US4025908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamic array with clamped bootstrap static input/output circuitry
Assignee: International Business Machines Corp
•
Filing: 1975-06-24
•
Granted: 1977-05-24
•
Expires: 1995-06-24
Abstract
Abstract A read only memory is organized as a matrix of field effect transistors wherein logic levels are determined by the presence or absence of a gate which permits transistor action. The memory is addressed using a gate decode tree which selects the gates of a column of matrix devices and a source decode tree which selects the source lines of a row of matrix devices. Sensing of the logic level at a selected location is accomplished by a change of state output sense circuit which dynamically senses and provides a static output using a polarity hold circuit. Clamped, boot-strapped inverter circuits are provided in both input and output circuitry to maintain voltage, at selected internal nodes at a voltage intermediate predetermined minimum and maximum values.
Inventors
- 👤 Ronald Lyle DeRemer
- 👤 Dale Arthur Heuer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:13
CPC Classifications
G; G11; G11C; G11C17/00; G11C17/08; G11C17/10; G11C17/12; G11C11/00; G11C11/21; G11C11/44; G11C5/00; G11C5/02; G11C5/025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
203 words
A solid state read only memory unit comprising; a plurality of bit locations arranged as a matrix of rows and columns of field effect transistor (FET) devices wherein a first logic level is indicated when a gate connection is present and a second logic level is indicated when a gate connection is absent and wherein each FET device includes first and second electrodes connected to the source and drain thereof and a gate which may enable transistor action when a gate connection is present; first addressing means for addressing a selected column of said matrix of FET devices; second addressing means for addressing a selected row of said matrix of FET devices; said first addressing means and said second addressing means cooperating to identify a selected matrix bit location at the intersection of said selected column and said selected row; clocked sensing means including a dynamic NAND circuit which senses a plurality of array drain lines during each memory cycle for sensing the logic level at said selected matrix bit location; and static output latch means which is conditioned by said clocked sensing means and retains the logic level sensed at said selected matrix bit location until reset during a subsequent memory cycle.
Claim 2
Dependent Claim
203 words
A solid state read only memory unit comprising; a plurality of bit locations arranged as a matrix of rows and columns of field effect transistor (FET) devices wherein a first logic level is indicated when a gate connection is present and a second logic level is indicated when a gate connection is absent and wherein each FET device includes first and second electrodes connected to the source and drain thereof and a gate which may enable transistor action when a gate connection is present; first addressing means for addressing a selected column of said matrix of FET devices; second addressing means for addressing a selected row of said matrix of FET devices; said first addressing means and said second addressing means cooperating to identify a selected matrix bit location at the intersection of said selected column and said selected row; clocked sensing means including a dynamic NAND circuit which senses a plurality of array drain lines during each memory cycle for sensing the logic level at said selected matrix bit location; and static output latch means which is conditioned by said clocked sensing means and retains the logic level sensed at said selected matrix bit location until reset during a subsequent memory cycle.
Claim 3
Dependent Claim
28 words
The solid state read only memory unit of claim 1 wherein said static output latch means comprises a polarity hold circuit dynamically conditioned by said clocked sensing means.
Claim 4
Dependent Claim
35 words
The solid state read only memory unit of claim 2 wherein said clocked sensing means further includes a collection NOR for sensing the output from a plurality of dynamic NAND circuits during each memory cycle.
Claim 5
Dependent Claim
87 words
The solid state read only memory unit of claim 2 wherein said static output sense latch means further comprises a clamped, boot-strapped predriver including a first voltage; a first FET having an output electrode, a second electrode connected to said first voltage and a gate electrode; capacitor means connected between said first FET gate electrode and output electrode; first switch means connected to said first voltage and said first FET gate electrode; and voltage clamping circuit means interconnecting said first voltage and said first FET gate electrode.
Claim 6
Dependent Claim
72 words
The solid state read only memory unit of claim 4 wherein said first switch means comprises a second FET device having the gate and drain thereof connected to said first voltage and the source connected to said first FET gate electrode and said voltage clamping circuit means comprises a third FET having the source connected to said first voltage and the gate and drain thereof connected to said first FET gate electrode.
Claim 7
Dependent Claim
82 words
A field effect transistor (FET) driver circuit comprising a voltage and current source a first FET having an output electrode, a second electrode connected to said voltage and current source and a gate electrode; capacitor means connected between said first FET gate electrode and output electrode; a first switch means connected to said voltage and current source and said first FET gate electrode; and voltage clamping circuit means interconnecting said source of voltage and current source and said first FET gate electrode.
Claim 8
Dependent Claim
82 words
A field effect transistor (FET) driver circuit comprising a voltage and current source a first FET having an output electrode, a second electrode connected to said voltage and current source and a gate electrode; capacitor means connected between said first FET gate electrode and output electrode; a first switch means connected to said voltage and current source and said first FET gate electrode; and voltage clamping circuit means interconnecting said source of voltage and current source and said first FET gate electrode.
Claim 9
Dependent Claim
43 words
The field effect transistor drive circuit of claim 6 wherein said voltage clamping circuit means comprises a second FET device having the source connected to said voltage and current source and the gate and drain thereof connected to said first FET gate electrode.
Claim 10
Dependent Claim
42 words
The field effect transistor driver circuit of claim 7 wherein said first switch means comprises a third FET device having the gate and drain thereof connected to said voltage and current source and the source connected to said first FET gate electrode.
References Cited (Backward Citations)
US3691535A
Cited
US3810124A
Cited
US3851313A
Cited
US3892984A
Cited
US3892984B1
Cited
US3876993A
Cited
US3924247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |