Dependent Claim
43 words
An integrated circuit device comprising: an integrated circuit encapsulated in an insulating package; conductive leads extending from connections to portions of said integrated circuit to external of said package; each of said conductive leads having substantially identical capacitance as the remaining conductive leads.
Claim 28
Dependent Claim
43 words
An integrated circuit device comprising: an integrated circuit encapsulated in an insulating package; conductive leads extending from connections to portions of said integrated circuit to external of said package; each of said conductive leads having substantially identical capacitance as the remaining conductive leads.
Claim 29
Dependent Claim
49 words
The integrated circuit device of Claim 24 and further comprising: at least one power bus extending adjacent said integrated circuit and said conductive leads; said power bus including extensions oriented adjacent said conductive leads to act as false leads to maintain equal capacitance of each of said conductive leads.
Claim 30
Dependent Claim
39 words
The integrated circuit device of Claim 24 and further comprising: an insulating layer disposed between said integrated circuit and said conductive leads; and a conductive layer disposed on said insulating layer to provide noise shielding to said integrated circuit.
Claim 31
Dependent Claim
76 words
An integrated circuit device comprising: an integrated circuit; a lead frame for being disposed adjacent an active side of said integrated circuit; connecting wires interconnecting portions of said integrated circuit to portions of said lead frame; said lead frame including a plurality of conductive leads arrayed in a side-by-side relationship along at least one side of said integrated circuit; said conductive leads having substantially identical geometric areas to provide substantially identical capacitances to said integrated circuit.
Claim 32
Dependent Claim
76 words
An integrated circuit device comprising: an integrated circuit; a lead frame for being disposed adjacent an active side of said integrated circuit; connecting wires interconnecting portions of said integrated circuit to portions of said lead frame; said lead frame including a plurality of conductive leads arrayed in a side-by-side relationship along at least one side of said integrated circuit; said conductive leads having substantially identical geometric areas to provide substantially identical capacitances to said integrated circuit.
Claim 33
Dependent Claim
17 words
The integrated circuit device of Claim 27 wherein said integrated circuit comprises a dynamic random access memory.
Claim 34
Dependent Claim
33 words
The integrated circuit device of Claim 27 wherein each of said conductive leads has an angled portion which defines a trapezoid, the areas of the trapezoids of said conductive leads being substantially identical.
Claim 35
Dependent Claim
49 words
The integrated circuit device of Claim 27 and further comprising at least one power bus extending substantially along the length of said integrated circuit, said power bus including false lead extensions which lie adjacent ones of said conductive leads to ensure that said conductive leads have substantially identical capacitances.
Claim 36
Dependent Claim
20 words
The integrated circuit device of Claim 30 wherein said false lead extension comprises the end portions of said power bus.
Claim 37
Dependent Claim
21 words
The integrated circuit device of Claim 30 wherein said false lead extension comprises a centrally located extension from said power bus.
Claim 38
Dependent Claim
35 words
The integrated circuit device of Claim 32 wherein said centrally located extension has a Y configuration, each leg of said configuration having a substantially identical area as the corresponding area of a neighbor conductive lead.
Claim 39
Dependent Claim
22 words
The integrated circuit device of Claim 27 wherein ones of said conductive leads are angled away from others of said conductive leads.
Claim 40
Dependent Claim
26 words
The integrated circuit device of Claim 27 and further comprising a conductive shield formed between said integrated circuit and said lead frame to provide noise shielding.
References Cited (Backward Citations)
No citation records indexed.
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