公开(公告)号：US10438636B2

公开(公告)日：2019-10-08

申请号：US15834644

申请日：2017-12-07

Applicant: ADVANCED MICRO DEVICES, INC.

Inventor： Tawfik Ahmed ,  Amlan Ghosh ,  Keith A. Kasprak ,  Ricardo Cantu

IPC: G11C7/12 ,  H01L23/522 ,  G11C7/10 ,  G11C5/06

Abstract: Write assist circuitry facilitates increased voltage applied to a memory device such as a memory cell or bitcell in changing a logical state of the memory device during a write operation. The write assist circuitry includes a second capacitive line or “metal cap” in addition to a first capacitive line coupled to one of a pair of bitlines to which voltage may be selectively applied. The capacitive lines provide increased write assistance to the memory device. The second capacitive line structurally lies in a second orientation and is formed in an integrated circuit second metal layer relative to the first capacitive line in some embodiments. The additional capacitive line provides negative bitline assistance by selectively driving its corresponding bitlines to be negative during a write operation.