Invention Grant
- Patent Title: Voltage stress tolerant high speed memory driver having flying capacitor circuit
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Application No.: US15342974Application Date: 2016-11-03
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Publication No.: US09754646B1Publication Date: 2017-09-05
- Inventor: Vinod Kumar , Tara Vishin , Sachin Ramesh Gugwad , Thomas Evan Wilson
- Applicant: Cadence Design Systems, Inc.
- Applicant Address: US CA San Jose
- Assignee: Cadence Design Systems, Inc.
- Current Assignee: Cadence Design Systems, Inc.
- Current Assignee Address: US CA San Jose
- Agency: Schwegman Lundberg & Woessner, P.A.
- Main IPC: G11C7/12
- IPC: G11C7/12 ; G11C7/10 ; G11C7/22

Abstract:
Embodiments relate to circuits, electronic design automation (EDA) circuit layouts, systems, methods, and computer readable media to enable logic devices operating on a core supply voltage to drive memory devices operating on a different supply voltage using low power and high data rates while avoiding voltage over-stress of thin-oxide transistors. In an embodiment, channels of a thin-oxide PMOS transistor, a thick-oxide PMOS transistor, a thick-oxide NMOS transistor, and a thin-oxide NMOS transistor are coupled in order from a memory device voltage supply rail to a low voltage supply rail. Gates of the thin-oxide PMOS transistor and the thick-oxide NMOS transistor are coupled with an output of a flying capacitor circuit that level-shifts an input signal by a difference between the memory device supply and core supply voltages, while gates of the thick-oxide PMOS transistor and the thin-oxide NMOS transistor receive the input signal via a buffer.
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