參數(shù)資料
型號(hào)： MB8116165A-70
廠商： Fujitsu Limited
英文描述： CMOS 1M ×16 BIT Hyper Page Mode Dynamic RAM(CMOS 1M ×16 位超級(jí)頁面存取模式動(dòng)態(tài)RAM)
中文描述： 的CMOS 100萬× 16位的超頁模式動(dòng)態(tài)RAM的CMOS（100萬× 16位超級(jí)頁面存取模式動(dòng)態(tài)內(nèi)存）
文件頁數(shù)： 24/30頁
文件大?。?/td> 376K
代理商： MB8116165A-70
24
MB8116165A-60/MB8116165A-70
Fig. 16 – RAS-ONLY REFRESH (WE = OE = “H” or “L”)
DQ
(Output)
RAS
V
IH
V
IL
V
IH
V
IL
V
IH
V
IL
LCAS
or
UCAS
A
0
to A
11
V
OH
V
OL
DESCRIPTION
Refresh of RAM memory cells is accomplished by performing a read, a write, or a read-modify-write cycle at each of 4096 row
addresses every 65.6-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 LCAS and UCAS 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.
t
RC
“H” or ”L”
t
RP
t
ASR
t
RPC
HIGH-Z
t
RAH
t
CRP
t
RAS
t
OFF
ROW ADDRESS
t
CRP
t
OH
Fig. 17 – CAS-BEFORE-RAS REFRESH (ADDRESSES = WE = OE = “H” or “L”)
DQ
(Output)
RAS
V
IH
V
IL
V
IH
V
IL
LCAS
or
UCAS
V
OH
V
OL
DESCRIPTION
CAS-before-RAS refresh is an on-chip refresh capability that eliminates the need for external refresh addresses. If LCAS or UCAS
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.
t
RC
“H” or ”L”
HIGH-Z
t
RAS
t
RPC
t
CPN
t
CSR
t
CHR
t
RP
t
OFF
t
OH
t
CPN
t
CSR
相關(guān)PDF資料
PDF描述
MB8116165B-50 1 M ×16 BIT Hyper Page Mode Dynamic RAM(CMOS 1 M ×16位超級(jí)頁面存取模式動(dòng)態(tài)RAM)
MB8116165B-60 1 M ×16 BIT Hyper Page Mode Dynamic RAM(CMOS 1 M ×16位超級(jí)頁面存取模式動(dòng)態(tài)RAM)
MB8116400A-50 CMOS 4 M ×4 BIT Fast Page Mode DRAM(CMOS 4 M ×4 位快速頁面存取模式動(dòng)態(tài)RAM)
MB8116400A-60 CMOS 4 M ×4 BIT Fast Page Mode DRAM(CMOS 4 M ×4 位快速頁面存取模式動(dòng)態(tài)RAM)
MB8116400A-70 CMOS 4 M ×4 BIT Fast Page Mode DRAM(CMOS 4 M ×4 位快速頁面存取模式動(dòng)態(tài)RAM)
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