STATIC STORES (semiconductor memory devices H10B)

Introduced: September 1968

Description

G11C covers non-volatile and volatile memory devices that retain stored information without requiring mechanical movement or constant refresh cycles. This includes semiconductor memories such as read-only memory (ROM), programmable ROM (PROM), electrically erasable PROM (EEPROM), flash memory, and static random-access memory (SRAM), as well as related storage architectures and access methods. The classification encompasses memory cell designs, addressing schemes, control circuits, and peripheral circuits integral to static memory operation. Adjacent dynamic memory technologies requiring periodic refresh, magnetic storage media, and optical storage systems are classified separately in related G11 subclasses.

Title

Titles differ between systems:

IPC: STATIC STORES

CPC: STATIC STORES (semiconductor memory devices H10B)

Full Title

Full titles differ between systems:

IPC:

STATIC STORES

CPC:

STATIC STORES (semiconductor memory devices H10B)

Of 21 combined children, 16 exist in both systems.

5 codes are CPC-only extensions.

Note: 5 CPC extensions are marked as secondary classification only.

8 shared codes have differing titles between IPC and CPC.

Child Classifications

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G11C 11/00 Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor (G11C14/00 - G11C21/00 take precedence) +1 CPC IPC+CPC Available in IPC and CPC
G11C 13/00 Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 +1 CPC IPC+CPC Available in IPC and CPC
G11C 14/00 Digital stores characterised by arrangements of cells having volatile and non-volatile storage properties for back-up when the power is down since 1990 +2 CPC IPC+CPC Available in IPC and CPC
G11C 15/00 Digital stores in which information comprising one or more characteristic parts is written into the store and in which information is read-out by searching for one or more of these characteristic parts, i.e. associative or content-addressed stores IPC+CPC Available in IPC and CPC
G11C 16/00 Erasable programmable read-only memories (G11C14/00 takes precedence) since 1990 IPC+CPC Available in IPC and CPC
G11C 17/00 Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards +1 CPC IPC+CPC Available in IPC and CPC
G11C 19/00 Digital stores in which the information is moved stepwise, e.g. shift registers +1 CPC IPC+CPC Available in IPC and CPC
G11C 21/00 Digital stores in which the information circulates (stepwise G11C19/00) +1 CPC IPC+CPC Available in IPC and CPC
G11C 2207/00 Indexing scheme relating to arrangements for writing information into, or reading information out from, a digital store 2nd only +8 CPC CPC only CPC only
G11C 2211/00 Indexing scheme relating to digital stores characterized by the use of particular electric or magnetic storage elements; Storage elements therefor 2nd only +2 CPC CPC only CPC only
G11C 2213/00 Indexing scheme relating to G11C13/00 for features not covered by this group 2nd only +4 CPC CPC only CPC only
G11C 2216/00 Indexing scheme relating to G11C16/00 and subgroups, for features not directly covered by these groups 2nd only +2 CPC CPC only CPC only
G11C 2229/00 Indexing scheme relating to checking stores for correct operation, subsequent repair or testing stores during standby or offline operation 2nd only +1 CPC CPC only CPC only
G11C 23/00 Digital stores characterised by movement of mechanical parts to effect storage, e.g. using balls; Storage elements therefor IPC+CPC Available in IPC and CPC
G11C 25/00 Digital stores characterised by the use of flowing media; Storage elements therefor IPC+CPC Available in IPC and CPC
G11C 27/00 Electric analogue stores, e.g. for storing instantaneous values +1 CPC IPC+CPC Available in IPC and CPC
G11C 29/00 Checking stores for correct operation ; Testing stores during standby or offline operation +3 CPC IPC+CPC Available in IPC and CPC
G11C 5/00 Details of stores covered by group G11C11/00 +1 CPC IPC+CPC Available in IPC and CPC
G11C 7/00 Arrangements for writing information into, or reading information out from, a digital store (G11C5/00 takes precedence; auxiliary circuits for stores using semiconductor devices G11C11/4063, G11C11/413) +1 CPC IPC+CPC Available in IPC and CPC
G11C 8/00 Arrangements for selecting an address in a digital store (for stores using transistors G11C11/407, G11C11/413) since 1974 +1 CPC −1 IPC IPC+CPC Available in IPC and CPC