US5036227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Row address strobe signal input buffer for preventing latch-up
Assignee: Samsung Electronics Co Ltd
•
Filing: 1990-02-27
•
Granted: 1991-07-30
•
Expires: 2010-02-27
Abstract
Abstract The row address strobe signal input buffer, or "chain pre-charge" circuit, includes a pad receiving a row address strobe signal ( &upbar& R). A Schmitt trigger receives the &upbar& R signal from the pad, and is responsive to a start-up signal. A control section responds to the start-up signal and the output thereof is connected to the output of the Schmitt trigger. A NAND gate and inverters are connected to the output of the control section. A first pre-charge circuit, connected between the pad and the Schmitt trigger, prevents a floating state at the time of initial power source voltage supply. A second pre-charge circuit, connected to an input of one of the inverters which provides the output of the row address strobe signal input buffer, also helps prevent the floating state.
Inventors
- 👤 Sooin Jo
- 👤 Jaiwhan Yu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:53
CPC Classifications
G; G06; G06F; G06F1/00; H; H03; H03K; H03K17/00; H03K17/22; H03K3/00; H03K3/02; H03K3/353; H03K3/356; H03K3/3565
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
A row address strobe signal input buffer comprising: a pad receiving an input row address strobe signal; a Schmitt trigger means connected to receive said row address strobe signal from said pad, and responsive to a start-up signal; a control section responsive to said start-up signal, and connected to an output of said Schmitt trigger means; a NAND gate and inverters connected to an output of said control section; a first pre-charge means for preventing a floating state at the time of power source voltage supply, said first pre-charge means being connected between said pad and said Schmitt trigger; and a second pre-charge means for preventing a floating state connected to an input of one of said inverters which provides an output of the row address strobe signal input buffer.
Claim 2
Dependent Claim
130 words
A row address strobe signal input buffer comprising: a pad receiving an input row address strobe signal; a Schmitt trigger means connected to receive said row address strobe signal from said pad, and responsive to a start-up signal; a control section responsive to said start-up signal, and connected to an output of said Schmitt trigger means; a NAND gate and inverters connected to an output of said control section; a first pre-charge means for preventing a floating state at the time of power source voltage supply, said first pre-charge means being connected between said pad and said Schmitt trigger; and a second pre-charge means for preventing a floating state connected to an input of one of said inverters which provides an output of the row address strobe signal input buffer.
Claim 3
Dependent Claim
40 words
A buffer according to claim 1, wherein said first pre-charge means includes a MOS transistor which operates as a resistance to limit a current level between a power source voltage and said pad for receiving a row address strobe signal.
Claim 4
Dependent Claim
37 words
A buffer according to claim 1, wherein said second pre-charge means includes a MOS transistor which operates as a resistance to limit a current level between a power source voltage and said said one of said inverters.
Claim 5
Dependent Claim
30 words
A buffer according to claim 1, further comprising a third pre-charge means which operates as a resistance, said third pre-charge means being connected to one end of said NAND gate.
Claim 6
Dependent Claim
47 words
A buffer according to claim 4, wherein each of the pre-charge means comprises a MOS transistor, and the size of the MOS transistor of said first pre-charge means is larger and exhibits a larger loading capacitance than the MOS transistors of said second and third pre-charge means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |