Invention Grant
- Patent Title: SRAM based one-time-programmable memory
- Patent Title (中): 基于SRAM的一次可编程存储器
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Application No.: US12239469Application Date: 2008-09-26
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Publication No.: US07869251B2Publication Date: 2011-01-11
- Inventor: Ramnath Venkatraman , Ruggero Castagnetti , Subramanian Ramesh
- Applicant: Ramnath Venkatraman , Ruggero Castagnetti , Subramanian Ramesh
- Applicant Address: US CA Milpitas
- Assignee: LSI Corporation
- Current Assignee: LSI Corporation
- Current Assignee Address: US CA Milpitas
- Agency: Cochran Freund & Young LLC
- Agent Christopher P. Whitham
- Main IPC: G11C17/00
- IPC: G11C17/00

Abstract:
Disclosed is a method and device for providing fast-response One-Time-Programmable (OTP) memory based on SRAM memory technology and the inherent breakdown characteristics of a MOS transistor. Each memory cell of an SRAM memory cell circuit is connected to a programming circuit. The programming circuit is comprised of two groups of MOS transistors connected to the storage nodes (SN and SNB, where SNB is the complementary value of SN) of the two cross-coupled inverters of the SRAM memory circuit. A desired data set is loaded into the circuit and then is burned-in by applying and repeatedly cycling a “burn-in” voltage across the source and drain of the MOS transistors of the programming circuit that approaches the ON STATE trigger voltage of the characteristic bipolar junction transistor contained within the MOS transistors. Upon repeated cycling of the source-to-drain voltage, the targeted MOS transistor within the programming circuit breaks down and shorts across the gate, drain, and/or source of the transistor. When the system is returned to normal operation, the programming circuits will be connected to ground, Vdd or Vss and one of the two nodes of the SRAM cell circuit will be shorted through the programming circuit to ground, Vdd or Vss, thus, forcing a retention of the programmed data state.
Public/Granted literature
- US20100080035A1 SRAM BASED ONE-TIME-PROGRAMMABLE MEMORY Public/Granted day:2010-04-01
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