公开(公告)号：US3755793A

公开(公告)日：1973-08-28

申请号：US3755793D

申请日：1972-04-13

Applicant: IBM

Inventor： HO I ,  MALEY G ,  HWA N YU

IPC: G11C17/00 ,  G11C7/20 ,  G11C11/35 ,  G11C11/404 ,  G11C17/12 ,  H01L27/108 ,  G11C7/00 ,  G11C11/34 ,  H03K25/02

CPC classification number: G11C17/12 ,  G11C7/20 ,  G11C11/35 ,  G11C11/404 ,  H01L27/108

Abstract: A latent image memory is selectively operable as either a readwrite memory or a read-only memory. The memory comprises an array of cells each preferably consisting of a single active device. A first set of the cells are each adapted to store either one of two binary digits. A second set of the cells are each responsive to a first condition for storing either one of two binary digits and responsive to a second condition for storing only a single predetermined binary digit. Means are provided for selecting either the first condition to render the array operable as a read-write memory, or the second condition to render the array operable as a read-only memory. Each of the cells of the first set preferably comprises a field-effect transistor connected to a capacitor, and each of the cells of the second set preferably comprises a charge-coupled device.

Abstract translation: 潜像存储器可选择性地操作为读写存储器或只读存储器。 存储器包括每个优选由单个有源器件组成的单元阵列。 第一组单元适合于存储两个二进制数字之一。 第二组单元各自响应用于存储两个二进制数字中的一个的第一条件，并响应于仅存储单个预定二进制数字的第二条件。 提供了用于选择第一条件以使得阵列可操作为读写存储器的装置，或者用于使阵列可操作为只读存储器的第二条件。 第一组的每个单元优选地包括连接到电容器的场效应晶体管，并且第二组的每个单元优选地包括电荷耦合器件。