參數(shù)資料
型號： MB8117400A-50
廠商： Fujitsu Limited
英文描述： CMOS 4 M ×4 BIT Fast Page Mode DRAM(CMOS 4 M ×4位快速頁面存取模式動態(tài)RAM)
中文描述： 的CMOS 4米× 4位快速頁面模式的DRAM（的CMOS 4米× 4位快速頁面存取模式動態(tài)內(nèi)存）
文件頁數(shù)： 21/27頁
文件大小： 304K
代理商： MB8117400A-50
21
MB8117400A-50/MB8117400A-60/MB8117400A-70
HIGH-Z
ROW ADDRESS
“H” or “L”
t
RC
t
RAS
t
ASR
t
RAH
t
RPC
t
RP
t
CRP
t
OH
t
OFF
DESCRIPTION
Refresh of RAM memory cells is accomplished by performing a read, a write, or a read-modify-write cycle at each of 2048 row addresses
every 32-milliseconds. Three refresh modes are available: RAS-only refresh, CAS-before-RAS refresh, and hidden refresh.
RAS-only refresh is performed by keeping RAS Low and CAS High throughout the cycle; the row address to be refreshed is latched on the
falling edge of RAS. During RAS-only refresh, DQ pins are kept in a high-impedance state.
Fig. 12 – RAS–ONLY REFRESH (WE = OE = “H”or“L”)
RAS
V
IH
V
IL
A
0
to A
10
CAS
V
IH
V
IL
V
IH
V
IL
DQ
(Output)
V
OH
V
OL
HIGH-Z
“H” or “L”
DESCRIPTION
CAS-before-RAS refresh is an on-chip refresh capability that eliminates the need for external refresh addresses. If CAS is held Low for the
specified setup time (t
CSR
) before RAS goes Low, the on-chip refresh control clock generators and refresh address counter are enabled. An
internal refresh operation automatically occurs and the refresh address counter is internally incremented in preparation for the next CAS-
before-RAS refresh operation.
Fig. 13 - CAS-BEFORE-RAS REFRESH (ADRESS = OE = “H”or“L”)
RAS
V
IH
V
IL
CAS
V
IH
V
IL
V
IH
V
IL
DQ
(Output)
V
OH
V
OL
WE
t
WSR
t
OH
t
OFF
t
WHR
t
CPN
t
CSR
t
CHR
t
RAS
t
RC
t
RP
t
RPC
相關(guān)PDF資料
PDF描述
MB8117400A-60 CMOS 4 M ×4 BIT Fast Page Mode DRAM(CMOS 4 M ×4位快速頁面存取模式動態(tài)RAM)
MB8117400A-70 CMOS 4 M ×4 BIT Fast Page Mode DRAM(CMOS 4 M ×4位快速頁面存取模式動態(tài)RAM)
MB8117400B-50 4 M ×4 BITS Fast Page Mode Dynamic RAM(CMOS 4 M ×4 位快速頁面存取模式RAM)
MB8117400B-60 4 M ×4 BITS Fast Page Mode Dynamic RAM(CMOS 4 M ×4 位快速頁面存取模式RAM)
MB8117405A-60 CMOS 4M ×4 BIT Hyper Page Mode Dynamic RAM(CMOS 4M ×4 位超級頁面存取模式動態(tài)RAM)
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